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Subdomain Thailand Guide

By CloudPicked Review Team•Updated 14 June 2026•5 min read
Subdomain Thailand Guide

Contents

  1. What is Subdomain
  2. Subdomain
  3. Subdomain vs Subdirectory
  4. Setup: DNS Subdomain
  5. Setup: Subdomain Hosting
  6. Subdomain SEO
  7. Wildcard Subdomain
  8. Subdomain
  9. Verdict: Subdomain

What is Subdomain

A subdomain is a prefix segment of a domain name. If the main domain is example.com, then blog.example.com, shop.example.com, or mail.example.com are subdomains — each can point to different IP addresses or servers.

Subdomain

Subdomains have many uses: separating a blog from the main site, isolating an e-commerce store, creating staging environments for testing, API endpoints, CDN for images, mobile versions of websites, or regional sites.

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Subdomain vs Subdirectory

Subdomain (blog.example.com) vs Subdirectory (example.com/blog): subdomains create separate entities that can be hosted on different servers with different CMS. Subdirectories use the same server and configuration, and are generally simpler for SEO.

Setup: DNS Subdomain

Create a subdomain by adding an A Record or CNAME Record to the domain's DNS zone. If the subdomain points to the same IP as the root domain, use an A Record with the same IP. If pointing to another domain (CDN, GitHub Pages), use a CNAME Record.

Setup: Subdomain Hosting

In cPanel or DirectAdmin, go to Subdomains section, add the subdomain name (e.g., blog) and document root (e.g., /public_html/blog). The system automatically creates the folder. Upload files to that folder and the subdomain is ready.

Subdomain SEO

Subdomains and subdirectories affect SEO differently. Google treats subdomains as separate entities — sometimes requiring rebuilding authority. Subdirectories share the root domain's authority. For blogs or SEO-driven content, subdirectories are generally preferable.

Wildcard Subdomain

Wildcard subdomain (*.example.com) accepts requests for any subdomain not explicitly defined — used for multi-tenant applications like username.example.com or customer.example.com. Requires wildcard DNS A Record and hosting support for wildcards.

Subdomain

Popular real-world subdomain examples: docs.example.com for documentation, status.example.com for status pages, app.example.com for web apps, en/th.example.com for multilingual sites, m.example.com for mobile versions.

Verdict: Subdomain

Step-by-step: 1. Add DNS Record (A or CNAME) at DNS provider 2. Wait 30 min to 24 hours for propagation 3. Configure at hosting (cPanel/DirectAdmin) 4. Request SSL certificate for subdomain 5. Test HTTPS functionality.

Frequently Asked Questions (FAQ)

Which is better for a blog, a subdomain or a subdirectory?
For a blog on an existing site, a subdirectory (example.com/blog) is recommended over a subdomain, because it shares the authority of the root domain, improving SEO faster. The exception is if you want the blog on a different platform, such as WordPress alongside Ghost, in which case use a subdomain.
Do I need to buy SSL separately for a subdomain?
It depends on the SSL type. If you buy a Wildcard SSL (*.example.com), it covers all subdomains. Free Let's Encrypt can issue an SSL per subdomain without limit; Let's Encrypt also offers Wildcard SSL, but it must be done via a DNS challenge.
Can one subdomain host multiple websites?
Not directly. A subdomain points to a single IP/server, but that server can have multiple virtual hosts per single IP via name-based virtual hosting. So a single IP can have multiple sites, but a single subdomain name can point to only one place at a time.
Does a subdomain affect email?
A subdomain doesn't affect the main email. If email uses mail.example.com as the MX record while blog.example.com is a separate record, the DNS doesn't affect each other. But if you want email on a subdomain, you must set up a separate MX record for it too.