DNS Record Types

How does a browser know where a website lives?

Suppose you open the gallery on your phone and see various photos stored in your phone’s internal memory. Those photos exist somewhere physically inside your device, and your phone knows exactly where to find them.

But what happens when you type www.google.com in your browser? The website isn’t stored on your device. Websites like Google are stored on special computers called servers somewhere on the internet.

Your browser asks the Domain Name System (DNS) to translate the website name into an IP address (the real location of the server). Then it connects to that server and loads the website for you.

What is DNS?

DNS (Domain Name System) is the system that translates human-friendly website names into IP addresses that computers use to identify each other on the internet.

DNS is often called the “phonebook of the internet” because it connects names to numbers, just like a traditional phonebook does.

When you type a website like www.google.com into your browser:

1. You know the website name (like a person’s name).

2. Your computer doesn’t understand names - it needs an IP address (like a phone number).

3. DNS looks up the IP address for that website and gives it to your browser.

4. Your browser uses that IP address to connect to the correct server.

DNS uses different types of DNS Records to get the IP Address.

What are DNS Records?

DNS records are instructions stored in the Domain Name System (DNS) that tell the internet (browser) how to handle a domain name. They are the backbone of how domain names (likewww.google.com) are translated into IP addresses (like 142.251.40.142) so computers can communicate.

Why DNS Records are needed?

DNS records are needed because they tell the internet how to find and interact with your domain. Without them, a domain name would just be a name - computers wouldn’t know where to send traffic for websites, email, or other services.

• Delegation of Responsibility

  • NS records tell the world which servers are authoritative for your domain.

  • Without NS records, no one knows who to ask for your domain info.

• Translate Names to IPs

  • The A record (or AAAA record for IPv6) tells computers the IP address of your website.

  • Without it, typing example.com wouldn’t go anywhere.

• Alias or Redirection

  • CNAME records let you point one domain to another (like www.google.com → google.com).

  • Makes managing multiple subdomains easier.

• Direct Email Traffic

  • MX records specify which mail servers handle email for your domain.

  • Without MX records, emails sent to your domain would get lost.

• Security and Verification

  • DNS records (like TXT) prove your domain is yours and stop fake emails

  • Without them, your emails might be marked as spam.

What is an NS Record ?

An NS record (Name Server record) tells the internet which servers are responsible for managing a domain. In other words, it points to the DNS servers that “know” all the other records for that domain.

Example :
If example.com has NS records pointing to ns1.host.com and ns2.host.com, anyone wanting information about example.com must first ask these servers. Those servers then provide the actual records like A, MX, or CNAME.

What is an A Record?

An A record (Address record) maps a domain name to an IPv4 address, which is the server’s location on the internet.

Example:

• NS record: google.com → ns1.google.com, ns2.google.com tells the world which servers hold the official DNS info for google.com.

• A record: google.com → 142.251.40.142 gives the IP address of Google’s server.

• When you type google.com in your browser, your computer asks the NS servers, gets the A record, and connects to 142.251.40.142.

What is an AAA record?

An AAA Record maps a domain name to an IPv6 address. It’s essentially the IPv6 version of an A record.

Example:

• NS record: google.com → ns1.google.com, ns2.google.com tells the world which servers hold the DNS info for google.com.

• AAAA record: google.com → 2607:f8b0:4006:820::200e gives the IPv6 address of Google’s server.

• When you type google.com in your browser, your computer asks the NS servers, gets the AAAA record, and connects to 2607:f8b0:4006:820::200e.

What is CNAME Record?

A CNAME record (Canonical Name record) allows one domain name to point to another domain name instead of directly pointing to an IP address . It’s like an alias — when someone visits the first domain, the DNS system looks up the second domain to get its IP.

Example:

• NS record: google.com → ns1.google.com, ns2.google.com tells the world which servers hold the official DNS info for google.com.

• CNAME record: www.google.com → google.com makes www.google.com an alias of google.com.

• When you type www.google.com in your browser, your computer asks the NS servers, sees the CNAME, then looks up google.com’s A or AAAA record, and connects to the corresponding IP.

What is an MX Record?

An MX record (Mail Exchange record) is a DNS record that tells the internet which mail server should receive emails for your domain.

It direct email traffic to the correct server for your domain. Without an MX record, other servers won’t know where to deliver your emails.

Example:

• MX record: google.com → ASPMX.L.GOOGLE.COM directs emails sent to @google.com addresses to Google’s mail server.

• When someone sends an email to user@google.com, their mail server asks the NS servers, gets the MX record, and delivers the email to ASPMX.L.GOOGLE.COM.

What is a TXT Record?

A TXT record (Text record) is used to store arbitrary text information about a domain. It’s commonly used for verification, authentication, and other extra data that doesn’t fit into A, AAAA, CNAME, or MX records.

Example:

• TXT record: google.com → "v=spf1 include:_spf.google.com ~all" is used to verify that Google’s servers are allowed to send emails for the domain.

• When someone sends an email from @google.com, the recipient’s mail server can check the TXT record to confirm it’s coming from an authorized server.

How all DNS records work together for one website?

• NS records

  • google.com → ns1.google.com, ns2.google.com

  • Tells the world which servers hold the official DNS info for the domain. Every query starts here.

• A & AAAA records

  • google.com → 142.251.40.142 (A record, IPv4)

  • google.com → 2607:f8b0:4006:820::200e (AAAA record, IPv6)

  • Provide the actual IP addresses that browsers connect to when visiting the website.

• CNAME records

  • mail.google.com → google.com

  • Creates an alias so subdomains can point to the same server without needing separate A/AAAA records.

• MX records

  • google.com → ASPMX.L.GOOGLE.COM

  • Direct emails sent to @google.com addresses to Google’s mail server.

• TXT records

  • google.com → "v=spf1 include:_spf.google.com ~all"

  • Provides verification and security information, like which servers can send email for the domain.