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DNSDumpster vs Robtex: catalog facts
DNSDumpster	Robtex
Free Free to use in the browser.	Free Lookups are free on the website.
Web	Web
Nothing to install Quick overview of a domain's visible hosts	Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs
Intended for authorized testing and checking your own domains Results depend on publicly available DNS data	Web service only Research shows lookups rather than any monitoring or alerting
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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