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

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Notes:

• Please enter IP addresses in normal forward octet order such as 10.20.30.40. They will be checked and displayed in reverse octet order such as 40.30.20.10. 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.