because we wasted a good amount of time today assuming that it was
returning the actual netmask. Specifically, we were confused why it
returned 0x18 instead of 0xffffff00 for a class C subnet (the
head-smacking moment wasn't until [much] later when we converted 0x18
to decimal, which is 24. Then the Clue Light(tm) went on).
This commit was SVN r20002.