Autonomous System Numbers

(last updated 2007-10-11)

Registries included below:
- 16-bit Autonomous System Numbers
- 32-bit Autonomous System Numbers

Note:
The Autonomous System (AS) numbers are used by various routing protocols.
AS numbers are allocated to the regional registries by the IANA.
	AfriNIC       <hostmaster&afrinic.net>
	APNIC         <helpdesk&apnic.net>
	ARIN          <hostmaster&arin.net>
	LACNIC        <hostmaster&lacnic.net>
	RIPE-NCC      <ncc&ripe.net>
AS Numbers can be obtained from the registry in your region.
Listed below are the allocated blocks to the regional registries.

Registry Name: 16-bit Autonomous System Numbers
Reference: [RFC1930]
Registration Procedures: RIR request to the IANA

Registry: 16-bit Autonomous System Numbers
Number         Description                         Whois             Reference  Registration Date
------------   ----------------------------------- --------          ---------- -----------------
0              Reserved  - May be use to identify non-routed networks
1-1876         Allocated by ARIN                   whois.arin.net
1877-1901      Allocated by RIPE NCC               whois.ripe.net
1902-2042      Allocated by ARIN                   whois.arin.net
2043           Allocated by RIPE NCC               whois.ripe.net
2044-2046      Allocated by ARIN                   whois.arin.net
2047           Allocated by RIPE NCC               whois.ripe.net
2048-2106      Allocated by ARIN                   whois.arin.net
2107-2136      Allocated by RIPE NCC               whois.ripe.net
2137-2584      Allocated by ARIN                   whois.arin.net
2585-2614      Allocated by RIPE NCC               whois.ripe.net
2615-2772      Allocated by ARIN                   whois.arin.net
2773-2822      Allocated by RIPE NCC               whois.ripe.net
2823-2829      Allocated by ARIN                   whois.arin.net
2830-2879      Allocated by RIPE NCC               whois.ripe.net
2880-3153      Allocated by ARIN                   whois.arin.net
3154-3353      Allocated by RIPE NCC               whois.ripe.net
3354-4607      Allocated by ARIN                   whois.arin.net
4608-4864      Allocated by APNIC                  whois.apnic.net
4865-5376      Allocated by ARIN                   whois.arin.net
5377-5631      Allocated by RIPE NCC               whois.ripe.net
5632-6655      Allocated by ARIN                   whois.arin.net
6656-6911      Allocated by RIPE NCC               whois.ripe.net
6912-7466      Allocated by ARIN                   whois.arin.net
7467-7722      Allocated by APNIC                  whois.apnic.net
7723-8191      Allocated by ARIN                   whois.arin.net
8192-9215      Allocated by RIPE NCC               whois.ripe.net
9216-10239     Allocated by APNIC                  whois.apnic.net
10240-11263    Allocated by ARIN                   whois.arin.net
11264-12287    Allocated by ARIN                   whois.arin.net
12288-13311    Allocated by RIPE NCC               whois.ripe.net
13312-14335    Allocated by ARIN                   whois.arin.net
14336-15359    Allocated by ARIN                   whois.arin.net
15360-16383    Allocated by RIPE NCC               whois.ripe.net
16384-17407    Allocated by ARIN                   whois.arin.net
17408-18431    Allocated by APNIC                  whois.apnic.net
18432-19455    Allocated by ARIN                   whois.arin.net
19456-20479    Allocated by ARIN                   whois.arin.net
20480-21503    Allocated by RIPE NCC               whois.ripe.net
21504-22527    Allocated by ARIN                   whois.arin.net      
22528-23455    Allocated by ARIN                   whois.arin.net
23456          AS_TRANS                                                [RFC4893]
23457-23551    Allocated by ARIN                   whois.arin.net
23552-24575    Allocated by APNIC                  whois.apnic.net
24576-25599    Allocated by RIPE NCC               whois.ripe.net
25600-26623    Allocated by ARIN                   whois.arin.net                 2002-03
26624-27647    Allocated by ARIN                   whois.arin.net                 2002-09
27648-28671    Allocated by LACNIC                 whois.lacnic.net               2002-11
28672-29695    Allocated by RIPE NCC               whois.ripe.net                 2002-12
29696-30719    Allocated by ARIN                   whois.arin.net                 2003-03
30720-31743    Allocated by RIPE NCC               whois.ripe.net                 2003-09
31744-32767    Allocated by ARIN                   whois.arin.net                 2003-11
32768-33791    Allocated by ARIN                   whois.arin.net                 2004-05
33792-34815    Allocated by RIPE NCC               whois.ripe.net                 2004-06
34816-35839    Allocated by RIPE NCC               whois.ripe.net                 2005-02
35840-36863    Allocated by ARIN                   whois.arin.net                 2005-02
36864-37887    Allocated by AfriNIC                whois.afrinic.net              2005-04
37888-38911    Allocated by APNIC                  whois.apnic.net                2005-06
38912-39935    Allocated by RIPE NCC               whois.ripe.net                 2005-09
39936-40959    Allocated by ARIN                   whois.arin.net                 2006-03-29
40960-41983    Allocated by RIPE NCC               whois.ripe.net                 2006-04-13
41984-43007    Allocated by RIPE NCC               whois.ripe.net                 2006-11-17
43008-44031    Allocated by RIPE NCC               whois.ripe.net                 2007-04-23
44032-45055    Allocated by RIPE NCC               whois.ripe.net                 2007-09-14
45056-46079    Allocated by APNIC                  whois.apnic.net                2007-10-11
46080-54271    Unallocated
54272-64511    Reserved by the IANA
64512-65534    Designated for private use (Allocated to the IANA)
65535          Reserved

Registry Name: 32-bit Autonomous System Numbers
Reference: [RFC4893]
Registration Procedures: RIR request to the IANA

Registry: 32-bit Autonomous System Numbers
Number                 Description                         Whois             Reference  Registration Date
---------------------  ----------------------------------- --------          ---------- -----------------
0.0-0.65535            See Sub-registry 16-bit AS numbers                    [RFC1930]
1.0-1.65535            Reserved
2.0-2.1023             Allocated by APNIC                  whois.apnic.net              2006-11-29
2.1024-2.65535         Unallocated 
3.0-3.1023             Allocated by RIPE NCC               whois.ripe.net               2006-11-29
3.1024-3.65535         Unallocated
4.0-4.1023             Allocated by LACNIC                 whois.lacnic.net             2006-11-29
4.1024-4.65535         Unallocated
5.0-5.1023             Allocated by AfriNIC                whois.afrinic.net            2006-11-29
5.1024-5.65535         Unallocated
6.0-6.1023             Allocated by ARIN                   whois.arin.net               2006-11-30
6.1024-65535.65534     Unallocated
65535.65535            Reserved


References
----------
[RFC1930]  J. Hawkinson and T. Bates, "Guidelines for creation, selection, 
           and registration of an Autonomous System (AS)", RFC 1930,
           March 1996.

[RFC4893]  Q. Vohra, E. Chen, "BGP Support for Four-octet AS 
           Number Space",  RFC 4893, May 2007.


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