Is your IP or domain on a blacklist?

Check 25+ public email blacklists — Spamhaus, Barracuda, SpamCop, SORBS, UCEPROTECT and more — in seconds. No signup, no captcha. We don't save your input or who looked it up.

DNS-based block lists, parallel-queried

Every list publishes a DNS zone where listed IPs return an A record. We reverse your IP, query each zone in parallel, and aggregate the answers. Total time is usually under 2 seconds.

A clean result is reassuring but not a guarantee — recipient mail servers also use private blocklists, reputation scores, and content filters. If you ship cold email, MailCull's verify-list workflow catches the typo / disposable / dead-mailbox cases that put you on these lists in the first place.