Enter a Fully Qualified Domain Name or valid IP.
Only domain-legal characters a-z, 0-9, dot '.' and dash '-' are allowed.


  • 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.