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, without protocol or "www.". One lookup is billed per domain.

Output

One record per domain:

{
  "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.

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

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