Due to a number of issues, I was once required to delete some reverse lookup zones in DNS and then recreate them. There were two reasons I had to do this, firstly there were some conflicting replications configurations, secondly I was merging some DNS servers and finally I was making the reverse look zones class B instead of 2 dozen class C zones.

Before I start, there is one limitation with this script. All of entries you are importing must belong to the same reverse lookup zone. For example, this script would handle importing entries of 10.0.0.23, 10.0.0.55 into a reverse lookup zone of 10.0.0.0/24 or even 10.0.0.0/16; however it will fail if you try to import those entries into a zone of 172.16.0.0/24.

This script I wrote for these sort of situations, and many others. Whenever doing this work, I have always had a resulting CSV file with my entries that I need to end up back in DNS. This file has had the following format:

host, ip

hostname1.domain.local, 10.0.0.1

hostname2.domain.local, 10.0.0.2

Once you have a CSV file of the above format, point the following code at it:

$filename = read-host "CSV filename"
$dnsserver = Read-Host "dnsserver"
$namespace = read-host "namespace - format 201.168.192.in-addr.arpa"
$entries = import-csv $filename
foreach ($entry in $entries) {
    dnscmd $dnsserver /recordadd $namespace $entry.ip "ptr" $entry.host
}