ISO 3166 defines two-letter and three-letter codes for every country. Two-letter codes are appended to most eddresses and server names, except in the United States where such names usually end either without that information or with a two-letter state code and a .us. Esperanto names were drawn from § 4.1.8.2 of David K. Jordan's Being Colloquial in Esperanto, tables found on pages 27 through 30 of Litova Stelo #133 (majo-junio 2000), Listo C. Regnokodoj laŭ ISO 3166 in La Nova Plena Ilustrita Vortaro de Esperanto, Peter Benson's Comprehensive English-Esperanto Dictionary, and La Jaro (praktika enciklopedieto de Monato (2002)). Since some of these sources are monolingually Esperanto, and the codes in La Jaro don't always match ISO 3166, I was sometimes unsure of the English name when, for example, several countries had similar names, or the English only seemed obvious. So in several cases I matched currency codes and capital cities from NPIV and La Jaro entries with entries from ISO 4217, a 1990 World Almanac and Book of Facts, The New York Public Library Desk Reference, and the Encarta World English Dictionary.
| .edu | Educational organisations |
| .com | Commercial companies |
| .mil | Military establishments |
| .gov | Government offices |
| .org | Non-governmental organisations |
| .net | Internet Service Providers |
| ad | and | Andoro | Andorra |
| ae | are | Unuiĝintaj Arabaj Emirlandoj | United Arab Emirates |
| af | afg | Afganio | Afghanistan |
| ag | atg | Antigvo-Barbudo | Antigua and Barbuda |
| ai | aia | Angilo | Anguilla |
| al | alb | Albanio | Albania |
| am | arm | Armenio | Armenia |
| an | ant | Netherlands Antilles | |
| ao | ago | Angolo | Angola |
| aq | ata | Antarktio | Antarctica |
| ar | arg | Argentino | Argentina |
| as | asm | American Samoa | |
| at | aut | Aŭstrio | Austria |
| au | aus | Aŭstralio | Australia |
| aw | abw | Aruba | |
| az | aze | Azerbajĝano | Azerbaijan |
| ba | bih | Bosnio-Hercegovino | Bosnia and Herzegovina |
| bb | brb | Barbado | Barbados |
| bd | bgd | Bangladeŝo | Bangladesh |
| be | bel | Belgio | Belgium |
| bf | bfa | Burkino | Burkina Faso |
| bg | bgr | Bulgario | Bulgaria |
| bh | bhr | Barejno | Bahrain |
| bi | bdi | Burundio | Burundi |
| bj | ben | Benino | Benin |
| bm | bmu | Bermudo | Bermuda |
| bn | brn | Brunejo | Brunei Darussalam |
| bo | bol | Bolivio | Bolivia |
| br | bra | Brazilo | Brazil |
| bs | bhs | Bahamo | Bahamas |
| bt | btn | Butano | Bhutan |
| bv | bvt | Bouvet Island | |
| bw | bwa | Bocvano | Botswana |
| by | blr | Bjelorusio | Belarus |
| bz | blz | Belizo | Belize |
| ca | can | Kanado | Canada |
| cc | cck | Cocos (Keeling) Islands | |
| cd | Kongo Orienta, Konga Demokrata Respubliko | Congo (formerly Zaire) | |
| cf | caf | Centrafika Respubliko | Central African Republic |
| cg | cog | Kongo Okcidenta, Konga Popola Respubliko | Congo |
| ch | che | Svislando | Switzerland |
| ci | civ | Ebura Bordo | Cote D'Ivoire |
| ck | cok | Kuk-Insularo | Cook Islands |
| cl | chl | Ĉilio | Chile |
| cm | cmr | Kamerunio | Cameroon |
| cn | chn | Ĉinio | China |
| co | col | Kolombio | Colombia |
| cr | cri | Kostariko | Costa Rica |
| cu | cub | Kubo | Cuba |
| cv | cpv | Kabo-Verdo | Cape Verde |
| cx | cxr | Christmas Island | |
| cy | cyp | Kipro | Cyprus |
| cz | cze | Ĉeĥio | Czech Republic |
| de | deu | Germanio | Germany |
| dj | dji | Ĝibutio | Djibouti |
| dk | dnk | Danio | Denmark |
| dm | dma | Dominiko | Dominica |
