This is perl, v5.6.1 built for MSWin32-x86-multi-thread (with 1 registered patch, see perl -V for more detail)

Copyright 1987-2001, Larry Wall

Binary build 628 provided by ActiveState Tool Corp. http://www.ActiveState.com Built 15:41:05 Jul  4 2001

libnet            [1.07.03] Collection of Network protocol modules