DNS Record Types Explained

How does a browser know where a website lives?

When I type a website like example.com,
my browser somehow finds the correct server.

But computer does not understand names.
Computer understands numbers (IP addresses).

So question is:
How name becomes number?

Answer is DNS.

What is DNS

DNS (Domain Name System) is like phonebook of the internet.

• You remember name → “Google”

• Phonebook gives number → “123…”

Same way:

• Browser has domain name

• DNS gives IP address

So browser knows where to go.

Why DNS records are needed

DNS records are instructions stored in DNS.

They tell:

• where website is hosted

• where email should go

• who controls the domain

• extra verification info

Without DNS records:

• website won’t open

• emails won’t work

High-level DNS flow

Browser
  ↓
DNS Server
  ↓
IP Address
  ↓
Website Server

What is an NS Record

NS (Name Server) record tells:
who is responsible for this domain

It is like:

• “Which office handles this address?”

Example:

example.com → ns1.host.com
example.com → ns2.host.com

NS records point to DNS provider.

Without NS record, no DNS works at all.

What is an A Record

A record maps:
domain name → IPv4 address

Example:

example.com → 93.184.216.34

Think like:

• House name → house number

This is most common DNS record.

What is an AAAA Record

AAAA record is same as A record,
but for IPv6 address.

Example:

example.com → 2001:db8::1

Simple:

• A = IPv4

• AAAA = IPv6

What is a CNAME Record

CNAME means:
one name points to another name

Example:

www.example.com → example.com

So:

• browser asks for www.example.com

• DNS says “go to example.com”

Diagram

www.example.com
        ↓
   example.com
        ↓
     IP address

Common confusion: A vs CNAME

• A record points to IP

• CNAME points to another domain name

Rule:

• Root domain → usually A record

• Subdomain → often CNAME

What is an MX Record

MX (Mail Exchange) record is for emails.

It tells:
where emails should be delivered

Example:

example.com → mail.google.com

If MX record is wrong:

• emails will not arrive

Email flow using MX record

Email sender
   ↓
DNS (MX record)
   ↓
Mail server

What is a TXT Record

TXT record stores extra information.

Used for:

• domain verification

• email security (SPF, DKIM)

• ownership proof

Example:

"google-site-verification=xyz"

Humans rarely read TXT records,
machines use them.

NS vs MX

• NS → who controls DNS

• MX → who handles email

Different jobs, different records.

How all DNS records work together

One website usually uses many records.

Example setup:

NS     → DNS provider
A      → Website IP
CNAME  → www → main domain
MX     → Email server
TXT    → Verification / security

All together, website and email work properly.

One complete DNS setup

example.com
 ├── NS → DNS provider
 ├── A  → Web server IP
 ├── CNAME → www.example.com
 ├── MX → Mail server
 └── TXT → Verification

Short Summary

• DNS is the phonebook of the internet

• It converts domain names into IP addresses

• DNS records give instructions to internet

• NS decides who controls the domain

• A / AAAA map domain to IP

• CNAME points one name to another

• MX handles emails

• TXT stores extra verification data