Domain name

A domain name is a special name. It helps us find things on the web.

Computers use long strings of numbers to talk. These numbers are hard to remember. Domain names use words instead. This makes them easy to learn.

Most names have parts. These parts are split by dots. The last part is the top level.

Some names end in .com or .org. Other names show a country. You can pick a name for a website. A person or company can own it.

These names help us find services. They help us find email too. They make the web easy to use.

A domain name is a text label for the Internet.

Computers use numbers to find each other. These are called IP addresses. Numbers are hard to remember. Domain names use words instead. This makes them easy to use.

Domain names follow a set of steps called the Domain Name System, or DNS. They are organized like a tree. The tree starts at a nameless root. From there, it grows into top-level domains, or TLDs. Some TLDs are for groups, like .com or .org. These are called generic TLDs. Other TLDs use two letters for a country.

Names have parts called labels. Dots separate these labels. The right-most label is the top level. Each label to the left is a subdomain. A subdomain is a smaller part of a larger domain. You can buy names from a registrar. This gives you the right to use them. You can use names for websites or email. You can even use them to find a specific computer. These computers are called hostnames.

A domain name is a text label used on the Internet.

Computers use numbers called IP addresses to find each other. These numbers can be very hard for people to remember. Domain names solve this problem by using easy words instead. A domain name can identify a whole network or just one computer. These computers are often called hostnames. Using names makes it much easier to reach websites or email services.

Domain names work through a system called the Domain Name System, or DNS. This system is organized like a tree with many branches. The tree starts at a nameless root at the very top. From the root, the first level of names is called a top-level domain, or TLD. Some TLDs are generic, like .com, .net, or .org. Others are country code TLDs that use two letters.

Below these are second-level and third-level domains. These are often the names people choose for their own websites.

In the early days of computer networks, things worked differently. People used a system called ARPANET before the modern Internet existed. Each computer had to get a file called host.txt from a computer at SRI. This file matched names to the correct numbers. As the network grew, this central list became too hard to manage. Because of this, the Domain Name System was introduced in 1983. It was published by the Internet Engineering Task Force.

Domain names are made of parts called labels. These labels are separated by dots. For example, in www.example.com, the right-most label is the TLD. The labels to the left are called subdomains. A fully qualified domain name, or FQDN, includes every label in the hierarchy. These names can be up to 253 characters long. Each individual label can be between 1 and 63 characters. Most people write domain names in lowercase letters.

Today, a group called ICANN manages the top levels of the Internet. They authorize registrars to sell names to the public. When you use a registrar, you get the right to use a name for a set time. This is not the same as legal ownership. Domain names help us connect to things we already know. You might see a name like books.com or travel.info. These names help people find specific types of services very quickly.

A domain name is a text-based string used to identify resources on the Internet. These resources include computers, networks, and various digital services like websites or email.

While computers communicate using numerical Internet Protocol (IP) addresses, these numbers are difficult for humans to memorize. Domain names provide an abstraction, replacing complex numbers with recognizable words. This system allows a resource to change its physical location or IP address without changing its name. This flexibility is essential for the modern, moving parts of the global network.

Domain names function through a hierarchical structure known as the Domain Name System (DNS). This system is organized like an inverted tree. At the very top is the DNS root domain, which is technically nameless. From this root, the hierarchy descends through various levels of subordinate labels. Each label is a part of the name separated by a dot. For example, in the name "www.example.com," the labels are "www," "example," and "com."

This structure allows for organized, scalable naming across the entire Internet.

The highest level of this hierarchy consists of top-level domains (TLDs). There are two primary types of TLDs. The first are generic top-level domains (gTLDs), which represent specific categories. Common examples include "com" for commercial use, "org" for organizations, and "edu" for education. The second type are country code top-level domains (ccTLDs). These use two-letter codes to represent specific territories.

Below these TLDs are second-level and third-level domains. These lower levels are often reserved by end-users through a domain name registrar. A domain name that includes every single label in the hierarchy is called a fully qualified domain name (FQDN).

Understanding the syntax of these names is important for technical accuracy. Each individual part of a domain name is called a label. A label can contain between 1 and 63 octets. The entire domain name cannot exceed a total length of 253 ASCII characters. While labels are case-insensitive, they are most commonly written in lowercase in technical contexts.

When a domain name is associated with at least one IP address, it is also referred to as a hostname. This term is often used to identify specific host computers on a network.

The history of domain names traces back to the ARPANET era. Before the modern Internet, researchers used a central file called "host.txt" to map names to numbers. This file was retrieved from a computer at SRI. However, as the network grew rapidly, a single central registry became impossible to maintain. To solve this, the Domain Name System was introduced in 1983. It was published by the Internet Engineering Task Force as RFC 882 and RFC 883. This change allowed the Internet to scale to its current massive size.

Today, the management of the domain name space is a highly organized global effort. The Internet Corporation for Assigned Names and Numbers (ICANN) manages the top-level architecture. ICANN authorizes registrars, which are the entities that sell domain names to the public. It is important to note that registering a name does not grant legal ownership. Instead, it grants an exclusive right to use that name for a specific duration.

In some cases, the use of domain names in commerce may be subject to trademark law.

Domain names have evolved significantly since the 1980s. Originally, there were only seven generic TLDs: "com," "net," "org," "edu," "gov," "mil," and "int." As the Internet expanded, the need for more names grew. In 2008, ICANN began a process to introduce many more generic TLDs. By 2016, the number of live gTLDs had reached 1,000. This expansion allows for much more specific naming, such as using brand names or industry terms. This continuous growth ensures that the naming system can keep up with new technologies and users.