DNS (the Domain Name System) is the internet’s phone book. When someone types your domain into their browser, DNS looks up which server your website actually lives on and sends the visitor there. You’ll probably never touch it, but the day you set up email or move hosting, knowing the basics will save you an afternoon of confusion.
The phone book, in four steps
Computers don’t find websites by name, they find them by IP address, a string of numbers like 197.242.10.5. DNS translates between the two:
- 1. Someone types yourbusiness.co.za into their browser.
- 2. The browser asks DNS: “what’s the address for this name?”
- 3. DNS answers with the IP address of the server where your site is hosted.
- 4. The browser connects to that server and loads your website.
All of this happens in milliseconds, invisibly, every time anyone visits any website.
Nameservers: who holds your phone book entry
When you register a domain, it gets pointed at a pair of nameservers, the servers that hold your DNS records. Usually these belong to your hosting company, which is why domain-and-hosting bundles “just work”: the registrar points the domain at the host’s nameservers and everything connects automatically.
Your DNS records then tell the world where each service lives:
- A record, where your website is (the IP address).
- MX records, where your email should be delivered.
- CNAME records, aliases, like making www.yourbusiness.co.za point to yourbusiness.co.za.
- TXT records, proof and permissions: verifying your domain with Google, or authorising email senders (SPF).
“Propagation”: why DNS changes aren’t instant
DNS answers get cached, remembered, by networks around the world so the system stays fast. When you change a record, the old cached answer takes time to expire everywhere. That’s propagation, and it’s why your host says changes can take up to 24–48 hours (most complete much sooner). It isn’t broken; it’s just the phone books updating.
When you’ll actually touch DNS
For most owners, exactly four occasions: connecting a domain to hosting for the first time, setting up professional email, verifying your site with a service like Google Search Console, or moving to a new hosting company. In every case it’s editing one or two records, and if your domain and hosting are with the same provider, support usually does it for you.
The best part of understanding DNS is realising you can register your domain today and point it wherever you like, whenever you’re ready:
