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MultiRBL vs MXToolbox Blacklist Check: catalog facts
MultiRBL	MXToolbox Blacklist Check
Free Free to use, with optional Bitcoin donations.	Free The blacklist check is free to use on the website.
Web	Web
Checks over 200 blacklists and whitelists Supports IPv4 and IPv6	Checks over 100 DNSBLs in one pass Accepts an IP address or a domain
No help with removal requests Plain interface with lots of technical output	Covers fewer lists than some dedicated multi-RBL tools Shows listings but does not remove them
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is 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.