Instantly check if your IP address is listed on Spamhaus, Barracuda, SpamCop and 20+ major RBL/DNSBL blacklists.
No signup required · Spamhaus, Barracuda, SpamCop and more
Inspect your email infrastructure — no signup required
20+ curated email blacklists (Spamhaus, Barracuda, SpamCop, UCEPROTECT, MailSpike, SORBS). No dead lists, no noise.
Custom unbound recursive resolver. Spamhaus and other major RBLs return accurate results — no "open resolver" blocks.
10 free queries per day. Shareable URLs (/blacklist-check/8.8.8.8) for support workflows.
20+ years of telecom and email operations expertise. About us.