You are using a character class in your match.
means a "1" to "9" and excatly one of it.
To select only one or two digit number use somethin like
print "$_\n" if /192\.168\.\d\d?\.\d+/g
Update: bpphillips is right with his answer (shame on me!),
so I changed the description.
At least the regex was ok ;-)
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