For example, microsoft.com (note .com at the end) means that microsoft.com is a domain name of a commercial entity.
Top Level DomainsARPA Old style Arpanet COM Commercial EDU Educational GOV Government INT International field MIL US Military NATO Nato field NET Network ORG Non-Profit OrganizationCountry Codes
AD Andorra AE United Arab Emirates AF Afghanistan AG Antigua and Barbuda AI Anguilla AL Albania AM Armenia AN Netherland Antilles AO Angola AQ Antarctica AR Argentina AS American Samoa AT Austria AU Australia AW Aruba AZ Azerbaidjan BA Bosnia-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 Buthan BV Bouvet Island BW Botswana BY Belarus BZ Belize CA Canada CC Cocos (Keeling) Isl. CF Central African Rep. CG Congo CH Switzerland CI Ivory Coast CK Cook Islands CL Chile CM Cameroon CN China CO Colombia CR Costa Rica CS Czechoslovakia 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 ES Spain ET Ethiopia FI Finland FJ Fiji FK Falkland Isl.(Malvinas) FM Micronesia FO Faroe Islands FR France FX France (European Ter.) GA Gabon GB Great Britain (UK) GD Grenada GE Georgia GH Ghana GI Gibraltar GL Greenland GP Guadeloupe (Fr.) GQ Equatorial Guinea GF Guyana (Fr.) GM Gambia GN Guinea GR Greece GT Guatemala GU Guam (US) GW Guinea Bissau GY Guyana HK Hong Kong HM Heard & McDonald Is HN Honduras HR Croatia HT Haiti HU Hungary ID Indonesia IE Ireland IL Israel IN India IO British Indian O. Terr. IQ Iraq IR Iran IS Iceland IT Italy JM Jamaica JO Jordan JP Japan KE Kenya KG Kirgistan KH Cambodia KI Kiribati KM Comoros KN St.Kitts Nevis Anguilla KP Korea (North) KR Korea (South) KW Kuwait KY Cayman Islands KZ Kazachstan LA Laos LB Lebanon LC Saint Lucia LI Liechtenstein LK Sri Lanka LR Liberia LS Lesotho LT Lithuania LU Luxembourg LV Latvia LY Libya MA Morocco MC Monaco MD Moldavia MG Madagascar MH Marshall Islands ML Mali MM Myanmar MN Mongolia MO Macau MP Northern Mariana Isl. MQ Martinique (Fr.) MR Mauritania MS Montserrat MT Malta MU Mauritius MV Maldives MW Malawi MX Mexico MY Malaysia MZ Mozambique NA Namibia NC New Caledonia (Fr.) NE Niger NF Norfolk Island NG Nigeria NI Nicaragua NL Netherlands NO Norway NP Nepal NR Nauru NT Neutral Zone NU Niue NZ New Zealand OM Oman PA Panama PE Peru PF Polynesia (Fr.) PG Papua New Guinea PH Philippines PK Pakistan PL Poland PM St. Pierre & Miquel PN Pitcairn PT Portugal PR Puerto Rico (US) PW Palau PY Paraguay QA Qatar RE Reunion (Fr.) RO Romania RU Russian Federation RW Rwanda SA Saudi Arabia SB Solomon Islands SC Seychelles SD Sudan SE Sweden SG Singapore SH St. Helena SI Slovenia SJ Svalbard & Jan Maye SK Slovak Republic SL Sierra Leone SM San Marino SN Senegal SO Somalia SR Suriname ST St. Tome and Principe SU Soviet Union SV El Salvador SY Syria SZ Swaziland TC Turks & Caicos Isla TD Chad TF French Southern Terr. TG Togo TH Thailand TJ Tadjikistan TK Tokelau TM Turkmenistan TN Tunisia TO Tonga TP East Timor TR Turkey TT Trinidad & Tobago TV Tuvalu TW Taiwan TZ Tanzania UA Ukraine UG Uganda UK United Kingdom UM US Minor outlying Isl. US United States UY Uruguay UZ Uzbekistan VA Vatican City State VC St.Vincent & Grenad VE Venezuela VG Virgin Islands (British VI Virgin Islands (US) VN Vietnam VU Vanuatu WF Wallis & Futuna Isl WS Samoa YE Yemen YU Yugoslavia ZA South Africa ZM Zambia ZR Zaire ZW Zimbabwe