An autonomous system number (ASN) is a unique number assigned to an autonomous system (AS) by the Internet Assigned Numbers Authority (IANA).
An AS consists of blocks of IP addresses which have a distinctly defined policy for accessing external networks and are administered by a single organization but may be made up of several operators.
Below you will find a list of public ASN's listed by country.
| Country | Flag | Country Code | ASN's |
|---|
| Andorra |  | AD | 51 |
| United Arab Emirates |  | AE | 963 |
| Afghanistan |  | AF | 434 |
| Antigua and Barbuda |  | AG | 128 |
| Anguilla |  | AI | 42 |
| Albania |  | AL | 630 |
| Armenia |  | AM | 494 |
| Angola |  | AO | 323 |
| Antarctica |  | AQ | 1 |
| Argentina |  | AR | 12847 |
| American Samoa |  | AS | 25 |
| Austria |  | AT | 2841 |
| Australia |  | AU | 23534 |
| Aruba |  | AW | 121 |
| Aland Islands |  | AX | 27 |
| Azerbaijan |  | AZ | 842 |
| Bosnia and Herzegovina |  | BA | 730 |
| Barbados |  | BB | 386 |
| Bangladesh |  | BD | 5152 |
| Belgium |  | BE | 2450 |
| Burkina Faso |  | BF | 173 |
| Bulgaria |  | BG | 7311 |
| Bahrain |  | BH | 751 |
| Burundi |  | BI | 97 |
| Benin |  | BJ | 179 |
| Saint Barthelemy |  | BL | 5 |
| Bermuda |  | BM | 244 |
| Brunei Darussalam |  | BN | 244 |
| Bolivia, Plurinational State of |  | BO | 797 |
| Bonaire, Sint Eustatius and Saba |  | BQ | 39 |
| Brazil |  | BR | 41907 |
| Bahamas |  | BS | 111 |
| Bhutan |  | BT | 38 |
| Botswana |  | BW | 257 |
| Belarus |  | BY | 1269 |
| Belize |  | BZ | 182 |
| Canada |  | CA | 27285 |
| Congo, The Democratic Republic of The |  | CD | 230 |
| Central African Republic |  | CF | 17 |
| Congo |  | CG | 122 |
| Switzerland |  | CH | 4319 |
| Cote Divoire |  | CI | 828 |
| Cook Islands |  | CK | 30 |
| Chile |  | CL | 5290 |
| Cameroon |  | CM | 431 |
| China |  | CN | 50582 |
| Colombia |  | CO | 8844 |
| Costa Rica |  | CR | 4516 |
| Cuba |  | CU | 37 |
| Cabo Verde |  | CV | 21 |
| Curacao |  | CW | 231 |
| Cyprus |  | CY | 999 |
| Czech Republic |  | CZ | 2269 |
| Germany |  | DE | 21291 |
| Djibouti |  | DJ | 93 |
| Denmark |  | DK | 1964 |
| Dominica |  | DM | 51 |
| Dominican Republic |  | DO | 999 |
| Algeria |  | DZ | 607 |
| Ecuador |  | EC | 3750 |
| Estonia |  | EE | 666 |
| Egypt |  | EG | 5626 |
| Eritrea |  | ER | 6 |
| Spain |  | ES | 18188 |
| Ethiopia |  | ET | 192 |
| Finland |  | FI | 2435 |
| Fiji |  | FJ | 140 |
| Falkland Islands (Malvinas) |  | FK | 11 |
| Micronesia, Federated States of |  | FM | 14 |
| Faroe Islands |  | FO | 14 |
| France |  | FR | 10283 |
| Gabon |  | GA | 193 |
| United Kingdom |  | GB | 19014 |
| Grenada |  | GD | 65 |
| Georgia |  | GE | 495 |
| French Guiana |  | GF | 22 |
| Guernsey |  | GG | 99 |
| Ghana |  | GH | 620 |
| Gibraltar |  | GI | 156 |
| Greenland |  | GL | 19 |
| Gambia |  | GM | 68 |
| Guinea |  | GN | 73 |
| Guadeloupe |  | GP | 51 |
| Equatorial Guinea |  | GQ | 37 |
| Greece |  | GR | 1377 |
| Guatemala |  | GT | 747 |
| Guam |  | GU | 94 |
| Guinea-Bissau |  | GW | 8 |
| Guyana |  | GY | 87 |
| Hong Kong |  | HK | 17759 |
| Honduras |  | HN | 821 |
| Croatia |  | HR | 624 |
| Haiti |  | HT | 217 |
| Hungary |  | HU | 1898 |
| Indonesia |  | ID | 14525 |
| Ireland |  | IE | 1506 |
| Israel |  | IL | 5590 |
| Isle of Man |  | IM | 133 |
| India |  | IN | 41373 |
| British Indian Ocean Territory |  | IO | 3 |
| Iraq |  | IQ | 1564 |
| Iran, Islamic Republic of |  | IR | 6724 |
| Iceland |  | IS | 306 |
| Italy |  | IT | 7933 |
| Jersey |  | JE | 119 |
| Jamaica |  | JM | 454 |
| Jordan |  | JO | 1324 |
| Japan |  | JP | 14635 |
| Kenya |  | KE | 1536 |
| Kyrgyzstan |  | KG | 351 |
| Cambodia |  | KH | 1347 |
| Kiribati |  | KI | 19 |
| Comoros |  | KM | 14 |
| Saint Kitts and Nevis |  | KN | 51 |
