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wtfis vs DNSlytics: catalog facts
wtfis	DNSlytics
Free Free and open source under MIT.	Freemium Free tools on the website; premium website access, monitoring and the API are paid monthly…
Command line	Web
Collects domain, hostname, and IP details in one lookup Combines information from several public data services	Reverse IP, name server and mail server lookups in one place More than ten years of historical DNS data
Lookups depend on external services and their quotas Some data sources require API credentials	Page views and features are limited without a premium plan IP and DNS data is refreshed every 14 days rather than live
Downloadable app	Web application, Hosted service
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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