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DNS Guide Thailand

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

Contents

  1. What is DNS
  2. DNS
  3. DNS Record
  4. Record AAAA Record
  5. MX Record
  6. CNAME Record
  7. What is TTL DNS
  8. What is DNS Propagation
  9. DNS

What is DNS

DNS (Domain Name System) translates human-readable domain names like "google.com" into IP addresses like "142.250.185.14" that computers use to connect. It functions as the internet's phone book, using DNS Resolvers, Root Nameservers, TLD Nameservers, and Authoritative Nameservers.

DNS

When you type a domain, your browser queries a DNS Resolver (your ISP's or a custom one like 8.8.8.8). If not cached, the Resolver queries Root Nameserver → TLD Nameserver → Authoritative Nameserver, which returns the IP address. The browser then connects to that IP.

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DNS Record

DNS Records are data sets defining where a domain points. The most commonly used are A Records, AAAA Records, MX Records, CNAME Records, TXT Records, and NS Records — each serving a distinct purpose.

Record AAAA Record

A Record is the most fundamental DNS record, pointing a domain or subdomain to an IPv4 server address. AAAA Records do the same for IPv6. Modern setups should configure both for full compatibility.

MX Record

MX (Mail Exchanger) Records specify which mail server handles email for your domain, with Priority numbers (lower = higher priority). Multiple MX records provide redundancy.

CNAME Record

CNAME (Canonical Name) Records create aliases pointing one domain to another — like www.example.com → example.com or shop.example.com → store.shopify.com. Important: CNAME cannot be set at the root domain (@).

What is TTL DNS

TTL (Time to Live) defines how long DNS Resolvers cache your records in seconds. Low TTL (300 = 5 min) enables fast propagation but increases DNS server load. High TTL (86400 = 1 day) reduces queries but slows changes.

What is DNS Propagation

DNS Propagation is the time it takes for DNS changes to spread globally — typically 1-48 hours, though often much faster with low TTL settings. During propagation, some visitors may see the old site while others see the new one.

DNS

Common DNS issues: "Server Not Found" despite correct domain, email delivery failures, or SSL certificates not issuing. Debug by checking DNS records with nslookup or dig, and verify nameservers point correctly.

Frequently Asked Questions (FAQ)

How long does DNS Propagation take?
It depends on the TTL you set. If the TTL is 86400 (1 day), you might wait as long as 48 hours in the worst case. But if you set the TTL to 300 (5 minutes) in advance, it usually finishes within 15-30 minutes. Today most ISPs Refresh DNS every 1-4 hours.
Why does the website still point to the old place after changing the IP?
Because your DNS Resolver or ISP still has a Cache. Try to Flush DNS (ipconfig /flushdns on Windows or sudo systemd-resolve --flush-caches on Linux), or temporarily switch to a DNS such as 8.8.8.8.
How is Cloudflare DNS Proxy (orange) different from DNS Only?
The orange Proxy makes Traffic run through Cloudflare to get CDN + DDoS + SSL from Cloudflare. DNS Only (gray cloud) points DNS directly to the Origin Server, not through Cloudflare at all.
What is a TXT Record used for?
A TXT Record stores Text data for many purposes, such as SPF for Email Authentication, the DKIM Key, the DMARC Policy, Domain Verification for Google/Facebook, and the ACME Challenge for an SSL Certificate.