Maximum length of Azure Resource IDs?

Question

Is there an absolute maximum length of Azure Resource IDs, independent of the resource type?

Some parts of the structure are fixed (like subscription id) and others like group and resource name have documented limits. But RP namespace and resource types seem to add some unknown into the mix.

/subscriptions/{subscription-id}/resourceGroups/{resource-group-name}/providers/{resource-provider-namespace}/{resource-type}/{resource-name}

Answer 1

There is no official documentation which specifies the max character limit for Azure Resource ID.

Note: So this is not the answer, but an attempt to answer.

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Fully qualified resource IDs for the resources have format as mentioned in docs:

/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/{resourceProviderNamespace}/{resourceType}/{resourceName}

Also, this doc specifies the max allowed limits:

• subscriptionId: 36
• resourceGroupName: 90
• longest entry for resourceProviderNamespace as per docs is: 45, but may be assume it to be 64 chars.
• resourceType: These can't be guessed. Although there is command to list the types. And Assume it to be about 256 chars.
• resourceName: 512 chars after a quick look at the docs.

fields	Approx. chars
subscriptionId	36
resourceGroupName	90
resourceProviderNamespace	64
resourceType	256
resourceName	512
fixed chars	44
Total	1002

Warning: This is an educated guess. You're welcome to improve or quote the official figure, if available in future.