MultiRBL

MultiRBL queries over 200 DNS-based reputation lists and whitelists simultaneously, showing you whether your IP or domain appears on any of them. It's a free tool that consolidates what would otherwise require dozens of separate lookups, giving you a comprehensive reputation snapshot in seconds.

Perfect for quick blacklist screening or troubleshooting delivery problems when you suspect your IP is listed somewhere. The tool covers major lists like Spamhaus, Barracuda, and SORBS, plus dozens of smaller, specialized lists that some email filters actually check. Whitelists are included too, so you can see if you're on any reputation-boosting lists.