Blacklist & Reputation Checker — DNSBL & Domain Lists
Email servers and firewalls use DNSBL (DNS-based Blackhole Lists) to block spam. If your IP or domain is listed, emails may go to spam or be rejected entirely. Check 10+ major blacklists including Spamhaus, SpamCop, SORBS, Barracuda, and SURBL.
Why is my IP blacklisted?
Common reasons: your server sent spam (malware infection, compromised credentials), open email relay misconfiguration, or your IP was previously assigned to a spammer. Check your server logs immediately.
How do I delist my IP?
Each DNSBL has a removal process: Spamhaus at spamhaus.org/lookup, SpamCop via spamcop.net. First fix the root cause (spam source), then submit a removal request. Delisting takes 24-72 hours.
What is Spamhaus ZEN?
Spamhaus ZEN combines SBL (spam sources), XBL (exploited/hacked IPs), and PBL (ISP-assigned dynamic IPs) into one comprehensive lookup. It's the most widely used IP blacklist.
Does being blacklisted affect my website?
IP blacklisting primarily affects email delivery. However, if your IP is on threat intelligence lists, some web proxies and CDNs may also block or rate-limit traffic from it.