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Introduced 1988
TLD type Country code top-level domain
Status Active
Registry THNIC
Sponsor THNIC
Intended use Entities connected with  Thailand
Actual use Popular in Thailand
Registered domains 68,036 (April 22, 2018)[1]
Registration restrictions Varying restrictions based on which second-level name registration is within
Structure Registrations are at third level beneath various categories
Registry Website THNIC

.th is the Internet country code top-level domain (ccTLD) for Thailand.

It is administered by T.H.NIC Co., Ltd. (THNIC), the corporate entity of Thai Network Information Center Foundation.


Registration of a .co.th domain name is a complicated procedure, for this reason most Thailand websites prefer to use a .com name. In order to register a .co.th domain name the registrar in Thailand requires copies of company documents in the same name as the required domain name, so for example if an entity required acme.co.th the entity would need to have a registered company called Acme Co., Ltd.

A company can only register a single .co.th domain with the company name or initial name of company, and/or one .co.th domain name per trademark.[2]

In 2018, the Foundation advance to the registration for authentic using of Persons (Natural Persons and Juristic Persons); therefore, the Foundation reserves the right to consider and decide number of domain name of each person on a case by case basis. The person who registered domain name more than one domain name from all categories must comply with the following conditions:

  • All domain name registration must comply with the Criteria of domain naming and condition as provided Specified policy by categories of domain name.
  • The registration of domain name shall be acted in good faith by a holder of domain name and a contact person who having a residential address or an office address in Thailand which can be contacted by THNIC.
  • In case THNIC detect any unusual act in domain name registration, specifically, registration of more than one domain name or may imply to not acting in good faith for domain name registration, THNIC reserves the right to refuse the request or revoke the domain name immediately.

Second-level domains[edit]

THNIC admits .th registration only third-level domain under seven groups of predefined second-level domains:[3]

For English domain names For Thai domain names[4] Eligible applicant
.ac.th .ศึกษา.ไทย Academic
.co.th .ธุรกิจ.ไทย Commercial
.go.th .รัฐบาล.ไทย Governmental
.mi.th .ทหาร.ไทย Military
.or.th .องค์กร.ไทย Non-profit organizations
.net.th .เน็ต.ไทย Internet provider
.in.th .ไทย Individuals, companies or organizations

Second top domain[edit]

Introduced 2010
TLD type Country code top-level domain
Status Active
Registry THNIC
Sponsor THNIC
Intended use Thailand Entities connected with Thailand
Actual use secondary domain name
Registered domains 18,633 (April 22, 2018)[1]
DNS name .xn--o3cw4h
Registry Website THNIC

In 2010 a new top domain was registered and introduced for Thailand, intended for domain names in the local language. This top domain is .ไทย. As of 2011, thousands of sites with this domain are active.[5]

It appears that the Thai second-level .ไทย domains are assigned directly to sites with English .in.th domain names.[4] Another groups of .th domains must use third-level .ไทย domains, as in the table above.


  1. ^ a b "เผยโดเมน '.th' ทะลุ 6 หมื่นชื่อ-ภาคธุรกิจใช้กว่าครึ่ง". Thai Rath (in Thai). 6 June 2013. Retrieved 19 October 2013. 
  2. ^ "นโยบายการให้บริการชื่อโดเมน .th และ .ไทย (ฉบับปรับปรุงปี 2556)". THNIC. THNIC. 2013-03-01. Retrieved 2014-10-14. 
  3. ^ "Policy of .th and .ไทย service" (PDF). THNIC Foundation. Thai Network Information Center Foundation. 1 April 2013. Retrieved 21 December 2013. 
  4. ^ a b "ดอทไทย" โดเมนเลือดไทย กรรมสิทธิ์เฉพาะคนไทย. Thai Rath (in Thai). 18 January 2011. Retrieved 21 December 2013. 
  5. ^ "site:.ไทย". Google. Google. Retrieved 27 May 2012. 

External links[edit]