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ASN directory

86,901 autonomous systems announce IPv4 or IPv6 routes in the current BGP table, covering 3,133,671,387 IPv4 addresses. Below are the 100 largest by IPv4 address space.

Networks announcing routes86,90179,396 with IPv4, 37,728 with IPv6
Announced IPv4 addresses3,133,671,387in 459,655 contiguous ranges
Held by the 10 largest networks27.9%of announced IPv4 space
Countries240Networks by country
#ASNNetworkCCIPv4 addressesShare
1 AS749 DNIC-AS-00749 - United States Department of Defense (DoD) US 222,038,272 7.09%
2 AS16509 AMAZON-02 - Amazon.com, Inc. US 157,393,150 5.02%
3 AS4134 CHINANET-BACKBONE - No.31,Jin-rong Street CN 99,036,416 3.16%
4 AS7018 ATT-INTERNET4 - AT&T Enterprises, LLC US 90,002,688 2.87%
5 AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation US 80,749,056 2.58%
6 AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone CN 57,221,376 1.83%
7 AS4766 KIXS-AS-KR-KR - Korea Telecom KR 46,382,848 1.48%
8 AS7922 COMCAST-7922 - Comcast Cable Communications, LLC US 42,195,200 1.35%
9 AS701 UUNET - Verizon Business US 40,608,768 1.30%
10 AS17676 GIGAINFRA - SoftBank Corp. JP 38,445,056 1.23%
11 AS3320 DTAG Deutsche Telekom AG DE 34,162,432 1.09%
12 AS721 DNIC-ASBLK-00721-00726 - United States Department of Defense (DoD) US 29,541,376 0.94%
13 AS4713 OCN - NTT DOCOMO BUSINESS,Inc. JP 28,623,360 0.91%
14 AS3356 LEVEL3 - Level 3 Parent, LLC US 27,412,864 0.87%
15 AS174 COGENT-174 - Cogent Communications, LLC US 24,663,935 0.79%
16 AS396982 GOOGLE-CLOUD-PLATFORM - Google LLC US 22,019,072 0.70%
17 AS14618 AMAZON-AES - Amazon.com, Inc. US 21,573,120 0.69%
18 AS3215 AS3215 Orange S.A. FR 20,082,432 0.64%
19 AS3269 ASN-IBSNAZ Telecom Italia S.p.A. IT 19,699,456 0.63%
20 AS6167 CELLCO-PART - Verizon Business US 18,082,816 0.58%
21 AS2516 KDDI - KDDI CORPORATION JP 18,072,320 0.58%
22 AS9808 CHINAMOBILE-CN - China Mobile Communications Group Co., Ltd. CN 17,288,448 0.55%
23 AS714 APPLE-ENGINEERING - Apple Inc. US 16,915,200 0.54%
24 AS31399 DAIMLER-AS Mercedes-Benz Group AG DE 16,805,888 0.54%
25 AS4538 ERX-CERNET-BKB - China Education and Research Network Center CN 16,445,696 0.52%
26 AS15557 LDCOMNET Societe Francaise Du Radiotelephone - SFR SA FR 15,811,072 0.50%
27 AS209 CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC US 15,739,648 0.50%
28 AS9318 SKB-AS-KR - SK Broadband Co Ltd KR 14,994,944 0.48%
29 AS2856 BT-UK-AS British Telecommunications Limited GB 13,859,584 0.44%
30 AS8151 AS8151 - UNINET MX 13,533,184 0.43%
31 AS1221 ASN-TELSTRA - Telstra Limited AU 13,386,240 0.43%
32 AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc. US 13,121,792 0.42%
33 AS22773 ASN-CXA-ALL-CCI-22773-RDC - Cox Communications Inc. US 12,937,472 0.41%
34 AS3209 VODANET Vodafone GmbH DE 12,755,200 0.41%
35 AS20115 CHARTER-20115 - Charter Communications LLC US 12,417,536 0.40%
36 AS22394 CELLCO - Verizon Business US 12,308,992 0.39%
37 AS3462 HINET - Data Communication Business Group TW 12,223,487 0.39%
38 AS7377 UCSD - University of California, San Diego US 12,126,474 0.39%
39 AS26599 AS26599 - TELEFONICA BRASIL S.A BR 10,786,304 0.34%
40 AS5650 FRONTIER-FRTR - Frontier Communications of America, Inc. US 10,665,984 0.34%
41 AS7029 WINDSTREAM - Windstream Communications LLC US 10,421,504 0.33%
42 AS3352 Telefonica_de_EspaNa TELEFONICA DE ESPANA S.A.U. ES 10,382,592 0.33%
43 AS17858 POWERVIS-AS-KR-KR - LG POWERCOMM KR 10,307,072 0.33%
44 AS28573 AS28573 - Claro NXT Telecomunicacoes Ltda BR 9,963,776 0.32%
45 AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd. CN 9,425,920 0.30%
46 AS12389 ROSTELECOM-AS PJSC Rostelecom RU 9,166,848 0.29%
