DEV Community: WhoisJson

How I handle bulk WHOIS lookups at scale: lessons from running a domain API

WhoisJson — Mon, 27 Apr 2026 10:08:38 +0000

I've been running a WHOIS API since 2016. For a long time, most users were doing one-off lookups, maybe a few hundred a day. Then at some point customers started showing up with different needs entirely. Threat intel pipelines, domain portfolio audits, registrant enrichment at scale. One customer hit 30 million requests in a single month.
That's a different problem from building a WHOIS wrapper. And most of the articles I found when dealing with it were either too basic or skipped the parts that actually bite you in production.
So here's what I've learned.

Rate limits are the easy part

The obvious problem is staying under your API rate limit. 429, back off, retry. Everyone knows this. But with WHOIS specifically there's a second layer: the upstream registries themselves. Hit certain ccTLDs too aggressively and you get silent failures, not clean errors. No 429, just empty responses or stale data that looks valid.
I ran into this with .nu and .gr. Both would return what looked like a successful response, but the data was either missing fields or inconsistent between calls on the same domain. It took a while to realize the issue wasn't my code, it was the registry throttling upstream quietly.
The fix is treating unexpected empty fields as a soft error worth retrying, not just HTTP errors.

Node.js: paced sequential

For most jobs under 100k domains, sequential with proper pacing is boring and reliable:

const API_KEY = 'YOUR_API_KEY';
const RATE_LIMIT = 60; // req/min, adjust to your plan

const sleep = (ms) => new Promise(r => setTimeout(r, ms));

async function whoisLookup(domain, retries = 3) {
  const url = `https://whoisjson.com/api/v1/whois?domain=${encodeURIComponent(domain)}`;

  for (let attempt = 1; attempt <= retries; attempt++) {
    const res = await fetch(url, {
      headers: { Authorization: `TOKEN=${API_KEY}` }
    });

    if (res.status === 429) {
      await sleep(2 ** attempt * 1000);
      continue;
    }

    if (!res.ok) throw new Error(`HTTP ${res.status} for ${domain}`);
    return res.json();
  }

  throw new Error(`${domain}: exceeded retry limit`);
}

async function bulkWhois(domains) {
  const results = [];
  const interval = 60_000 / RATE_LIMIT;

  for (const domain of domains) {
    const t0 = Date.now();

    try {
      const data = await whoisLookup(domain);
      results.push({ domain, ok: true, data });
    } catch (err) {
      results.push({ domain, ok: false, error: err.message });
    }

    const elapsed = Date.now() - t0;
    if (elapsed < interval) await sleep(interval - elapsed);
  }

  return results;
}

One thing most examples get wrong: they sleep a fixed interval regardless of how long the request took. If your interval is 1000ms and the lookup took 800ms, sleep 200ms, not 1000ms. On a 50k domain list that difference is 30+ minutes of wasted time.

Node.js: parallel with p-limit

When you need more throughput, controlled parallelism with p-limit works well. I've found concurrency 5 to be a good default on most plans. Going higher adds queuing overhead without proportional speed gains.

import pLimit from 'p-limit';

const limit = pLimit(5);

async function bulkWhoisParallel(domains) {
  const tasks = domains.map(domain =>
    limit(() => whoisLookup(domain))
  );

  const results = await Promise.allSettled(tasks);

  return results.map((r, i) => ({
    domain: domains[i],
    ok: r.status === 'fulfilled',
    data: r.status === 'fulfilled' ? r.value : null,
    error: r.status === 'rejected' ? r.reason.message : null,
  }));
}

Python: ThreadPoolExecutor

import time
import requests
from concurrent.futures import ThreadPoolExecutor, as_completed