| do | dom | Domingo | Dominican Republic |
| dz | dza | Alĝerio | Algeria |
| ec | ecu | Ekvadoro | Ecuador |
| ee | est | Estonio | Estonia |
| eg | egy | Egiptio | Egypt |
| eh | esh | Western Sahara | |
| er | eri | Eritreo | Eritrea |
| es | esp | Hispanio | Spain |
| et | eth | Etiopio | Ethiopia |
| fi | fin | Finnlando | Finland |
| fj | fji | Fiĝio | Fiji |
| fk | flk | Falkland Islands (Malvinas) | |
| fm | fsm | Mikronezio | Federated States Of Micronesia |
| fo | fro | Insuloj Feroaj | Faroe Islands |
| fr | fra | Francio | France |
| fx | fxx | France, Metropolitan | |
| ga | gab | Gabono | Gabon |
| gb | gbr | Britio | United Kingdom |
| gd | grd | Grenado | Grenada |
| ge | geo | Kartvelio | Georgia |
| gf | guf | French Guiana | |
| gh | gha | Ganao | Ghana |
| gi | gib | Ĝibraltaro | Gibraltar |
| gl | grl | Grenlando | Greenland |
| gm | gmb | Gambio | Gambia |
| gn | gin | Gvineo | Guinea |
| gp | glp | Gvadelupo | Guadeloupe |
| gq | gnq | Gvineo Ekvatoro | Equatorial Guinea |
| gr | grc | Grekio, Greklando | Greece |
| gs | sgs | South Georgia and South Sandwich Islands | |
| gt | gtm | Gvatemalo | Guatemala |
| gu | gum | Gvamo | Guam |
| gw | gnb | Gvineo-Bisaŭo | Guinea-Bissau |
| gy | guy | Gvajano | Guyana |
| hk | hkg | Honkongo | Hong Kong |
| hm | hmd | Heard and McDonald Islands | |
| hn | hnd | Honduro | Honduras |
| hr | hrv | Kroatio | Croatia (Hrvatska) |
| ht | hti | Haitio | Haiti |
| hu | hun | Hungario | Hungary |
| id | idn | Indonezio | Indonesia |
| ie | irl | Irlando | Ireland |
| il | isr | Israelo | Israel |
| in | ind | Hindujo, Hindio, Hinda Unio, Barato | India |
| io | iot | British Indian Ocean Territory | |
| iq | irq | Irako | Iraq |
| ir | irn | Irano | Islamic Republic Of Iran |
| is | isl | Islando | Iceland |
| it | ita | Italio | Italy |
| jm | jam | Jamaiko | Jamaica |
| jo | jor | Jordanio | Jordan |
| jp | jpn | Japanio | Japan |
| ke | ken | Kenjo | Kenya |
| kg | kgz | Kirgizio | Kyrgyzstan |
| kh | khm | Kamboĝo | Cambodia |
| ki | kir | Kiribato | Kiribati |
| km | com | Komoro | Comoros |
| kn | kna | Sent-Kristofo kaj Neviso | Saint Kitts and Nevis |
| kp | prk | Korea Norda, Korea Demokrata Respubliko | Democratic People's Republic Of Korea |
| kr | kor | Korea Suda, Respubliko Koreio | Republic Of Korea |
| kw | kwt | Kuvajto | Kuwait |
| ky | cym | Cayman Islands | |
| kz | kaz | Kazaĥio | Kazakhstan |
| la | lao | Laoso | Lao People's Democratic Republic |
| lb | lbn | Libano | Lebanon |
| lc | lca | Sent-Lucio | Saint Lucia |
| li | lie | Liĥtenŝtenjo | Liechtenstein |
| lk | lka | Srilanko | Sri Lanka |
| lr | lbr | Liberio | Liberia |
| ls | lso | Lesoto | Lesotho |
| lt | ltu | Litovio | Lithuania |
| lu | lux | Luksemburgio | Luxembourg |
| lv | lva | Latvio | Latvia |
| ly | lby | Libio | Libyan Arab Jamahiriya |
| ma | mar | Maroko | Morocco |
| mc | mco | Monako | Monaco |
| md | mda | Moldavio | Republic Of Moldova |
| mg | mdg | Madagaskaro | Madagascar |
| mh | mhl | Marŝalaj Insuloj | Marshall Islands |
| mk | mkd | Makedonio | Macedonia |
| ml | mli | Malio | Mali |
| mm | mmr | Mjanmaro, Birmo | Myanmar, Burma |
| mn | mng | Mongolio | Mongolia |
| mo | mac | Macau | |
| mp | mnp | Northern Mariana Islands | |
| mq | mtq | Martiniko | Martinique |
| mr | mrt | Maŭritanio | Mauritania |
| ms | msr | Montserato | Montserrat |
| mt | mlt | Malto | Malta |
| mu | mus | Maŭricio | Mauritius |
| mv | mdv | Maldivo | Maldives |
| mw | mwi | Malavio | Malawi |
