IP Blacklist Check

Mail servers consult DNS blocklists (DNSBLs) to reject email from addresses with a history of spam or abuse. If your server's or home IP is listed, your emails may bounce.

Tool status: Functional with limitations Works, but there are technical limits explained on the page.

What this tool can and cannot do

We check a selection of public DNSBLs that allow free queries. Some lists (notably Spamhaus) restrict free use and refuse queries from shared resolvers, so they are not included by default. "Query refused" or "timeout" means that list could not be checked, not that the IP is clean. IPv6 is not supported by most lists.

Data sources: Public DNS blocklists (DNSBL)

Understanding the results

Listed: the blocklist currently lists the address. Visit that list's website to see the reason and request delisting. Dynamic home IPs are often listed by policy because they should not send mail directly.

Troubleshooting

  • Fix the cause first (an infected device, an open mail relay or a compromised account), then request removal from each list.

Frequently asked questions

My home IP is listed – is that bad?

Usually not. Some lists include all residential addresses by policy. It only matters if you run a mail server from that address.