Virtual Networks (VNET) and subnets resources help define a security boundary for workloads running in Azure. A VNet is characterized by a collection of address spaces, defined as CIDR blocks.
Note
Network administrators are familiar with CIDR notation. If you are not familiar with CIDR, learn more about it.
VNets contain the following properties.
| Property | Description | Sample values |
|---|---|---|
| addressSpace | Collection of address prefixes that make up the VNet in CIDR notation | 192.168.0.0/16 |
| subnets | Collection of subnets that make up the VNet | see subnets below. |
| ipAddress | IP address assigned to object. This is a read-only property. | 104.42.233.77 |
A subnet is a child resource of a VNet, and helps define segments of address spaces within a CIDR block, using IP address prefixes. NICs can be added to subnets, and connected to VMs, providing connectivity for various workloads.
Subnets contain the following properties.
| Property | Description | Sample values |
|---|---|---|
| addressPrefix | Single address prefix that make up the subnet in CIDR notation | 192.168.1.0/24 |
| networkSecurityGroup | NSG applied to the subnet | see NSGs |
| routeTable | Route table applied to the subnet | see UDR |
| ipConfigurations | Collection of IP configruation objects used by NICs connected to the subnet | see UDR |
Sample VNet in JSON format:
{
"name": "TestVNet",
"id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/TestRG/providers/Microsoft.Network/virtualNetworks/TestVNet",
"etag": "W/\"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx\"",
"type": "Microsoft.Network/virtualNetworks",
"location": "westus",
"tags": {
"displayName": "VNet"
},
"properties": {
"provisioningState": "Succeeded",
"resourceGuid": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
"addressSpace": {
"addressPrefixes": [
"192.168.0.0/16"
]
},
"subnets": [
{
"name": "FrontEnd",
"id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/TestRG/providers/Microsoft.Network/virtualNetworks/TestVNet/subnets/FrontEnd",
"etag": "W/\"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx\"",
"properties": {
"provisioningState": "Succeeded",
"addressPrefix": "192.168.1.0/24",
"networkSecurityGroup": {
"id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/TestRG/providers/Microsoft.Network/networkSecurityGroups/NSG-BackEnd"
},
"routeTable": {
"id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/TestRG/providers/Microsoft.Network/routeTables/UDR-FrontEnd"
},
"ipConfigurations": [
{
"id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/TestRG/providers/Microsoft.Network/networkInterfaces/NICWEB1/ipConfigurations/ipconfig1"
},
...]
}
},
...]
}
}
- Get more information about VNet.
- Read the REST API reference documentation for VNets.
- Read the REST API reference documentation for Subnets.