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SecurityTrails vs DNSlytics: catalog facts
SecurityTrails	DNSlytics
Freemium An API key is available on sign-up; larger data services are aimed at security teams.	Freemium Free tools on the website; premium website access, monitoring and the API are paid monthly…
Web	Web
Historical DNS and WHOIS records going back years Subdomain and associated domain discovery	Reverse IP, name server and mail server lookups in one place More than ten years of historical DNS data
Requires an account to use Oriented towards business security teams rather than casual users	Page views and features are limited without a premium plan IP and DNS data is refreshed every 14 days rather than live
Web application, Hosted service	Web application, Hosted service
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 October 1, 2026

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