DNS
Quick Definition
DNS (Domain Name System) translates human-readable domain names like zerotowp.com into IP addresses that computers use to find each other. It is the internet's phone book.
What Is DNS?
DNS (Domain Name System) is a hierarchical, decentralized naming system that translates human-friendly domain names into numeric IP addresses. According to MDN Web Docs, DNS maintains a list of domain names along with the resources (such as IP addresses) associated with them.
Without DNS, you'd have to type 192.0.2.172 into your browser instead of zerotowp.com. DNS is essentially the internet's phone book — you look up a name and get an address.
When someone visits your WordPress site, here's what happens in milliseconds:
- Browser asks a DNS resolver: "What's the IP address for zerotowp.com?"
- The resolver checks its cache, or queries DNS servers up the hierarchy
- A response comes back: "It's 76.76.21.21" (for example)
- The browser connects to that IP address and loads your site
DNS in Practice
You manage DNS records through your domain registrar (where you bought your domain) or a DNS provider like Cloudflare. The most common DNS record types for WordPress sites:
- A Record — points your domain to an IP address (e.g.,
zerotowp.com → 76.76.21.21) - CNAME Record — points one domain to another (e.g.,
www.zerotowp.com → zerotowp.com) - MX Record — directs email to your mail server (needed for custom email like
you@yourdomain.com) - TXT Record — stores text data, often for verification (Google Search Console, SPF for email authentication)
- NS Record — specifies which nameservers are authoritative for your domain
DNS propagation: When you change DNS records (like switching hosts), the changes don't happen instantly. It typically takes 24-48 hours for changes to propagate across all DNS servers worldwide — though in practice, most changes take effect within a few hours.
Pro tip: Before migrating your WordPress site to a new host, lower your DNS TTL (Time to Live) to 300 seconds a day in advance. This makes the switch much faster.
Why It Matters
You interact with DNS every time you connect a domain to hosting, set up a CDN like Cloudflare, configure email, or migrate to a new host. Understanding the basics prevents costly mistakes like email downtime after a migration. See our domain name guide and Cloudflare setup guide for practical DNS tasks.