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MXToolbox Blacklist Check vs HetrixTools: catalog facts
MXToolbox Blacklist Check	HetrixTools
Free The blacklist check is free to use on the website.	Freemium Free tier with 15 uptime and 32 blacklist monitors; paid plans add more.
Web	Web
Checks over 100 DNSBLs in one pass Accepts an IP address or a domain	Generous free tier for uptime and blacklist monitoring Checks from up to 12 locations
Covers fewer lists than some dedicated multi-RBL tools Shows listings but does not remove them	Hosted only, with no self-hosted option Requires an account
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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