| Korea, Democratic Peoples Republic of |  | KP | 4 |
| Korea, Republic of |  | KR | 33310 |
| Kuwait |  | KW | 2161 |
| Cayman Islands |  | KY | 100 |
| Kazakhstan |  | KZ | 3861 |
| Lao Peoples Democratic Republic |  | LA | 251 |
| Lebanon |  | LB | 1617 |
| Saint Lucia |  | LC | 80 |
| Liechtenstein |  | LI | 74 |
| Sri Lanka |  | LK | 470 |
| Liberia |  | LR | 69 |
| Lesotho |  | LS | 66 |
| Lithuania |  | LT | 1599 |
| Luxembourg |  | LU | 652 |
| Latvia |  | LV | 1203 |
| Libya |  | LY | 302 |
| Morocco |  | MA | 1759 |
| Monaco |  | MC | 57 |
| Moldova, Republic of |  | MD | 757 |
| Montenegro |  | ME | 114 |
| Saint Martin (French Part) |  | MF | 31 |
| Madagascar |  | MG | 208 |
| Marshall Islands |  | MH | 17 |
| North Macedonia |  | MK | 702 |
| Mali |  | ML | 80 |
| Myanmar |  | MM | 480 |
| Mongolia |  | MN | 414 |
| Macao |  | MO | 147 |
| Northern Mariana Islands |  | MP | 36 |
| Martinique |  | MQ | 44 |
| Mauritania |  | MR | 53 |
| Montserrat |  | MS | 9 |
| Malta |  | MT | 447 |
| Mauritius |  | MU | 880 |
| Maldives |  | MV | 219 |
| Malawi |  | MW | 234 |
| Mexico |  | MX | 19029 |
| Malaysia |  | MY | 3016 |
| Mozambique |  | MZ | 722 |
| Namibia |  | NA | 140 |
| New Caledonia |  | NC | 91 |
| Niger |  | NE | 74 |
| Norfolk Island |  | NF | 7 |
| Nigeria |  | NG | 2257 |
| Nicaragua |  | NI | 526 |
| Netherlands |  | NL | 10707 |
| Norway |  | NO | 1649 |
| Nepal |  | NP | 728 |
| Nauru |  | NR | 13 |
| Niue |  | NU | 5 |
| New Zealand |  | NZ | 3898 |
| Oman |  | OM | 757 |
| Panama |  | PA | 1393 |
| Peru |  | PE | 3151 |
| French Polynesia |  | PF | 236 |
| Papua New Guinea |  | PG | 157 |
| Philippines |  | PH | 4909 |
| Pakistan |  | PK | 5709 |
| Poland |  | PL | 7799 |
| Saint Pierre and Miquelon |  | PM | 18 |
| Puerto Rico |  | PR | 1806 |
| Palestine, State of |  | PS | 1051 |
| Portugal |  | PT | 800 |
| Palau |  | PW | 5 |
| Paraguay |  | PY | 559 |
| Qatar |  | QA | 428 |
| Reunion |  | RE | 59 |
| Romania |  | RO | 6897 |
| Serbia |  | RS | 1694 |
| Russian Federation |  | RU | 36990 |
| Rwanda |  | RW | 238 |
| Saudi Arabia |  | SA | 7447 |
| Solomon Islands |  | SB | 43 |
| Seychelles |  | SC | 194 |
| Sudan |  | SD | 556 |
| Sweden |  | SE | 6543 |
| Singapore |  | SG | 7716 |
| Slovenia |  | SI | 663 |
| Slovakia |  | SK | 906 |
| Sierra Leone |  | SL | 152 |
| San Marino |  | SM | 103 |
| Senegal |  | SN | 229 |
| Somalia |  | SO | 99 |
| Suriname |  | SR | 218 |
| South Sudan |  | SS | 42 |
| Sao Tome and Principe |  | ST | 6 |
| El Salvador |  | SV | 1091 |
| Sint Maarten (Dutch Part) |  | SX | 61 |
| Syrian Arab Republic |  | SY | 286 |
| Eswatini |  | SZ | 52 |
| Turks and Caicos Islands |  | TC | 38 |
| Chad |  | TD | 41 |
| Togo |  | TG | 80 |
| Thailand |  | TH | 9946 |
| Tajikistan |  | TJ | 200 |
| Tokelau |  | TK | 12 |
| Timor-Leste |  | TL | 59 |
| Turkmenistan |  | TM | 21 |
| Tunisia |  | TN | 725 |
| Tonga |  | TO | 20 |
| Turkey |  | TR | 16614 |
| Trinidad and Tobago |  | TT | 376 |
| Tuvalu |  | TV | 10 |
| Taiwan, Province of China |  | TW | 7568 |
| Tanzania, United Republic of |  | TZ | 653 |
| Ukraine |  | UA | 11359 |
| Uganda |  | UG | 640 |
| United States Minor Outlying Islands |  | UM | 2 |
| United States |  | US | 323849 |
| Uruguay |  | UY | 803 |
| Uzbekistan |  | UZ | 323 |
| Holy See |  | VA | 5 |
| Saint Vincent and The Grenadines |  | VC | 47 |
| Venezuela, Bolivarian Republic of |  | VE | 1949 |
| Virgin Islands, British |  | VG | 142 |
| Virgin Islands, U.S. |  | VI | 121 |
| Viet Nam |  | VN | 10595 |
| Vanuatu |  | VU | 55 |
| Wallis and Futuna |  | WF | 15 |
| Samoa |  | WS | 61 |
| Yemen |  | YE | 119 |
| Mayotte |  | YT | 4 |
| South Africa |  | ZA | 6710 |
| Zambia |  | ZM | 264 |
| Zimbabwe |  | ZW | 295 |