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Checker

Blacklist check for IPs and domains

Check whether an IP address or domain is listed on major blocklists: Spamhaus, Barracuda, SpamCop, SURBL, URIBL and more.

What the blacklist check checks

Mail servers query blocklists (DNSBLs) for every incoming email. If the sender's IP address or a domain from the email is listed, the email ends up in spam or is rejected.

  • IP addresses are checked against Spamhaus ZEN, Barracuda, SpamCop, UCEPROTECT, PSBL, Mailspike, DroneBL and GBUdb.
  • Domains are checked against Spamhaus DBL, SURBL and URIBL – this applies to sender domains as well as domains in links.

Lookups go through our own DNS resolver directly to the list operators. Results are cached for 5 minutes. Want to know every day whether your domain and sending IPs are clean? With a free account, domain monitoring does that for you.

FAQ

How do I check if my IP address is on a blacklist?

Enter the IP address of your mail server or sending service. We query it directly at Spamhaus ZEN, Barracuda, SpamCop, UCEPROTECT and other blocklists and show per list whether it is listed. You'll find the IP in the header of a sent email, in your server's topmost Received line.

Why do my emails go to spam even though I'm not on a blacklist?

Blocklists are only one reason. More often SPF, DKIM or DMARC are missing, the reverse DNS record doesn't match or the content looks like advertising. A full email test checks all of this at once.

How do I get removed from a blacklist?

First fix the cause, such as a hacked account, an open relay or purchased address lists. Then request delisting from the list operator; Spamhaus and Barracuda have their own forms for this. Many lists also remove entries by themselves after a few days.

Is a UCEPROTECT level 2 or 3 listing a problem?

These levels list entire network ranges of your provider, not your IP itself. Most major mailbox providers don't use them. Spamhaus, Barracuda and SpamCop matter most.