API_KEY = 'YOUR_API_KEY'
MAX_WORKERS = 5
RATE_LIMIT = 60

session = requests.Session()
session.headers['Authorization'] = f'TOKEN={API_KEY}'

def whois_lookup(domain, retries=3):
    url = f'https://whoisjson.com/api/v1/whois?domain={domain}'

    for attempt in range(1, retries + 1):
        r = session.get(url, timeout=10)

        if r.status_code == 429:
            time.sleep(2 ** attempt)
            continue

        r.raise_for_status()
        return r.json()

    raise RuntimeError(f'{domain}: exceeded retry limit')

def bulk_whois(domains):
    results = []
    interval = 60.0 / RATE_LIMIT

    with ThreadPoolExecutor(max_workers=MAX_WORKERS) as pool:
        futures = {pool.submit(whois_lookup, d): d for d in domains}

        for future in as_completed(futures):
            domain = futures[future]
            try:
                data = future.result()
                results.append({'domain': domain, 'ok': True, 'data': data})
            except Exception as exc:
                results.append({'domain': domain, 'ok': False, 'error': str(exc)})

            time.sleep(interval)

    return results

Use requests.Session(). It reuses the TCP connection across requests and makes a noticeable difference at scale. On large lists I've measured 15-20% reduction in total runtime just from this.

Checkpointing for big runs

Anything over 100k domains should write results incrementally. If your process crashes at domain 80k, you don't want to start over.

import json, os

CHECKPOINT = 'results.jsonl'

def already_done(domain):
    if not os.path.exists(CHECKPOINT):
        return False
    with open(CHECKPOINT) as f:
        return any(json.loads(line)['domain'] == domain for line in f)

def save(result):
    with open(CHECKPOINT, 'a') as f:
        f.write(json.dumps(result) + '\n')

Then in your main loop, skip domains that are already in the file. JSONL works better than JSON here because you can append without reading the whole file.

Picking a plan

If you're processing under 5k domains per day, Pro at $10/mo covers it. For daily sweeps in the 50k-500k range, Ultra or Scale. Above that, the unlimited plans make more sense financially since you're paying per rate limit rather than per request.
The full API is at whoisjson.com if you want to try it. Free tier is 1k requests/month, no card needed.

One thing I'd do differently if I started over: build the checkpointing in from day one instead of adding it after the first crash. It's 10 lines of code and it's saved me multiple times. WHOIS pipelines run long enough that something will always go wrong halfway through.

Get WHOIS Data Easily with WhoisJSON – A Simple JSON API for Developers

WhoisJson — Tue, 08 Apr 2025 10:15:41 +0000

When you're building tools that require domain name data — whether it's for cybersecurity, domain monitoring, or building your own whois lookup tool — the biggest hurdle is always parsing raw WHOIS data.

Most whois responses are messy, inconsistent, and hard to automate.

That’s why I built WhoisJSON.com — a simple REST API that gives you clean, structured WHOIS data in JSON. It's designed for developers who want fast, reliable access to domain ownership data without the headache.

Why WhoisJSON?

Here’s what makes WhoisJSON stand out:

📦 Structured JSON output – No more regex parsing!
⚡️ Fast & lightweight – Low-latency responses
🌍 Covers generic and country-code TLDs – From .com to .io and .fr
💳 Free plan available – Ideal for testing and side projects
🛠️ Built for automation – Perfect for scripts, bots, and security tools

🧑‍💻 Example: Lookup a domain in seconds

import requests

url = "https://whoisjson.com/api/v1/whois"

querystring = {"domain":"whoisjson.com"}

headers = {
    "Authorization": "Token=<YOUR API KEY>"
}

response = requests.request("GET", url, headers=headers, params=querystring)

print(response.text)

And you get:

