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16-Bit Asn Assignment Categories From Iana 2016

Autonomous System (AS) Numbers

Last Updated
2017-12-07
Note
Autonomous System (AS) Numbers are used by various routing protocols. IANA allocates AS Numbers to Regional Internet Registries (RIRs). The RIRs further allocate or assign AS Numbers to network operators in line with RIR policies. The [five RIRs] are: - [AFRINIC] - [APNIC] - [ARIN] - [LACNIC] - [RIPE_NCC] AS Numbers can be obtained from the registry in your region.
Available Formats

XML
HTML
Plain text

Registries included below

16-bit Autonomous System Numbers

Registration Procedure(s)
RIR request to the IANA or IETF Review. Allocated following the Global Policy published at [http://www.icann.org/en/resources/policy/global-addressing].
Reference
[RFC1930][RFC5398][RFC6996][RFC7249]
Available Formats

CSV
NumberDescriptionWHOISRDAPReferenceRegistration Date
0Reserved[RFC7607]
1-6Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
7Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
8-27Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
28Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
29-136Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
137Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
138-172Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
173Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
174-223Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
224Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
225-247Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
248-251Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
252-260Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
261Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
262-277Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
278Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
279-285Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
286Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
287Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
288Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
289-293Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
294Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
295-374Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
375Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
376-377Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
378Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
379-512Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
513Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
514-516Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
517Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
518-527Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
528-529Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
530-539Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
540Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
541-543Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
544Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
545-552Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
553Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
554-558Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
559Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
560-564Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
565Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
566-579Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
580Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
581-589Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
590Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
591-592Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
593Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
594-668Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
669Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
670-675Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
676Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
677-678Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
679-680Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
681Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
682-694Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
695-697Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
698-708Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
709-710Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
711Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
712Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
713-718Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
719Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
720-759Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
760-761Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
762-763Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
764Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
765Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
766Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
767-773Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
774-783Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
784-785Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
786Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
787-788Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
789-790Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
791-1100Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1101-1200Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1201-1202Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1203Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1204Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1205Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1206-1212Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1213Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1214-1220Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1221Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1222-1227Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1228-1232Assigned by AFRINICwhois.afrinic.nethttps://rdap.afrinic.net/rdap/
http://rdap.afrinic.net/rdap/
1233Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1234-1235Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1236Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1237Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1238-1240Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1241Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1242-1247Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1248Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1249Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1250Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1251Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1252Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1253Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1254-1256Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1257Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1258-1266Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1267-1275Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1276-1278Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1279Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1280-1289Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1290Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1291Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1292Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1293-1295Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1296Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1297Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1298Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1299-1309Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1310-1317Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1318Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1319-1341Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1342Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1343-1351Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1352-1353Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1354-1546Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1547-1547Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1548-1652Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1653-1654Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1655-1657Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1658Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1659Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1660-1662Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1663Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1664-1679Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1680Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1681-1703Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1704Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1705-1706Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1707-1726Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1727-1728Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1729Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1730-1731Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1732Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1733-1737Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1738-1739Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1740Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1741Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1742-1747Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1748Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1749-1751Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1752Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1753Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1754-1756Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1757-1758Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1759Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1760-1763Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1764Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1765-1767Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1768-1769Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1770-1771Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1772-1773Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1774Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1775Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1776Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1777-1779Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1780Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1781Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1782-1796Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1797Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1798-1830Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1831Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1832Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1833Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1834Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1835-1837Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1838-1839Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1840Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1841Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1842-1848Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1849-1850Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1851Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
1852Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1853-1854Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1855-1876Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1877-1901Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1902-1903Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1904-1915Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1916Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
1917-1920Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1921-1923Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1924-1925Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1926Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1927-1929Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1930Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1931-1934Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1935-1955Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1956-1959Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1960-1962Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1963-1966Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
1967Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
1968-2003Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2004Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2005-2011Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2012Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2013-2015Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2016-2017Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2018Assigned by AFRINICwhois.afrinic.nethttps://rdap.afrinic.net/rdap/
http://rdap.afrinic.net/rdap/
2019-2025Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2026-2029Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2030-2035Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2036Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2037Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2038-2040Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2041Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2042Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
2043Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2044Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2045Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2046Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2047Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2048Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2049Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2050-2056Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2057-2106Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2107-2136Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2137-2143Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2144Assigned by APNICwhois.apnic.nethttps://rdap.apnic.net/
2145Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2146Assigned by LACNICwhois.lacnic.nethttps://rdap.lacnic.net/rdap/
2147-2148Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
2149-2173Assigned by ARINwhois.arin.nethttps://rdap.arin.net/registry
http://rdap.arin.net/registry
2174-2273Assigned by RIPE NCCwhois.ripe.nethttps://rdap.db.ripe.net/
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Just like IP addresses, ASNs (Autonomous System Numbers) have to be unique on the Internet. The main reason for this is that BGP uses the AS number for its loop prevention mechanism. When BGP learns about a route that has its own AS number in its path then it will be discarded.

Here’s an example:

Above we have three routers, R1 and R3 are using the same AS number. Once R1 sends an update, R2 will accept it but R3 will not since the AS number is the same.

To prevent the above from happening, IANA is in control of the AS numbers (similar to public IP addresses). If you want an AS number for the Internet then you’ll have to request one. They started with 16-bit AS numbers (also called 2-octed AS numbers) that were assigned like this:

  • 0: reserved.
  • 1-64.495: public AS numbers.
  • 64.496 – 64.511 – reserved to use in documentation.
  • 64.512 – 65.534 – private AS numbers.
  • 65.535 – reserved.

The 1-64.495 public AS range is pretty small so there are similar issues to the IPv4 public IP addresses, there aren’t enough numbers. Right now (May 2015) there are only 199 AS numbers left that could be assigned. You can see the current status of available AS numbers here.

To get more AS numbers, an extension has been created that supports 32-bit AS numbers (also called 4-octed AS numbers). This means we have about 4.294.967.296 AS numbers that we can use.

When you request an AS number you’ll have to justify why you need a public AS number. For some organizations, using a private AS number should also be a solution.

Private AS numbers can be used when you are connected to a single AS that uses a public AS number. Here’s an example:

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