This Perl module is an easy-to-use library for looking up IP addresses against multiple DNSBLs at once. It supports different types of DNSBLs: Normal, meaning that any returned A record indicates a hit, match, meaning that one of the returned A records must exactly match a given IP address, mask, meaning that one of the returned A records must evaluate to non-zero when bitwise-ANDed against a given IP address, or txt meaning that TXT records should be looked up and returned (rather than A records).