Free domain tools
Fast, free, no-signup lookups for domains and websites. Run a check, then let Domnr keep watching it for you.
WHOIS Lookup
Look up WHOIS registration data for any domain — registrar, creation and expiry dates, nameservers, and status.
Domain Availability Checker
Check whether a domain name is available to register or already taken.
Domain Age Checker
Find out how old a domain is, based on its WHOIS creation date.
Domain Expiration Checker
See when a domain registration expires so you never miss a renewal.
DNS Lookup
Look up A, AAAA, MX, TXT, NS, CNAME, and SOA DNS records for any domain.
SSL Certificate Checker
Check a domain’s SSL/TLS certificate — issuer, validity dates, and days until expiry.
DNS Propagation Checker
Check whether a DNS change has propagated by resolving a domain across public resolvers.
Nameserver Lookup
Find the authoritative nameservers (NS records) for any domain.
Domain Health Checker
A quick health check of a domain’s DNS, SSL, and registration expiry.
HTTP Header Checker
Inspect the HTTP response headers a URL returns — security headers, caching, server, and more.
HTTP Status Code Checker
Check the HTTP status code a URL returns, following redirects.