Blacklist Checker
Check an IP address or a domain against the major DNS blacklists. Enter a domain and we also check the IPs of its mail servers — the listing that actually stops your email.
What a blacklist listing actually does to you
DNS blacklists (DNSBLs) are databases of IP addresses and domains associated with spam. Receiving mail servers consult them in the first seconds of a connection. A listing on a major list like Spamhaus ZEN means large parts of the internet refuse your mail outright or file it as spam — usually with a bounce message so cryptic that the real cause goes unnoticed for days. On shared hosting the risk is doubled: your mail often leaves through a server IP shared with hundreds of other sites, and one neighbour's compromised contact form can list the address you all share.
Listed? The order of operations matters
First, stop the bleeding. Find and close the cause — a hacked mailbox, a compromised website form, an infected server. Delisting requests from a still-compromised source burn your one easy request. Second, request delisting on the list's own site; Spamhaus, Barracuda and the others each have a removal form, and most removals process within hours once the cause is fixed. Third, verify here, and keep verifying — which is precisely the kind of check that belongs on a schedule rather than in someone's memory. UptimeVitals runs blacklist checks as part of continuous monitoring for this reason.
Not every list matters equally. A listing on Spamhaus, Barracuda or SpamCop affects real delivery. A listing on a small list nobody consults is mostly a curiosity — and a handful of lists operate on a pay-to-delist model that the industry does not respect; never pay for removal.
Blacklist Checker — frequently asked questions
My domain is clean but my mail still lands in spam. Why?
Because the IP doing the sending is what receivers check first. Enter your domain above and look at the mail-server IP results — and also check authentication in the Full Site Health Check.
How does an IP get listed in the first place?
Sending spam (including from a hacked account), hosting a compromised script that sends mail, being part of a botnet range, or simply inheriting an address with a bad history on shared hosting.
How fast can I get delisted?
Major lists typically remove within a few hours of a valid request once the cause is fixed. Repeat listings make each removal slower and harder.
Should I check my website's IP too, or only mail?
Both matter, but differently: a listed mail IP breaks email; a listed web IP mainly matters if the same address sends mail. On most cPanel servers they are the same address — another reason one check should cover both.