Acutis 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.
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.xcode, 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.
Listed somewhere — or just not sure what's wrong?
Blacklisting is one of many reasons traffic misbehaves. Acutis Go runs the full check — network, DNS and your own machine — in 60 seconds and tells you plainly where the problem is. Free.
Get Acutis Go — freeFind my real IP · Reverse DNS · DNS lookup
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Related guide: Why is my IP blacklisted?