You probably didn't wake up today excited to think about DNS. Most business owners don't even know what DNS is - and that's fine. You have a business to run.

But here's the thing: DNS is the system that lets people find your website, send you email, and connect to your services. When it works, it's invisible. When it breaks, your business is unreachable.

So while you don't need to become a DNS expert, you do need to understand what it does for your business and what can go wrong.

The Phone Book Analogy

DNS stands for "Domain Name System," but forget the technical term. Think of it like a phone book for the internet.

When someone wants to call your business, they look up your name in a phone book and find your phone number. They don't need to memorize your number - they just need to know your name, and the phone book connects it to the number.

DNS works the same way:

Your customers type yourcompany.com (your business name)
↓
DNS looks it up and finds 192.0.2.1 (the actual address)
↓
Their browser connects to that address and shows your website

Without DNS, people would have to type numerical addresses like 192.0.2.1 to reach your website. That's not practical. DNS lets them use your memorable business name instead.

What DNS Actually Does for Your Business

DNS isn't just for your website. It handles several things:

Where your website lives
DNS tells browsers where to find your website. It points yourcompany.com to the server where your website is hosted.

Where your email goes
DNS tells other email servers where to deliver email sent to you@yourcompany.com. Without correct DNS, email to your business bounces.

Security and verification
DNS includes records that prove emails from your domain are legitimate, verify your domain ownership, and enable security features.

Subdomains and services
DNS handles all your subdomains too - shop.yourcompany.com, blog.yourcompany.com, mail.yourcompany.com. It tells the internet where each one lives.

All of this is invisible when it works. You send email, it arrives. People visit your website, it loads. But DNS is making all of this happen.

Who Controls Your DNS

Your domain (yourcompany.com) is registered with a domain registrar - companies like GoDaddy, Namecheap, or Cloudflare. When you registered your domain, you created DNS records that tell the internet where to find your stuff.

But here's what confuses people: your domain registrar, your website host, and your email provider might all be different companies. Yet they all need to work together through DNS.

Example setup:

Domain registered with GoDaddy
Website hosted with Bluehost
Email through Google Workspace

DNS is what connects these pieces. Your GoDaddy account contains DNS records that say:

"For the website, go to Bluehost"
"For email, go to Google"

Change those DNS records, and you change where people end up when they try to reach your business.

Why This Matters to You

If DNS is misconfigured, your business is unreachable.

Not down - your website is still running on its server, your email server is still active. But nobody can find them. It's like your phone book entry has the wrong number.

This happens when:

You switch website hosts but don't update DNS
You change email providers but DNS still points to the old one
Someone modifies DNS records without understanding what they're changing
Your domain expires and DNS stops responding
A contractor makes changes and doesn't document them

From your perspective: "My website/email stopped working."
From a technical perspective: "Your DNS is pointing to the wrong place."

The DNS Records That Matter

You don't need to manage DNS yourself, but you should understand what's there:

A Record (Address Record)
Points your domain to the specific address where your website lives.
Business impact: This is how people find your website.

MX Record (Mail Exchange)
Points your domain to the server that handles your email.
Business impact: This is how you receive email.

TXT Records
Text records used for verification and security (like proving email legitimacy).
Business impact: Email security, domain verification for services, preventing spam.

CNAME Record (Canonical Name)
Creates an alias, like pointing www.yourcompany.com to yourcompany.com.
Business impact: Makes sure all variations of your domain work correctly.

When IT people talk about "updating DNS" or "changing an A record," this is what they're referring to. They're changing where your domain points.

Common DNS Problems

The wrong pointing
Your DNS points to your old website host, but you moved to a new one. Result: people see your old site (if it still exists) or an error page.

Missing records
You set up a new service, but forgot to add the DNS record for it. Result: the service doesn't work, and you can't figure out why.

Conflicting records
Multiple records pointing different places, confusing the system about where to send traffic.

Stale records
Old DNS entries for services you no longer use, creating confusion and potential security issues.

Propagation delays
When you change DNS, it takes time (usually 1-48 hours) for the change to spread across the internet. During this time, different people might see different versions of your site.

The Propagation Confusion

You'll hear about "DNS propagation" - the time it takes for DNS changes to spread across the internet.

Here's what's happening: When you change your DNS, you're updating your phone book entry. But there are thousands of phone books (DNS servers) around the world, and they don't all update instantly. They check for updates periodically.

So when you switch your website to a new host:

You update DNS at 9am
Some people see your new site within minutes
Others still see the old site for hours or even a day
Eventually everyone sees the new site

This is normal. It's not broken. It's just how the system works. Good IT providers plan migrations accounting for this delay.

Who Should Have Access

Your DNS controls where people end up when they try to reach your business. That's powerful, and access should be carefully controlled.

You should know:

Where your domain is registered (which company)
Who can log in to that account
Who has permission to modify DNS records

Red flags:

Your domain is registered under someone else's personal account
You don't have the login credentials to your own domain
Only one person knows how to access it, and they're leaving
You're not sure where it's registered or how to access it

If you can't log in to your domain registrar account and see your DNS records, you don't truly control your domain. This becomes a critical issue during business acquisitions or when switching IT providers.

When DNS Changes Are Necessary

DNS isn't something you change often, but you will need to change it when:

Moving your website to a new host
Update the A record to point to the new host.

Switching email providers
Update MX records to point to the new email server.

Adding new services
Add records for new tools, subdomains, or services you're implementing.

Improving security
Add TXT records for email security (SPF, DKIM, DMARC).

Fixing problems
Remove stale records, fix incorrect configurations, or address security issues.

A good IT provider will explain these changes before making them, and confirm they worked correctly after.

What Can Go Wrong

Domain expires
If you don't renew your domain, DNS stops working. Your website disappears, email bounces, everything attached to that domain goes offline.

Unauthorized changes
Someone with access to your DNS makes changes without understanding the implications.

Deletion by mistake
Someone deletes a DNS record thinking it's unnecessary, breaking something that depended on it.

Hijacking
If your domain registrar account is compromised, attackers can change your DNS to point to their servers. Suddenly people trying to reach your website reach theirs instead.

This is why domain account security matters so much.

DNS and Email Security

Those TXT records in DNS? They're critical for email security.

Three records tell other email servers that email from your domain is legitimate:

SPF: Lists which servers can send email from your domain
DKIM: Cryptographically signs your emails
DMARC: Says what to do with emails that fail the above checks

Without these records in DNS, your legitimate emails might get marked as spam, and spammers can more easily impersonate your business.

Your IT provider should have configured these. But you can check: your DNS should include TXT records for email security. If they're missing, that's a gap that should be fixed.

Questions to Ask About Your DNS

You don't need to manage DNS yourself, but you should be able to get answers to these questions:

Where is our domain registered?
This is who controls your DNS.

Can I access that account?
You should have login credentials to your own domain.

What are our current DNS records?
Not every detail, but the important ones - where the website points, where email goes.

When was DNS last modified?
And what changed? Regular, documented changes are fine. Undocumented or unexplained changes are concerning.

What happens if our current DNS breaks?
Is there monitoring? A backup plan? Who would fix it?

The Verification You Can Do

You can check your own DNS without technical expertise. Tools like whatsmydns.net let you look up your domain and see where it's pointing.

You'll see records like:

A Record: Points to an IP address (where your website is)
MX Record: Points to an email server
TXT Records: Various text entries for verification and security

You don't need to understand every entry. But if something breaks, you can see what's currently configured and share that with whoever's fixing it.

The Bottom Line

DNS is your business's address book entry on the internet. It tells people where to find your website, where to deliver your email, and how to reach your services.

You don't need to manage DNS yourself. But you should:

Understand what it does
Know where your domain is registered and how to access it
Verify important records are correctly configured
Ensure changes are documented and explained
Keep your domain registrar account secure

When DNS works, it's invisible. When it breaks, everything breaks. Understanding the basics helps you ask the right questions and spot problems before they become crises.

Many owners only realize these gaps after something changes — a vendor leaves, a certificate expires, or an insurance renewal asks unexpected questions.

Explain My IT exists to create a dated, owner-readable record of what's visible from the outside — so you don't have to reconstruct this later.

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