Hi Exporters, May I know how to get the Nic list under a Subnet? Is there any Azure Rest api to do this? From https://zcusa.951200.xyz/en-us/rest/api/virtualnetwork/network-interfaces/list?view=rest-virtualnetwork-2024-05-01&tabs=HTTP , it seems it can only list by Subscription Resource group level. Thanks

@Shijun Lv , Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well. Resource are grouped under Subscription and Resource groups - these are the logical groupings in Azure used to get or list resources. I am not aware of any REST API to list NICs based on their subnet. Instead, you can use Azure Resource Graph Resources | where type =~ 'microsoft.network/networkinterfaces' | project id, ipConfigurations = properties.ipConfigurations | mvexpand ipConfigurations | project id, subnetId = tostring(ipConfigurations.properties.subnet.id) | parse kind=regex subnetId with '/resourceGroups/' resourceGroup '/providers/Microsoft.Network' provider '/virtualNetworks/' virtualNetwork '/subnets/' subnet | where virtualNetwork == "<NAMEOFVNETOFTHESUBNET>" and subnet == "<NAMEOFSUBNET>" and resourceGroup == "<NAMEOFRGOFTHESUBNET>" | project id, virtualNetwork, subnet, resourceGroup And directly download the results as a CSV File . Kindly let us know if this helps or you need further assistance on this issue. Thanks, Kapil Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.

How to List the Network Interface under a Subnet

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KapilAnanth-MSFT 48,081 Reputation points Microsoft Employee

2024-12-24T04:31:17.06+00:00
@Shijun Lv ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Resource are grouped under Subscription and Resource groups - these are the logical groupings in Azure used to get or list resources.

I am not aware of any REST API to list NICs based on their subnet.

Instead, you can use Azure Resource Graph

Resources | where type =~ 'microsoft.network/networkinterfaces' | project id, ipConfigurations = properties.ipConfigurations | mvexpand ipConfigurations | project id, subnetId = tostring(ipConfigurations.properties.subnet.id) | parse kind=regex subnetId with '/resourceGroups/' resourceGroup '/providers/Microsoft.Network' provider '/virtualNetworks/' virtualNetwork '/subnets/' subnet | where virtualNetwork == "<NAMEOFVNETOFTHESUBNET>" and subnet == "<NAMEOFSUBNET>" and resourceGroup == "<NAMEOFRGOFTHESUBNET>" | project id, virtualNetwork, subnet, resourceGroup

And directly download the results as a CSV File.

Kindly let us know if this helps or you need further assistance on this issue.

Thanks,

Kapil

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
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Shijun Lv 126 Reputation points Microsoft Employee

2024-12-24T05:01:56.17+00:00

Thanks @KapilAnanth-MSFT ,

But the Azure resource graph method you used is list the IP config under the subnet, Not the Nic list under subnet.

Since we need to update the nics under subnet, the resource Id of nic is required.

KapilAnanth-MSFT 48,081 Reputation points Microsoft Employee

2024-12-24T05:25:01.8666667+00:00

@Shijun Lv ,

Correct.

A network interface does not have a subnet Property

The subnet property is contained in the IP Config of the NIC only

Even with the REST API you shared, please check the Sample response

You will see "subnet" property is nested under "ipConfigurations" only

So basically, I am querying for "networkinterfaces.properties.ipConfigurations.properties.subnet.id"

This makes sense, as the subnet of the IP Configuration is same as the subnet of the NIC

And all the IP Configurations of a NIC should be in the same subnet

If you feel like multiple IP Configurations in a single NIC would result in duplicate entries,

That is not the case.

The query selects only the NIC's first IP Config and lists it's subnet.

Every other IP Config would have the same subnet, so we can ignore them.

I see you mentioned "we need to update the nics under subnet, the resource Id of nic is required."

Did you try running the command?

I got the resource IDs of the NICs only (without any duplicates even if there are multiple IP Configs for a single NIC)

Thanks,

Kapil

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Shijun Lv 126 Reputation points Microsoft Employee

2024-12-25T02:03:36.64+00:00

Thanks @KapilAnanth-MSFT , I think I got the answer, although the subnet only contains Ip configuration list, the IP configuration resource Id contains the network interface resourceId.

Therefore I can still use the get Subnet ARM API ,and extract Nic resourceId from IP configuration resourceId.
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