{
  "server": "gamma",
  "name": "whoisjson.com",
  "idnName": "whoisjson.com",
  "status": [
    "clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited",
    "clientTransferProhibited https://icann.org/epp#clientTransferProhibited"
  ],
  "nameserver": [
    "dns200.anycast.me",
    "ns200.anycast.me"
  ],
  "ips": "94.23.35.47",
  "created": "2016-12-01 10:28:12",
  "changed": "2024-12-02 08:11:20",
  "expires": "2025-12-01 10:28:12",
  "registered": true,
  "dnssec": "signedDelegation",
  "whoisserver": "whois.ovh.com",
  "contacts": {
    "owner": [
      {
        "handle": null,
        "type": null,
        "name": "REDACTED FOR PRIVACY",
        "organization": null,
        "email": "REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/",
        "address": "REDACTED FOR PRIVACY",
        "zipcode": "REDACTED FOR PRIVACY",
        "city": "REDACTED FOR PRIVACY",
        "state": null,
        "country": "FR",
        "phone": "REDACTED FOR PRIVACY",
        "fax": "REDACTED FOR PRIVACY",
        "created": null,
        "changed": null
      }
    ],
    "admin": [
      {
        "handle": null,
        "type": null,
        "name": "REDACTED FOR PRIVACY",
        "organization": "REDACTED FOR PRIVACY",
        "email": "REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/",
        "address": "REDACTED FOR PRIVACY",
        "zipcode": "REDACTED FOR PRIVACY",
        "city": "REDACTED FOR PRIVACY",
        "state": "REDACTED FOR PRIVACY",
        "country": "REDACTED FOR PRIVACY",
        "phone": "REDACTED FOR PRIVACY",
        "fax": "REDACTED FOR PRIVACY",
        "created": null,
        "changed": null
      }
    ],
    "tech": [
      {
        "handle": null,
        "type": null,
        "name": "REDACTED FOR PRIVACY",
        "organization": "REDACTED FOR PRIVACY",
        "email": "REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/",
        "address": "REDACTED FOR PRIVACY",
        "zipcode": "REDACTED FOR PRIVACY",
        "city": "REDACTED FOR PRIVACY",
        "state": "REDACTED FOR PRIVACY",
        "country": "REDACTED FOR PRIVACY",
        "phone": "REDACTED FOR PRIVACY",
        "fax": "REDACTED FOR PRIVACY",
        "created": null,
        "changed": null
      }
    ]
  },
  "registrar": {
    "id": "433",
    "name": "OVH, SAS",
    "email": "abuse@ovh.net",
    "url": "https://www.ovh.com",
    "phone": "+33.972101007"
  },
  "rawdata": [
    ".verisign-grs.com\u0000+   Domain Name: WHOISJSON.COM\n   Registry Domain ID: 2078340015_DOMAIN_COM-VRSN\n   Registrar WHOIS Server: whois.ovh.com\n   Registrar URL: http://www.ovh.com\n   Updated Date: 2024-12-02T08:11:20Z\n   Creation Date: 2016-12-01T10:28:12Z\n   Registry Expiry Date: 2025-12-01T10:28:12Z\n   Registrar: OVH sas\n   Registrar IANA ID: 433\n   Registrar Abuse Contact Email: abuse@ovh.net\n   Registrar Abuse Contact Phone: +33.972101007\n   Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited\n   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited\n   Name Server: DNS200.ANYCAST.ME\n   Name Server: NS200.ANYCAST.ME\n   DNSSEC: signedDelegation\n   DNSSEC DS Data: 6545 8 2 F7D830DCCE89FB22487066C4438B156BA453A938D46898D1ADF3443F9285CEE1\n   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/\n>>> Last update of whois database: 2025-04-06T05:35:30Z <<<\n\nFor more information on Whois status codes, please visit https://icann.org/epp\n\nNOTICE: The expiration date displayed in this record is the date the\nregistrar's sponsorship of the domain name registration in the registry is\ncurrently set to expire. This date does not necessarily reflect the expiration\ndate of the domain name registrant's agreement with the sponsoring\nregistrar.  Users may consult the sponsoring registrar's Whois database to\nview the registrar's reported date of expiration for this registration.