Email Blacklist Checker
Check if an IP address is listed on 25+ major email blacklists (DNSBLs). Paste any IP, your mail server, a sender, or an IP from your email headers.
Spamhaus PBL and ZEN are shown as policy, not spam blacklists. PBL lists IP ranges that shouldn't send email directly (DNS servers, CDN IPs, broadband). Normal for non-mail IPs.
Spamhaus blocks queries from public DNS resolvers (including Cloudflare DNS used here) after a threshold. Spamhaus results showing "limit" are not real listings, they are query-limit errors (return code 127.255.255.x). For authoritative Spamhaus results, use check.spamhaus.org directly.
// what are dnsbl blacklists?
DNSBL (DNS-based Blackhole List) blacklists are real-time databases of IP addresses known for sending spam or malicious email. Mail servers query these lists before accepting email, if your IP is listed, your mail may be rejected or sent to spam.
Being listed doesn't always mean you sent spam, dynamic IP pools, compromised servers, and shared hosting IPs frequently get listed. If you're listed on a major list like Spamhaus, request removal and ensure your mail server is properly secured.
The most important lists to be clean on: Spamhaus ZEN (most widely used), Barracuda, and SORBS.