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Composition of domain names and
special exception rules for .tw domains.

Not every domain name can actually be registered, since some names are not allowed for registration as a matter of principle. A designated domain name has to meet the following conditions.
  • Domain names may only consist of the letters from »a« to »z«, the digits »0« to »9«, and the hyphen.
  • Domain names may not be longer than 63 characters.
  • Domain names may neither start nor end with a hyphen.
  • Domain names may not include a hyphen as the third or fourth character. For example the registration of »xn--hzurenfd.com.tw« is not possible.
  • The domain name must not consist of one of the 2-character country codes.

List of exceptions

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