IP blacklist check (DNSBL)

Enter an IPv4 address and we'll check it against several well-known DNS blocklists (DNSBLs / RBLs). If your mail server's IP is listed, your email is probably getting bounced or filed as spam.

Check blacklists

What the results mean

• Clean — the blocklist returned no listing (NXDOMAIN). Good. Most IPs are clean on most lists.
• Listed — the blocklist returned a 127.0.0.x code, meaning it considers this IP a source of spam or abuse. Mail from it may be rejected. Visit that blocklist's site to see why and how to delist.
• Could not check — that blocklist didn't answer over public DoH (some refuse browser queries). It's not a pass or a fail — just unknown from here.

Note: this checks the IP you enter, not the reputation of a domain or specific message. Residential IPs are frequently on policy lists (like Spamhaus PBL) by design — that's expected and only matters if you're trying to run a mail server from one.

FAQ

How do I check if my IP is blacklisted?
Enter your IPv4 address above and we query major DNS blocklists (DNSBLs / RBLs) — Spamhaus, SpamCop, Barracuda and SORBS — live in your browser. A "Listed" result means that blocklist flags your IP as a spam or abuse source.

Why is my IP blacklisted?
Usually spam or abuse seen from that IP (sometimes a previous owner's), an infected or misconfigured device on the network, or a residential IP on a policy list like Spamhaus PBL (normal — only an issue if you run a mail server from it).

How do I get my IP removed from a blacklist?
Fix the cause first (stop the spam source or clean the device), then submit the delisting request on that specific blocklist's website. Each list runs its own delisting process.

Is this blacklist checker free?
Yes. It's free, needs no sign-up, runs in your browser over public DNS-over-HTTPS, and nothing is stored.

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