47 AS26615 AS26615 - TIM S/A BR 8,865,024 0.28%
48 AS12322 PROXAD Free SAS FR 8,822,784 0.28%
49 AS2907 SINET-AS - Research Organization of Information and Systems, National Institute of Informatics JP 8,765,504 0.28%
50 AS5089 NTL Virgin Media Limited GB 8,490,496 0.27%
51 AS7303 AS7303 - Telecom Argentina S.A. AR 8,371,200 0.27%
52 AS6805 TDDE-ASN1 Telefonica Germany GmbH & Co.OHG DE 8,351,488 0.27%
53 AS20940 AKAMAI-ASN1 Akamai International B.V. NL 8,198,596 0.26%
54 AS3786 LGDACOM-KR - LG DACOM Corporation KR 8,056,832 0.26%
55 AS4812 CHINANET-SH-AP - China Telecom (Group) CN 7,882,496 0.25%
56 AS56 DNIC-AS-00056 - United States Department of Defense (DoD) US 7,785,728 0.25%
57 AS680 DFN Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. DE 7,676,160 0.24%
58 AS45899 VNPT-AS-VN - VNPT Corp VN 7,645,910 0.24%
59 AS8452 TE-AS - IDDQD-AS EG 7,586,560 0.24%
60 AS1540 DNIC-ASBLK-01534-01546 - Headquarters, USAISC US 7,430,144 0.24%
61 AS10796 TWC-10796-MIDWEST - Charter Communications Inc US 7,405,568 0.24%
62 AS1267 ASN-WINDTRE WIND TRE S.P.A. IT 7,396,352 0.24%
63 AS1136 KPN KPN B.V. NL 7,265,791 0.23%
64 AS20001 TWC-20001-PACWEST - Charter Communications Inc US 7,210,752 0.23%
65 AS1103 SURFNET-NL SURF B.V. NL 7,194,079 0.23%
66 AS4808 CHINA169-BJ - China Unicom Beijing Province Network CN 7,176,704 0.23%
67 AS9644 SKTELECOM-NET-AS-KR - SK Telecom KR 7,128,832 0.23%
68 AS5410 BOUYGTEL-ISP Bouygues Telecom SA FR 7,087,616 0.23%
69 AS12479 UNI2-AS Orange Espagne SA ES 6,999,040 0.22%
70 AS786 JANET Jisc Services Limited GB 6,885,120 0.22%
71 AS577 BACOM - Bell Canada CA 6,860,800 0.22%
72 AS9121 TTNet Turk Telekomunikasyon Anonim Sirketi TR 6,749,440 0.22%
73 AS33915 TNF-AS Vodafone Libertel B.V. NL 6,589,184 0.21%
74 AS2828 XO-AS15 - Verizon Business US 6,535,680 0.21%
75 AS3301 TELIANET-SWEDEN Telia Company AB SE 6,525,696 0.21%
76 AS1257 SWIPNET - Tele2 Sverige AB EU 6,459,648 0.21%
77 AS3561 CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications, LLC US 6,397,952 0.20%
78 AS36992 ETISALAT MISR - ETISALAT MISR EG 6,320,896 0.20%
79 AS45090 TENCENT-NET-AP - Shenzhen Tencent Computer Systems Company Limited CN 6,189,824 0.20%
80 AS9829 BSNL-NIB - National Internet Backbone IN 6,155,520 0.20%
81 AS5607 BSKYB-BROADBAND-AS Sky UK Limited GB 6,089,728 0.19%
82 AS6713 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM - Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM MA 5,923,072 0.19%
83 AS11427 TWC-11427-TEXAS - Charter Communications Inc US 5,789,696 0.18%
84 AS31898 ORACLE-BMC-31898 - Oracle Corporation US 5,754,624 0.18%
85 AS812 ROGERS-COMMUNICATIONS - Rogers Communications Canada Inc. CA 5,753,600 0.18%
86 AS702 UUNET - Verizon Business US 5,716,992 0.18%
87 AS33363 BHN-33363 - Charter Communications, Inc US 5,679,360 0.18%
88 AS30722 VODAFONE-IT-ASN Fastweb SpA IT 5,575,936 0.18%
89 AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd. CN 5,571,840 0.18%
90 AS1659 ERX-TANET-ASN1 - Taiwan Academic Network (TANet) Information Center TW 5,495,808 0.18%
91 AS5617 TPNET Orange Polska Spolka Akcyjna PL 5,478,400 0.17%
92 AS17506 UCOM - ARTERIA Networks Corporation JP 5,382,143 0.17%
93 AS6327 SHAW - Shaw Communications CA 5,308,672 0.17%
94 AS4804 MPX-AS - Microplex PTY LTD AU 5,270,784 0.17%
95 AS3292 TDC TDC Holding A/S DK 5,186,048 0.17%
96 AS4230 AS4230 - CLARO S.A. BR 5,155,584 0.16%
97 AS7552 VIETEL-AS-AP - Viettel Group VN 4,957,692 0.16%
98 AS6128 CABLE-NET-1 - Cablevision Systems Corp. US 4,867,584 0.16%
99 AS2914 NTT-DATA-2914 - NTT America, Inc. US 4,832,292 0.15%
100 AS852 ASN852 - TELUS Communications Inc. CA 4,813,824 0.15%

