NETWORK DIAGNOSTICS

WHOIS domain lookup.

Check a domain’s registrar, registration and expiry dates, name servers, status and publicly available WHOIS details.

Related network tools

DNS Lookup

Check DNS records, name servers and mail routing for a domain.

Reverse DNS Lookup

Find PTR hostnames for a public IP address and verify forward DNS matches.

MX RBL Check

Check a domain’s MX server IP addresses against configured real-time blocklist services.

SMTP Server Check

Check a public SMTP server’s response, ESMTP capabilities and relay policy.

Frequently asked questions

Technical context and standards

What can a WHOIS lookup show?

A WHOIS lookup can return public registration information for a domain, such as its registrar, registration dates, status and name servers. The exact fields vary by registry and registrar.

Relevant standard: RFC 3912 — WHOIS Protocol Specification

Why is some WHOIS information hidden?

Registrars and registries may redact personal contact details or publish only limited data under their policies and privacy obligations. A missing field does not necessarily mean that the domain is unregistered.

Relevant standard: RFC 3912 — WHOIS Protocol Specification

Does WHOIS prove who owns a website?

No. WHOIS data is registration information supplied through registry and registrar systems. It does not prove control of a website, its content or the identity of the person operating it.