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DNSBL Lookup

Check to see if an IP address is listed with nearly 40 DNS based anti-spam databases.

DNS Blackhole List

Check an IP address against 40 DNS based anti-spam databases.

Enter hostname or IPv4 address.

Tool description

A DNS Blackhole list (DNSBL) contains a set of IP addresses which are most often used for spamming activities. Mail servers can be configured to reject or flag messages which have been sent from an IP listed on one or more blackhole lists. This tool checks an IP address in real time on more than 40 different blackhole lists.

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