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 |
|---|
| Afghanistan |  | AF | 37 |
| Aland Islands |  | AX | 0 |
| Albania |  | AL | 13 |
| Algeria |  | DZ | 11 |
| American Samoa |  | AS | 4 |
| Andorra |  | AD | 0 |
| Angola |  | AO | 41 |
| Anguilla |  | AI | 5 |
| Antarctica |  | AQ | 0 |
| Antigua and Barbuda |  | AG | 8 |
| Argentina |  | AR | 522 |
| Armenia |  | AM | 13 |
| Aruba |  | AW | 5 |
| Australia |  | AU | 1497 |
| Austria |  | AT | 146 |
| Azerbaijan |  | AZ | 10 |
| Bahamas |  | BS | 7 |
| Bahrain |  | BH | 3 |
| Bangladesh |  | BD | 360 |
| Barbados |  | BB | 8 |
| Belarus |  | BY | 9 |
| Belgium |  | BE | 99 |
| Belize |  | BZ | 16 |
| Benin |  | BJ | 9 |
| Bermuda |  | BM | 15 |
| Bhutan |  | BT | 7 |
| Bolivia, Plurinational State of |  | BO | 26 |
| Bonaire, Sint Eustatius and Saba |  | BQ | 6 |
| Bosnia and Herzegovina |  | BA | 15 |
| Botswana |  | BW | 17 |
| Bouvet Island |  | BV | 0 |
| Brazil |  | BR | 4179 |
| British Indian Ocean Territory |  | IO | 1 |
| Brunei Darussalam |  | BN | 10 |
| Bulgaria |  | BG | 133 |
| Burkina Faso |  | BF | 7 |
| Burundi |  | BI | 9 |
| Cabo Verde |  | CV | 3 |
| Cambodia |  | KH | 58 |
| Cameroon |  | CM | 14 |
| Canada |  | CA | 1343 |
| Cayman Islands |  | KY | 16 |
| Central African Republic |  | CF | 6 |
| Chad |  | TD | 6 |
| Chile |  | CL | 193 |
| China |  | CN | 446 |
| Christmas Island |  | CX | 0 |
| Cocos (Keeling) Islands |  | CC | 0 |
| Colombia |  | CO | 133 |
| Comoros |  | KM | 1 |
| Congo |  | CG | 11 |
| Congo, The Democratic Republic of The |  | CD | 21 |
| Cook Islands |  | CK | 3 |
| Costa Rica |  | CR | 73 |
| Cote D'ivoire |  | CI | 14 |
| Croatia |  | HR | 35 |
| Cuba |  | CU | 4 |
| Curacao |  | CW | 23 |
| Cyprus |  | CY | 38 |
| Czech Republic |  | CZ | 164 |
| Denmark |  | DK | 80 |
| Djibouti |  | DJ | 4 |
| Dominica |  | DM | 5 |
| Dominican Republic |  | DO | 26 |
| Ecuador |  | EC | 64 |
| Egypt |  | EG | 61 |
| El Salvador |  | SV | 31 |
| Equatorial Guinea |  | GQ | 6 |
| Eritrea |  | ER | 1 |
| Estonia |  | EE | 25 |
| Ethiopia |  | ET | 2 |
| Falkland Islands (Malvinas) |  | FK | 1 |
| Faroe Islands |  | FO | 0 |
| Fiji |  | FJ | 6 |
| Finland |  | FI | 64 |
| France |  | FR | 386 |
| French Guiana |  | GF | 3 |
| French Polynesia |  | PF | 4 |
| Gabon |  | GA | 12 |
| Gambia |  | GM | 7 |
| Georgia |  | GE | 16 |
| Germany |  | DE | 733 |
| Ghana |  | GH | 49 |
| Gibraltar |  | GI | 5 |
| Greece |  | GR | 55 |
| Greenland |  | GL | 0 |
| Grenada |  | GD | 3 |
| Guadeloupe |  | GP | 5 |
| Guam |  | GU | 12 |
| Guatemala |  | GT | 43 |
| Guernsey |  | GG | 3 |
| Guinea |  | GN | 7 |
| Guinea-Bissau |  | GW | 3 |
| Guyana |  | GY | 6 |
| Haiti |  | HT | 8 |
| Holy See |  | VA | 1 |
| Honduras |  | HN | 49 |
| Hong Kong |  | HK | 626 |
| Hungary |  | HU | 57 |
| Iceland |  | IS | 18 |
| India |  | IN | 1353 |
| Indonesia |  | ID | 804 |
| Iran, Islamic Republic of |  | IR | 52 |
| Iraq |  | IQ | 22 |
| Ireland |  | IE | 82 |
| Isle of Man |  | IM | 7 |
| Israel |  | IL | 71 |
| Italy |  | IT | 264 |
| Jamaica |  | JM | 13 |
| Japan |  | JP | 704 |
| Jersey |  | JE | 3 |
| Jordan |  | JO | 7 |
| Kazakhstan |  | KZ | 25 |
| Kenya |  | KE | 81 |
| Kiribati |  | KI | 3 |
| Korea, Democratic People's Republic of |  | KP | 1 |
| Korea, Republic of |  | KR | 772 |
| Kuwait |  | KW | 18 |
| Kyrgyzstan |  | KG | 5 |
| Lao People's Democratic Republic |  | LA | 13 |
| Latvia |  | LV | 69 |
| Lebanon |  | LB | 24 |
| Lesotho |  | LS | 7 |
| Liberia |  | LR | 8 |
| Libya |  | LY | 5 |
| Liechtenstein |  | LI | 7 |