| mx | mex | Meksiko | Mexico |
| my | mys | Malajzio | Malaysia |
| mz | moz | Mozambiko | Mozambique |
| na | nam | Namibio | Namibia |
| nc | ncl | Nov-Kaledonio | New Caledonia |
| ne | ner | Niĝero, Niĝerlando | Niger |
| nf | nfk | Norfolk Island | |
| ng | nga | Niĝerio | Nigeria |
| ni | nic | Nikaragvo | Nicaragua |
| nl | nld | Nederlando | Netherlands |
| no | nor | Norvegio | Norway |
| np | npl | Nepalo | Nepal |
| nr | nru | Naŭro | Nauru |
| nu | niu | Niue | |
| nz | nzl | Nov-Zelando | New Zealand |
| om | omn | Omano | Oman |
| pa | pan | Panamo | Panama |
| pe | per | Peruo | Peru |
| pf | pyf | Tahitio | French Polynesia |
| pg | png | Papua Nov-Gvineo | Papua New Guinea |
| ph | phl | Filipinoj | Philippines |
| pk | pak | Pakistano | Pakistan |
| pl | pol | Pollando | Poland |
| pm | spm | St. Pierre and Miquelon | |
| pn | pcn | Pitcairn | |
| pr | pri | Portoriko | Puerto Rico |
| pt | prt | Portugalio | Portugal |
| pw | plw | Palaŭo | Palau |
| py | pry | Paragvajo | Paraguay |
| qa | qat | Kataro | Qatar |
| re | reu | Reunio | Reunion |
| ro | rom | Rumanio | Romania |
| ru | rus | Ruslando | Russian Federation |
| rw | rwa | Ruando | Rwanda |
| sa | sau | Saŭda Arabio | Saudi Arabia |
| sb | slb | Salomono-Insuloj | Solomon Islands |
| sc | syc | Sejŝelo | Seychelles |
| sd | sdn | Sudano | Sudan |
| se | swe | Svedio | Sweden |
| sg | sgp | Singapuro | Singapore |
| sh | shn | St. Helena | |
| si | svn | Slovenio | Slovenia |
| sj | sjm | Svalbard and Jan Mayen Islands | |
| sk | svk | Slovakio | Slovakia (Slovak Republic) |
| sl | sle | Siera-Leono | Sierra Leone |
| sm | smr | Sanmarino | San Marino |
| sn | sen | Senegalio | Senegal |
| so | som | Somalio | Somalia |
| sr | sur | Surinamo | Suriname |
| st | stp | Sao-Tomeo kaj Principeo | Sao Tome and Principe |
| sv | slv | Salvadoro | El Salvador |
| sy | syr | Sirio | Syrian Arab Republic |
| sz | swz | Svazilando | Swaziland |
| tc | tca | Turks and Caicos Islands | |
| td | tcd | Ĉado, Ĉadio, Ĉadlando | Chad |
| tf | atf | French Southern Territories | |
| tg | tgo | Togolando | Togo |
| th | tha | Tajlando | Thailand |
| tj | tjk | Taĝikio | Tajikistan |
| tk | tkl | Tokelau | |
| tm | tkm | Turkmenio | Turkmenistan |
| tn | tun | Tunizio | Tunisia |
| to | ton | Tongo | Tonga |
| tp | tmp | Timoro Orienta | East Timor |
| tr | tur | Turkio | Turkey |
| tt | tto | Trinidado kaj Tobago | Trinidad and Tobago |
| tv | tuv | Tuvaluo | Tuvalu |
| tw | twn | Tajvano | Taiwan |
| tz | tza | Tanzanio | United Republic Of Tanzania |
| ua | ukr | Ukrainio | Ukraine |
| ug | uga | Ugando | Uganda |
| um | umi | United States Minor Outlying Islands | |
| us | usa | Usono | United States |
| uy | ury | Urugvajo | Uruguay |
| uz | uzb | Uzbekio | Uzbekistan |
| va | vat | Vatikano | Vatican City State |
| vc | vct | Sent-Vincento kaj Grenadinoj | Saint Vincent and the Grenadines |
| ve | ven | Venezuelo | Venezuela |
| vg | vgb | Insuloj Virgaj (Britaj) | Virgin Islands (British) |
| vi | vir | Insuloj Virgaj (Usonaj) | Virgin Islands (U.S.) |
| vn | vnm | Vjetnamio | Viet Nam |
| vu | vut | Vanuatuo | Vanuatu |
| wf | wlf | Wallis and Futuna Islands | |
| ws | wsm | Samoo Okcidenta | Samoa |
| ye | yem | Jemeno | Yemen |
| yt | myt | Mayotte | |
| yu | yug | Jugoslavio | Yugoslavia |
| za | zaf | Sud-Afriko | South Africa (Zuid Afrika) |
| zm | zmb | Zambio | Zambia |
| zr | zar | Zairo | Zaire |
| zw | zwe | Zimbabvo | Zimbabwe |