Scavenge is a utility to analyze DNS records within an IP address range.
It scans the range and classifies its findings into 4 categories:

    - Missing A records
    - Missing PTR records
    - Mismatched A/PTR records
    - Stale PTR records

WWW: http://mark.foster.cc/wiki/index.php/Scavenge

- mdf
mark@foster.cc