Largest countries by IPv4 space

United States 43.49%China 9.33%Japan 5.15%Germany 3.62%South Korea 3.43%Brazil 2.40%France 2.27%United Kingdom 2.17%Canada 1.70%Italy 1.65%Netherlands 1.44%Russia 1.39% All countries

What is an ASN?

An autonomous system (AS) is a network, or a group of networks run by one operator, with a single routing policy on the internet. Each one gets an autonomous system number (ASN) from a regional internet registry: ARIN, RIPE NCC, APNIC, LACNIC or AFRINIC. Internet providers, cloud platforms, CDNs, universities and large companies run their own.

Networks tell each other which address blocks they can deliver traffic to with the Border Gateway Protocol (BGP). Each such announcement says "these prefixes are reachable through ASn". The ranges on this site are those announcements, so they show where an address is routed today, which can differ from who the registry lists as the holder.

How to read the numbers

  • IPv4 addresses is the total size of every IPv4 range the ASN announces. A /24 is 256 addresses, a /16 is 65,536.
  • Prefixes are the CIDR blocks that exactly cover those ranges. Adjacent announcements are merged in the source data, so the count can be lower than the raw number of BGP routes.
  • Country is the country the ASN is registered in, not where its servers are. A global CDN registered in the US still shows US.
  • IPv6 space is shown in /48 or /32 blocks, because raw IPv6 address counts are too large to compare.

ASN numbers

ASNs were 16-bit numbers (1 to 65535) until 2007; 32-bit ASNs (up to 4,294,967,295) are now common. AS64512 to AS65534 and AS4200000000 to AS4294967294 are reserved for private use, and AS64496 to AS64511 for documentation, so they should never appear on the public internet. When they do, it is usually a leak.

To find which network an address belongs to, use the ASN lookup. For the registration record of an address block, use IP WHOIS.

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources