Aquí puedes echar una ojeada a los distintos códigos de países usados por los dominios de cada país (uno navega por ahí y no sabe de qué país es una página ).

Codigos de Paises (ordenados por Dominio) :
-------------------------------------------

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) Islands
CF   Central African Republic
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 Islands (Islas Malvinas)
FM   Micronesia
FO   Faroe Islands
FR   France
FX   France (European Territory)
GA   Gabon
GB   Great Britain (UK)
GD   Grenada
GE   Georgia
GH   Ghana
GI   Gibraltar
GL   Greenland
GP   Guadeloupe (French)
GQ   Equatorial Guinea
GF   Guyana (French)
GM   Gambia
GN   Guinea
GR   Greece
GT   Guatemala
GU   Guam (US)
GW   Guinea Bissau
GY   Guyana
HK   Hong Kong
HM   Heard and McDonald Islands
HN   Honduras
HR   Croatia
HT   Haiti
HU   Hungary
ID   Indonesia
IE   Ireland
IL   Israel
IN   India
IO   British Indian Ocean Territory
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   Saint Kitts-Nevis
KP   North Korea
KR   South Korea
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 Islands
MQ   Martinique (French)
MR   Mauritania
MS   Montserrat
MT   Malta
MU   Mauritius
MV   Maldives
MW   Malawi
MX   Mexico
MY   Malaysia
MZ   Mozambique
NA   Namibia
NC   New Caledonia (French)
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 (French)
PG   Papua New
PH   Philippines
PK   Pakistan
PL   Poland
PM   Saint Pierre and Miquelon
PN   Pitcairn
PT   Portugal
PR   Puerto Rico (US)
PW   Palau
PY   Paraguay
QA   Qatar
RE   Reunion (French)
RO   Romania
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   Saint Tome and Principe
SU   Soviet Union
SV   El Salvador
SY   Syria
SZ   Swaziland
TC   Turks and Caicos Islands
TD   Chad
TF   French Southern Territory
TG   Togo
TH   Thailand
TJ   Tadjikistan
TK   Tokelau
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   US Minor Outlying Islands
US   United States
UY   Uruguay
UZ   Uzbekistan
VA   Vatican City State
VC   Saint Vincent and Grenadines
VE   Venezuela
VG   Virgin Islands (British)
VI   Virgin Islands (US)
VN   Vietnam
VU   Vanuatu
WF   Wallis and Futuna Islands
WS   Samoa
YE   Yemen
YU   Yugoslavia
ZA   South Africa
ZM   Zambia
ZR   Zaire
ZW   Zimbabwe
-----------------------
ARPA  Vieja red ARPANET
COM   Comercial
EDU   Propósitos educativos de EEUU
GOV   Gobiernos de EEUU
INT   Internacional
MIL   Propósitos militares de EEUU
NATO  Campo NATO
NET   Redes
ORG   Organizaciones sin ánimo de lucro
-----------------------



Codigos de Paises (ordenados por Pais) :
----------------------------------------
                                         
AFGHANISTAN                                     AF     
ALBANIA                                         AL      
ALGERIA                                         DZ      
AMERICAN SAMOA                                  AS      
ANDORRA                                         AD      
ANGOLA                                          AO      
ANGUILLA                                        AI      
ANTARCTICA                                      AQ      
ANTIGUA AND BARBUDA                             AG      
ARGENTINA                                       AR      
ARMENIA                                         AM             
ARUBA                                           AW           
AUSTRALIA                                       AU           
AUSTRIA                                         AT           
AZERBAIJAN                                      AZ             
BAHAMAS                                         BS           
BAHRAIN                                         BH           
BANGLADESH                                      BD           
BARBADOS                                        BB           
BELARUS                                         BY             
BELGIUM                                         BE           
BELIZE                                          BZ           
BENIN                                           BJ           
BERMUDA                                         BM           
BHUTAN                                          BT           
BOLIVIA                                         BO           
BOSNIA AND HERZEGOWINA                          BA           
BOTSWANA                                        BW           
BOUVET ISLAND                                   BV           
BRAZIL                                          BR           
BRITISH INDIAN OCEAN TERRITORY                  IO           
BRUNEI DARUSSALAM                               BN           
BULGARIA                                        BG           
BURKINA FASO                                    BF           
BURUNDI                                         BI           
CAMBODIA                                        KH           
CAMEROON                                        CM           
CANADA                                          CA           
CAPE VERDE                                      CV           
CAYMAN ISLANDS                                  KY           
CENTRAL AFRICAN REPUBLIC                        CF           
CHAD                                            TD           
CHILE                                           CL           
CHINA                                           CN           
CHRISTMAS ISLAND                                CX           
COCOS (KEELING) ISLANDS                         CC           
COLOMBIA                                        CO           
COMOROS                                         KM           
CONGO                                           CG           
COOK ISLANDS                                    CK           
COSTA RICA                                      CR           
COTE D'IVOIRE                                   CI           
CROATIA (local name: Hrvatska)                  HR                 
CUBA                                            CU           
CYPRUS                                          CY           
