Blacklist Lookup

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About Blacklist Lookup

Right here and now you can check to see if your IP address is listed on an anti-spam database. Will your emails or forum chats get blocked? Below is a list of the major databases that track blacklisted IP addresses — look at the list now and you'll see there are no checkmarks next to the database names.

The IP address blacklist check will show if the URL or IP entered consequently listed with DNSBL or SURBL systems. These systems uniquely used by email system administrators to try and eliminate spam email messages before they reach their users.  For example, mainly if a company uses email marketing, an IP blacklist is something to try to avoid. IP address blacklisting occurs when your IP address (or the IP address you share with others) ultimately ignored by a web hosting company. To clarify, any email you try to send consequently blocked and not forwarded.  This can easily be found out with using our IP address blacklist check.

IP Address Blacklist Check Databases

DNSBL is a Domain Name Blacklist

There are dozens of DNSBLs online, all of which use a wide variety of criteria for listing and delisting addresses. Spam filters utilize various DNSBLs to verify that the incoming emails do not originate from blacklisted sites. DNSBLs are generally the first line of defense against spam.

SURBLs(no longer an acronym)

These IPs are generally the second line of defense but not all spam filters are capable of using them. Blacklists of websites are SURBLs when appearing in unsolicited emails. Spam filters that can utilize the SURBLs will scan the body text of emails and extract any website addresses and check them against the blacklists. If found an address, the message appropriately flagged as spam and handled accordingly



  • SURBLs are lists of web sites that have appeared in unsolicited messages. Web sites almost always use domain names. Only rarely are IP addresses used as web sites. Web sites appearing as IP addresses are often cracked phishing or malware sites.
  • SURBLs are not lists of mail servers, mail senders, email addresses, open proxies or message sending IP addresses. They are lists of web sites.
  • Please enter IP addresses in normal forward octet order such as They will be checked and displayed in reverse octet order such as This is a traditional way that IP addresses are represented in blacklists.
  • Please do NOT use this web site for any automated lookups. Instead use DNS queries as described in the SURBL Implementation Guidelines.