Domain Name Information Lookup Search WHOIS, RDAP, DNS, and nameserver information for any domain name Instantly look up registration data, contact details, nameservers, DNS records, and more for any domain name or IP address using WHOIS and RDAP protocols. Registrant, registrar, and registration dates for any domain. Structured registration data via the modern WHOIS successor. A, AAAA, MX, TXT, NS and other records for any domain. Nameserver Lookup See which domains a given nameserver hosts. IP Address Lookup Ownership and network data for any IPv4 or IPv6 address. How much historical WHOIS/RDAP we hold for a domain.

Check whether a website is reachable right now. Browse domain registrars and the domains they manage. Our Premium Services For researchers, investigators, and site owners who need more. Domain History Report The complete historical WHOIS/RDAP record for a single domain — every snapshot, the ownership-change timeline, and registrar history, delivered as a downloadable report. Pro Website Monitoring Watch the domains that matter: uptime, DNS changes, and TLS-certificate expiry, all from one setup. We probe each domain live so you see exactly what we see, then notify you the moment a site goes down, its DNS shifts, or its certificate nears expiry. Up to 10 domains. Parsed WHOIS, normalized RDAP, and DNS and TLS-certificate history for any domain as JSON over HTTPS. Start on the free tier, no card required. WHOIS is a widely used internet protocol to query databases storing information about registered users of domain names, IP addresses, and autonomous systems. It helps you find owner contact details, registration dates, and nameserver information. RDAP (Registration Data Access Protocol) is the modern successor to WHOIS. It provides a standardized, secure, and more structured way to access registration data, often offering richer information and better privacy controls.