CZECH REPUBLIC                                  CZ             
DENMARK                                         DK           
DJIBOUTI                                        DJ           
DOMINICA                                        DM           
DOMINICAN REPUBLIC                              DO           
EAST TIMOR                                      TP           
ECUADOR                                         EC           
EGYPT                                           EG           
EL SALVADOR                                     SV           
EQUATORIAL GUINEA                               GQ           
ERITREA                                         ER            
ESTONIA                                         EE             
ETHIOPIA                                        ET           
FALKLAND ISLANDS (MALVINAS)                     FK           
FAROE ISLANDS                                   FO           
FIJI                                            FJ           
FINLAND                                         FI           
FRANCE                                          FR           
FRANCE, METROPOLITAN                            FX             
FRENCH GUIANA                                   GF           
FRENCH POLYNESIA                                PF           
FRENCH SOUTHERN TERRITORIES                     TF           
GABON                                           GA           
GAMBIA                                          GM          
GEORGIA                                         GE            
GERMANY                                         DE         
GHANA                                           GH          
GIBRALTAR                                       GI           
GREECE                                          GR           
GREENLAND                                       GL           
GRENADA                                         GD           
GUADELOUPE                                      GP           
GUAM                                            GU           
GUATEMALA                                       GT           
GUINEA                                          GN           
GUINEA-BISSAU                                   GW           
GUYANA                                          GY           
HAITI                                           HT           
HEARD AND MC DONALD ISLANDS                     HM           
HONDURAS                                        HN           
HONG KONG                                       HK           
HUNGARY                                         HU           
ICELAND                                         IS           
INDIA                                           IN           
INDONESIA                                       ID           
IRAN (ISLAMIC REPUBLIC OF)                      IR           
IRAQ                                            IQ          
IRELAND                                         IE           
ISRAEL                                          IL           
ITALY                                           IT           
JAMAICA                                         JM           
JAPAN                                           JP           
JORDAN                                          JO           
KAZAKHSTAN                                      KZ             
KENYA                                           KE           
KIRIBATI                                        KI           
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF          KP           
KOREA, REPUBLIC OF                              KR           
KUWAIT                                          KW           
KYRGYZSTAN                                      KG             
LAO PEOPLE'S DEMOCRATIC REPUBLIC                LA           
LATVIA                                          LV             
LEBANON                                         LB           
LESOTHO                                         LS           
LIBERIA                                         LR           
LIBYAN ARAB JAMAHIRIYA                          LY           
LIECHTENSTEIN                                   LI           
LITHUANIA                                       LT             
LUXEMBOURG                                      LU           
MACAU                                           MO          
MACEDONIA, THE FORMER YUGOSLAV REPUBLIC OF      MK            
MADAGASCAR                                      MG          
MALAWI                                          MW          
MALAYSIA                                        MY          
MALDIVES                                        MV           
MALI                                            ML           
MALTA                                           MT          
MARSHALL ISLANDS                                MH           
MARTINIQUE                                      MQ           
MAURITANIA                                      MR           
MAURITIUS                                       MU           
MAYOTTE                                         YT             
MEXICO                                          MX           
MICRONESIA, FEDERATED STATES OF                 FM           
MOLDOVA, REPUBLIC OF                            MD             
MONACO                                          MC           
MONGOLIA                                        MN           
MONTSERRAT                                      MS           
MOROCCO                                         MA           
MOZAMBIQUE                                      MZ           
MYANMAR                                         MM           
NAMIBIA                                         NA           
NAURU                                           NR           
NEPAL                                           NP           
NETHERLANDS                                     NL           
NETHERLANDS ANTILLES                            AN           
