What is DNS?
What is DNS?
DNS stands for Domain Name System. It is often referred to as the “phone book of the internet” because it translates human-readable domain names (like example.com) into machine-readable IP addresses (like 93.184.216.34) that computers use to locate each other on the network.
Without DNS, you would need to memorize the numerical IP address of every website you wanted to visit.
How DNS Works
When you type a domain name into your browser, the following steps occur:
- DNS Query: Your browser asks a DNS resolver (usually provided by your internet service provider) to find the IP address for the domain.
- Root Server Lookup: If the resolver doesn’t have the answer cached, it queries a root nameserver, which directs it to the appropriate TLD nameserver (e.g., the
.comnameserver). - TLD Nameserver: The TLD nameserver points the resolver to the authoritative nameserver for the specific domain.
- Authoritative Nameserver: This server holds the actual DNS records for the domain and returns the correct IP address.
- Connection Established: Your browser uses the IP address to connect to the web server and load the website.
This entire lookup process typically takes just milliseconds.
Common DNS Record Types
| Record Type | Purpose |
|---|---|
| A Record | Maps a domain to an IPv4 address |
| AAAA Record | Maps a domain to an IPv6 address |
| CNAME Record | Creates an alias pointing one domain to another |
| MX Record | Directs email to the correct mail server |
| TXT Record | Stores text information, often used for verification and security (SPF, DKIM) |
| NS Record | Specifies the authoritative nameservers for a domain |
Why DNS Matters
- Ease of Use: DNS lets you use memorable names instead of numerical addresses.
- Email Delivery: MX records ensure emails reach the correct server.
- Website Availability: Properly configured DNS ensures visitors can find and access your website.
- Security: DNS-based security measures like DNSSEC help protect against spoofing and other attacks.
DNS and Your Hosting
When you register a domain and purchase hosting through 10Corp or any other provider, your domain’s DNS records need to point to the correct servers. This is typically done by setting your nameservers or configuring individual DNS records (A records, CNAME records, etc.) in your domain management panel.
Summary
DNS is the essential system that translates domain names into IP addresses, enabling browsers to load the websites you visit. Understanding DNS basics helps you manage your domain, troubleshoot connectivity issues, and keep your website running smoothly.