Specify address space and subnet
Contents
- Provide a name (eg MyVirtualNetwork) for the virtual network
- Provide a name (eg MyResourceGroup) for the new resource group (or choose an existing resource group that you created earlier)
The other options can be left to their default, but you can optionally choose:
- a bigger or smaller network: the address space must be contained within the standard private address space (10.0.0.0/8, 172.160.0.0/12 or 192.168.0.0/16). The number after the / indicates the size of the network, see the below table for a match between number and size.
- The subnet size. The subnet must be contained within the address space. The subnet can be smaller than the address space. All virtual machines within the same subnet will be able to communicate with each other over the (private) network.
Address space size
| Size | Available addresses |
|---|---|
| 8 (Class A) | 16,777,216 (224) |
| 16 (Class B) | 65,536 (216) |
| 24 (Class C) | 256 (28) |
Subnet size
| Size | Usable hosts in subnet |
|---|---|
| 24 | 254 |
| 25 | 126 |
| 26 | 62 |
| 27 | 30 |
| 28 | 14 |
| 29 | 6 |
| 30 | 2 |
| 31 | 2 |