Windows AD DNS Export
From KlavoWiki
To export an Activie Directory integrated zone.
Export-DnsServerZone -Name "domainname.com" -FileName "domainname.com.txt"
or
dnscmd /zoneexport domainname.com domainname.com.txt
To ensure you don't receive a permission denied error change folders to C:\windows\system32\dns. If you are located in any other folder when the command is executed the exported file is save to the folder:
c:\windows\system32\dns