To disable Round Robin
DNS server > Properties > Advanced > remove “Enable round robin”
Netmask ordering
For /24
Dnscmd /Config /LocalNetPriorityNetMask 0x000000ff
For /16
Dnscmd /Config /LocalNetPriorityNetMask 0x0000ffff
| Netmask | LocalPriorityNet |
| 255.255.255.0 | 0x000000ff |
| 255.255.0.0 | 0x0000ffff |
| 255.0.0.0 | 0x00ffffff |