Blocklist Checker

Check whether an IP address or a domain is listed on the major email blocklists (Spamhaus, SpamCop, Barracuda, UCEPROTECT, SURBL, URIBL and more). Free, instant, nothing stored. For a domain we also resolve its IP and check that too.

Enter an IPv4 address or a domain above. We query 9 IP blocklists and 3 domain blocklists live.

Listed and don't know why? Run our Deliverability Test to see how mailboxes actually score your mail, or check your authentication setup. Blocklist listings from Spamhaus are served via our licensed data feed.

Built & updated automatically by MailTester Ninja — the email verifier that stores nothing. DNS-only, aggregate data, no personal information. · JSON API · RSS