\n\nTERMS OF USE: You are not authorized to access or query our Whois\ndatabase through the use of electronic processes that are high-volume and\nautomated except as reasonably necessary to register domain names or\nmodify existing registrations; the Data in VeriSign Global Registry\nServices' (\"VeriSign\") Whois database is provided by VeriSign for\ninformation purposes only, and to assist persons in obtaining information\nabout or related to a domain name registration record. VeriSign does not\nguarantee its accuracy. By submitting a Whois query, you agree to abide\nby the following terms of use: You agree that you may use this Data only\nfor lawful purposes and that under no circumstances will you use this Data\nto: (1) allow, enable, or otherwise support the transmission of mass\nunsolicited, commercial advertising or solicitations via e-mail, telephone,\nor facsimile; or (2) enable high volume, automated, electronic processes\nthat apply to VeriSign (or its computer systems). The compilation,\nrepackaging, dissemination or other use of this Data is expressly\nprohibited without the prior written consent of VeriSign. You agree not to\nuse electronic processes that are automated and high-volume to access or\nquery the Whois database except as reasonably necessary to register\ndomain names or modify existing registrations. VeriSign reserves the right\nto restrict your access to the Whois database in its sole discretion to ensure\noperational stability.  VeriSign may restrict or terminate your access to the\nWhois database for failure to abide by these terms of use. VeriSign\nreserves the right to modify these terms at any time.\n\nThe Registry database contains ONLY .COM, .NET, .EDU domains and\nRegistrars.\n",
    ".ovh.com\u0000+Domain Name: whoisjson.com\nRegistry Domain ID: 2078340015_DOMAIN_COM-VRSN\nRegistrar WHOIS Server: whois.ovh.com\nRegistrar URL: https://www.ovh.com\nUpdated Date: 2024-12-02T08:11:20Z\nCreation Date: 2016-12-01T10:28:12Z\nRegistrar Registration Expiration Date: 2025-12-01T11:28:12+01:00\nRegistrar: OVH, SAS\nRegistrar IANA ID: 433\nRegistrar Abuse Contact Email: abuse@ovh.net\nRegistrar Abuse Contact Phone: +33.972101007\nDomain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited\nDomain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited\nRegistry Registrant ID: \nRegistrant Name: REDACTED FOR PRIVACY\nRegistrant Organization: \nRegistrant Street: REDACTED FOR PRIVACY\nRegistrant City: REDACTED FOR PRIVACY\nRegistrant State/Province: \nRegistrant Postal Code: REDACTED FOR PRIVACY\nRegistrant Country: FR\nRegistrant Phone: REDACTED FOR PRIVACY\nRegistrant Phone Ext: REDACTED FOR PRIVACY\nRegistrant Fax: REDACTED FOR PRIVACY\nRegistrant Fax Ext: REDACTED FOR PRIVACY\nRegistrant Email: REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/\nRegistry Admin ID: \nAdmin Name: REDACTED FOR PRIVACY\nAdmin Organization: REDACTED FOR PRIVACY\nAdmin Street: REDACTED FOR PRIVACY\nAdmin City: REDACTED FOR PRIVACY\nAdmin State/Province: REDACTED FOR PRIVACY\nAdmin Postal Code: REDACTED FOR PRIVACY\nAdmin Country: REDACTED FOR PRIVACY\nAdmin Phone: REDACTED FOR PRIVACY\nAdmin Phone Ext: REDACTED FOR PRIVACY\nAdmin Fax: REDACTED FOR PRIVACY\nAdmin Fax Ext: REDACTED FOR PRIVACY\nAdmin Email: REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/\nRegistry Tech ID: \nTech Name: REDACTED FOR PRIVACY\nTech Organization: REDACTED FOR PRIVACY\nTech Street: REDACTED FOR PRIVACY\nTech City: REDACTED FOR PRIVACY\nTech State/Province: REDACTED FOR PRIVACY\nTech Postal Code: REDACTED FOR PRIVACY\nTech Country: REDACTED FOR PRIVACY\nTech Phone: REDACTED FOR PRIVACY\nTech Phone Ext: REDACTED FOR PRIVACY\nTech Fax: REDACTED FOR PRIVACY\nTech Fax Ext: REDACTED FOR PRIVACY\nTech Email: REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/\nName Server: dns200.anycast.me\nName Server: ns200.anycast.me\nDNSSEC: signedDelegation\nURL of the ICANN WHOIS Data Problem Reporting System:\nhttp://wdprs.internic.net/\n>>> Last update of WHOIS database: 2024-12-02T22:33:53Z <<<\n\nFor more information on Whois status codes, please visit https://icann.org/epp \n\n###############################################################################\n#\n# Welcome to the OVH WHOIS Server.