IDN's are domain names in non-ASCII format. IDN's are supported by the following top-level domain.
[source: Mozilla.org IDN-enabled TLD's ]

>>> submit your IDN order

.biz	Registry	Policy	Supported by EnCirca
.cat	Registry	Policy	Supported by EnCirca
.com	Registry	Policy	Supported by EnCirca
.info	Registry	Policy	Supported by EnCirca
.museum	Registry	Policy	Not Supported by EnCirca
.net	Registry	Policy	Supported by EnCirca
.org	Registry	Policy	Supported by EnCirca

.ac	Registry	Policy	Supported by EnCirca
.ae	Registry	Policy	Not supported by EnCirca
.ar	Registry	Policy	Not Supported by EnCirca
.at	Registry	Policy (character list)	Supported by EnCirca
.br	Registry	Policy	Not Supported by EnCirca
.ch	Registry	Policy	Not Supported by EnCirca
.cl	Registry	Policy	Not Supported by EnCirca
.cn	Registry	Policy (JET Guidelines)	Supported by EnCirca
.de	Registry	Policy	Supported by EnCirca
.dk	Registry	Policy	Not Supported by EnCirca
.eg	Registry	Policy	Not supported by EnCirca
.es	Registry	Policy (character list)	Not Supported by EnCirca
.eu	Registry	Policy (character list)	Supported by EnCirca
.fi	Registry	Policy	Not Supported by EnCirca
.gr	Registry	Policy	Not Supported by EnCirca
.hu	Registry	Policy (section 2.1.2)	Not Supported by EnCirca
.io	Registry	Policy	Supported by EnCirca
.ir	Registry	Policy	Not Supported by EnCirca
.is	Registry	Policy	Not Supported by EnCirca
.jp	Registry	Policy	Supported by EnCirca
.kr	Registry	Policy (JET Guidelines)	Not Supported by EnCirca
.li	Registry	Policy (managed by .ch registry)	Not Supported by EnCirca
.lt	Registry	Policy	Not Supported by EnCirca
.no	Registry	Policy (section 4)	Not Supported by EnCirca
.pr	Registry	Policy	Not Supported by EnCirca
.pl	Registry	Policy	Supported by EnCirca
.ru	Registry	Policy	Not supported by EnCirca
.sa	Registry	Policy	Not supported by EnCirca
.se	Registry	Policy (character list)	Not Supported by EnCirca
.sh	Registry	Policy	Supported by EnCirca
.th	Registry	Policy	Not Supported by EnCirca
.tm	Registry	Policy	Supported by EnCirca
.tw	Registry	Policy (JET Guidelines)	Supported by EnCirca
.vn	Registry	Policy (character list)	Not Supported by EnCirca

>>> submit your IDN order