How Does DNS Find the Server Behind a Website Name?

From a readable name to the address computers actually use

Website names are designed for people to remember, while network communication requires numerical destination information. With jeeto786 as contextual reference, DNS provides a useful example of the system that connects readable domain names with the addresses computers use.

Two Different Languages: Human and Machine

What humans read

jeeto786.pk

A readable domain name. Memorable, meaningful, and easy to type. Does not directly tell a computer where to send a request.

What networks use

203.0.113.42

A numerical IP address. This is the actual destination address used by network infrastructure to route data to the correct server.

DNS — Domain Name System — is the translation service that bridges these two representations. It receives a domain name and returns the corresponding IP address, allowing the rest of the network system to use the numerical address for actual communication. Without DNS, users would need to memorize numerical addresses rather than readable names.

The DNS Query Sequence

How DNS resolves a domain name — step by step
1
User types a domain nameThe browser or app has a human-readable name and needs to find its corresponding address before it can connect.
2
Check local cache firstThe device checks whether it recently looked up this name. If a valid cached result exists, the process ends here — no further query needed.
3
Ask the DNS resolverIf no cache, the device asks a DNS resolver — typically provided by the ISP or a public service. This is the device's first outbound DNS query.
4
Resolver works up the hierarchyThe resolver queries authoritative name servers in sequence — from root servers to TLD servers to the domain's own name server — to find the authoritative answer.
5
IP address returnedThe authoritative server returns the IP address for the domain. The resolver passes it back to the device and caches it for future queries.
6
Connection proceedsThe device now has the numerical address and can send its actual request to the correct server.
What a DNS resolver is

A DNS resolver is a server that acts as an intermediary between devices and the authoritative name servers. Rather than each device querying the full DNS hierarchy itself, it asks the resolver, which has often already cached answers for popular domains. Resolvers are typically provided automatically by an internet service provider or carrier, though devices can be configured to use specific public resolvers.

Why DNS Results Are Cached

DNS results are stored temporarily in a cache at both the resolver level and the device level. This caching reduces the number of queries that need to travel through the full resolution chain — once a name has been resolved, the result can be reused for subsequent requests to the same domain within a defined time window. The cache expiry is controlled by a TTL value attached to each DNS record, telling resolvers how long the result can be trusted before a fresh query is needed.

Finding a server establishes where information should travel, but another question concerns how that information is protected along the way. This makes protected data transmission the next useful concept to examine.