Aqui temos uma lista com todos os "TLD code" ou extensões de domínio normalmente destinadas a cada país do mundo. Para o Brasil existe a extensão raiz .BR. Para a Argentina existe o .AR e assim por diante. Veja a lista completa.

.ac - Ascension Island
.ad - Andorra
.ae - United Arab Emirates
.af - Afghanistan
.ag - Antigua and Barbuda
.ai - Anguilla
.al - Albania
.am - Armenia
.an - Netherlands Antilles
.ao - Angola
.aq - Antarctica
.ar - Argentina
.as - American Samoa
.at - Austria
.au - Australia
.aw - Aruba
.ax - Aland Islands
.az - Azerbaijan
.ba - Bosnia and Herzegovina
.bb - Barbados
.bd - Bangladesh
.be - Belgium
.bf - Burkina Faso
.bg - Bulgaria
.bh - Bahrain
.bi - Burundi
.bj - Benin
.bm - Bermuda
.bn - Brunei Darussalam
.bo - Bolivia
.br - Brazil
.bs - Bahamas
.bt - Bhutan
.bv - Bouvet Island
.bw - Botswana
.by - Belarus
.bz - Belize
.ca - Canada
.cc - Cocos (Keeling) Islands
.cd - Congo, The Democratic Republic of the
.cf - Central African Republic
.cg - Congo, Republic of
.ch - Switzerland
.ci - Cote d'Ivoire
.ck - Cook Islands
.cl - Chile
.cm - Cameroon
.cn - China
.co - Colombia
.cr - Costa Rica
.cu - Cuba
.cv - Cape Verde
.cx - Christmas Island
.cy - Cyprus
.cz - Czech Republic
.de - Germany
.dj - Djibouti
.dk - Denmark
.dm - Dominica
.do - Dominican Republic
.dz - Algeria
.ec - Ecuador
.ee - Estonia
.eg - Egypt
.eh - Western Sahara
.er - Eritrea
.es - Spain
.et - Ethiopia
.eu - European Union
.fi - Finland
.fj - Fiji
.fk - Falkland Islands (Malvinas)
.fm - Micronesia, Federated States of
.fo - Faroe Islands
.fr - France
.ga - Gabon
.gb - United Kingdom
.gd - Grenada
.ge - Georgia
.gf - French Guiana
.gg - Guernsey
.gh - Ghana
.gi - Gibraltar
.gl - Greenland
.gm - Gambia
.gn - Guinea
.gp - Guadeloupe
.gq - Equatorial Guinea
.gr - Greece
.gs - South Georgia and the South Sandwich Islands
.gt - Guatemala
.gu - Guam
.gw - Guinea-Bissau
.gy - Guyana
.hk - Hong Kong
.hm - Heard and McDonald Islands
.hn - Honduras
.hr - Croatia/Hrvatska
.ht - Haiti
.hu - Hungary
.id - Indonesia
.ie - Ireland
.il - Israel
.im - Isle of Man
.in - India
.io - British Indian Ocean Territory
.iq - Iraq
.ir - Iran, Islamic Republic of
.is - Iceland
.it - Italy
.je - Jersey
.jm - Jamaica
.jo - Jordan
.jp - Japan
.ke - Kenya
.kg - Kyrgyzstan
.kh - Cambodia
.ki - Kiribati
.km - Comoros
.kn - Saint Kitts and Nevis
.kp - Korea, Democratic People's Republic
.kr - Korea, Republic of
.kw - Kuwait
.ky - Cayman Islands
.kz - Kazakhstan
.la - Lao People's Democratic Republic
.lb - Lebanon
.lc - Saint Lucia
.li - Liechtenstein
.lk - Sri Lanka
.lr - Liberia
.ls - Lesotho
.lt - Lithuania
.lu - Luxembourg
.lv - Latvia
.ly - Libyan Arab Jamahiriya
.ma - Morocco
.mc - Monaco
.md - Moldova, Republic of
.me - Montenegro
.mg - Madagascar
.mh - Marshall Islands
.mk - Macedonia, The Former Yugoslav Republic of
.ml - Mali
.mm - Myanmar
.mn - Mongolia
.mo - Macao
.mp - Northern Mariana Islands
.mq - Martinique
.mr - Mauritania
.ms - Montserrat
.mt - Malta
.mu - Mauritius
.mv - Maldives
.mw - Malawi
.mx - Mexico
.my - Malaysia
.mz - Mozambique
.na - Namibia
.nc - New Caledonia
.ne - Niger
.nf - Norfolk Island
.ng - Nigeria
.ni - Nicaragua
.nl - Netherlands
.no - Norway
.np - Nepal
.nr - Nauru
.nu - Niue
.nz - New Zealand
.om - Oman
.pa - Panama
.pe - Peru
.pf - French Polynesia
.pg - Papua New Guinea
.ph - Philippines
.pk - Pakistan
.pl - Poland
.pm - Saint Pierre and Miquelon
.pn - Pitcairn Island
.pr - Puerto Rico
.ps - Palestinian Territory, Occupied
.pt - Portugal
.pw - Palau
.py - Paraguay
.qa - Qatar
.re - Reunion Island
.ro - Romania
.rs - Serbia
.ru - Russian Federation
.rw - Rwanda
.sa - Saudi Arabia
.sb - Solomon Islands
.sc - Seychelles
.sd - Sudan
.se - Sweden
.sg - Singapore
.sh - Saint Helena
.si - Slovenia
.sj - Svalbard and Jan Mayen Islands
.sk - Slovak Republic
.sl - Sierra Leone
.sm - San Marino
.sn - Senegal
.so - Somalia
.sr - Suriname
.st - Sao Tome and Principe
.su - Soviet Union (being phased out)
.sv - El Salvador
.sy - Syrian Arab Republic
.sz - Swaziland
.tc - Turks and Caicos Islands
.td - Chad
.tf - French Southern Territories
.tg - Togo
.th - Thailand
.tj - Tajikistan
.tk - Tokelau
.tl - Timor-Leste
.tm - Turkmenistan
.tn - Tunisia
.to - Tonga
.tp - East Timor
.tr - Turkey
.tt - Trinidad and Tobago
.tv - Tuvalu
.tw - Taiwan
.tz - Tanzania
.ua - Ukraine
.ug - Uganda
.uk - United Kingdom
.um - United States Minor Outlying Islands
.us - United States
.uy - Uruguay
.uz - Uzbekistan
.va - Holy See (Vatican City State)
.vc - Saint Vincent and the Grenadines
.ve - Venezuela
.vg - Virgin Islands, British
.vi - Virgin Islands, U.S.
.vn - Vietnam
.vu - Vanuatu
.wf - Wallis and Futuna Islands
.ws - Samoa
.ye - Yemen
.yt - Mayotte
.yu - Yugoslavia
.za - South Africa
.zm - Zambia
.zw - Zimbabwe