VBoxManage natnetwork add --netname mdbnet --network "172.16.16.0/28" --enable
VBoxManage modifyvm DC01 --nic1 natnetwork --natnetwork1 mdbnet
VBoxManage natnetwork remove --netname mdbnet
Within a NAT Network certain IP addresses are reserved. In our example network (172.16.16.0/28) the following addresses will be reserved...
172.16.16.0 - interface address
172.16.16.1 - default gateway
172.16.16.2 - Host loopback
172.16.16.3 - DHCP
If DHCP is disabled 172.16.16.3 will not be used, but I still suggest it is safer to avoid using it for other devices.CIDR