Список имен доменов первого уровня.

Домены первого уровня 

===============================================
com - commercial (коммерческие)
edu - educational (образовательные)
gov - goverment (правительственные)
mil - military (военные учреждения США)
net - network (организации, обеспечивающие работу сети)
org - organization (некоммерческие организации)
info - information services (информационные узлы)
biz - businesses, firms (коммерческие организации)
arpa - ArpaNet 
===============================================


Список доменов первого уровня по странам.

===============================================
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,Bielorussia                             
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                              
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                                 
GF,Guyana (Fr.)                            
GH,Ghana                                   
GI,Gibraltar                               
GL,Greenland                               
GM,Gambia                                  
GN,Guinea                                  
GP,Guadeloupe (Fr.)                        
GQ,Equatorial Guinea                       
GR,Greece                                  
GT,Guatemala                               
GU,Guam (US)                               
GW,Guinea Bissau                           
GY,Guyana                                  
HK,Hong Kong                               
HM,Heard & McDonald Isl.                   
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
MK,Macedonia
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 & Miquelon
PN,Pitcairn
PR,Puerto Rico (US)
PT,Portugal
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 Mayen Is
SK,Slovakia
SL,Sierra Leone
SM,San Marino
SN,Senegal
SO,Somalia
SR,Suriname
ST,St. Tome and Principe
SU,Soviet Union      still used
SV,El Salvador
SY,Syria
SZ,Swaziland
TC,Turks & Caicos Islands
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 & Grenadines
VE,Venezuela
VG,Virgin Islands (British)
VI,Virgin Islands (US)
VN,Vietnam
VU,Vanuatu
WF,Wallis & Futuna Islands
WS,Samoa
YE,Yemen
YU,Yugoslavia
ZA,South Africa
ZM,Zambia
ZR,Zaire
ZW,Zimbabwe
===============================================

Заметьте, что домен SU поддерживается "искуственно" 
и официально его как бы и нет.