IP Blacklist Checker
Check an IP against major DNS blacklists: Spamhaus, SpamCop, Barracuda, SORBS, UCEPROTECT.
About this tool
DNS-based blacklists (DNSBLs) catalogue IP addresses observed sending spam or hosting abuse, and receiving mail servers consult them in real time. This tool checks your IP against five widely used lists — Spamhaus ZEN, SpamCop, Barracuda, SORBS and UCEPROTECT — and shows a listed/clean verdict per list.
If your mail server's IP is listed, recipients may reject or junk your messages. Identify and fix the cause first (compromised account, open relay, missing rDNS), then request delisting via each blacklist's own removal process.
Frequently asked questions
My IP is listed — how do I get removed?
First fix the root cause, or you will be relisted quickly. Then visit the blacklist's website (e.g. spamhaus.org, spamcop.net) and follow its delisting procedure. Most lists remove clean IPs within hours to a few days; some, like UCEPROTECT Level 1, expire automatically.
Does a listing on one blacklist matter much?
It depends on the list. Spamhaus is used by most major providers, so a ZEN listing seriously harms deliverability. Smaller or aggressive lists (e.g. UCEPROTECT Level 2/3, which list whole providers) have far less real-world impact.
Why is my brand-new server IP already blacklisted?
Cloud IPs are recycled. The previous tenant may have sent spam from it. Check the listing date, request delisting, and consider asking your provider for a different IP if the address has a long abuse history.