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Barracuda Reputation Lookup vs MultiRBL: catalog facts
Barracuda Reputation Lookup	MultiRBL
Free Free to use online.	Free Free to use, with optional Bitcoin donations.
Web	Web
Direct check against the list Barracuda firewalls use Removal request form on the same site	Checks over 200 blacklists and whitelists Supports IPv4 and IPv6
Covers only Barracuda's own reputation list Useful mainly for mail server operators	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
No account 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 23, 2026

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