Beginner Guides8 min readMarch 24, 2026

What Is a Domain Name? Parts, Examples, Costs and How Registration Works

A turquoise wooden door beside two blue enamel house-number plates, 16 and 2, on a rough stone wall.

By Thomas Lovas Lokoy — researched and drafted with AI assistance from published sources; edited and published by NorwegianSpark SA · Editorial policy

Affiliate disclosure: Some links in this article are affiliate links. We may earn a commission if you make a purchase, at no extra cost to you. This helps fund our independent research.

A domain name is the human-readable address of a place on the internet: topdomainagent.com, wikipedia.org, bbc.co.uk. Computers find each other by numeric IP addresses; the Domain Name System (DNS) translates the name you type into the number the network needs. You do not buy a domain name outright. You register it, through a company called a registrar, for one to ten years at a time, and you keep the exclusive right to use it for as long as you keep renewing. At Porkbun on 16 October 2026 a .com cost USD 11.08 a year to register and the same to renew; a .online that cost USD 1.96 in its first year cost more than twice as much as the .com over five years once the renewals arrived. The worked example is below.

The parts of a domain name

Read a domain from right to left:

Part	Example: blog.topdomainagent.com	What it is
Top-level domain (TLD)	.com	The extension. Run by a registry (Verisign for .com) under contract with ICANN, or by a country's own registry for a two-letter code
Second-level domain	topdomainagent	The part you choose and register. Together with the TLD it is "the domain"
Subdomain / hostname	blog	Anything you create yourself in your DNS settings, free, without registering anything

So when you register a domain you register one combination, such as topdomainagent.com. The www in front of many addresses is just a hostname the owner created, exactly like blog or mail; it is not part of the registration and nobody registers it.

Two technical limits from the DNS standard (RFC 1035, section 2.3.4) are worth knowing because they occasionally bite: each label between the dots may be "63 octets or less", and a whole name may be "255 octets or less". In practice the limit you hit first is human: a name people cannot say or spell is the real failure, and how to choose a domain name covers that side.

Domain, URL, website, hosting: four different things

Domain name: the address (topdomainagent.com).
URL: a full address to one resource, including the protocol and path (https://topdomainagent.com/whois).
Website: the files and software that produce the pages.
Hosting: the server those files live on.

You can hold a domain with no website at all, and you can move a website between hosts without the domain changing. The domain is the one piece you own the rights to; everything else is replaceable. That is why the domain is the first thing to register and the last thing to let lapse.

Who runs the system

ICANN coordinates the root of the system and accredits registrars. It charges registrars a transaction fee of USD 0.20 for each year added by a registration, renewal or transfer, a rate its registrar-fee notice of 30 July 2026 keeps for fiscal year 2027, and many registrars pass it through as a visible line on your invoice.
Registries operate individual TLDs. Verisign runs .com and .net; country registries such as DENIC (.de) and Nominet (.uk) run their country codes; many newer extensions are run by commercial registries. The registry sets the wholesale price registrars pay. Verisign's .com wholesale price rises from USD 10.26 to USD 10.97 on 1 November 2026 (Domain Name Wire, 23 April 2026), and its 27 August 2026 SEC filing sets .net at USD 12.00 from 1 March 2027, up from USD 10.91.
Registrars sell registrations to the public and hold your account. Namecheap, Porkbun, Spaceship, Cloudflare Registrar, EuroDNS and Dynadot are all registrars. Different registrars charge different retail prices for the same domain, which is the entire reason to compare them.
You, the registrant, hold the right to use the name, the right to renew it, the right to move it to another registrar, and the right to sell it.

IANA's list of top-level domains (version 2026101600) held 1,437 entries on 16 October 2026, of which 248 were two-letter country codes. Only a few dozen of those matter for most people, and the domain extensions guide walks through them.

