Blacklist Check

Is a domain or IP on a blocklist?

Check an IP address or domain against major DNS blocklists (Spamhaus, Barracuda, SpamCop and more) that mail providers use to decide what to reject.

How to read the results

1.Enter an IP address, or a domain (we resolve it to its IP first).
2.Each row shows whether that blocklist currently lists the address. Even one listing can hurt deliverability.
3.If listed, visit the blocklist’s site to see why and how to request removal.

When a domain’s mail suddenly starts landing in spam or bouncing, a blocklist listing is a common cause — and one you cannot see without checking.

I’m listed — what now?

Find the cause (compromised account, spammy mail, shared IP), fix it, then use the blocklist provider’s delisting process.

Does one listing matter?

It can. Major providers weight lists like Spamhaus heavily, so a single serious listing may be enough to hurt delivery.

Is a domain or IP on a blocklist?

Check an IP address or domain against major DNS blocklists (Spamhaus, Barracuda, SpamCop and more) that mail providers use to decide what to reject.

1.Enter an IP address, or a domain (we resolve it to its IP first).
2.Each row shows whether that blocklist currently lists the address. Even one listing can hurt deliverability.
3.If listed, visit the blocklist’s site to see why and how to request removal.

When a domain’s mail suddenly starts landing in spam or bouncing, a blocklist listing is a common cause — and one you cannot see without checking.

I’m listed — what now?

Find the cause (compromised account, spammy mail, shared IP), fix it, then use the blocklist provider’s delisting process.

Does one listing matter?

It can. Major providers weight lists like Spamhaus heavily, so a single serious listing may be enough to hurt delivery.