ReadyWebs DNS Explained: How Domain Names Connect to Websites
DNS Explained: How Domain Names Connect to Websites
DNS (Domain Name System) is the system that converts human-readable domain names like example.com into the numerical IP addresses that computers use to find each other on the internet. It is often called the phone book of the internet, and understanding the basics helps you manage your website more effectively.
How DNS Works
When you type a domain name into your browser, your computer does not actually know where that website lives. It needs to look up the IP address (a numerical address like 93.184.216.34) associated with that domain name. This lookup process is DNS in action.
Here is the simplified process: your browser asks your ISP’s DNS server for the IP address. If that server does not have it cached, it asks the root DNS servers, which point to the appropriate top-level domain (.com, .org, etc.) servers, which point to the domain’s authoritative nameservers, which finally return the IP address. Your browser then connects to that IP address and loads the website.
This entire process usually takes milliseconds, and the result is cached at multiple levels so future lookups are even faster.
DNS Records You Need to Know
DNS records are instructions that live on your domain’s authoritative nameservers. Different record types serve different purposes.
A Records point your domain to an IPv4 address. This is the most basic DNS record, telling the internet which server hosts your website.
AAAA Records are the same as A records but for IPv6 addresses.
CNAME Records point one domain name to another domain name. These are commonly used for subdomains. For example, you might have a CNAME record pointing blog.yourdomain.com to your blogging platform.
MX Records tell the internet where to deliver email for your domain. Without MX records, email sent to addresses at your domain would have nowhere to go.
TXT Records store text information and are used for various verification and security purposes. Common uses include email authentication (SPF, DKIM, DMARC) and domain ownership verification for services like Google Search Console.
Nameservers
Nameservers are the DNS servers that are authoritative for your domain. When you register a domain, you set its nameservers to point to whichever DNS provider manages your records.
If you use your hosting provider’s nameservers, they manage your DNS records through their control panel. If you use a third-party DNS provider like Cloudflare, you manage records through that provider’s dashboard.
Changing nameservers redirects all DNS queries for your domain to the new provider. This is how you move DNS management between providers.
DNS Propagation
When you make DNS changes, they do not take effect instantly worldwide. DNS servers at various levels cache records for a period defined by the TTL (Time to Live) value. Until cached records expire, some users might see old information while others see the new information.
DNS propagation typically takes 15 minutes to 48 hours, depending on the TTL values and the specific DNS servers involved. During this time, your website might intermittently resolve to old or new servers.
Key Takeaways
- DNS translates domain names into IP addresses that computers can use
- A records point domains to servers, MX records route email, CNAME records create aliases
- Nameservers determine which DNS provider is authoritative for your domain
- DNS changes can take up to 48 hours to propagate worldwide
- Understanding DNS basics helps you manage hosting migrations, email setup, and domain changes
This content is for informational purposes only and reflects independently researched guidance. Platform features and pricing change frequently — verify current details with providers.