IP Blacklist Check
Check if an IP is on spam blacklists (DNSBL).
How it works
Checks whether an IPv4 address appears on well-known DNS blacklists (DNSBLs) — the spam-source lists that mail servers consult. If your mail is landing in spam or being rejected, a blacklisting is a common cause.
Enter your mail server's IP (not your website's) to diagnose delivery problems.
Try an example
If listed, follow each provider's delisting process (the link in the detail line). Fix the underlying cause first, or you'll be relisted.