Domain Expiration Tracker — Registrar, Dates & Status

Check registration date, expiration date, days until expiry, registrar, nameservers, and status for a list of domains — via the official RDAP protocol, the modern IANA-standardized successor to WHOIS.

Built for IT teams managing a domain portfolio (catching renewals before they lapse), brand/security teams watching for lapsed-domain takeover risk, and anyone checking whether a domain is available.

Input

{
  "domains": ["google.com", "thisdomaindefinitelydoesnotexist12345xyz.com"]
}

Field	Type	Description
domains	array of strings	Domains to check. Subdomains and URLs work too: shop.example.co.uk or https://www.example.com/about is checked as the registered domain (example.co.uk, example.com). One lookup is billed per entry.

Output

One record per entry:

{
  "input": "google.com",
  "domain": "google.com",
  "registered": true,
  "registrar": "MarkMonitor Inc.",
  "creationDate": "1997-09-15T04:00:00Z",
  "expirationDate": "2028-09-14T04:00:00Z",
  "daysUntilExpiration": 762,
  "lastChangedDate": "2019-09-09T15:39:04Z",
  "statuses": ["client delete prohibited", "client transfer prohibited", "client update prohibited"],
  "nameservers": ["NS1.GOOGLE.COM", "NS2.GOOGLE.COM", "NS3.GOOGLE.COM", "NS4.GOOGLE.COM"],
  "rdapUrl": "https://rdap.verisign.com/com/v1/domain/google.com"
}

An unregistered/available domain returns "registered": false with the other fields null — still billed once, since a completed availability check is the result either way.

input is the entry as you gave it and domain is the registered domain that was looked up, so news.bbc.co.uk comes back with "domain": "bbc.co.uk". The registered domain is worked out from the Public Suffix List.

How it works

Direct calls to the official RDAP protocol: looks up the correct registry server per domain via the IANA RDAP bootstrap registry, then queries it directly. No proxy, no key, no scraping.

Coverage note: RDAP is mandatory for ICANN-accredited gTLDs (.com, .net, .org, .info, .dev, .app, and most others) but optional for ccTLDs — a handful (e.g. .co, .us) don't publish an RDAP server yet and will return a clear error instead of a result.

Pricing note

Billed per domain checked, not per field returned — one charge per domain whether it's registered or available.

Related products

• SSL Certificate Monitor: new TLS certificates issued for a domain, a different signal than registration/expiration