Autonomous System Numbers – BGP

Autonomous System Numbers – BGP

- in CCNA, Enterprise Infrastructure
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There are two types of BGP Autonomous system numbers: Private and Public.

Various routing protocols use Autonomous System (AS) Numbers. IANA allocates AS Numbers to Regional Internet Registries (RIRs). The five RIRs are:

  • AFRINIC
  • APNIC
  • ARIN
  • LACNIC
  • RIPE_NCC

AS Numbers can be obtained from the registry in your region.

16-bit ASN

NumberAssignment
0Reserved
1-48127 Assigned
48128-54271Unassigned
54272-64511Reserved by IANA
64512-65534Free for internal use (private range)
65535Reserved
16-bit ASN

32-bit ASN

NumberAssignment
0.0-0.65535Old 16-bit ASNs
1.0-1.65535reserved
2.0-2.1023Allocated to APNIC
2.1024-2.65535Unassigned
3.0-3.1023Allocated to RIPE NCC
3.1024-3.65535 Unassigned
4.0-4.1023 Allocated to LACNIC
4.1024-4.65535Unallocated
5.0-5.1023Allocated to AfriNIC
5.1024-5.65535Unallocated
6.0-6.1023Allocated to ARIN
6.1024-65535.65534Unallocated
65535.65535reserved
32-bit ASN

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