\n#\n# whois server  : whois.ovh.com       check server  : check.ovh.com\n#\n# The data in this Whois is at your disposal  with the aim of supplying you the\n# information only,  that is helping you  in the obtaining  of  the information\n# about  or  related to a domain name registration record.   OVH Sas  make this\n# information available \"as is\", and  do not  guarantee its accuracy.  By using\n# Whois,  you agree that you will use these data  only for  legal  purposes and\n# that,  under no circumstances will you use this data to:  (1) Allow,  enable,\n# or  otherwise  support  the  transmission  of  mass  unsolicited,  commercial\n# advertisement  or  roughly  or  requests  via the  individual mail (courier),\n# the E-mail (SPAM), by telephone or by fax. (2) Enable high volume, automated,\n# electronic  processes  that  apply  to  OVH  Sas   (or its computer systems).\n# The copy,   the compilation,   the re-packaging,   the dissemination   or the\n# other  use  of  the Whois base  is  expressly  forbidden  without  the  prior\n# written consent of  OVH.  Domain  ownership  disputes should be settled using\n# ICANN's Uniform Dispute Resolution Policy: http://www.icann.org/udrp/udrp.htm\n# We reserve the right  to  modify  these  terms  at  any  time.  By submitting\n# this query,  you agree to  abide by these terms.  OVH Sas  reserves the right\n# to  terminate  your  access  to  the  OVH Sas  Whois  database  in  its  sole\n# discretion,   including   without   limitation,   for  excessive  querying of\n# the Whois database  or  for  failure  to  otherwise  abide  by  this  policy.\n#\n# L'outil du Whois  est  à  votre  disposition  dans  le  but  de  vous fournir\n# l'information  seulement,  c'est-à-dire  vous   aider   dans  l'obtention  de\n# l'information  sur ou lié à un  rapport  d'enregistrement  de nom de domaine.\n# OVH Sas rend  cette information disponible  \"comme est,\"  et  ne garanti pas\n# son exactitude. En utilisant  notre outil  Whois, vous  reconnaissez que vous\n# emploierez ces données seulement pour  des buts légaux et ne pas utiliser cet\n# outil dans les buts suivant: (1) la transmission de publicité non sollicitée,\n# commerciale massive ou en gros ou des sollicitations via courrier individuel,\n# le courrier électronique (c'est-à-dire SPAM),  par  téléphone ou par fax. (2)\n# l'utilisation d'un grand volume,  automatisé  des processus électroniques qui\n# soulignent ou chargent ce système de base de données  Whois  vous fournissant\n# cette  information.   La  copie   de  tout  ou  partie,   la compilation,  le\n# re-emballage,  la dissémination ou d'autre utilisation de la base Whois  sont\n# expressément interdits sans consentement écrit antérieur de OVH. Un désaccord\n# sur la possession d'un nom de domaine peut être résolu en suivant la  Uniform\n# Dispute  Resolution  Policy  de  l'ICANN:  http://www.icann.org/udrp/udrp.htm\n# Nous nous  réservons  le  droit  de  modifier  ces  termes  à tout moment. En\n# soumettant une requête au Whois vous consentez à vous soumettre à ces termes.\n\n# local time : 2025-04-06T05:35:39Z\n# gmt time : 2025-04-06T05:35:39Z\n# last modify : 2024-12-02T22:33:53Z\n\n"
  ],
  "network": null,
  "exception": null,
  "parsedContacts": true,
  "ask_whois": "whois.ovh.com",
  "data": {
    "server": "Iota",
    "name": "whoisjson.com",
    "idnName": "whoisjson.com",
    "status": [
      "clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited",
      "clientTransferProhibited https://icann.org/epp#clientTransferProhibited"
    ],
    "nameserver": [
      "dns200.anycast.me",
      "ns200.anycast.me"
    ],
    "ips": "94.23.35.47",
    "created": "2016-12-01 10:28:12",
    "changed": "2024-12-02 08:11:20",
    "expires": "2025-12-01 10:28:12",