NEW CALEDONIA                                   NC           
NEW ZEALAND                                     NZ           
NICARAGUA                                       NI           
NIGER                                           NE           
NIGERIA                                         NG           
NIUE                                            NU           
NORFOLK ISLAND                                  NF           
NORTHERN MARIANA ISLANDS                        MP           
NORWAY                                          NO           
OMAN                                            OM           
PAKISTAN                                        PK           
PALAU                                           PW           
PANAMA                                          PA           
PAPUA NEW GUINEA                                PG           
PARAGUAY                                        PY           
PERU                                            PE           
PHILIPPINES                                     PH           
PITCAIRN                                        PN           
POLAND                                          PL           
PORTUGAL                                        PT           
PUERTO RICO                                     PR           
QATAR                                           QA           
REUNION                                         RE           
ROMANIA                                         RO           
RUSSIAN FEDERATION                              RU           
RWANDA                                          RW           
SAINT KITTS AND NEVIS                           KN           
SAINT LUCIA                                     LC           
SAINT VINCENT AND THE GRENADINES                VC           
SAMOA                                           WS           
SAN MARINO                                      SM           
SAO TOME AND PRINCIPE                           ST           
SAUDI ARABIA                                    SA           
SENEGAL                                         SN           
SEYCHELLES                                      SC           
SIERRA LEONE                                    SL           
SINGAPORE                                       SG           
SLOVAKIA (Slovak Republic)                      SK             
SLOVENIA                                        SI             
SOLOMON ISLANDS                                 SB           
SOMALIA                                         SO           
SOUTH AFRICA                                    ZA           
SOUTH GEORGIA AND THE SOUTH SANDWICH ISLANDS    GS           
SPAIN                                           ES           
SRI LANKA                                       LK           
ST. HELENA                                      SH           
ST. PIERRE AND MIQUELON                         PM           
SUDAN                                           SD           
SURINAME                                        SR           
SVALBARD AND JAN MAYEN ISLANDS                  SJ           
SWAZILAND                                       SZ           
SWEDEN                                          SE           
SWITZERLAND                                     CH           
SYRIAN ARAB REPUBLIC                            SY           
TAIWAN, PROVINCE OF CHINA                       TW           
TAJIKISTAN                                      TJ             
TANZANIA, UNITED REPUBLIC OF                    TZ           
THAILAND                                        TH           
TOGO                                            TG           
TOKELAU                                         TK           
TONGA                                           TO           
TRINIDAD AND TOBAGO                             TT           
TUNISIA                                         TN           
TURKEY                                          TR           
TURKMENISTAN                                    TM             
TURKS AND CAICOS ISLANDS                        TC           
TUVALU                                          TV           
UGANDA                                          UG           
UKRAINE                                         UA           
UNITED ARAB EMIRATES                            AE           
UNITED KINGDOM                                  GB           
UNITED STATES                                   US           
UNITED STATES MINOR OUTLYING ISLANDS            UM           
URUGUAY                                         UY           
UZBEKISTAN                                      UZ             
VANUATU                                         VU           
VATICAN CITY STATE (HOLY SEE)                   VA           
VENEZUELA                                       VE           
VIET NAM                                        VN           
VIRGIN ISLANDS (BRITISH)                        VG           
VIRGIN ISLANDS (U.S.)                           VI           
WALLIS AND FUTUNA ISLANDS                       WF           
WESTERN SAHARA                                  EH           
YEMEN                                           YE           
YUGOSLAVIA                                      YU           
ZAIRE                                           ZR           
ZAMBIA                                          ZM           
ZIMBABWE                                        ZW
--------------------------------------------------
Internacional                                  INT
Campo NATO                                    NATO
Redes                                          NET
Organizaciones sin ánimo de lucro              ORG
Vieja red ARPANET                             ARPA
Comercial                                      COM
Propósitos educativos de EEUU                  EDU
Gobiernos de EEUU                              GOV
Propósitos militares de EEUU                   MIL
--------------------------------------------------