IP blacklist check (DNSBL)
If your website or mail server IP is blacklisted, your emails get rejected and your site may be blocked. Enter a domain or IP and check the major lists.
Which blacklists are checked
The checker resolves the domain to its IPv4 address, or takes the IP you enter, and looks it up in five widely used DNS blacklists (DNSBL): Spamhaus ZEN, SpamCop, Barracuda, PSBL and SORBS. Mail servers query lists like these before accepting a message, so a listing on any of them can get your mail rejected.
The Check my IP button tests the address you are browsing from. A website's IP is often shared hosting, so a listing may be caused by another site on the same server. For mail, check the IP of the server that actually sends your messages, which is often not the website's IP.
How to read the result
- Clean: the IP is not on any of the five lists. Large providers such as Microsoft and Gmail also keep their own reputation data, which no public check can see.
- Listed: the result shows which lists the IP is on. First find and stop the source of the spam (a hacked mailbox, a contact form abused by bots, malware), then request removal on that list's website.
- Only IPv4 addresses can be checked; most DNSBLs are built for IPv4.
Related errors and guides
- How to get an IP removed from a blacklist
- What a DNSBL is
- 550 5.7.1: message rejected
- 550 5.7.708: traffic not accepted from this IP
- Emails going to spam
Frequently asked questions
- Does a blacklisted IP hurt my site's Google ranking?
- Not directly: DNSBLs are used by mail servers, not by search engines. The real damage is to email, including order confirmations and messages from your site's contact form.
- How long does removal take?
- Some lists drop an IP automatically within a day to a few days once the spam stops; others require a request on their website. Asking for removal without fixing the cause usually gets the IP listed again.
- My domain is clean, but my mail is still rejected. Why?
- The check tests the website's IP. If your mail goes out through another server (Google Workspace, Microsoft 365, a separate mail host), check that server's IP, which you can find in the headers of a message you sent.