AUTONOMOUS SYSTEM NUMBERS (last updated 2007-06-21) The Autonomous System (AS) numbers are used by various routing protocols. AS numbers are allocated to the regional registries by the IANA. AfriNIC APNIC ARIN LACNIC RIPE-NCC AS Numbers can be obtained from the registry in your region. Listed below are the allocated blocks to the regional registries. Number Description -------------- ------------------------------------------------------------- 0 Reserved - May be use to identify non-routed networks 1 - 1876 Allocated by ARIN 1877 - 1901 Allocated by RIPE NCC 1902 - 2042 Allocated by ARIN 2043 Allocated by RIPE NCC 2044 - 2046 Allocated by ARIN 2047 Allocated by RIPE NCC 2048 - 2106 Allocated by ARIN 2107 - 2136 Allocated by RIPE NCC 2137 - 2584 Allocated by ARIN 2585 - 2614 Allocated by RIPE NCC 2615 - 2772 Allocated by ARIN 2773 - 2822 Allocated by RIPE NCC 2823 - 2829 Allocated by ARIN 2830 - 2879 Allocated by RIPE NCC 2880 - 3153 Allocated by ARIN 3154 - 3353 Allocated by RIPE NCC 3354 - 4607 Allocated by ARIN 4608 - 4864 Allocated by APNIC 4865 - 5376 Allocated by ARIN 5377 - 5631 Allocated by RIPE NCC 5632 - 6655 Allocated by ARIN 6656 - 6911 Allocated by RIPE NCC 6912 - 7466 Allocated by ARIN 7467 - 7722 Allocated by APNIC 7723 - 8191 Allocated by ARIN 8192 - 9215 Allocated by RIPE NCC 9216 - 10239 Allocated by APNIC 10240 - 11263 Allocated by ARIN 11264 - 12287 Allocated by ARIN 12288 - 13311 Allocated by RIPE NCC 13312 - 14335 Allocated by ARIN 14336 - 15359 Allocated by ARIN 15360 - 16383 Allocated by RIPE NCC 16384 - 17407 Allocated by ARIN 17408 - 18431 Allocated by APNIC 18432 - 19455 Allocated by ARIN 19456 - 20479 Allocated by ARIN 20480 - 21503 Allocated by RIPE NCC 21504 - 22527 Allocated by ARIN 22528 - 23551 Allocated by ARIN 23552 - 24575 Allocated by APNIC 24576 - 25599 Allocated by RIPE NCC 25600 - 26623 Allocated by ARIN (March 2002) 26624 - 27647 Allocated by ARIN (September 2002) 27648 - 28671 Allocated by LACNIC (November 2002) 28672 - 29695 Allocated by RIPE NCC (December 2002) 29696 - 30719 Allocated by ARIN (March 2003) 30720 - 31743 Allocated by RIPE NCC (September 2003) 31744 - 32767 Allocated by ARIN (November 2003) 32768 - 33791 Allocated by ARIN (May 2004) 33792 - 34815 Allocated by RIPE NCC (June 2004) 34816 - 35839 Allocated by RIPE NCC (February 2005) 35840 - 36863 Allocated by ARIN (February 2005) 36864 - 37887 Allocated by AfriNIC (April 2005) 37888 - 38911 Allocated by APNIC (June 2005) 38912 - 39935 Allocated by RIPE NCC (September 2005) 39936 - 40959 Allocated by ARIN (29 March 2006) 40960 - 41983 Allocated by RIPE NCC (13 April 2006) 41984 - 43007 Allocated by RIPE NCC (17 November 2006) 43008 - 44031 Allocated by RIPE NCC (23 April 2007) 44032 - 54271 Unallocated 54272 - 64511 Reserved by the IANA 64512 - 65534 Designated for private use (Allocated to the IANA) 65535 Reserved Specially designated Autonomous System Numbers: 23456 AS_TRANS [RFC4893] Registry Expansion - per [RFC4893] 1.0 - 1.65535 Reserved 2.0 - 2.1023 Allocated by APNIC (29 November 2006) 2.1024 - 2.65535 Unallocated 3.0 - 3.1023 Allocated by RIPE NCC (29 November 2006) 3.1024 - 3.65535 Unallocated 4.0 - 4.1023 Allocated by LACNIC (29 November 2006) 4.1024 - 4.65535 Unallocated 5.0 - 5.1023 Allocated by AfriNIC (29 November 2006) 5.1024 - 5.65535 Unallocated 6.0 - 6.1023 Allocated by ARIN (30 November 2006) 6.1024 - 65535.65534 Unallocated 65535.65535 Reserved Reference --------- [RFC4893] Q. Vohra, E. Chen, "BGP Support for Four-octet AS Number Space", RFC 4893, May 2007. []