That's not sufficient. There is probably whitespace at the end of $parameter_value: 
      print "Failed -> $key:$parameter_value<<<\n"

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Please read the Basic debugging checklist.

Print a full $line and post it.

Are you using the latest version of Data::Validate::IP from CPAN?

In reply to Re^3: IP address validation when IP is picked dynamically by toolic
in thread IP address validation when IP is picked dynamically by rahulruns

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