What Is An ASN?

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.

CountryFlagCountry CodeASN's
AfghanistanAfghanistan Flag AF37
Aland IslandsAland Islands Flag AX0
AlbaniaAlbania Flag AL13
AlgeriaAlgeria Flag DZ11
American SamoaAmerican Samoa Flag AS4
AndorraAndorra Flag AD0
AngolaAngola Flag AO41
AnguillaAnguilla Flag AI5
AntarcticaAntarctica Flag AQ0
Antigua and BarbudaAntigua and Barbuda Flag AG8
ArgentinaArgentina Flag AR522
ArmeniaArmenia Flag AM13
ArubaAruba Flag AW5
AustraliaAustralia Flag AU1497
AustriaAustria Flag AT146
AzerbaijanAzerbaijan Flag AZ10
BahamasBahamas Flag BS7
BahrainBahrain Flag BH3
BangladeshBangladesh Flag BD360
BarbadosBarbados Flag BB8
BelarusBelarus Flag BY9
BelgiumBelgium Flag BE99
BelizeBelize Flag BZ16
BeninBenin Flag BJ9
BermudaBermuda Flag BM15
BhutanBhutan Flag BT7
Bolivia, Plurinational State ofBolivia, Plurinational State of Flag BO26
Bonaire, Sint Eustatius and SabaBonaire, Sint Eustatius and Saba Flag BQ6
Bosnia and HerzegovinaBosnia and Herzegovina Flag BA15
BotswanaBotswana Flag BW17
Bouvet IslandBouvet Island Flag BV0
BrazilBrazil Flag BR4179
British Indian Ocean TerritoryBritish Indian Ocean Territory Flag IO1
Brunei DarussalamBrunei Darussalam Flag BN10
BulgariaBulgaria Flag BG133
Burkina FasoBurkina Faso Flag BF7
BurundiBurundi Flag BI9
Cabo VerdeCabo Verde Flag CV3
CambodiaCambodia Flag KH58
CameroonCameroon Flag CM14
CanadaCanada Flag CA1343
Cayman IslandsCayman Islands Flag KY16
Central African RepublicCentral African Republic Flag CF6
ChadChad Flag TD6
ChileChile Flag CL193
ChinaChina Flag CN446
Christmas IslandChristmas Island Flag CX0
Cocos (Keeling) IslandsCocos (Keeling) Islands Flag CC0
ColombiaColombia Flag CO133
ComorosComoros Flag KM1
CongoCongo Flag CG11
Congo, The Democratic Republic of TheCongo, The Democratic Republic of The Flag CD21
Cook IslandsCook Islands Flag CK3
Costa RicaCosta Rica Flag CR73
Cote D'ivoireCote D'ivoire Flag CI14
CroatiaCroatia Flag HR35
CubaCuba Flag CU4
CuracaoCuracao Flag CW23
CyprusCyprus Flag CY38
Czech RepublicCzech Republic Flag CZ164
DenmarkDenmark Flag DK80
DjiboutiDjibouti Flag DJ4
DominicaDominica Flag DM5
Dominican RepublicDominican Republic Flag DO26
EcuadorEcuador Flag EC64
EgyptEgypt Flag EG61
El SalvadorEl Salvador Flag SV31
Equatorial GuineaEquatorial Guinea Flag GQ6
EritreaEritrea Flag ER1
EstoniaEstonia Flag EE25
EthiopiaEthiopia Flag ET2
Falkland Islands (Malvinas)Falkland Islands (Malvinas) Flag FK1
Faroe IslandsFaroe Islands Flag FO0
FijiFiji Flag FJ6
FinlandFinland Flag FI64
FranceFrance Flag FR386
French GuianaFrench Guiana Flag GF3
French PolynesiaFrench Polynesia Flag PF4
GabonGabon Flag GA12
GambiaGambia Flag GM7
GeorgiaGeorgia Flag GE16
GermanyGermany Flag DE733
