Look up domain and IP registration data with RDAP. Check registrar, dates, nameservers, and network allocations.
A WHOIS lookup shows who a domain is registered through, when it was registered and when it expires, its status and its name servers. For an IP address it shows the network range, the regional internet registry and the organisation it is allocated to. This tool uses RDAP, the structured successor to the old WHOIS protocol, and asks the registry responsible for each domain or IP directly.
Classic WHOIS returns free-form text over port 43, and every registry formats it differently. RDAP (Registration Data Access Protocol) returns the same registration data as structured JSON over HTTPS, with standard field names. Since January 2025, RDAP has been the official source of registration data for generic top-level domains such as .com, .net and .org. Many country-code domains support it too.
example.com, or an IPv4 or IPv6 address. Look up the domain itself rather than a subdomain like www.example.com; registration data exists only for the registered domain.| Status | What it means |
|---|---|
| active | Normal: no restrictions. |
| client transfer prohibited | Registrar lock against unauthorised transfers. Normal and recommended; unlock it at your registrar before transferring. |
| client hold / server hold | The domain is removed from DNS, so websites and email stop working. Often caused by non-payment, unverified registrant details or an abuse report. |
| redemption period | The domain has expired and been deleted by the registrar. The owner can usually still restore it, for a fee. |
| pending delete | The domain is about to be released for anyone to register; it can no longer be restored. |
For an IP address you see the range (CIDR block) it belongs to, the RIR that allocated it (ARIN, RIPE NCC, APNIC, LACNIC or AFRINIC), the organisation holding the block and, where published, its ASN. The holder is often an ISP or hosting company rather than the end user. For approximate location, use the IP Address Lookup.
Run a WHOIS lookup on the domain: the Expires field shows the current registration end date. Registrars often renew automatically shortly before that date, so a recently renewed domain shows a later date.
Since data protection rules such as the GDPR, registries and registrars redact registrant names, addresses and emails by default. The registrar usually offers a contact form that forwards messages to the owner.
Both return domain and IP registration data. WHOIS is an older text protocol with no standard format; RDAP returns structured JSON over HTTPS, supports internationalised data and is now the authoritative source for generic top-level domains.