What Documents Do You Need to Register a .co.th Domain?

Why Does .co.th Require Documents?

Unlike global domains such as .com, the .co.th domain is managed by THNIC (Thailand Network Information Center), which requires all applicants to verify their identity and demonstrate a clear connection between the requested domain name and their name or organization. This policy prevents misuse of Thai country-code domains.

As a result, .co.th domains carry a high level of trust — every registered .co.th domain belongs to a verified individual or organization based in Thailand. Internet users in Thailand can be confident that any .co.th website represents a legitimate, identifiable entity.

Documents Required for Individuals

If you are registering as a private individual (not a company or organization), you will need to prepare the following:

• A copy of your Thai National ID Card (must not be expired), signed with a certification that the copy is accurate
• For foreign nationals, a copy of your Passport may be used instead

Domain Name Requirements for Individuals

THNIC requires that the .co.th domain name be related to the applicant's name or commonly used alias. For example:

• A person named Somchai Jaidee may register somchai.co.th or somchaijaidee.co.th
• A personal brand name or pen name may be accepted if supporting documentation can establish the connection
• Domain names with no clear connection to the applicant's identity will not be approved

Documents Required for Companies and Organizations

If you are registering on behalf of a company, partnership, foundation, or government agency, the following documents are required:

• Company Registration Certificate or organization founding documents issued by the Department of Business Development (must be issued within the last 6 months)
• A copy of the National ID Card of the authorized director or designated representative
• If a proxy is acting on behalf of the company, a Power of Attorney (with a 30-baht revenue stamp affixed) plus copies of ID cards for both the grantor and the authorized agent are required

Domain Name Requirements for Companies

The requested domain name must correspond to the company's registered name or trade name. For example, a company called "Siam Commerce Co., Ltd." may register siamcommerce.co.th but cannot register an unrelated brand name without supporting documentation.

Applicant Type	Primary Document	Additional Document
Individual (Thai national)	Copy of National ID Card	—
Individual (Foreign national)	Copy of Passport	—
Company / Partnership	Company Registration Certificate	Copy of authorized director's ID
Foundation / Association	Organization founding document	Copy of authorized person's ID
Government agency	Official letter from the agency	Government employee ID of applicant

Document Checklist by Registration Basis

THNIC allows .co.th registrations on several different bases (registration basis) — not just a company registration certificate. Each basis requires a different set of documents. If the domain name you want does not exactly match your company name, you may still be able to register it by referencing a trademark or other connecting document. The table below summarizes the documents you need to prepare for each registration basis, so you can choose the path that best fits your business before you apply.

If a director cannot submit the documents in person, they may authorize a staff member or coordinator to do so by attaching a Power of Attorney with a 30-baht revenue stamp, plus copies of the National ID cards of both the grantor and the authorized agent. Every copy should be signed to certify accuracy and annotated with a note such as "for domain registration only" to protect the information.

Step-by-Step: How to Register a .co.th Domain

Registering a .co.th domain through an accredited registrar such as AsiaGB is straightforward once your documents are ready. The full process is as follows:

1. Check that the domain name is available — search for your preferred name first; if it is already taken you will need to choose another
2. Choose your registration basis — decide whether to register under a company, a trademark, or as an individual, so you know which document set to prepare
3. Prepare and scan your documents — make clear copies or scans as PDF/JPG files and sign each page to certify accuracy
4. Order and pay — place the registration order through your registrar and pay the 800 THB/year fee
5. Submit verification documents — upload the documents into the system or send them to the support team for a preliminary check before they go to THNIC
6. Wait for THNIC review and approval — this usually takes 1–3 business days when documents are complete and the name is correct
7. Configure DNS and go live — once approved, the domain becomes active immediately and you can set A records / MX records through the Client Area

How Is .in.th Different from .co.th?

The .in.th domain was designed for individuals and small businesses without a legal company structure. The main condition is:

• The applicant must already hold an active .co.th domain and the requested .in.th name must be related — or
• The applicant can submit identity documents (National ID Card or Company Registration Certificate) to verify eligibility

The naming rules for .in.th are more flexible — the domain name does not need to directly match the applicant's legal name, as long as it does not infringe on trademarks or legally protected names.

.co.th vs .th vs .in.th — What's the Difference?

The .th country-code domain has several sub-extensions, each designed for a different group of users. Choosing the right one from the start keeps your website's image aligned with the nature of your organization and reduces the chance of rejection for using the wrong category. Here are the main differences:

In short: if you are a company and want maximum credibility with Thai customers, choose .co.th. If you are an individual or a small shop without a registered legal entity, .in.th is more flexible. The .th extension suits organizations that want a short name and are ready to meet the stricter document conditions.

Approval Timeline and Process

Once you have submitted complete documents, THNIC reviews and approves registrations as follows:

1. Submit the application via a Registrar (such as AsiaGB) along with the required documents
2. The Registrar forwards your documents to THNIC within 1 business day
3. THNIC reviews the application — this typically takes 1–3 business days if all documents are correct and the domain name meets requirements
4. Approval and activation — once approved, the domain becomes active and you can configure DNS records immediately

Why .co.th Applications Get Rejected — and How to Fix It

The reasons a .co.th application is rejected usually come down to a handful of recurring issues, mostly involving documents and the connection between the domain name and the applicant. Knowing them in advance helps you get approved on the first try without resubmitting:

• Domain name does not match the company name — for example, a company called "Siam Commerce" applying for luckyshop.co.th. The fix is to choose a name that matches the company, or register that name as a trademark first and use it as your basis.
• Company certificate has expired — THNIC only accepts certificates issued within the last 6 months. If yours is older, request a new one from the Department of Business Development.
• Unclear copies or missing certification signatures — scan documents clearly so the registration number is legible, and sign each page to certify accuracy.
• Power of Attorney without a revenue stamp — when someone else submits on your behalf, the POA must carry a 30-baht revenue stamp and include ID copies of both parties.
• Domain name conflicts with another party's trademark — even if the name matches your company, if it overlaps with a trademark registered by someone else it may receive special review. Check in advance.

Thai Domain Pricing at AsiaGB

AsiaGB has been providing domain registration services since 2007 — over 19 years of experience in Thai web hosting. We offer competitive pricing with a support team ready to help you prepare the correct documents:

Domain Extension	Price per Year	Documents Required
.com	500 THB	No
.co.th	800 THB	Yes (ID Card or Company Certificate)
.in.th	600 THB	Yes (ID Card, or existing .co.th)

All domains registered with AsiaGB include free DNS Management. You can add, edit, or remove DNS records through the Client Area as soon as your domain is approved.

Frequently Asked Questions About .co.th Documents

Can I register a .co.th domain without a company?

In some cases, yes. If you hold a trademark registered in Thailand and the domain name matches that trademark, you can use it as your registration basis. If you have neither a registered company nor a trademark, we recommend choosing a .in.th domain instead, which can be registered as an individual using only a copy of your National ID.

How long until the domain is usable?

Once you submit complete documents and the domain name is correct, THNIC takes about 1–3 business days to review. After approval the domain becomes active immediately and you can configure DNS right away. If documents are incomplete or the name is not approved, you may need to resubmit, which takes longer.

How much does a .co.th domain cost at AsiaGB?

The .co.th registration fee at AsiaGB is 800 THB per year, including free DNS Management and a support team that reviews your documents before they are sent to THNIC.

Do documents need to be in English?

No. Thai official documents such as the company certificate and National ID can be submitted in Thai as normal. Foreign nationals using a passport can submit it as shown in that document.