A web domain is the unique name that identifies a resource on the Internet, such as a website or a service, and that users type into the browser to reach it. In technical terms, a domain represents one level of hierarchy in the Domain Name System (DNS), the distributed system that translates human-readable names into numeric IP addresses that machines can understand.
A domain is made up of several parts separated by dots: the rightmost level is the top-level domain, such as “.com” or “.org”, followed by the second-level domain chosen by the user, such as “example”. The full combination, for example “example.com”, is the domain name you can register and use to publish content online.
How DNS translates a domain into an IP address
DNS works like a large address book distributed across thousands of servers around the world. When a user enters a domain in the browser, the device queries a series of DNS servers to get the IP address associated with that name. This process takes a few milliseconds and lets people browse without knowing the numeric addresses.
Domain management is handled by international organizations such as ICANN, which coordinates the assignment of top-level domains and sets the global rules. National registries, such as the .it Registry in Italy, administer the domains within their territory and set specific registration requirements.
Structure and levels of a domain
Every domain is organized in a hierarchy of levels that defines its function and priority in DNS resolution. Understanding this structure is essential to choose an effective name and to configure the associated services correctly.
Top-level domain
The top-level domain, or TLD, is the last part of the name and can be generic, such as “.com”, “.org” or “.net”, or national, such as “.it”, “.fr” or “.de”. Generic TLDs are not tied to a specific geographic area, while national ones identify a country or a territory.
Second-level domain
The second-level domain is the part chosen by the user or the organization, such as “example” in “example.com”. It must be unique within the reference TLD and is registered through an accredited registrar. Choosing a good second-level domain affects how recognizable your brand is and how easy the site is to remember.
Subdomain
A subdomain is an extension of the main domain that lets you organize different services under the same name. For example, “blog.example.com” or “shop.example.com” are subdomains of “example.com”. Subdomains do not require a separate registration and are configured by the owner of the main domain.
Domain, hosting and website: who does what
People often confuse domain, hosting and website, but they are distinct elements that work together to make a site accessible online. The domain is the address, the hosting is the space where the files live, and the website is the set of content and pages that users see.
| Element | Function | Example | Managed by |
|---|---|---|---|
| Domain | Identifies the site’s address | example.com | Accredited registrar |
| Hosting | Hosts files and databases | Web server | Hosting provider |
| Website | Content displayed to the user | HTML pages | Site owner |
| DNS | Translates the domain into an IP address | A record, CNAME | Registry or DNS provider |
| SSL certificate | Ensures an encrypted connection | HTTPS | Certificate authority |
Registration through a registrar and configuring DNS records
A domain is registered through registrars accredited by ICANN or by the competent national registry. The process requires choosing an available name, checking the requirements and paying an annual or multi-year fee. Once registered, the domain can be configured with DNS records to point to a hosting service, a mail service or other resources.
- Check the availability of the desired name through a registrar’s site or the competent registry.
- Check the specific requirements of the chosen TLD, such as residency or a VAT number for some national domains.
- Choose an accredited registrar and complete the registration procedure by providing the required data.
- Configure the DNS records to connect the domain to the hosting service or other services.
- Enable automatic renewal to avoid expiry and losing the domain.
- Protect the domain with transfer lock and two-factor authentication on the registrar account.
- Periodically update the owner’s contact details, as required by ICANN policies.
- Monitor the status of the domain and DNS configurations to ensure service continuity.
Frequently asked questions about web domains
What exactly is a web domain?
A web domain is a unique name that identifies a resource on the Internet and is translated into an IP address by the DNS system. It makes sites accessible through easy-to-remember names instead of numeric sequences.
What is the difference between a domain and hosting?
The domain is the address users reach the site through, while hosting is the server space where the site’s files live. They are two distinct services that can be provided by different companies.
How much does it cost to register a domain?
The cost varies depending on the chosen TLD and the registrar, and generally ranges from a few dollars to a few dozen dollars per year. Some premium or highly sought-after domains can have much higher prices.
Can I lose my domain?
Yes, if it is not renewed within the required terms, the domain can expire and become available to others. To avoid this, it is advisable to enable automatic renewal and keep your contact details up to date.
What are top-level domains?
Top-level domains, or TLDs, are the final extensions of a domain name, such as “.com”, “.org” or “.net”. They can be generic, national or sponsored, and are managed by organizations designated at the international level.
Can a domain be transferred to another owner?
Yes, a domain can be transferred to another registrar or to a new owner following the required procedures. The transfer requires the authorization of the current holder and compliance with the policies of the competent registry.
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Related entries:
Main domain TLD Top-level domain Second-level domain Domain name