Reverse DNS records

I am trying to clean up the DNS reverse records, in our test environment.  
Can anyone make any suggestions on the best way to do this.

Keep in mind this is a test environment.
How can I tell if reverse DNS records are old and no longer needed etc....
zero000koolAsked:
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arnoldCommented:
Enable scavenging Make sure to statically add reverse records for static IPs are assigned making sure not to check that it is expiring.  Usually the client or the DHCP server will record their reverse when the ip is allocated.

Reverse DNS internally is not that important, .......
Will SzymkowskiSenior Solution ArchitectCommented:
When you remove A Host records it will also remove the reverse record as well that it is associated with.

Will.
zero000koolAuthor Commented:
Is there a powershell one line command to run to let me know the oldest PTR (reverse lookup) record.  So I can go by that and see which ones to remove.

Thanks
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arnoldCommented:
Not sure, but the following might be the start point to get to the point ...

The below is a reference, search for "powershell wmi ad DNS"
Get-WmiObject -namespace "root\MicrosoftDNS" -Credential DnsServer\Administrator -ComputerName DnsServer -list

Is your reverse zone defined as ad integrated?
zero000koolAuthor Commented:
Yes it is AD integrated.

Is there a one line command powershell to give me starting with the oldest DNS record working down by date.
Oldest at the top and recent at the bottom.

Thanks
arnoldCommented:
Sorry, got involved with something else, and could not get to the powershell code reference to display...

try the following instead of powershell
dnscmd DNSSERVER /zoneprint <reverse DNS zone>
Lets say your IPs are on the 192.168.0.0/24 (0.168.192.in-addr.arpa)
dnscmd DNSSERVER /ZonePrint 0.168.192.in-addr.arpa
this will include the aging data you are looking for.
Those that have [Aging:] are dynamically added.

If you have a windows DHCP server, its configuration could be set on the DNS tab to add and remove records when the lease expires.......

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Windows Server 2012

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