How Does a Browser Know Where a Website Lives?
Think about it for a second. You type "google.com" into your browser, hit Enter, and boom—Google's homepage appears. But here's the thing: computers don't actually understand "google.com." They work with numbers. Long, complicated numbers called IP addresses that look like 142.251.43.110.
So how does your browser figure out which number to call when you type in a friendly name like "google.com"? That's where DNS comes in, and it's one of the most clever systems on the internet.
What is DNS? (The Simple Version)
DNS stands for Domain Name System, but forget the technical name for a moment. Think of DNS as the internet's phone book.
Remember old phone books? You look up someone's name (like "Ashish Singodiya") to find their phone number. DNS does exactly that for websites. You give it a name (like "ashish.pro"), and it gives you back the number (the IP address) that your computer needs to actually connect to that website.
Without DNS, you'd have to memorize that Google lives at 142.251.43.110. Can you imagine? DNS saves us from that nightmare by letting us use memorable names instead.
Why DNS Records Are Needed
Here's where it gets interesting. DNS isn't just a simple name-to-number lookup. A single website needs to handle a lot more than just "where do I find the homepage?"
Think about your own home address. You don't just have one piece of information. You have:
Your street address (where you live)
Your name (who lives there)
The local post office that serves your area
Websites are similar. They need:
That's why DNS uses different types of records. Each record type solves a specific problem. Let's look at them one by one.
NS Record: Who's Responsible for This Domain?
The Problem It Solves: When someone asks about "example.com," which DNS server should answer that question?
Think of NS (Name Server) records as the directory at a large office building. Before you can find a specific person, you need to know which department they work in. NS records tell the internet, "If you want to know anything about this domain, ask these specific DNS servers."
Real-Life Example: Imagine you run a company called "Kadak Chai." You could manage all your own phone calls, or you could hire a receptionist service. NS records are like saying, "All questions about Kadak Chai? Call our receptionist service at 123-CHAICODE."
When you register a domain, you're essentially telling the internet's central directory: "For anything about mydomain.com, the authoritative answers come from these name servers."
What It Looks Like:
example.com. NS elliott.ns.cloudflare.com.
example.com. NS hera.ns.cloudflare.com.
This means: The hosting cloudflare's name servers are in charge of all DNS information for example.com.
A Record: Finding Your Website's Home (IPv4)
The Problem It Solves: Where exactly does this domain name point to?
This is the most fundamental record. When you type "example.com" into your browser, the A record tells your computer the exact IPv4 address where that website lives.
Real-Life Example: You tell someone, "Let’s meet at the B.Tech Chai Cafe." The cafe’s name is easy to remember, but it’s not enough to physically get there. To actually reach the cafe, the person needs its exact street address, such as "27 Tea Street, Near Hawa Mahal Plaza, C Scheme, Jaipur." In this case, the cafe name acts as a friendly label, while the street address points to the real location. An A record works in the same way, it translates a human-friendly domain name into the server’s actual IP address, allowing browsers to locate and connect to the correct server.
What It Looks Like:
example.com. A 192.0.2.1
www.example.com. A 192.0.2.1
This tells the internet: "When someone asks for example.com, send them to the server at 192.0.2.1."
Notice that you can have different A records for different subdomains. You might want "example.com" and "www.example.com" to go to the same place, but "blog.example.com" could point to a completely different server.
AAAA Record: The IPv6 Version
The Problem It Solves: The same as A records, but for the newer internet addressing system.
The internet is running out of IPv4 addresses (those addresses that look like 192.0.2.1). We only have about 4.3 billion of them, and with billions of devices online, we needed more. So we introduced IPv6.
IPv6 addresses look like this: 2001:0db8:85a3:0000:0000:8a2e:0370:7334. Way longer, way more complicated, but we have practically unlimited addresses now.
Real-Life Example: Imagine your city ran out of street addresses, so they introduced a new system with more digits and letters. Old addresses still work (IPv4), but new buildings get the new-style addresses (IPv6). Your house might have both—the old address for old GPS systems and the new address for modern ones.
What It Looks Like:
example.com. AAAA 2001:0db8:85a3::8a2e:0370:7334
Most websites today have both A records (for older systems) and AAAA records (for modern systems). Your browser is smart enough to use whichever one it can.
CNAME Record: One Name Points to Another
The Problem It Solves: What if you want multiple names to point to the same place without managing multiple IP addresses?
CNAME stands for "Canonical Name," which is fancy talk for "the real name." A CNAME record says, "Don't look at me, go ask that other name instead."
Real-Life Example: Think of a famous product like Sprite. If you ask a business directory, "Where is the Sprite corporate office?" the answer isn't a unique street address for Sprite. Instead, the directory says, "Sprite is a brand owned by The Coca-Cola Company. Look up the address for The Coca-Cola Company." That’s a CNAME. It redirects the question from the brand name to the parent company’s name.
Common Confusion: A vs CNAME
Here's where people get tripped up:
A Record: "This name equals this IP address" (direct answer)
CNAME Record: "This name equals that other name, go ask them" (redirect to another name)
You use A records when you control the server and know its IP address. You use CNAME records when you're pointing to someone else's infrastructure, like a CDN, email service, or hosting platform.
Important Rule: You typically can't use a CNAME for your root domain (example.com). Only for subdomains (www.example.com, blog.example.com). This is a technical limitation, but most people solve it by using an A record for the root and CNAME for subdomains.
