WHOIS Lookup

Lookup domain registration metadata — registrar, dates, name servers, and expiry status.

Run a lookup to see WHOIS results.
—Registrar
—Domain Age
—Expires
0Statuses

What is WHOIS Lookup?

WHOIS is a public protocol that reveals who registered a domain, when it was created, when it expires, and which registrar manages it. This tool queries modern RDAP (Registration Data Access Protocol) sources—the structured successor to classic WHOIS—and presents results in an easy-to-read format. You get registrar details, creation and expiration dates, name servers, EPP status codes, and registrant contact (when not privacy-protected).

Real-world use cases include checking domain availability, verifying registration before a purchase, auditing domain age for SEO, investigating ownership for legal or brand protection, and confirming nameservers before a migration. Domain investors, legal teams, and SEOs use it regularly.

How to Use WHOIS Lookup

  1. Enter a domain name (e.g., example.com) in the Domain field. Do not include http:// or www.
  2. Click Lookup or press Ctrl+Enter. The tool queries RDAP and returns structured data.
  3. View the results: Registrar, Domain Age, Expiration date, and Status count in the stat grid. Detailed tables show registration dates, registrar info, name servers, and EPP statuses.
  4. Switch to Raw view for the full JSON. Use Copy or Save to export.
  5. Expiration dates are color-coded: red for expired or expiring soon, yellow for within 90 days.

Tips & Best Practices

Registrant info is often redacted when WHOIS privacy is enabled. Domain statuses like clientTransferProhibited mean the domain is locked against transfers. For definitive availability checks, use a registrar's search tool. Use Ctrl+Shift+C to copy and Esc to clear. For DNS records, try our DNS Lookup. For your own IP, use What's My IP.

When to Use This Tool

Use the WHOIS Lookup when checking domain registration, expiration, or ownership. Pair it with the DNS Lookup for resolution details, or the What's My IP tool to check your connection.

Frequently Asked Questions

What is a WHOIS lookup?

WHOIS is a public protocol that lets you query registration data for a domain name — who registered it, when it was created, when it expires, and which registrar manages it. Modern registries use RDAP, a structured replacement for classic WHOIS.

Why is registrant information hidden?

Many domain owners enable WHOIS privacy protection through their registrar. This replaces personal contact details with a proxy service to reduce spam and protect identity. ICANN allows this under its data protection policies.

What do domain statuses like clientTransferProhibited mean?

Domain statuses are EPP (Extensible Provisioning Protocol) codes that indicate the state of a domain. "clientTransferProhibited" means the registrant has locked the domain to prevent unauthorized transfers. "serverHold" means the registry has suspended resolution.

How accurate is WHOIS data?

WHOIS data comes directly from the registry and registrar databases. Dates and name servers are highly accurate. Contact information may be redacted or proxied for privacy. For the most authoritative data, check the registry's own RDAP endpoint.

Can I use this to check domain availability?

Indirectly — if a WHOIS lookup returns no registration data, the domain may be available. However, for definitive availability checks, use your registrar's search tool. You can also use our DNS Lookup to see if the domain resolves.

Is this tool free?

Yes. WHOIS Lookup on ToolCrux is completely free with no signup required. Results are fetched via RDAP and displayed instantly. Try our other network tools like What's My IP and HTTP Headers Checker.