IP & network
Find an autonomous system by number or organisation name: all its IPv4 and IPv6 networks, countries and a ready-made prefix list for firewalls.
| AS | Organisation | IPv4 addresses |
|---|---|---|
| AS749 |  United States Department of Defense (DoD) | 205,760,000 |
| AS16509 | Amazon.com, Inc. | 156,962,048 |
| AS4134 |  Chinanet | 97,428,714 |
| AS7018 | AT&T Enterprises, LLC | 89,915,584 |
| AS8075 | Microsoft Corporation | 80,738,304 |
| AS7922 | Comcast Cable Communications, LLC | 67,778,304 |
| AS4837 | CHINA UNICOM China169 Backbone | 56,900,772 |
| AS4766 |  Korea Telecom | 46,345,056 |
| AS701 | Verizon Business | 40,580,064 |
| AS17676 |  SoftBank Corp. | 37,527,552 |
| AS3320 |  Deutsche Telekom AG | 34,157,568 |
| AS4713 | NTT Communications Corporation | 28,623,872 |
| AS721 | DoD Network Information Center | 28,432,896 |
| AS3356 | Level 3 Communications, Inc. | 27,456,516 |
| AS174 | Cogent Communications | 24,525,584 |
| AS396982 | Google LLC | 21,963,008 |
| AS14618 | Amazon.com, Inc. | 21,566,208 |
| AS3215 |  Orange S.A. | 20,081,408 |
| AS3269 |  Telecom Italia S.p.A. | 19,828,480 |
| AS9808 | China Mobile Communications Group Co., Ltd | 18,072,300 |
| AS2516 | KDDI CORPORATION | 18,071,808 |
| AS6167 | Verizon Business | 17,976,320 |
| AS714 | Apple Inc. | 16,915,200 |
| AS31399 | Mercedes-Benz Group AG | 16,805,888 |
| AS4538 | China Education and Research Network Center | 16,287,744 |
| AS15557 | Societe Francaise Du Radiotelephone - SFR SA | 15,811,072 |
| AS209 | CenturyLink Communications, LLC | 15,665,064 |
| AS9318 | SK Broadband Co Ltd | 15,000,064 |
| AS2856 |  British Telecommunications PLC | 13,845,504 |
| AS8151 |  Uninet S.A. de C.V. | 13,500,928 |
| AS1221 |  Telstra Limited | 13,387,776 |
| AS21928 | T-Mobile USA, Inc. | 13,120,000 |
| AS22773 | Cox Communications Inc. | 12,847,872 |
| AS3209 | Vodafone GmbH | 12,758,528 |
| AS20115 | Charter Communications | 12,417,792 |
| AS22394 | Verizon Business | 12,415,488 |
| AS3462 |  Chunghwa Telecom Co., Ltd. | 12,221,440 |
| AS7377 | University of California, San Diego | 12,129,792 |
| AS26599 |  TELEFONICA BRASIL S.A | 10,718,464 |
| AS5650 | Verizon Business | 10,651,392 |
| AS17858 | LG POWERCOMM | 10,503,680 |
| AS3352 |  TELEFONICA DE ESPANA S.A.U. | 10,382,592 |
| AS7029 | Windstream Communications LLC | 10,363,648 |
| AS28573 | Claro NXT Telecomunicacoes Ltda | 9,953,024 |
| AS37963 | Hangzhou Alibaba Advertising Co.,Ltd. | 9,426,688 |
| AS12389 |  PJSC Rostelecom | 9,169,408 |
| AS26615 | TIM S/A | 9,110,720 |
| AS12322 | Free SAS | 8,822,784 |
| AS2907 | Research Organization of Information and Systems, National Institute of Informa | 8,769,536 |
| AS5089 | Virgin Media Limited | 8,493,312 |
| AS7303 |  Telecom Argentina S.A. | 8,371,456 |
| AS6805 | Telefonica Germany GmbH & Co.OHG | 8,351,488 |
| AS20940 | Akamai International B.V. | 8,186,112 |
| AS3786 | LG DACOM Corporation | 7,847,168 |
| AS56 | United States Department of Defense (DoD) | 7,774,720 |
| AS4812 | China Telecom (Group) | 7,761,344 |
| AS680 | Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. | 7,670,784 |
| AS45899 |  VNPT Corp | 7,605,504 |
| AS8452 |  TE-AS | 7,586,048 |
| AS10796 | Charter Communications Inc | 7,409,660 |
| AS1267 | WIND TRE S.P.A. | 7,396,352 |
| AS4808 | China Unicom Beijing Province Network | 7,337,177 |
| AS1136 |  KPN B.V. | 7,265,792 |
| AS20001 | Charter Communications Inc | 7,215,616 |
| AS9644 | SK Telecom | 7,128,832 |
| AS5410 | Bouygues Telecom SA | 7,087,616 |
| AS12479 | Orange Espagne SA | 6,995,012 |
| AS786 | Jisc Services Limited | 6,886,144 |
| AS577 |  Bell Canada | 6,863,616 |
| AS9121 |  Turk Telekomunikasyon Anonim Sirketi | 6,749,440 |
| AS1103 | SURF B.V. | 6,665,984 |
| AS33915 | Vodafone Libertel B.V. | 6,588,928 |
| AS2828 | Verizon Business | 6,532,864 |
| AS3301 |  Telia Company AB | 6,525,696 |
| AS1257 | Tele2 Sverige AB | 6,458,880 |
| AS3561 | CenturyLink Communications, LLC | 6,361,088 |
| AS36992 | ETISALAT MISR | 6,318,848 |
| AS1540 | Headquarters, USAISC | 6,303,232 |
| AS45090 | Shenzhen Tencent Computer Systems Company Limited | 6,171,904 |
| AS9829 |  Bharat Sanchar Nigam Ltd | 6,129,801 |
| AS5607 | Sky UK Limited | 6,089,728 |
| AS6713 |  Itissalat Al-MAGHRIB | 5,951,488 |
| AS33363 | Charter Communications, Inc | 5,811,712 |
| AS11427 | Charter Communications Inc | 5,791,744 |
| AS702 | Verizon Business | 5,716,480 |
| AS812 | Rogers Communications Canada Inc. | 5,673,984 |
| AS30722 | Fastweb SpA | 5,573,888 |
| AS31898 | Oracle Corporation | 5,562,368 |
| AS45102 |  Alibaba (US) Technology Co., Ltd. | 5,535,744 |
| AS1659 | Taiwan Academic Network (TANet) Information Center | 5,495,296 |
| AS5617 |  Orange Polska Spolka Akcyjna | 5,478,400 |
| AS17506 | ARTERIA Networks Corporation | 5,382,144 |
| AS6327 | Shaw Communications | 5,307,648 |
| AS4804 | SingTel Optus Pty Ltd | 5,270,784 |
| AS3292 |  TDC Holding A/S | 5,188,608 |
| AS7552 | Viettel Group | 4,983,808 |
| AS6128 | Cablevision Systems Corp. | 4,865,280 |
| AS852 | TELUS Communications Inc. | 4,813,568 |
| AS4230 | CLARO S.A. | 4,769,024 |
| AS2914 | NTT America, Inc. | 4,750,848 |
An AS number tells you which organisation an IP address belongs to and what other networks it has. That helps to allow every server of a service, block traffic from a hosting network, debug BGP routing, or identify the provider behind an address in your logs.