MX Record: How Email Finds Your Mail Server
The Problem It Solves: Email sent to you@example.com needs to know which mail server to deliver to.
Email doesn't go to the same server as your website. Your website might be hosted on one server, but your email could be handled by Gmail, Microsoft, or a specialized email service. MX (Mail Exchange) records tell the internet's email system where to deliver mail for your domain.
Real-Life Example: Your home address and your PO Box are different places. When someone sends you a package, they need to know which address to use. MX records are like saying, "All mail for the Smith family goes to PO Box 789 at the downtown post office."
What It Looks Like:
example.com. MX 10 mail1.emailprovider.com.
example.com. MX 20 mail2.emailprovider.com.
The numbers (10, 20) are priorities. Lower numbers are tried first. So if mail1.emailprovider.com is down, the email system will try mail2.emailprovider.com instead. It's a built-in backup system.
Common Confusion: NS vs MX
Both sound similar but do very different things:
Think of NS as the building manager who knows about everything in the building, while MX is the mailroom that only handles packages and letters.
The Problem It Solves: How do you prove you own a domain, add notes, or configure services?
TXT record tells computers something about the domain. It is most commonly used to prove you are the real owner of a website or to give permission to email services to send mail on your behalf.
Real-Life Example: Think of a TXT record like a sticky note attached to your front door. When a delivery driver (like Google or Microsoft) arrives, they don’t need the note to find your house—they are already there. Instead, they read the note to verify information, such as: "I am the homeowner, here is my ID code for verification." It doesn't change your address; it just provides the necessary "proof" or "instructions" for specific services to interact with you.
What It Looks Like:
example.com. TXT "v=spf1 include:_spf.google.com ~all"
example.com. TXT "google-site-verification=abc123def456"
Common Uses:
Email Authentication (SPF): Proves which servers are allowed to send email on your behalf. This helps prevent spammers from forging emails that look like they're from you.
Domain Verification: When you set up Google Workspace, Facebook Business, or other services, they often ask you to add a specific TXT record to prove you own the domain.
Security Policies (DMARC, DKIM): These help protect your email domain from being used in phishing attacks.
Site Verification: Search engines and other services use TXT records to verify ownership.
The beauty of TXT records is they're flexible. As new internet standards emerge, TXT records can support them without needing new DNS record types.
How DNS Records Work Together: A Complete Example
Let's see how all these records work together for a real website. Imagine you're setting up "mybakery.com"—a website for your bakery business.
Your Setup:
Main website hosted on a web hosting service
Blog on a separate platform (like WordPress.com)
Email through Google Workspace
Online store through Shopify
Your DNS Records Would Look Like:
; NS Records - Who's in charge
mybakery.com. NS ns1.hosting-company.com.
mybakery.com. NS ns2.hosting-company.com.
; A Records - Main website location
mybakery.com. A 198.51.100.1
www.mybakery.com. A 198.51.100.1
; AAAA Records - IPv6 version
mybakery.com. AAAA 2001:db8:85a3::8a2e:370:7334
; CNAME Records - Pointing to other services
blog.mybakery.com. CNAME mybakery.wordpress.com.
shop.mybakery.com. CNAME shops.myshopify.com.
; MX Records - Email delivery
mybakery.com. MX 10 aspmx.l.google.com.
mybakery.com. MX 20 alt1.aspmx.l.google.com.
; TXT Records - Verification and security
mybakery.com. TXT "v=spf1 include:_spf.google.com ~all"
mybakery.com. TXT "google-site-verification=your-verification-code"
What Happens When Someone Visits Your Site:
Someone types mybakery.com: Their browser asks DNS, "Where is mybakery.com?"
DNS checks the NS records: "Oh, for mybakery.com info, I need to ask ns1.hosting-company.com."
The name server responds with the A record: "mybakery.com is at 198.51.100.1"
The browser connects: Using that IP address, the browser loads your website.
What Happens When Someone Sends Email:
Someone sends email to you@mybakery.com: Their email server asks DNS, "Where do I deliver mail for mybakery.com?"
DNS checks the MX records: "Mail goes to aspmx.l.google.com (priority 10)"
Email server delivers: The email is sent to Google's servers, not your website server.
SPF verification: Google checks the TXT record to verify the email is legitimate.
What Happens When Someone Visits Your Blog:
Someone types blog.mybakery.com: Their browser asks DNS for this address.
DNS finds the CNAME: "blog.mybakery.com points to mybakery.wordpress.com"
DNS follows the chain: Looks up mybakery.wordpress.com and gets WordPress's IP address.
Browser connects: WordPress's server delivers your blog.
See how they all work together? Each record type has a specific job, and together they create a complete system that routes website traffic, email, and services to the right places.
The Magic Happens Behind the Scenes
The beautiful thing about DNS is that it all happens in milliseconds, completely invisibly. You don't think about it, your visitors don't think about it, but it's working every single time someone visits your site or sends you an email.
DNS records are like the backstage crew of a theater production. The audience never sees them, but without them, the whole show falls apart. When you understand how they work, you can:
Set up custom email addresses with confidence
Point different parts of your domain to different services
Verify your domain with third-party services
Troubleshoot issues when things go wrong
Make changes without breaking your website
DNS is one of those technologies that just works remarkably well. It's been running the internet for decades, handling billions of requests per second, making sure that when you type a name, you get to the right place. Pretty amazing when you think about it.