GhanaGhana Flag GH49
GibraltarGibraltar Flag GI5
GreeceGreece Flag GR55
GreenlandGreenland Flag GL0
GrenadaGrenada Flag GD3
GuadeloupeGuadeloupe Flag GP5
GuamGuam Flag GU12
GuatemalaGuatemala Flag GT43
GuernseyGuernsey Flag GG3
GuineaGuinea Flag GN7
Guinea-BissauGuinea-Bissau Flag GW3
GuyanaGuyana Flag GY6
HaitiHaiti Flag HT8
Holy SeeHoly See Flag VA1
HondurasHonduras Flag HN49
Hong KongHong Kong Flag HK626
HungaryHungary Flag HU57
IcelandIceland Flag IS18
IndiaIndia Flag IN1353
IndonesiaIndonesia Flag ID804
Iran, Islamic Republic ofIran, Islamic Republic of Flag IR52
IraqIraq Flag IQ22
IrelandIreland Flag IE82
Isle of ManIsle of Man Flag IM7
IsraelIsrael Flag IL71
ItalyItaly Flag IT264
JamaicaJamaica Flag JM13
JapanJapan Flag JP704
JerseyJersey Flag JE3
JordanJordan Flag JO7
KazakhstanKazakhstan Flag KZ25
KenyaKenya Flag KE81
KiribatiKiribati Flag KI3
Korea, Democratic People's Republic ofKorea, Democratic People's Republic of Flag KP1
Korea, Republic ofKorea, Republic of Flag KR772
KuwaitKuwait Flag KW18
KyrgyzstanKyrgyzstan Flag KG5
Lao People's Democratic RepublicLao People's Democratic Republic Flag LA13
LatviaLatvia Flag LV69
LebanonLebanon Flag LB24
LesothoLesotho Flag LS7
LiberiaLiberia Flag LR8
LibyaLibya Flag LY5
LiechtensteinLiechtenstein Flag LI7
LithuaniaLithuania Flag LT39
LuxembourgLuxembourg Flag LU50
MacaoMacao Flag MO12
Macedonia, The Former Yugoslav Republic ofMacedonia, The Former Yugoslav Republic of Flag MK12
MadagascarMadagascar Flag MG6
MalawiMalawi Flag MW8
MalaysiaMalaysia Flag MY183
MaldivesMaldives Flag MV5
MaliMali Flag ML4
MaltaMalta Flag MT9
Marshall IslandsMarshall Islands Flag MH1
MartiniqueMartinique Flag MQ3
MauritaniaMauritania Flag MR3
MauritiusMauritius Flag MU20
MayotteMayotte Flag YT1
MexicoMexico Flag MX263
Micronesia, Federated States ofMicronesia, Federated States of Flag FM4
Moldova, Republic ofMoldova, Republic of Flag MD41
MonacoMonaco Flag MC0
MongoliaMongolia Flag MN36
MontenegroMontenegro Flag ME5
MontserratMontserrat Flag MS1
MoroccoMorocco Flag MA14
MozambiqueMozambique Flag MZ21
MyanmarMyanmar Flag MM20
NamibiaNamibia Flag NA11
NauruNauru Flag NR3
NepalNepal Flag NP44
NetherlandsNetherlands Flag NL379
New CaledoniaNew Caledonia Flag NC11
New ZealandNew Zealand Flag NZ377
NicaraguaNicaragua Flag NI30
NigerNiger Flag NE11
NigeriaNigeria Flag NG128
NiueNiue Flag NU3
Norfolk IslandNorfolk Island Flag NF1
Northern Mariana IslandsNorthern Mariana Islands Flag MP1
NorwayNorway Flag NO71
OmanOman Flag OM5
PakistanPakistan Flag PK105
PalauPalau Flag PW4
Palestine, State ofPalestine, State of Flag PS10
PanamaPanama Flag PA89
Papua New GuineaPapua New Guinea Flag PG16
ParaguayParaguay Flag PY39
PeruPeru Flag PE41
PhilippinesPhilippines Flag PH279
