ASN Directory

79,207 Autonomous Systems distilled from our IP intelligence dataset. Browse the largest networks below, pick a country to walk the whole directory, or open any ASN page directly at /asn/<number>.

Top ASNs by IPv4 Space

The badge is how many IPv4 /24 blocks our directory attributes to each network. For the prefixes an AS is announcing right now, open its page.

AS749United States Department of Defense (DoD)
mail.mil
865,162
AS16509Amazon.com, Inc.
amazon.com
612,843
AS4134CHINANET BACKBONE
chinatelecom.com.cn
388,840
AS7018AT&T Enterprises, LLC
att.com
346,994
AS8075Microsoft Corporation
microsoft.com
292,599
AS7922Comcast Cable Communications, LLC
comcast.com
264,257
AS4837CHINA UNICOM China169 Backbone
chinaunicom.cn
223,695
AS4766Korea Telecom
kt.com
177,471
AS701Verizon Business
verizonbusiness.com
153,736
AS17676SoftBank Corp.
softbank.jp
150,175
AS3320Deutsche Telekom AG
telekom.de
133,408
AS721United States Department of Defense (DoD)
mail.mil
115,585
AS4713NTT DOCOMO BUSINESS,Inc.
ntt.com
111,813
AS3356Level 3 Parent, LLC
lumen.com
106,146
AS174Cogent Communications, LLC
cogentco.com
99,774
AS396982Google LLC
google.com
85,949
AS3215Orange S.A.
orange.com
78,401
AS14618Amazon.com, Inc.
amazon.com
78,036
AS3269Telecom Italia S.p.A.
telecomitalia.com
77,895
AS2516KDDI CORPORATION
kddi.com
70,600
AS6167Verizon Business
verizonbusiness.com
70,364
AS9808China Mobile Communications Group Co., Ltd.
10086.cn
67,723
AS4538China Education and Research Network Center
cernet.edu.cn
66,994
AS714Apple Inc.
apple.com
66,095
AS31399Mercedes-Benz Group AG
mercedes-benz.com
65,648
AS15557Societe Francaise Du Radiotelephone - SFR SA
sfr.fr
61,762
AS209CenturyLink Communications, LLC
lumen.com
61,253
AS9318SK Broadband Co Ltd
skbroadband.com
58,645
AS2856British Telecommunications Limited
bt.net
54,089
AS8151Uninet S.A. de C.V.
telmex.com
53,308

Browse by Country

Every country in the directory, most networks first. The number is how many Autonomous Systems are registered there.

United States17,411
Brazil8,026
Russia4,955
India2,996
Indonesia2,936
Germany2,845
Poland2,192
United Kingdom1,892
Australia1,670
Ukraine1,610
Bangladesh1,555
France1,502
Netherlands1,499
Canada1,499
Italy1,090
Argentina1,062
Spain951
Türkiye905
Romania899
Hong Kong869
Japan852
South Korea829
Switzerland730
Bulgaria668
South Africa639
Sweden621
Austria604
Iran591
Czechia568
China558
Vietnam545
Mexico509
Singapore482
Philippines473
Thailand473
New Zealand414
Colombia361
Finland323
Denmark319
Chile313
Pakistan307
Taiwan284
Israel282
Norway278
Malaysia263
Slovenia262
Belgium255
Latvia241
Hungary240
Nigeria229
Kenya228
Greece227
Venezuela210
Kazakhstan208
Ecuador206
Slovakia195
Dominican Republic194
Peru183
Saudi Arabia169
Ireland166
Iraq159
Serbia158
Nepal149
Croatia147
Lebanon146
Lithuania142
Georgia133
Estonia133
Myanmar131
Portugal129
Armenia123
Moldova118
Belarus110
Tanzania107
Uzbekistan105
Luxembourg103
Puerto Rico102
Ghana98
Azerbaijan96
Cambodia93
United Arab Emirates93
Albania91
Paraguay88
Costa Rica81
Cyprus77
Kuwait76
Panama75
Egypt73
Iceland70
Guatemala68
Angola67
Honduras67
North Macedonia62
Kyrgyzstan61
Afghanistan60
Uganda56
Bolivia55
Mongolia50
Jordan47
Bosnia & Herzegovina45
Palestine45
El Salvador41
DR Congo39
Tajikistan39
Kosovo35
Mozambique32
Botswana32
Zimbabwe31
Papua New Guinea28
Bhutan28
Uruguay28
Burkina Faso26
Mauritius26
Malawi25
Laos25
Malta25
Tunisia25
Liechtenstein24
Morocco24
Nicaragua24
Libya24
Sri Lanka23
Rwanda21
Somalia21
Montenegro20
Zambia20
Cameroon20
Qatar19
Côte d’Ivoire18
Oman18
Namibia18
South Sudan17
Bahrain17
Curaçao16
Benin16
Fiji16
Sierra Leone16
Trinidad & Tobago15
Belize15
Maldives15
Guinea15
New Caledonia14
Bermuda13
Senegal13
Seychelles12
Liberia12
Timor-Leste12
Jamaica11
Guam11
Gambia10
Republic of the Congo10
Gibraltar10
Algeria10
Eswatini10
Turkmenistan9
Chad9
Togo9
Syria9
Macao9
Gabon9
Sudan9
Vanuatu8
San Marino8
Burundi8
Grenada8
Réunion8
Bahamas8
Mauritania8
Martinique8
Solomon Islands8
Cape Verde7
Ethiopia7
Niger7
Antigua & Barbuda7
Jersey7
Equatorial Guinea7
U.S. Virgin Islands7
Madagascar7
Isle of Man7
Mali7
Cayman Islands6
Lesotho6
Samoa6
Guadeloupe5
Brunei5
Micronesia5
St. Barthélemy5
Faroe Islands5
Suriname5
Guyana5
Haiti5
Barbados4
French Polynesia4
Caribbean Netherlands4
Comoros4
St. Kitts & Nevis4
Tonga4
St. Lucia4
Åland Islands3
Central African Republic3
Palau3
St. Martin3
Guernsey3
Monaco3
French Guiana3
Nauru3
Djibouti3
Vatican City3
British Virgin Islands3
Kiribati3
Aruba3
Yemen3
Andorra2
St. Vincent & Grenadines2
American Samoa2
Cook Islands2
Dominica2
Guinea-Bissau2
Sint Maarten2
Turks & Caicos Islands2
Cuba2
São Tomé & Príncipe2
Antarctica1
Eritrea1
Tuvalu1
North Korea1
Mayotte1
St. Pierre & Miquelon1
British Indian Ocean Territory1
Marshall Islands1
Svalbard & Jan Mayen1
Niue1
Anguilla1
Wallis & Futuna1
Norfolk Island1
Montserrat1
Tokelau1
Falkland Islands1
Greenland1

What's an ASN?

An Autonomous System Number identifies a single network on the internet — a company, ISP or cloud provider that announces a set of IP prefixes via BGP. When you look up an IP on Lookip, the ASN row tells you who's actually responsible for routing that address.