Domain and network tools
Free tools for domain availability, DNS records, WHOIS, SSL certificates, email configuration, HTTP headers, and IP addresses.
Domain Lookup
Check registration, DNS, hosting, and SSL for any domain.
Lookup tools
Domain Availability
Check whether a domain name is registered or available for purchase.
WHOIS Lookup
Retrieve registration, registrar, and expiry information for any domain.
Nameserver Lookup
Look up the authoritative nameservers for any domain name.
DNS Dig Lookup
Query DNS records (A, AAAA, MX, TXT, CNAME, and more) the way dig does, right in your browser.
SSL Checker
Check SSL certificate validity and expiration for any domain.
MX & Email Checker
Check whether a domain can receive email: MX records, mail provider, mail server IP addresses and reverse DNS.
SPF & DMARC Checker
Validate SPF records, check include chains, and inspect DMARC policy alignment.
HTTP Headers
Inspect HTTP response headers (security, CORS, caching, compression, and cookies) for any URL or domain.
Geo IP Lookup
Look up ASN and geographic information for any IPv4 or IPv6 address.