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Localscan is a Perl-based frontend for nmap. It allows the user to compare the results of an nmap portscan with the results of a previous nmap portscan made when the subnet or IP range being scanned was in a "known-good" configuration. Essentially, localscan allows the user to use a portscanner and ask "What new ports are open?" instead of just asking "What ports are active?"

Localscan is a Perl-based frontend for nmap. It allows the user to compare the results of an nmap portscan with the results of a previous nmap portscan made when the subnet or IP range being scanned was in a "known-good" configuration. Essentially, localscan allows the user to use a portscanner and ask "What new ports are open?" instead of just asking "What ports are active?"