my $mac = <STDIN>;
chomp $mac;

if ( exists $macs{$mac} )
{
  print "Okay, found mac $mac:\n";
  print "response_status: $macs{$mac}{response_status}\n";
  print "response_date:   $macs{$mac}{response_date}\n";
}
else
{
  print "Sorry, don't recognize that mac\n";
}