--- title: "WHOIS Lookup" description: "Look up domain registration details including registrar, creation date, expiry date, nameservers, and DNSSEC status using the public RDAP protocol." url: https://findutils.com/network/whois-lookup/ category: network --- # WHOIS Lookup Look up domain registration details including registrar, creation date, expiry date, nameservers, and DNSSEC status using the public RDAP protocol. **Use this tool:** [WHOIS Lookup](https://findutils.com/network/whois-lookup/) ## Programmatic access - REST id `whois-lookup`: POST https://api.findutils.com/api/tools/whois-lookup/execute (reference: https://findutils.com/api/whois-lookup/) - MCP tool `whois_lookup` on https://mcp.findutils.com (reference: https://findutils.com/mcp/whois-lookup/) ## Why Use WHOIS Lookup? WHOIS lookup is a fundamental tool for security researchers, system administrators, and domain investors. It reveals who owns a domain, when it was registered, when it expires, and which nameservers it uses. This information is crucial for investigating suspicious domains, verifying business legitimacy, planning domain acquisitions, and troubleshooting DNS issues. Our tool uses the modern RDAP protocol, which provides structured, machine-readable data and is replacing the legacy WHOIS text protocol. ## Tips for Effective WHOIS Lookups - Always query the bare domain (example.com) rather than subdomains (www.example.com) -- WHOIS data is registered at the domain level, not the subdomain level. - If WHOIS results show 'REDACTED FOR PRIVACY,' the registrant is using a privacy protection service. This is normal and increasingly common due to GDPR requirements. - Check the expiry date regularly for domains you own to avoid accidental lapses. Set calendar reminders at least 30 days before expiration. - Compare the nameservers shown in WHOIS with the NS records from a DNS lookup to ensure they match. Mismatches can indicate an incomplete DNS migration. - Use WHOIS alongside the SSL Certificate Checker to verify that a domain's certificate is issued to the correct organization and has not expired. ## Frequently Asked Questions ### What is WHOIS? WHOIS is a protocol for querying databases that store registration information about domain names and IP addresses. It shows who registered a domain, when it was created, when it expires, and the technical details like nameservers. RDAP is the modern replacement for WHOIS, providing structured JSON responses. ### Why is some WHOIS data hidden? Many domain registrars offer privacy protection services that replace the registrant's personal information with proxy details. Additionally, GDPR regulations require registrars to redact personal data for European registrants. This is why you may see 'REDACTED FOR PRIVACY' in some fields. ### What do domain status codes mean? Domain status codes indicate the current state of a domain. Common statuses include: clientTransferProhibited (transfer locked by registrar), serverDeleteProhibited (deletion locked by registry), active (domain is live and resolving), and pendingDelete (domain is being deleted). ### What is DNSSEC? DNSSEC (Domain Name System Security Extensions) adds cryptographic signatures to DNS records to prevent DNS spoofing attacks. When DNSSEC is 'Signed', it means the domain's DNS responses can be verified for authenticity, protecting users from being redirected to malicious sites. ### Does WHOIS work for all domain extensions? Most common TLDs (.com.net.org, country codes) support WHOIS/RDAP queries. However, some newer or country-specific TLDs may have limited RDAP support. If a lookup fails, the TLD's registry may not provide RDAP access. ### Does this WHOIS lookup tool require a signup? No. FindUtils WHOIS Lookup works with no signup, no usage limits. You can query unlimited domains without any restrictions. The tool uses the public RDAP protocol, which is freely accessible. ### What is the difference between WHOIS and RDAP? WHOIS is the legacy protocol that returns unstructured plain text, with formatting that varies by registrar. RDAP (Registration Data Access Protocol) is the modern replacement that returns standardized JSON data, supports HTTPS for secure transport, and includes built-in access control. FindUtils uses RDAP for more reliable and consistent results. ### How can I find out when a domain expires? Enter the domain name and run a lookup. The Expiry Date field shows when the domain registration is set to expire. If the registrant does not renew before this date, the domain enters a grace period and eventually becomes available for re-registration. ### Can I find the owner of a domain with WHOIS? Historically, WHOIS showed registrant contact details including name, email, and address. However, since GDPR took effect in 2018, most registrars redact personal information. You will typically see the registrar name, registration dates, and technical data, but not the registrant's personal identity. ### Is my WHOIS query data private? Mostly. Queries go directly from your browser to rdap.org, which forwards them to the registry or registrar RDAP server for that domain, so those operators see the domain name you look up, as with any WHOIS client. Nothing passes through FindUtils servers, and FindUtils does not log, store, or track the domains you query. ## Related Tools - [DNS Lookup](https://findutils.com/network/dns-lookup/) - [SSL Certificate Checker](https://findutils.com/network/ssl-certificate-checker/) - [DNS Security Scanner](https://findutils.com/network/dns-security-scanner/) - [IP Address Lookup](https://findutils.com/network/ip-address-lookup/) - [Email Security Checker](https://findutils.com/security/email-security-checker/) - [Security Headers Analyzer](https://findutils.com/network/security-headers-analyzer/) - [URL Safety Checker](https://findutils.com/security/url-safety-checker/) - [Email Validator](https://findutils.com/security/email-validator/)