    "registered": true,
    "dnssec": "signedDelegation",
    "whoisserver": "whois.ovh.com",
    "contacts": {
      "owner": [
        {
          "handle": null,
          "type": null,
          "name": "REDACTED FOR PRIVACY",
          "organization": null,
          "email": "REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/",
          "address": "REDACTED FOR PRIVACY",
          "zipcode": "REDACTED FOR PRIVACY",
          "city": "REDACTED FOR PRIVACY",
          "state": null,
          "country": "FR",
          "phone": "REDACTED FOR PRIVACY",
          "fax": "REDACTED FOR PRIVACY",
          "created": null,
          "changed": null
        }
      ],
      "admin": [
        {
          "handle": null,
          "type": null,
          "name": "REDACTED FOR PRIVACY",
          "organization": "REDACTED FOR PRIVACY",
          "email": "REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/",
          "address": "REDACTED FOR PRIVACY",
          "zipcode": "REDACTED FOR PRIVACY",
          "city": "REDACTED FOR PRIVACY",
          "state": "REDACTED FOR PRIVACY",
          "country": "REDACTED FOR PRIVACY",
          "phone": "REDACTED FOR PRIVACY",
          "fax": "REDACTED FOR PRIVACY",
          "created": null,
          "changed": null
        }
      ],
      "tech": [
        {
          "handle": null,
          "type": null,
          "name": "REDACTED FOR PRIVACY",
          "organization": "REDACTED FOR PRIVACY",
          "email": "REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/",
          "address": "REDACTED FOR PRIVACY",
          "zipcode": "REDACTED FOR PRIVACY",
          "city": "REDACTED FOR PRIVACY",
          "state": "REDACTED FOR PRIVACY",
          "country": "REDACTED FOR PRIVACY",
          "phone": "REDACTED FOR PRIVACY",
          "fax": "REDACTED FOR PRIVACY",
          "created": null,
          "changed": null
        }
      ]
    },
    "registrar": {
      "id": "433",
      "name": "OVH, SAS",
      "email": "abuse@ovh.net",
      "url": "https://www.ovh.com",
      "phone": "+33.972101007"
    },
    "rawdata": [
      ".verisign-grs.com\u0000+   Domain Name: WHOISJSON.COM\n   Registry Domain ID: 2078340015_DOMAIN_COM-VRSN\n   Registrar WHOIS Server: whois.ovh.com\n   Registrar URL: http://www.ovh.com\n   Updated Date: 2024-12-02T08:11:20Z\n   Creation Date: 2016-12-01T10:28:12Z\n   Registry Expiry Date: 2025-12-01T10:28:12Z\n   Registrar: OVH sas\n   Registrar IANA ID: 433\n   Registrar Abuse Contact Email: abuse@ovh.net\n   Registrar Abuse Contact Phone: +33.972101007\n   Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited\n   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited\n   Name Server: DNS200.ANYCAST.ME\n   Name Server: NS200.ANYCAST.ME\n   DNSSEC: signedDelegation\n   DNSSEC DS Data: 6545 8 2 F7D830DCCE89FB22487066C4438B156BA453A938D46898D1ADF3443F9285CEE1\n   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/\n>>> Last update of whois database: 2025-04-07T19:06:11Z <<<\n\nFor more information on Whois status codes, please visit https://icann.org/epp\n\nNOTICE: The expiration date displayed in this record is the date the\nregistrar's sponsorship of the domain name registration in the registry is\ncurrently set to expire. This date does not necessarily reflect the expiration\ndate of the domain name registrant's agreement with the sponsoring\nregistrar.  Users may consult the sponsoring registrar's Whois database to\nview the registrar's reported date of expiration for this registration.