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SecurityTrails vs Robtex: catalog facts
SecurityTrails	Robtex
Freemium An API key is available on sign-up; larger data services are aimed at security teams.	Free Lookups are free on the website.
Web	Web
Historical DNS and WHOIS records going back years Subdomain and associated domain discovery	Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs
Requires an account to use Oriented towards business security teams rather than casual users	Web service only Research shows lookups rather than any monitoring or alerting
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.