Check which Azure service tag network prefixes contain a specific IP address

#azure-servicetags-ipnetwork.md

Run with PowerShell 7.4 or later based on .NET 8 which includes the new IPNetwork type. Requires authenticated Azure CLI.

# e.g. ns-sb2-prod-am3-002.cloudapp.net (service bus namespace in westeurope)
$ip=[net.ipaddress]::parse("104.46.32.56")

az network list-service-tags --location westeurope | `
  convertfrom-json | `
  select -exp values -pv st | `
  %{$_.properties.addressprefixes | `
    %{[pscustomobject]@{Name=$st.name;AddressPrefix=$_}}
  } | `
  ?{[net.ipnetwork]::parse($_.addressprefix).contains($ip)} | `
  ft -auto

Example result for 104.46.32.56 resolved from A record ns-sb2-prod-am3-002.cloudapp.net for Service Bus namespace in West Europe. This result shows that as of November 2023 Azure service tags are incorrect, since the IP address should be included in ServiceBus.WestEurope, but it is only included in the more general AzureCloud and related EventHub service tags.

Name                  AddressPrefix
----                  -------------
AzureCloud            104.46.32.0/19
AzureCloud.westeurope 104.46.32.0/19
EventHub              104.46.32.56/32
EventHub.WestEurope   104.46.32.56/32