Whois Lookup

Central Ops provides online network tools including traceroute, nslookup, and WHOIS, with a related WHOIS API.

Central Ops offers network diagnostic tools including traceroute, nslookup, and WHOIS lookups.

Whoxy provides a WHOIS API for looking up domain registration records from a database of historical records.

IPVoid provides IP, network, and DNS utilities, including blacklist checks, WHOIS lookups, and ping tools.

DomainTools provides WHOIS lookups, domain availability searches, IP history, traffic data, and other domain research information.

Domain Digger looks up DNS, WHOIS, IP data, SSL history, and subdomains for a domain.