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

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