Discovery
Find subdomains
Discover the names behind a domain. Filter the inventory and take it into your investigation.
Subdomain inventory
Tools
Search history
Recent searches
Saved in this browser. Select an entry to fill the search field.
No searches yet.
Brand research
Find lookalike domains
Compare spelling variations with WHOIS observations. Inspect the evidence behind each match.
Matches & registration evidence
Visual search
Find sites by favicon
Start with a site or an icon hash. Find hosts that use the same or a similar icon.
Visual matches & linked hosts
Ownership research
Find an organization’s domains
Follow registration and infrastructure records. Select the domains worth investigating further.
Domains & supporting records
Lookup
Find sites by tracking ID
Follow analytics identifiers between sites. Inspect the shared tag behind each connection.
Tracking IDs & connected sites
Quick lookups
Host lookupHosts & services
IP lookupNetwork & related records
ASN lookupASN & network prefixes
DNS historyRecorded DNS answers
Reverse IP lookupAssociated names
Compare domainsInfrastructure comparison
WHOIS lookupRegistration records
Profundis for AI assistants
Search hosts, DNS records, certificates and WHOIS from your AI assistant with our MCP server.
Requires API access. Tool calls use your Profundis credits.