IP range definitions
A DNS manages a bunch of relations between names and IP numbers.
Every time one adds a new definition to the DNS (a new machine),
he has to find an unused IP number. Further, it has to get some
good knowledge of the network to know which one to use.
A common practice is to document the general organization of the
network, associating IP numbers range to logical part of the
Linuxconf allows you to enter this information here and
will use later, making DNS management much nicer.