#!/bin/bash
class_b="10.10"
sub=0
subnets=256
plithos=256
start_ip=0
name="dnsname-"
name_start=1
 
for ((subnet=0;subnet<subnets;subnet++,sub++)); do
  for ((ip=start_ip;ip<plithos;ip++,name_start++)); do
    prefix=$name
    if [ $name_start -lt 1000 ]; then
        prefix=$prefix"0"
    fi
    if [ $name_start -lt 100 ]; then
        prefix=$prefix"0"
    fi
    if [ $name_start -lt 10 ]; then
        prefix=$prefix"0"
    fi
    echo $prefix$name_start" IN A "$class_b"."$sub"."$ip
  done
done