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

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