Whois Lookup
Check who owns a domain, IP range, or ASN — registration dates, registrar, DNS servers and status in one structured report
Why people choose us
RDAP — the modern registry protocol
Every lookup goes straight to the registry's own RDAP server — structured, machine-readable registration data with no scraping or guesswork.
Domain, IP & ASN in one box
Paste a domain, IPv4, IPv6, or autonomous system number — the type is detected automatically and routed to the right registry.
Cached & rate-limited
Results are cached so repeated lookups never hammer registry servers, and per-visitor limits keep the tool open and fast for everyone.
Frequently asked questions
What does a Whois lookup tell me?⌄
It returns the public registration record of a domain, IP address, or ASN: the registrar, creation and expiry dates, status flags, name servers, DNSSEC, and the owning organization. It tells you who administers a network or which registrar holds a domain — never passwords or private contact details, which registries redact for privacy.
Why are some contact fields shown as withheld?⌄
Under GDPR and similar privacy laws, most registries stop publishing registrant names, emails and phone numbers. When a registry redacts a field, this tool labels it as withheld for privacy instead of showing a blank — an empty field would look like a lookup failure, and it isn't one.
Is this the same as the old WHOIS?⌄
Almost every TLD now publishes via RDAP, the modern successor to WHOIS: structured JSON served over HTTPS instead of free text over a raw TCP port, so fields are consistent across registries. This tool uses RDAP only; a TLD that hasn't adopted it yet is reported as unsupported rather than guessed at.
Related tools
What is a Whois lookup?
Every domain, IP range, and autonomous system number has a public registration record — who registered it, through which registrar, when it was created and when it expires. This lookup queries the registry's own RDAP servers directly and presents that record as a structured report: registrar, dates, status codes explained in plain language, name servers, DNSSEC, and the owning organizations. No scraping, no third-party middleman, no signup — it is the same data registrars and network operators use when investigating domain ownership, planning renewals, or tracing who operates a network. The lookup is free and instant: nothing is uploaded or stored, and results are cached briefly so checking the same name twice is fast and polite to the registries.
What this tool shows
- Registrar, creation, expiry and last-updated dates, plus status codes with plain-language explanations
- Name servers and DNSSEC status for the domain
- The registrable domain — subdomains are stripped, so sub.example.co.uk is reported as example.co.uk
- For IP addresses and ASNs: owning registry, announced prefixes, address range and the organization behind them
- The original RDAP JSON is one click away for verification
When to use it
- Before buying a domain — check when the current registration expires
- To find out who operates a network or hosts a service
- Before transferring a domain, to confirm it is not locked by a transfer prohibition
- When mail or a site breaks, to check the DNSSEC and name-server configuration
Privacy note: under GDPR and similar regulations, registries redact most registrant contact details. Fields withheld for privacy are marked as such instead of shown blank — the record you see is exactly the same public data registrars see, no more.