Alternatives to Who.is
A web lookup for WHOIS, RDAP, DNS records, nameservers and IP ownership of any domain. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Who.is
A web lookup for WHOIS, RDAP, DNS records, nameservers and IP ownership of any domain.
Replacements
Listings that take over the same core job as Who.is.
Whois.com Lookup
A free web lookup for domain and IP registration details such as owner, registrar and expiry.
Whois.com Lookup is free for domain and IP registration details across hundreds of TLDs, but lacks DNS change monitoring and an API.
ICANN Lookup
ICANN's web tool for looking up registration data for domain names and Internet number resources.
ICANN Lookup is run by ICANN using RDAP and covers IP resources, but shows only registration data with no DNS records or monitoring.
DomainTools Whois Lookup
A web-based WHOIS lookup for researching domain ownership, IP address history and domain availability.
DomainTools Whois Lookup adds IP address history, reverse WHOIS and DNS history, but its free tier is limited and history targets paying users.
Whoxy
A WHOIS lookup site and pay-as-you-go API with WHOIS history and reverse WHOIS search.
Whoxy offers WHOIS history and reverse WHOIS through a pay-as-you-go API with no monthly fee, but no DNS lookups or monitoring.
ViewDNS.info
A web collection of more than 20 DNS, IP and domain lookup tools, with a paid API.
ViewDNS.info collects more than 20 DNS, WHOIS and IP tools including IP history and reverse WHOIS, with a paid API.
Also worth comparing
These listings name Who.is as their own alternative, so the relationship runs both ways.
DNSChecker
A web tool that checks DNS propagation by querying public resolvers in many countries.
Who.is combines DNS record lookups with WHOIS, RDAP and IP ownership, plus optional paid monitoring for DNS changes, without a global propagation map.
Google Admin Toolbox Dig
Google's free web-based DNS lookup tool that queries a domain's records and shows the results.
Who.is combines DNS record lookups with WHOIS, RDAP and IP ownership, and adds optional paid monitoring for DNS changes and certificate expiry.
Robtex
A free lookup service for domains, IP addresses, AS numbers and reputation data.
Who.is combines WHOIS, RDAP, DNS and IP ownership lookups with optional paid monitoring for DNS changes and certificate expiry.
TrackSSL
A hosted service that monitors SSL/TLS certificates and sends alerts before they expire or change.
Who.is offers optional premium monitoring for certificate expiry and DNS changes, mainly as an add-on to its WHOIS, RDAP and DNS lookup site.
Similar software
Related functionality, not a direct replacement.
intoDNS
A free web tool that checks a domain's DNS and mail server health and configuration.
DNSsy
A free website that tests a domain's DNS health and offers live DNS, reverse, WHOIS and ping lookups.
Netcraft Site Report
A free web lookup that shows the hosting, server software and technologies behind any website.
crt.sh
A free web search engine for certificates recorded in public Certificate Transparency logs.
