ThaiURL

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ThaiURL (Thai Uniform Resource Locator) is a technology enabling the use of Thai domain names in applications that have been modified to support this technology.

It is one of several such systems that were marketed before the advent of IDNA.

Traditionally, the Domain Name System (DNS), does not allow domain names with Thai characters. The only characters allowed in DNS names, as specified in RFC 1034 “Domain names - concepts and facilities” and RFC 1035 “Domain names - implementation and specification”, are

Letter: “a” through “z” (case insensitive)
Digit: “0” through “9”
Hyphen (-)

The ThaiURL domain naming standard is based on Thai characters and symbols as specified in TIS 620-2533: Standard for Thai Character Codes for Computers.

This kind of URL encoding is not a national standard, but rather a system used by the domain name registrar ThaiURL.com. It is one of many localized naming schemes that predate standardisation of Internationalized domain names (IDNA); at the moment the two systems appear to coexist. The ccTLD name registrar for .th, thnic.net, supports IDNA; ThaiURL registers .com names.