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

#api #security #devtools #osint

Most businesses and security teams need domain information — but WHOIS lookups are either slow, outdated, or behind paywalls.

I built Domain WHOIS API — instant access to registration data, expiry dates, nameservers, and IP addresses for any domain.

What it does

Single endpoint: POST /whois

Returns:

Registrar name
Creation date
Expiration date (+ days until expiry)
Last updated date
Domain status (active/expired/locked)
Nameservers
Country
IP address
Registrant organization

Perfect for: domain monitoring, cybersecurity, lead research, brand protection.

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,
  "status": ["clientDeleteProhibited", "clientTransferProhibited"],
  "name_servers": ["ns1.verifydomains.com", "ns2.verifydomains.com"],
  "country": "United States",
  "ip_address": "140.82.114.4"
}

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: "amazon.com" })
});
const data = await response.json();
console.log(data);

Use cases

Domain monitoring — track when domains are about to expire
Brand protection — monitor competitor domains
Security/OSINT — identify domain ownership and registrars
Lead research — find contact info from WHOIS records
Infrastructure mapping — discover nameservers and IPs

Pricing

Plan	Price	Rate limit
BASIC	Free	50 req/hr
PRO	$9.99/mo	1,000 req/hr
ULTRA	$29.99/mo	10,000 req/hr

Try it

Domain WHOIS Lookup on RapidAPI

Free tier available. No credit card required.

Built this because bulk WHOIS checks are expensive, slow, or outdated. This pulls live data and returns it in milliseconds.

Feedback welcome — especially on additional data points you'd like to see.

DEV Community