Domain-name basics
What is a domain name? Parts, DNS and registration
Reviewed 10 September 2026 · 6-minute read
A domain name is a sequence of DNS labels that identifies a place in the Domain Name System. In www.example.com, com is the top-level domain, example is registered beneath it in the common `.com` case, and www is a subdomain label. The name can point to web, email or other services.
Read a domain from right to left
DNS is hierarchical. The implicit root is at the far right, followed by the top-level domain and then subordinate labels. A trailing dot—www.example.com.—shows the fully qualified form, though browsers normally omit it.
| Part | Example | Role |
|---|---|---|
| Root | final implicit . | Top of the DNS hierarchy |
| Top-level domain | com | Delegated in the IANA root zone to a TLD manager |
| Registered label | example | Registered under the applicable registry policy |
| Subdomain/host label | www | Created beneath the registered domain by its DNS operator |
Registrable domain is a policy concept
Not every domain is registered directly one label below the TLD. For example, policies can permit registrations beneath structures such as co.uk. Applications that need the registrable boundary normally rely on a maintained public-suffix data set rather than assuming “last two labels.” SeekDom is intended for the complete domain a user may register, not arbitrary hostnames.
A domain name is not a URL
example.com is a domain name. https://example.com/docs?id=7#start is a URL containing a scheme, hostname, path, query and fragment. DNS helps resolve the hostname; HTTP handles the web request. See the domain vs URL guide for the full breakdown.
Internationalized domain names
People can enter Unicode domain labels, while DNS-compatible processing uses an ASCII representation called an A-label. SeekDom converts internationalized input to that IDNA form before checking label syntax and querying registration services. Visually similar characters can create spoofing risk, so review the exact Unicode and ASCII spelling before registration.
What registration gives you
A registration generally gives the registrant a time-limited right to control DNS for the name under registry, registrar and dispute policies. It is not perpetual ownership, a trademark grant, a hosting service or proof that a site is trustworthy. Renewal and accurate account contact details matter.
Frequently asked questions
What is an example of a domain name?
In example.com, com is the top-level domain and example is the label registered beneath it. A hostname such as www.example.com adds a subordinate label.
Is a domain name the same as a website?
No. A domain is a name in DNS. A website is content served over HTTP or HTTPS at a hostname. A registered domain can have no website, and one website can answer on several domains.
Do you own a domain name forever?
No. Registration creates a time-limited contractual right under registry and registrar terms. It must be renewed and can be affected by disputes, policy, transfer and expiry rules.