Domain Name Server (DNS)


A Domain Name Server (DNS) is a fundamental component of the internet, acting like a distributed phonebook. It's responsible for translating human-readable domain names (e.g., into the numerical IP addresses (e.g., that computers use to communicate with each other.

How DNS Works

When you type a domain name into your web browser, a DNS resolution process occurs behind the scenes:

  1. Local Cache Check: Your device checks its local cache for the IP address.
  2. DNS Resolver: If not found locally, your device contacts a DNS resolver, typically provided by your Internet Service Provider (ISP).
  3. Root Servers: The resolver starts by querying root DNS servers to determine the authoritative nameserver for the top-level domain (.com, .org, etc.).
  4. TLD Nameservers: The resolver is directed to nameservers responsible for the specific top-level domain.
  5. Authoritative Nameservers: The resolver gets the actual IP address from the authoritative nameservers for that domain.
  6. Response and Caching: The IP address is returned to your device, and your browser connects to the website. The result is cached locally for faster lookup in the future.

Benefits of DNS