\n\nTERMS OF USE: You are not authorized to access or query our Whois\ndatabase through the use of electronic processes that are high-volume and\nautomated except as reasonably necessary to register domain names or\nmodify existing registrations; the Data in VeriSign Global Registry\nServices' (\"VeriSign\") Whois database is provided by VeriSign for\ninformation purposes only, and to assist persons in obtaining information\nabout or related to a domain name registration record. VeriSign does not\nguarantee its accuracy. By submitting a Whois query, you agree to abide\nby the following terms of use: You agree that you may use this Data only\nfor lawful purposes and that under no circumstances will you use this Data\nto: (1) allow, enable, or otherwise support the transmission of mass\nunsolicited, commercial advertising or solicitations via e-mail, telephone,\nor facsimile; or (2) enable high volume, automated, electronic processes\nthat apply to VeriSign (or its computer systems). The compilation,\nrepackaging, dissemination or other use of this Data is expressly\nprohibited without the prior written consent of VeriSign. You agree not to\nuse electronic processes that are automated and high-volume to access or\nquery the Whois database except as reasonably necessary to register\ndomain names or modify existing registrations. VeriSign reserves the right\nto restrict your access to the Whois database in its sole discretion to ensure\noperational stability.  VeriSign may restrict or terminate your access to the\nWhois database for failure to abide by these terms of use. VeriSign\nreserves the right to modify these terms at any time.\n\nThe Registry database contains ONLY .COM, .NET, .EDU domains and\nRegistrars.\n",
      ".ovh.com\u0000+Domain Name: whoisjson.com\nRegistry Domain ID: 2078340015_DOMAIN_COM-VRSN\nRegistrar WHOIS Server: whois.ovh.com\nRegistrar URL: https://www.ovh.com\nUpdated Date: 2024-12-02T08:11:20Z\nCreation Date: 2016-12-01T10:28:12Z\nRegistrar Registration Expiration Date: 2025-12-01T11:28:12+01:00\nRegistrar: OVH, SAS\nRegistrar IANA ID: 433\nRegistrar Abuse Contact Email: abuse@ovh.net\nRegistrar Abuse Contact Phone: +33.972101007\nDomain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited\nDomain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited\nRegistry Registrant ID: \nRegistrant Name: REDACTED FOR PRIVACY\nRegistrant Organization: \nRegistrant Street: REDACTED FOR PRIVACY\nRegistrant City: REDACTED FOR PRIVACY\nRegistrant State/Province: \nRegistrant Postal Code: REDACTED FOR PRIVACY\nRegistrant Country: FR\nRegistrant Phone: REDACTED FOR PRIVACY\nRegistrant Phone Ext: REDACTED FOR PRIVACY\nRegistrant Fax: REDACTED FOR PRIVACY\nRegistrant Fax Ext: REDACTED FOR PRIVACY\nRegistrant Email: REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/\nRegistry Admin ID: \nAdmin Name: REDACTED FOR PRIVACY\nAdmin Organization: REDACTED FOR PRIVACY\nAdmin Street: REDACTED FOR PRIVACY\nAdmin City: REDACTED FOR PRIVACY\nAdmin State/Province: REDACTED FOR PRIVACY\nAdmin Postal Code: REDACTED FOR PRIVACY\nAdmin Country: REDACTED FOR PRIVACY\nAdmin Phone: REDACTED FOR PRIVACY\nAdmin Phone Ext: REDACTED FOR PRIVACY\nAdmin Fax: REDACTED FOR PRIVACY\nAdmin Fax Ext: REDACTED FOR PRIVACY\nAdmin Email: REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/\nRegistry Tech ID: \nTech Name: REDACTED FOR PRIVACY\nTech Organization: REDACTED FOR PRIVACY\nTech Street: REDACTED FOR PRIVACY\nTech City: REDACTED FOR PRIVACY\nTech State/Province: REDACTED FOR PRIVACY\nTech Postal Code: REDACTED FOR PRIVACY\nTech Country: REDACTED FOR PRIVACY\nTech Phone: REDACTED FOR PRIVACY\nTech Phone Ext: REDACTED FOR PRIVACY\nTech Fax: REDACTED FOR PRIVACY\nTech Fax Ext: REDACTED FOR PRIVACY\nTech Email: REDACTED FOR PRIVACY - Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/\nName Server: dns200.anycast.me\nName Server: ns200.anycast.me\nDNSSEC: signedDelegation\nURL of the ICANN WHOIS Data Problem Reporting System:\nhttp://wdprs.internic.net/\n>>> Last update of WHOIS database: 2024-12-02T22:33:53Z <<<\n\nFor more information on Whois status codes, please visit https://icann.org/epp \n\n###############################################################################\n#\n# Welcome to the OVH WHOIS Server.