Look up domain registration details - registrar, expiry date, nameservers, and status. Data comes from the RDAP protocol, the modern successor to classic WHOIS.
Enter a domain or IP to look up registration details
WHOIS is a protocol for querying databases that store registered domain names, IP address blocks, and autonomous systems. When you register a domain, the registrar submits your information to a central registry - WHOIS lets anyone look that up. This tool uses RDAP (Registration Data Access Protocol), the modern JSON-based replacement for the classic plain-text WHOIS protocol.
Yes - enter any IPv4 address (e.g. 1.1.1.1) and the tool queries RDAP through the public rdap.org service for the IP block owner. This is useful for identifying which organisation or ISP owns an IP address, finding abuse contact details, and verifying which network a server belongs to. The result shows the organisation name, network handle, CIDR block, country, and abuse email if available.
Active / OK - the domain is registered and functioning normally.
Transfer lock (clientTransferProhibited) - the domain cannot be transferred to another registrar. This is a standard protection that most registrars enable by default to prevent unauthorised transfers.
Delete lock (clientDeleteProhibited) - the domain cannot be accidentally deleted by the registrant. Also standard.
Registry lock (serverTransferProhibited, serverDeleteProhibited) - set by the registry itself, not the registrant. Used for high-value domains (banks, governments) as an additional layer of protection.
Redemption period - the domain has expired and entered a grace period during which the previous owner can recover it. After this period it becomes available to anyone.
Pending deletion - the domain is about to be dropped from the registry and become available for registration.
Most domain registrars now offer WHOIS privacy protection, which replaces personal contact details with a proxy service address. This became standard after GDPR came into force in 2018. Corporate registrations (banks, major tech companies) often still show organisation names.
Classic WHOIS (port 43) returns unstructured plain text - every registry formats it differently and automation is fragile. RDAP returns structured JSON with standardised field names, supports internationalised domain names, and is the ICANN-mandated replacement. Most TLDs support RDAP today: the tool asks the registry's own RDAP server, found through IANA's list, or the public rdap.org service when the registry is not listed. For .co, .us and .jp, which have no RDAP, VLANlab's server asks the registry's classic WHOIS server (port 43) instead, which gives the expiry date only. A small number of other older ccTLDs may return a "not found" result here.