Check a domain or IP against email blacklists
Type a domain or an IPv4 address. It is looked up on public DNS blocklists (Spamhaus, Barracuda, SpamCop, SURBL, URIBL and more), with your mail servers' IPs checked too, and how to get delisted from each. Free, no account.
What gets checked
Nothing has been looked up yet. Type a domain or IP above.
Type a domain or IPv4 address to check it against 9 public blocklists: 6 IP lists, and 3 domain lists. A domain's mail server IPs are checked on the IP lists too.
The lists and how to get delisted
| List | What it lists | How to get off it |
|---|---|---|
| Spamhaus ZEN zen.spamhaus.org · IP | Spamhaus's combined IP list (SBL, CSS, XBL and PBL), used by a large share of mail servers. | Look the IP up at Spamhaus's checker, fix the cause it names (a compromised account, an open relay, a home IP sending mail) and request removal there. PBL entries are normal for home connections; send through your provider's mail server instead. |
| Barracuda BRBL b.barracudacentral.org · IP | Barracuda's reputation list, used by Barracuda spam firewalls and others. | Check the IP at Barracuda Central and use its removal request form, after fixing what sent the spam. Requests are usually reviewed within a day or two. |
| SpamCop bl.spamcop.net · IP | Built from spam reports by SpamCop users; entries expire on their own. | SpamCop listings expire automatically about a day after reports stop. Fix the source; there is no paid removal. |
| UCEPROTECT Level 1 dnsbl-1.uceprotect.net · IP | Lists single IPs seen sending to its spam traps. Few large providers block on it. | Level 1 entries expire on their own after seven days without new spam; check the IP on UCEPROTECT's site. You do not need to pay for removal. |
| PSBL (Passive Spam Block List) psbl.surriel.com · IP | Lists IPs that send to its spam traps and are not known mail servers. | Look the IP up at psbl.org and remove it yourself with the link on the result page. |
| Mailspike BL bl.mailspike.net · IP | A reputation list of IPs sending spam, built from mail traffic. | Mailspike entries clear as the IP's sending reputation improves; its site explains the lookup and removal steps. |
| Spamhaus DBL dbl.spamhaus.org · domain | Spamhaus's list of domains found in spam, phishing and malware. | Look the domain up at Spamhaus's checker; it says why it was listed and how to request removal once the cause is fixed. |
| SURBL multi.surbl.org · domain | Domains that appear in the body of spam and phishing messages. | Use SURBL's lookup page; it explains why a domain is listed and links to the removal request. |
| URIBL multi.uribl.com · domain | Domains that appear in unsolicited email, checked by many spam filters. | Look the domain up on URIBL's site and use its removal request, after stopping the mail that got it listed. |
How the check works
A DNS blocklist answers a lookup of the reversed IP (for 203.0.113.7, 7.113.0.203.zen.spamhaus.org)
or of the domain under its zone. No answer means not listed; an answer in 127.0.0.x means listed,
with the last number saying why. Some answers mean the list refused the query: Spamhaus answers
127.255.255.x to resolvers it does not serve, and SURBL and URIBL answer 127.0.0.1. Those are shown
as unavailable, never as clean. All lookups share one 6-second budget and nothing is stored.
If you are listed
- Find the cause first: a hacked mailbox or website form, a bought or old list with spam traps, or sending from a home connection.
- Fix it, then request removal on the list's own site (links above). Never pay a third party to delist you.
- Clean your list before the next send, and check SPF, DKIM and DMARC.
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Questions
Type the domain above. It is looked up on domain blocklists (Spamhaus DBL, SURBL, URIBL), and the IPs of its mail servers on the IP lists.
The list refused our server's query or answered with an error code, so the result is unknown. Check that list on its own website with the link in the table.
It depends on the list. SpamCop and UCEPROTECT Level 1 entries expire on their own; Spamhaus and Barracuda take a removal request after you fix the cause.
Usually spam complaints, hitting spam traps on old or bought lists, a hacked account or form, or sending straight from a home IP. Verify addresses before sending.
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