📋 Table of Contents
The .co.th domain is one of the most credibility-building domain extensions for Thai businesses. Because of its strict eligibility requirements — only registered Thai legal entities or trademark holders can apply — it signals legitimacy and local presence to Thai internet users. This guide covers everything you need to know for 2026.
1. What is a .co.th Domain?
The .co.th is a country-code second-level domain under Thailand's top-level domain .th. The "co" stands for "commercial," indicating business use. It is managed by the Thai Network Information Center (THNIC Foundation), which oversees all .th domain registrations in Thailand.
Due to stricter requirements compared to generic domains like .com or .net, the .co.th extension carries higher credibility among Thai internet users and signals that the business is a registered Thai entity.
2. Who Can Register a .co.th Domain?
According to THNIC policy, eligible registrants include:
- Thai legal entities registered with the Department of Business Development (DBD), such as limited companies or limited partnerships
- Foreign companies with a Thai branch office, where the branch is registered as a tax agent in Thailand
- Trademark holders with a mark registered with Thailand's Department of Intellectual Property (DIP) that matches the domain name
Individual persons or unregistered businesses cannot register .co.th. Alternatives include .in.th or .com.
3. Required Documents
Prepare the following documents before beginning the registration process:
| Applicant Type | Required Documents |
|---|---|
| Thai Company | DBD Company Certificate (max 6 months old) + authorized signatory ID |
| Foreign Company (Thai branch) | Thai branch registration + foreign company documents (English) + power of attorney |
| Trademark Holder | DIP trademark registration certificate matching the domain name |
abc.co.th — not a different name.
4. Step-by-Step Registration Process
- Check Availability — Search for your desired domain using your registrar's domain search tool
- Prepare Documents — Scan or photograph the DBD company certificate (must be within 6 months)
- Apply Through a Registrar — Fill in your contact information (name, address, phone, email)
- Submit Documents — Upload document files for verification
- Pay Registration Fee — Pay at least 1 year in advance
- Wait for Approval — THNIC reviews documents and approves within 1–3 business days
- Configure DNS — Point your nameservers to your desired hosting provider
5. Costs and Pricing
| Item | Price (THB) | Notes |
|---|---|---|
| .co.th Registration (Year 1) | 800–1,200 | Varies by registrar |
| Annual Renewal | 800–1,200 | Same as year 1 |
| Document Verification Fee | 0–200 | Some registrars charge extra |
| Transfer Fee | 0–500 | Depends on policy |
6. Comparing .co.th with Other Domains
| Domain | Eligibility | Documents | Price/Year | Trust Level (TH) |
|---|---|---|---|---|
| .co.th | Thai legal entities / trademark | Required | 800–1,200 THB | ⭐⭐⭐⭐⭐ |
| .in.th | Thai individuals/organizations | ID card/registration | 600–900 THB | ⭐⭐⭐⭐ |
| .th | Thai organizations | Required | 800–1,500 THB | ⭐⭐⭐⭐⭐ |
| .com | Anyone | Not required | 350–600 THB | ⭐⭐⭐ |
| .net | Anyone | Not required | 400–700 THB | ⭐⭐⭐ |
7. Important Tips Before Registering
- One company, one domain — Each Thai legal entity can typically register only one .co.th domain
- Name must match — The domain name must reflect your company name or trademark
- Renew before expiry — Once a .co.th domain expires and someone else registers it, you cannot reclaim it
- DNS Propagation — After changing nameservers, allow 24–48 hours for global DNS propagation
- Document freshness — DBD certificates must not be older than 6 months at the time of submission
8. Choosing Hosting for Your .co.th
After securing your .co.th domain, the next step is choosing appropriate hosting. For Thai businesses targeting local users, hosting in Thailand or nearby Asia is recommended for optimal speed.
AsiaGB.com offers hosting across multiple data centers — Thailand, Singapore, and OVHcloud Oregon (US-WEST-OR) — with 99% Uptime SLA, SSD storage, and DirectAdmin control panel, backed by Thai-language support.
Register .co.th + Hosting Bundle
AsiaGB.com provides .co.th domain registration with high-performance hosting across Asia and the US.
Register .co.th Now9. Frequently Asked Questions
10. Summary
The .co.th domain is the premier choice for Thai businesses wanting to demonstrate local credibility and official status. While the registration process requires more steps than generic domains, the trust and brand recognition it provides are well worth it.
Key takeaways for registering .co.th:
- Confirm you are a registered Thai legal entity or trademark holder
- Prepare a valid DBD company certificate (within 6 months)
- Choose a reliable registrar, submit documents, and pay
- Wait 1–3 business days for THNIC approval
- Configure DNS to point to your hosting and go live
AsiaGB.com provides both .co.th domain registration and hosting services across Southeast Asia. Contact our support team 24/7 for assistance.