DNSBL lookup
Check an IPv4 address or hostname against the major DNS blacklists (DNSBLs) that mail servers and abuse filters consult — Spamhaus ZEN, SpamCop, SORBS, PSBL and more.
| IP | Blacklist | Status | Return code | Reason | Latency |
|---|
Check a target to query the blacklists.
A proxy whose exit IP sits on a DNSBL gets your mail rejected and trips anti-abuse filters on many sites. Check candidates here before you rely on them, and combine with the proxy risk checker for proxy/VPN/Tor and abuse-history signals.
Listed means the zone returned a 127.0.0.x code (the reason column shows the list's own explanation when published). Clean means not listed. Error means the list refused or the query timed out — some lists throttle public resolvers, so an error is not a listing. Aggressive lists (e.g. UCEPROTECT) list whole ranges; a single hit there matters less than a Spamhaus or SpamCop hit.