AUTONOMOUS SYSTEM NUMBERS The Autonomous System (AS) numbers are used by various routing protocols. AS numbers are allocated to the regional registries by the IANA. These registries are the ARIN , RIPE-NCC , and the AP-NIC . 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 the ARIN 1877 - 1901 Allocated by the RIPE NCC 1902 - 2042 Allocated by the ARIN 2043 Allocated by the RIPE NCC 2044 - 2046 Allocated by the ARIN 2047 Allocated by the RIPE NCC 2048 - 2106 Allocated by the ARIN 2107 - 2136 Allocated by the RIPE NCC 2137 - 2584 Allocated by the ARIN 2585 - 2614 Allocated by the RIPE NCC 2615 - 2772 Allocated by the ARIN 2773 - 2822 Allocated by the RIPE NCC 2823 - 2829 Allocated by the ARIN 2830 - 2879 Allocated by the RIPE NCC 2880 - 3153 Allocated by the ARIN 3154 - 3353 Allocated by the RIPE NCC 3354 - 4607 Allocated by the ARIN 4608 - 4864 Allocated by the AP NIC 4865 - 5376 Allocated by the ARIN 5377 - 5631 Allocated by the RIPE NCC 5632 - 6655 Allocated by the ARIN 6656 - 6911 Allocated by the RIPE NCC 6912 - 7466 Allocated by the ARIN 7467 - 7722 Allocated by the AP NIC 7723 - 8191 Allocated by the ARIN 8192 - 9215 Allocated by the RIPE NCC 9216 - 10239 Allocated by the AP NIC 10240 - 11263 Allocated by the ARIN 11264 - 12287 Allocated by the ARIN 12288 - 13311 Allocated by the RIPE NCC 13312 - 14335 Allocated by the ARIN 14336 - 15359 Allocated by the ARIN 15360 - 16383 Allocated by the RIPE NCC 16384 - 17407 Allocated by the ARIN 17408 - 18431 Allocated by the AP NIC 18432 - 19455 Allocated by the ARIN 19456 - 20479 Allocated by the ARIN 20480 - 32767 Held by the IANA 32768 - 64511 Reserved by the IANA 64512 - 65534 Designated for private use (Allocated to the IANA) 65535 Reserved []