WHOIS Lookup
Registration and ownership details for a domain or IP.
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Enter a host above and press Run to start the check.
About the WHOIS Lookup
WHOIS Lookup queries the registration and ownership records for a domain or IP address by connecting to the relevant WHOIS server over port 43. For domains it returns registrar, registration and expiry dates, and status codes; for IP addresses it returns the allocated network range and the responsible organization. It is the standard way to learn who is behind a domain or who owns a block of addresses.
How to use
- Enter a domain name or an IP address to query.
- Submit the request, which connects to the appropriate WHOIS server on port 43.
- Read the raw WHOIS response for registrar, dates, status, and contact details.
Frequently asked questions
- What information does WHOIS return?
- For domains it typically includes the registrar, creation and expiry dates, nameservers, and status. For IPs it returns the network allocation and the owning organization.
- Why are contact details often hidden?
- Many registrars apply privacy protection, and regulations like GDPR cause registries to redact personal data. You may see redacted or proxy contact information instead.
- What is port 43 used for?
- Port 43 is the standard TCP port for the WHOIS protocol, used to query registry and registrar databases for registration data.