Domain WHOIS API: Get Registration, Expiry and Ownership Data in One Call

#api #whois #domain #devtools

Domain WHOIS data is essential for many workflows: checking domain expiry before renewal, detecting ownership changes, finding nameservers, or monitoring competitor domains.

Most WHOIS lookups require command-line tools, manual queries, or expensive services. I built Domain WHOIS Lookup API — a simple REST endpoint that returns structured WHOIS data for any domain.

What it returns

Single POST request gives you:

Registrar — who registered the domain
Creation date — when the domain was registered
Expiry date — when it expires (with days-until-expiry counter)
Updated date — last update timestamp
Nameservers — DNS servers pointing to domain's host
Country — registrant country
IP address — resolved IP of the domain
Status codes — registration status (locked, active, etc)
Organization — registrant organization name

Quick start

Python

import requests

url = "https://domain-whois-lookup.p.rapidapi.com/whois"
headers = {
    "X-RapidAPI-Key": "YOUR_KEY",
    "Content-Type": "application/json"
}
payload = {"domain": "github.com"}

r = requests.post(url, json=payload, headers=headers)
print(r.json())

Response:

{
  "domain": "github.com",
  "registrar": "MarkMonitor, Inc.",
  "creation_date": "2007-10-09T18:20:50+00:00",
  "expiration_date": "2026-10-09T18:20:50+00:00",
  "days_until_expiry": 158,
  "name_servers": ["ns-1234.awsdns-12.com", ...],
  "country": "US",
  "org": "GitHub, Inc.",
  "ip_address": "140.82.113.4",
  "is_expired": false
}

JavaScript

const response = await fetch("https://domain-whois-lookup.p.rapidapi.com/whois", {
  method: "POST",
  headers: {
    "X-RapidAPI-Key": "YOUR_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({ domain: "example.com" })
});
const data = await response.json();
console.log(`Domain expires in ${data.days_until_expiry} days`);

Use cases

Domain monitoring — track expiry dates for your portfolio
OSINT — research domain ownership and nameserver changes
Competitor analysis — monitor when competitors renew domains
Bulk audits — check 100s of domains for expiry or status changes
Infrastructure audits — verify nameserver configs automatically
Security — detect domain hijacking (sudden IP/nameserver changes)

Real example

Monitor your company domains and get alerted before expiry:

import requests
from datetime import datetime

domains = ["mycompany.com", "myproduct.io", "backup.net"]

for domain in domains:
    r = requests.post(url, json={"domain": domain}, headers=headers)
    data = r.json()

    if data["days_until_expiry"] < 30:
        print(f"⚠️ {domain} expires in {data['days_until_expiry']} days!")
    else:
        print(f"✓ {domain} - {data['days_until_expiry']} days remaining")