Microsoft PeerAsn is used to associate your public Autonomous System Number (ASN) information with an Azure subscription.

PeerAsn is a pre-requisite to setup a peering with Microsoft. You are required to provide ASN and Network Operations Center (NOC) contact information. Microsoft validates the request against PeeringDB. Peers are expected to have a complete and up-to-date profile on PeeringDB.

If you need to associate multiple ASNs with a subscription, you may do so by creating a PeerAsn resource for each ASN.