Export all hosts from DNS Manager using Powershell
Solution 1:
I've used DNSShell before. http://dnsshell.codeplex.com/. To get all A records in a zone you can do this:
Get-DnsRecord -RecordType A -ZoneName FQDN -Server ServerName
To get this into a text file:
Get-DnsRecord -RecordType A -ZoneName FQDN -Server ServerName | % {Add-Content -Value $_ -Path filename.txt}
Solution 2:
Another method I don't see mentioned yet:
Get-WmiObject -Namespace Root\MicrosoftDNS -Query "SELECT * FROM MicrosoftDNS_AType WHERE ContainerName='domain.com'"
WMI is good to remember when you can't download DnsShell for some reason, or if you're on an older version of Powershell that doesn't have the baked-in Cmdlets, or if you're targeting an older version of Windows Server.