IP blacklist check — is your IP on a spam / abuse blacklist?

IP blacklists (DNSBL / RBL) are maintained by different anti-spam or anti-abuse organizations. A hit may affect mail or network services that use that list, but each provider applies lists differently and one hit cannot predict every platform's response.

IPOK queries major DNSBLs on demand and combines them with recent snapshots from AbuseIPDB community reports, Spamhaus DROP, and a self-built offline reputation DB into a 0-100 purity score. Normal-cache and stale-fallback freshness is stated on the result and privacy pages.

IPOK also uses a /24-neighbor profile as context in its own score: non-blanket ranges use floors of 40 / 50 when anomalous-address share reaches 25% / 50%. This does not prove that an external platform blocks the whole range.