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