Domain, DNS & WHOIS

Tools that look up domains, DNS records, certificates and registration history, and that enumerate the subdomains of a domain.

In-depth attack-surface mapping and asset discovery via DNS enumeration and network recon.

Free domain research tool that maps a domain's subdomains and hosts.

Domain intelligence platform with WHOIS history, reverse WHOIS and DNS pivoting for investigating who is behind a domain.

Web diagnostics for DNS, MX, SPF/DKIM/DMARC, blacklist and SMTP checks on a domain or IP.

Historical DNS, WHOIS and subdomain data for domains and IP addresses.

Fast passive subdomain discovery tool that enumerates valid subdomains for a domain.

Collection of free DNS, WHOIS, reverse-IP and network lookup tools.

Pulls a domain's archived URLs from the Wayback Machine and other sources for recon.

WHOIS lookup and reverse-WHOIS history, including registrant-name search.

Searches Certificate Transparency logs to enumerate a domain's certificates and subdomains.

Generates and checks domain permutations to detect typosquatting and phishing lookalikes.