\n#\n# whois server  : whois.ovh.com       check server  : check.ovh.com\n#\n# The data in this Whois is at your disposal  with the aim of supplying you the\n# information only,  that is helping you  in the obtaining  of  the information\n# about  or  related to a domain name registration record.   OVH Sas  make this\n# information available \"as is\", and  do not  guarantee its accuracy.  By using\n# Whois,  you agree that you will use these data  only for  legal  purposes and\n# that,  under no circumstances will you use this data to:  (1) Allow,  enable,\n# or  otherwise  support  the  transmission  of  mass  unsolicited,  commercial\n# advertisement  or  roughly  or  requests  via the  individual mail (courier),\n# the E-mail (SPAM), by telephone or by fax. (2) Enable high volume, automated,\n# electronic  processes  that  apply  to  OVH  Sas   (or its computer systems).\n# The copy,   the compilation,   the re-packaging,   the dissemination   or the\n# other  use  of  the Whois base  is  expressly  forbidden  without  the  prior\n# written consent of  OVH.  Domain  ownership  disputes should be settled using\n# ICANN's Uniform Dispute Resolution Policy: http://www.icann.org/udrp/udrp.htm\n# We reserve the right  to  modify  these  terms  at  any  time.  By submitting\n# this query,  you agree to  abide by these terms.  OVH Sas  reserves the right\n# to  terminate  your  access  to  the  OVH Sas  Whois  database  in  its  sole\n# discretion,   including   without   limitation,   for  excessive  querying of\n# the Whois database  or  for  failure  to  otherwise  abide  by  this  policy.\n#\n# L'outil du Whois  est  à  votre  disposition  dans  le  but  de  vous fournir\n# l'information  seulement,  c'est-à-dire  vous   aider   dans  l'obtention  de\n# l'information  sur ou lié à un  rapport  d'enregistrement  de nom de domaine.\n# OVH Sas rend  cette information disponible  \"comme est,\"  et  ne garanti pas\n# son exactitude. En utilisant  notre outil  Whois, vous  reconnaissez que vous\n# emploierez ces données seulement pour  des buts légaux et ne pas utiliser cet\n# outil dans les buts suivant: (1) la transmission de publicité non sollicitée,\n# commerciale massive ou en gros ou des sollicitations via courrier individuel,\n# le courrier électronique (c'est-à-dire SPAM),  par  téléphone ou par fax. (2)\n# l'utilisation d'un grand volume,  automatisé  des processus électroniques qui\n# soulignent ou chargent ce système de base de données  Whois  vous fournissant\n# cette  information.   La  copie   de  tout  ou  partie,   la compilation,  le\n# re-emballage,  la dissémination ou d'autre utilisation de la base Whois  sont\n# expressément interdits sans consentement écrit antérieur de OVH. Un désaccord\n# sur la possession d'un nom de domaine peut être résolu en suivant la  Uniform\n# Dispute  Resolution  Policy  de  l'ICANN:  http://www.icann.org/udrp/udrp.htm\n# Nous nous  réservons  le  droit  de  modifier  ces  termes  à tout moment. En\n# soumettant une requête au Whois vous consentez à vous soumettre à ces termes.\n\n# local time : 2025-04-07T19:06:19Z\n# gmt time : 2025-04-07T19:06:19Z\n# last modify : 2024-12-02T22:33:53Z\n\n"
    ],
    "network": null,
    "exception": null,
    "parsedContacts": true,
    "template": {
      "whois.verisign-grs.com": "verisign",
      "whois.ovh.com": "standard"
    },
    "ask_whois": "whois.ovh.com"
  }
}

You can check out full API docs here: https://whoisjson.com/documentation

🔐 Use Cases

🛡️ Cybersecurity: Detect suspicious or newly registered domains
🔍 SEO / Marketing: Track domain changes and ownership
📈 Monitoring tools: Keep an eye on domain expirations or status
💡 Custom dashboards: Easily feed structured WHOIS data into your app

🚀 Get Started in 2 Minutes

Go to WhoisJSON.com
Sign up for a free account
Grab your API key and start making calls

❤️ Feedback welcome

If you try WhoisJSON, I'd love to hear your thoughts! And if you're building something cool with it, drop a link — I’m always curious to see how devs are using the API.

Happy coding! 💻