For a large number of servers in a given ip block, I frequently see people use the following notation which incorporates the ip address with the hostname:
ip-10.10.10.1.mydomain.com ip-10.10.10.2.mydomain.com ... ip-10.10.10.255.mydomain.com
Using this type of notation makes it easy to script the creation of your zone file. To generate the forward dns for this zone (mydomain.com), I would do the following:
for i in $(seq 1 255) do echo "ip-10.10.10.$i IN A 10.10.10.$i" >> db.mydomain.com done
Conversely, to generate the 10.10.10.0.in-addr.arpa reverse zone do the following:
for i in $(seq 1 255) do echo "$i IN PTR ip-10.10.10.$i.mydomain.com." >> 10.10.10.0.in-addr.arpa done
This creates the sequence from 1 to 255. For each iteration, you generate a line using echo for the given value of $i. Each line is appended to your zone file.
I like to use tabs instead of spaces in between columns. To add tabs to the echo statement, you need to escape each tab with a control-v. If you want to add two tabs, hit ‘control-v’ followed by the tab key followed by another ‘control-v’ and another tab.
There are obviously many other ways to do this. You can use a for loop:
for ((i=1; i<=255; i++));