Check if an IP address is on spam or abuse blacklists. See your IP reputation across 10+ databases.
Checking IP reputation...
Scanning 10+ blacklist databases
An IP blacklist (also called a DNSBL - DNS-based Blackhole List) is a real-time database of IP addresses flagged for spam, malware, or abuse. When you send an email, visit a website, or connect through a proxy, the receiving server checks your IP against these lists before deciding whether to let you through.
Your IP connects to a server or sends an email
Server queries DNSBL lists and abuse databases in milliseconds
Listed? Traffic gets blocked, throttled, or flagged for review
Your IP is the first thing servers evaluate - before cookies, headers, or content. A blacklisted IP silently breaks things even when you've done nothing wrong.
blacklist databases
checked in parallel
We query the most widely-used DNSBL lists in email and web infrastructure - including Spamhaus, Barracuda, SpamCop, SORBS, and CBL - simultaneously via DNS lookups. Results come back in seconds.
On top of that, we pull crowdsourced abuse intelligence: confidence scores based on reports from sysadmins worldwide, ISP classification, usage type detection, and Tor exit node flagging.
If your IP shows up on one or more lists, here's what to do - fastest options first.
The fastest fix. Switch proxies or request a new IP from your provider. Mobile carrier IPs are almost never blacklisted - they're shared among millions of legitimate users.
Most DNSBL operators have a self-service removal form. Once the abuse source is resolved, submit a delisting request. Processing typically takes 24–72 hours.
On a shared service? Your provider owns the IP block's reputation. They should handle delisting or swap you to a clean range.
Some lists (like SpamCop) automatically clear after 24–48 hours of no new reports. If the abuse has stopped, the listing may resolve on its own.
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