I think you might be well served by using a HoH (hash-of-hashes) for this. Consider the following data structure:

$VAR1 = {
          '0810100293' => {
                            'ip' => '192.168.1.2',
                            'host' => 'otherbox.myhome.com'
                          },
          '0810100294' => {
                            'ip' => '192.168.1.3',
                            'host' => 'thisbox.myhome.com'
                          },
          '0810100295' => {
                            'ip' => '192.168.1.4',
                            'host' => 'thatbox.myhome.com'
                          },
          '0810100292' => {
                            'ip' => '192.168.1.1',
                            'host' => 'mybox.myhome.com'
                          }
        };
[download]

This should allow you to do simple lookups of the IP addresses and host names, and all contained in one variable.

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