What registration actually gives you

Registration is a renewable lease, not a purchase, and it comes with obligations:

A term of 1 to 10 years. You can usually extend at any time up to the ten-year maximum. Renewing for several years before a known price rise locks in the old price for those years.
The exclusive right to the name for that term, and the right to renew before anyone else can take it.
Accurate contact details. Your registrar must verify your email address or phone number; under ICANN's 2013 Registrar Accreditation Agreement, if it gets no affirmative response "within fifteen (15) calendar days" it must "either verify the applicable contact information manually or suspend the registration". The verification email after you register is not optional.
Portability. You can move the domain to another registrar. Section 5.2 of ICANN's Transfer Policy requires your registrar to give you the "AuthInfo" code and remove the transfer lock "within five (5) calendar days" of your request if it does not let you do both yourself, and section 3.7 lets it deny a transfer requested within 60 days of the creation date or within 60 days of a previous transfer. The domain transfer guide covers the mechanics.
An expiry you have to manage. For generic extensions such as .com, ICANN's Expired Registration Recovery Policy requires reminders "approximately one month" and "approximately one week" before expiry, but a lapsed domain goes through a short recovery window and a 30-day redemption period and is then released for anyone to register. Domain renewal: how to never lose your domain is the short version; what WHOIS shows explains the status codes you will see along the way.

What a domain costs, with the numbers shown

Registrar retail prices differ, and the first-year price and the renewal price are often different numbers. Porkbun publishes its full price list at a public endpoint (its pricing API, the same data as its domain price page), which makes it the easiest registrar to quote honestly; every figure below was read from it on 16 October 2026, in USD per year.

Extension	Register	Renew	Five years held
.com	11.08	11.08	55.40
.net	12.52	12.52	62.60
.org	7.98	11.84	55.34
.co.uk	5.66	5.66	28.30
.de	2.90	4.07	19.18
.eu	5.88	5.88	29.40
.io	28.12	51.80	235.32
.co	15.76	31.20	140.56
.ai	82.70	82.70	413.50
.xyz	2.04	14.21	58.88
.online	1.96	28.84	117.32

The five-year column is arithmetic on that day's prices (first-year price plus four renewals), not a quote, and other registrars will differ in both directions. The point of the column is the comparison: a .online that looks like a USD 1.96 bargain costs more than twice as much as a .com over five years, and a .io costs more than four times as much. Always read the renewal price before the first-year price. Domain registration cost 2026 compares several registrars on exactly this basis, and the ICANN fee explained covers the USD 0.20 line some registrars add.

Names that are already registered and offered for resale are a different market altogether, priced by negotiation rather than by list; how domains are priced covers it.

Choosing one: the short version

Short enough to say in one breath and spell without being asked to repeat it.
No hyphens or digits, which have to be explained every time the name is spoken.
.com if a good one is available; your country code if you serve one country; a specialised extension only when your audience already expects it.
Check the trademark registers before you fall in love with a name.

Our domain name generator checks a keyword across several popular extensions in one pass, and the bulk search checks a whole list of candidates at once. The long version of the advice is how to choose a domain name: 12 rules.

After you register: the three things to set up

DNS. Point the domain at wherever your site lives, either by changing the nameservers to your host's or by adding A and CNAME records. How to set up DNS records is the step-by-step, and how to connect a domain to your website covers the common hosts.
Email. Add MX records for your mail provider, plus the SPF, DKIM and DMARC records that keep your mail out of spam folders. Business email on your own domain walks through it.
HTTPS. Most hosts issue a free certificate automatically; what an SSL certificate is explains what it does and when a paid one is worth it.

Then lock the domain against transfer, turn on auto-renew, and make sure the email address on the registrar account is one you will still be reading in nine years.

Where to register

Among the registrars we cover that include WHOIS privacy at no extra charge, Spaceship and Namecheap are the two we point beginners to first, and our registrar comparison puts their published prices next to the others. Whichever you choose, the step-by-step is how to register a domain name in five steps.

Frequently asked questions

What is a domain name, in one sentence?

A domain name is the readable address, such as example.com, that the Domain Name System translates into the numeric IP address computers use to reach a website or deliver email.

What is the difference between a domain name and a website?

The domain is the address; the website is the content and software that the address points to, stored on a host. You can register a domain with no website, and move a website between hosts without changing the domain.

Do you own a domain name after you register it?

No. You hold the exclusive right to use and renew it for the registered term, from one to ten years, and that right is yours to transfer or sell. If you stop renewing, the name eventually becomes available to anyone.

How much does a domain name cost per year?

At Porkbun on 16 October 2026 a .com cost USD 11.08 a year to register and to renew, a .co.uk USD 5.66, and a .io USD 28.12 in the first year and USD 51.80 to renew. Prices differ by registrar and change, so read the renewal price on the registrar's own page before you buy.

Is www part of the domain name?

No. www is a hostname the domain's owner creates in DNS, like blog or mail. You register example.com; www.example.com, blog.example.com and any other subdomain are yours to create for free afterwards.