PitcairnPitcairn Flag PN0
PolandPoland Flag PL638
PortugalPortugal Flag PT38
Puerto RicoPuerto Rico Flag PR82
QatarQatar Flag QA8
ReunionReunion Flag RE4
RomaniaRomania Flag RO434
Russian FederationRussian Federation Flag RU961
RwandaRwanda Flag RW14
Saint BarthelemySaint Barthelemy Flag BL4
Saint Helena, Ascension and Tristan Da CunhaSaint Helena, Ascension and Tristan Da Cunha Flag SH0
Saint Kitts and NevisSaint Kitts and Nevis Flag KN3
Saint LuciaSaint Lucia Flag LC3
Saint Martin (French Part)Saint Martin (French Part) Flag MF6
Saint Pierre and MiquelonSaint Pierre and Miquelon Flag PM1
Saint Vincent and The GrenadinesSaint Vincent and The Grenadines Flag VC4
SamoaSamoa Flag WS7
San MarinoSan Marino Flag SM6
Sao Tome and PrincipeSao Tome and Principe Flag ST2
Saudi ArabiaSaudi Arabia Flag SA35
SenegalSenegal Flag SN6
SerbiaSerbia Flag RS31
SeychellesSeychelles Flag SC14
Sierra LeoneSierra Leone Flag SL10
SingaporeSingapore Flag SG440
Sint Maarten (Dutch Part)Sint Maarten (Dutch Part) Flag SX3
SlovakiaSlovakia Flag SK38
SloveniaSlovenia Flag SI87
Solomon IslandsSolomon Islands Flag SB5
SomaliaSomalia Flag SO14
South AfricaSouth Africa Flag ZA303
South Georgia and The South Sandwich IslandsSouth Georgia and The South Sandwich Islands Flag GS0
South SudanSouth Sudan Flag SS8
SpainSpain Flag ES248
Sri LankaSri Lanka Flag LK15
SudanSudan Flag SD8
SurinameSuriname Flag SR5
Svalbard and Jan MayenSvalbard and Jan Mayen Flag SJ0
SwazilandSwaziland Flag SZ7
SwedenSweden Flag SE222
SwitzerlandSwitzerland Flag CH234
Syrian Arab RepublicSyrian Arab Republic Flag SY3
Taiwan, Province of ChinaTaiwan, Province of China Flag TW172
TajikistanTajikistan Flag TJ4
Tanzania, United Republic ofTanzania, United Republic of Flag TZ68
ThailandThailand Flag TH325
Timor-LesteTimor-Leste Flag TL7
TogoTogo Flag TG5
TokelauTokelau Flag TK2
TongaTonga Flag TO4
Trinidad and TobagoTrinidad and Tobago Flag TT18
TunisiaTunisia Flag TN14
TurkeyTurkey Flag TR99
TurkmenistanTurkmenistan Flag TM0
Turks and Caicos IslandsTurks and Caicos Islands Flag TC4
TuvaluTuvalu Flag TV2
UgandaUganda Flag UG34
UkraineUkraine Flag UA420
United Arab EmiratesUnited Arab Emirates Flag AE32
United KingdomUnited Kingdom Flag GB816
United StatesUnited States Flag US17219
United States Minor Outlying IslandsUnited States Minor Outlying Islands Flag UM0
UruguayUruguay Flag UY28
UzbekistanUzbekistan Flag UZ13
VanuatuVanuatu Flag VU8
Venezuela, Bolivarian Republic ofVenezuela, Bolivarian Republic of Flag VE57
Viet NamViet Nam Flag VN215
Virgin Islands, BritishVirgin Islands, British Flag VG14
Virgin Islands, U.S.Virgin Islands, U.S. Flag VI7
Wallis and FutunaWallis and Futuna Flag WF2
YemenYemen Flag YE4
ZambiaZambia Flag ZM22
ZimbabweZimbabwe Flag ZW16