DNS Reverse Name Resolution Using the IN-ADDR.ARPA Domain
If most people were asked to identify the core job of DNS to one function, they would probably say it was converting the names of objects into the numeric IP addresses associated with them. (Well, they would if they knew much about DNS.) For this reason, DNS is sometimes compared to a telephone book, or to telephone 411 (information) service. There are certain problems with this analogy, but at the highest level, it is valid. In both cases, we take a name, consult a database (of one type or another), and produce from it a number that matches that name.
In the real world, there are sometimes situations where you don't want to find the phone number that goes with a name, but rather, you have ...
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