Every domain on the internet is registered by someone. WHOIS is the public database recording who owns each domain, when it was registered, when it expires, and who the registrar is. Knowing how to read WHOIS data is essential for cybersecurity research, domain purchasing decisions, and understanding the infrastructure behind any website.
What Is WHOIS?
WHOIS is both a protocol and a database. The protocol allows clients to query servers for registration information about domain names and IP address blocks. The database contains registration records submitted when a domain is purchased. WHOIS has existed since the early ARPANET days and remains fundamental to internet transparency.
What WHOIS Data Shows
A typical record contains: registrant name and contact (often privacy-protected), registrar (the company through which the domain was purchased), creation date (when first registered), expiry date (when registration expires), name servers (DNS servers handling the domain), and status codes indicating the domain state.
Privacy Protection in WHOIS
Most registrars offer WHOIS privacy protection — replacing your personal contact information with the registrar's proxy details. After GDPR in 2018, ICANN required registrars to limit public access to personal data, so many records now show limited information for EU registrants.
How to Look Up Any Domain
The Anonymiz WHOIS Lookup queries the database for any domain and displays registration data in a clean readable format — registrar, creation and expiry dates, name servers, and status codes. No account required.
WHOIS Status Codes
clientTransferProhibited — cannot be transferred to another registrar (standard security lock). clientDeleteProhibited — prevents accidental deletion. serverHold — domain suspended, not resolving. pendingDelete — in grace period before deletion, may become available soon.
Frequently Asked Questions
Is WHOIS data always accurate?
Registrants must provide accurate information, but enforcement is inconsistent. Privacy protection adds another layer of obfuscation. Treat WHOIS as a starting point for research, not a definitive source.
Can I look up IP address ownership?
Yes — IP WHOIS queries return which organisation an IP block is allocated to, handled by regional registries: ARIN (North America), RIPE (Europe), APNIC (Asia-Pacific).