| Lithuania |  | LT | 39 |
| Luxembourg |  | LU | 50 |
| Macao |  | MO | 12 |
| Macedonia, The Former Yugoslav Republic of |  | MK | 12 |
| Madagascar |  | MG | 6 |
| Malawi |  | MW | 8 |
| Malaysia |  | MY | 183 |
| Maldives |  | MV | 5 |
| Mali |  | ML | 4 |
| Malta |  | MT | 9 |
| Marshall Islands |  | MH | 1 |
| Martinique |  | MQ | 3 |
| Mauritania |  | MR | 3 |
| Mauritius |  | MU | 20 |
| Mayotte |  | YT | 1 |
| Mexico |  | MX | 263 |
| Micronesia, Federated States of |  | FM | 4 |
| Moldova, Republic of |  | MD | 41 |
| Monaco |  | MC | 0 |
| Mongolia |  | MN | 36 |
| Montenegro |  | ME | 5 |
| Montserrat |  | MS | 1 |
| Morocco |  | MA | 14 |
| Mozambique |  | MZ | 21 |
| Myanmar |  | MM | 20 |
| Namibia |  | NA | 11 |
| Nauru |  | NR | 3 |
| Nepal |  | NP | 44 |
| Netherlands |  | NL | 379 |
| New Caledonia |  | NC | 11 |
| New Zealand |  | NZ | 377 |
| Nicaragua |  | NI | 30 |
| Niger |  | NE | 11 |
| Nigeria |  | NG | 128 |
| Niue |  | NU | 3 |
| Norfolk Island |  | NF | 1 |
| Northern Mariana Islands |  | MP | 1 |
| Norway |  | NO | 71 |
| Oman |  | OM | 5 |
| Pakistan |  | PK | 105 |
| Palau |  | PW | 4 |
| Palestine, State of |  | PS | 10 |
| Panama |  | PA | 89 |
| Papua New Guinea |  | PG | 16 |
| Paraguay |  | PY | 39 |
| Peru |  | PE | 41 |
| Philippines |  | PH | 279 |
| Pitcairn |  | PN | 0 |
| Poland |  | PL | 638 |
| Portugal |  | PT | 38 |
| Puerto Rico |  | PR | 82 |
| Qatar |  | QA | 8 |
| Reunion |  | RE | 4 |
| Romania |  | RO | 434 |
| Russian Federation |  | RU | 961 |
| Rwanda |  | RW | 14 |
| Saint Barthelemy |  | BL | 4 |
| Saint Helena, Ascension and Tristan Da Cunha |  | SH | 0 |
| Saint Kitts and Nevis |  | KN | 3 |
| Saint Lucia |  | LC | 3 |
| Saint Martin (French Part) |  | MF | 6 |
| Saint Pierre and Miquelon |  | PM | 1 |
| Saint Vincent and The Grenadines |  | VC | 4 |
| Samoa |  | WS | 7 |
| San Marino |  | SM | 6 |
| Sao Tome and Principe |  | ST | 2 |
| Saudi Arabia |  | SA | 35 |
| Senegal |  | SN | 6 |
| Serbia |  | RS | 31 |
| Seychelles |  | SC | 14 |
| Sierra Leone |  | SL | 10 |
| Singapore |  | SG | 440 |
| Sint Maarten (Dutch Part) |  | SX | 3 |
| Slovakia |  | SK | 38 |
| Slovenia |  | SI | 87 |
| Solomon Islands |  | SB | 5 |
| Somalia |  | SO | 14 |
| South Africa |  | ZA | 303 |
| South Georgia and The South Sandwich Islands |  | GS | 0 |
| South Sudan |  | SS | 8 |
| Spain |  | ES | 248 |
| Sri Lanka |  | LK | 15 |
| Sudan |  | SD | 8 |
| Suriname |  | SR | 5 |
| Svalbard and Jan Mayen |  | SJ | 0 |
| Swaziland |  | SZ | 7 |
| Sweden |  | SE | 222 |
| Switzerland |  | CH | 234 |
| Syrian Arab Republic |  | SY | 3 |
| Taiwan, Province of China |  | TW | 172 |
| Tajikistan |  | TJ | 4 |
| Tanzania, United Republic of |  | TZ | 68 |
| Thailand |  | TH | 325 |
| Timor-Leste |  | TL | 7 |
| Togo |  | TG | 5 |
| Tokelau |  | TK | 2 |
| Tonga |  | TO | 4 |
| Trinidad and Tobago |  | TT | 18 |
| Tunisia |  | TN | 14 |
| Turkey |  | TR | 99 |
| Turkmenistan |  | TM | 0 |
| Turks and Caicos Islands |  | TC | 4 |
| Tuvalu |  | TV | 2 |
| Uganda |  | UG | 34 |
| Ukraine |  | UA | 420 |
| United Arab Emirates |  | AE | 32 |
| United Kingdom |  | GB | 816 |
| United States |  | US | 17219 |
| United States Minor Outlying Islands |  | UM | 0 |
| Uruguay |  | UY | 28 |
| Uzbekistan |  | UZ | 13 |
| Vanuatu |  | VU | 8 |
| Venezuela, Bolivarian Republic of |  | VE | 57 |
| Viet Nam |  | VN | 215 |
| Virgin Islands, British |  | VG | 14 |
| Virgin Islands, U.S. |  | VI | 7 |
| Wallis and Futuna |  | WF | 2 |
| Yemen |  | YE | 4 |
| Zambia |  | ZM | 22 |
| Zimbabwe |  | ZW | 16 |
