Turn off default IPv6 DNS Servers
Supported on: At least Windows Server 2012, Windows 8 or Windows RT
Registry
HKLM
Software\Policies\Microsoft\Windows NT\DNSClient Value name: DisableIPv6DefaultDnsServers
Enabled: DisableIPv6DefaultDnsServers = 1
Disabled: DisableIPv6DefaultDnsServers = 0
Description
If you enable this policy, the DNS client will not use the default IPv6 DNS server addresses provided by Windows.