subnet
Click on the red underlined text to get to the source
... information about hosts, networks, and subnets. Such information for
a small subset of hosts is currently contained in the flat-file UUCP
...
... network administrators to
specify the location of a network or subnet without requiring LOC RR
data for each individual host ...
... data for each individual host. For example, a computer lab with 24
workstations, all of which are on the same subnet and in basically
the same location, would only need a LOC RR for the subnet ...
... subnet and in basically
the same location, would only need a LOC RR for the subnet.
(However, if the file server's location has been more precisely
measured, a separate LOC RR ...
... A records (if any)
associated with the name MAY be checked for network (or subnet) LOC
RRs using the "Searching by Network ...
... multiple A records exist and have associated network or subnet LOC
RRs, the application may choose to use any, some, or all of the LOC
...
... RRs, the
network(s) or subnet(s) it is on may. If the application wishes to
search for such less specific data, the following algorithm ...
... algorithm SHOULD be
followed to find a network or subnet LOC RR associated with the IP
address. This algorithm ...
... RRs, it is best to use them if available. In order to do so, we
build a stack of network and subnet names found while performing the
[RFC 1101] search ...
...
0.2.9.128.IN-ADDR.ARPA. PTR div2-subnet.isi.edu.
A 255.255.255.240
...
... A 255.255.255.240
Push the name "div2-subnet.isi.edu" onto the stack of names to be
searched for LOC RRs later.
...
... RR is present at 16.2.9.128.IN-ADDR.ARPA., there are no
more subnet levels to search. We now pop the top name from the
stack and check for an associated LOC RR ...
... In this case, assume that inc-subsubnet.isi.edu does not have an
associated LOC RR, but that div2-subnet.isi.edu does. We will
then use div2-subnet.isi.edu's LOC RR ...
... RR, but that div2-subnet.isi.edu does. We will
then use div2-subnet.isi.edu's LOC RR as an approximation of this
host ...
... host's location. (Note that even if isi-net.isi.edu has a LOC RR,
it will not be used if a subnet also has a LOC RR.)
...