Discover which Autonomous System Numbers (ASNs) are reserved by Microsoft and IANA for Azure Site-to-Site VPN connections, and which ones you cannot use in your Azure network configuration. Learn more about ASNs for optimal Azure networking.
Table of Contents
Question
You have an Azure subscription.
Your on-premises network contains a Site-to-Site (S2S) VPN connection to Azure.
You are configuring BGP for the VPN connection.
You need to assign an Autonomous System Number (ASN) to the on-premises network.
Which two ASNs can NOT be used for the on-premises network? Each correct answer presents a complete solution.
A. 1234
B. 12076
C. 65000
D. 65510
E. 65515
Answer
B. 12076
E. 65515
Explanation
Microsoft reserves 12076 for Azure public, Azure private, and Microsoft peering. Microsoft reserves 65515 for internal use. Virtual networks are created with the default ASN of 65515. The following ASNs are reserved by Azure or IANA:
ASNs reserved by Azure:
Public ASNs: 8074, 8075, and 12076
Private ASNs: 65515, 65517, 65518, 65519, and 65520
ASNs reserved by IANA:
23456, 64496-64511, 65535-65551, and 429496729
Customers use either 16-bit or 32-bit ASNs.
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