This article explains the difference between a domain vs URL. They may look similar, but there are some differences. Basically, the domain name is a part of a URL.
A domain is the main part of a web address that identifies a website (like example.com). It’s the core name people use to find your site, independent of pages or sections.
A URL (Uniform Resource Locator) is the complete web address that directs to a specific location or resource on the internet. It includes the protocol (like https://), the domain, and often additional elements like a path (/about), query parameters (?id=123), or fragments (#section1).
In short, the domain is part of a URL, but a URL gives a complete path to a resource on a website.
Table of Contents
What is a domain name?
Firstly, a domain name (RFC 1035) is an internet resource name. It locates an organization or other entity on the Internet. In general, a domain name is an address via which internet users can access your website. The Domain names are assigned as per the rules and procedures of the Domain Name System (DNS protocol). Any publicly-accessible name in the DNS is a domain name.
To access any web-based service, a user needs to use a valid domain name.
Examples of domain names: copahost.com, google.com, yahoo.com
What is a URL?
URL stands for Uniform Resource Locator. It was first defined in RFC 1738 in 1994 and is now governed by RFC 3986, which superseded it in 2005. It is a unique identifier that is used for locating the files on the internet. It’s a web address, that we use to identify a specific resource on the network.
For example, in the URL: http://blog.example.com:80/about?id=123#
There elements of a URL:
- Protocol: Specifies how data is transferred (e.g.,
http://orhttps://). - Domain name: The website’s main address, like
example.com. - Subdomain (optional): Appears before the domain, such as
blog.inblog.example.com. - Port (optional): Used for network services, often omitted (e.g.,
:80for HTTP). - Path: Directs to specific pages or directories, like
/about. - Query parameters (optional): Provide extra data to the server, starting with
?, as in?id=123. - Fragment (optional): Links to a section on the page, starting with
#.
This image shows the elements of a basic URL
Examples of URLs:
https://www.copahost.com/blog/domain-vs-url/https://example.comhttps://shop.example.com/products/shoes?colour=blackhttps://docs.example.com/guide#installation
Only two of those elements are mandatory: the protocol and the domain. Everything else — subdomain, port, path, query parameters, fragment — is optional, which is why https://example.com is a complete and valid URL on its own.
URL and domain examples, broken down
The same rules applied to five real addresses:
| Full URL | The domain | What else is there |
|---|---|---|
https://copahost.com | copahost.com | Nothing — protocol and domain only |
https://www.copahost.com/blog/ | copahost.com | www subdomain, /blog/ path |
https://blog.example.co.uk/post-1 | example.co.uk | blog subdomain, /post-1 path |
https://shop.example.com/item?id=42 | example.com | shop subdomain, path, ?id=42 query |
https://docs.example.com/guide#install | example.com | docs subdomain, path, #install fragment |
Two things to notice.
The domain is always the same two-part unit — name plus extension — regardless of how much is wrapped around it. In blog.example.co.uk the domain is example.co.uk, because .co.uk is a two-level extension.
And the first row is a complete, valid URL. No subdomain, no path, no query. That’s the minimum a URL can be: a protocol and a domain.
Domain vs URL: the differences
| Domain | URL | |
|---|---|---|
| What it is | The name of the site | The address of one specific resource |
| Example | example.com | https://example.com/blog/post?id=1 |
| Contains the other? | No — it’s a component of the URL | Yes — every URL contains a domain |
| How many | One per site | As many as the site has pages |
| You obtain it by | Registering it with a registrar | Creating a page — it comes from your site’s structure |
| Changing it | Expensive — it’s your identity | Straightforward, but needs a 301 redirect |
| Minimum form | example.com | https://example.com |
The short version: a domain identifies the site, a URL identifies something inside it. In https://example.com/blog?id=123, the domain is example.com and everything around it narrows the address down to one specific resource.
What is a subdomain?
A subdomain is a prefix added to a domain, creating a separate address within it. In blog.example.com, the subdomain is blog — the part before the main domain.
example.com— the domainbloginblog.example.com— a subdomainshopinshop.example.com— another subdomain
Two things are worth getting right here, because they’re commonly confused.
The full string blog.example.com is a hostname, not a subdomain. The subdomain is only the prefix; the hostname is the whole name that resolves to a server.
And www is a subdomain like any other. www.example.com and example.com are technically two different hostnames, which is why sites configure one to redirect to the other rather than serving both.
Subdomains are free — you create as many as you want within a domain you already own — and each can point to a completely different server.
Domain extensions and countries
The last part of a domain — .com, .br, .org — is the top-level domain, or TLD. There are two broad kinds.
Generic TLDs aren’t tied to any country: .com, .net, .org, .info, and the hundreds of newer ones like .blog and .shop.
Country-code TLDs are two letters assigned to a territory, each administered by an organisation in that country. Registration rules vary — some are open to anyone, others require a local presence or a national tax ID.
- Brazil – .br
- Italy – .it
- Portugal – .pt
- Mexico – .mx
- China – .cn
- Russia – .ru
- India – .in
One point relevant to this comparison: only the domain carries any country association. A URL doesn’t. The path, the parameters and the protocol are identical everywhere in the world. Our guide on domain extensions covers how to choose one.
How to check who owns a domain
Since a domain is registered rather than bought outright, there’s a public record of who holds it — and looking it up takes seconds.
A WHOIS lookup returns the registration data: the registrar, the creation and expiry dates, the nameservers, and — sometimes — the registrant’s name and contact details. You can run one from the domain search on our homepage, or from the command line:
whois example.com
What you’ll usually see instead of a name: most registrars now enable privacy protection by default, replacing the owner’s details with the registrar’s own. That’s a consequence of GDPR and of registrars competing on privacy, and it means WHOIS today tells you where a domain is registered far more reliably than who registered it.
What remains visible and useful:
The registrar — which company holds it, if you want to make an offer or file a complaint.
The dates — creation tells you how old the domain is; expiry tells you when it might become available.
The nameservers — which usually reveal who hosts the site, even when the owner is hidden.
The status — codes like clientTransferProhibited show whether the domain is locked.
For country extensions the rules differ. Brazil’s .br registry publishes the holder’s name and CNPJ by regulation, with no privacy option. Several European ccTLDs do the opposite and hide everything.
If the owner is hidden and you want to buy the domain, most registrars provide a contact form that forwards to the owner without revealing their address — and marketplaces like Sedo and Afternic list domains whose owners are open to selling.
What are the differences between HTTP and HTTPS in the URL
Hyper Text Transfer Protocol (HTTP) is a protocol. In other words, it’s a set of rules and standards.
Moreover, the hyper-text exchanged using HTTP goes as plain text. Thus, this protocol is not secure and is susceptible to interception. Whereas, on the other hand, HTTPS is a secure protocol. It works in conjunction with a TLS/SSL (Secure Socket Layer) certificate. The certificate, then, is to ensure the authentication of the flow of information between the browser and the server. This other article, HTTP vs HTTPS explain in detail this difference inside the URL.
DNS and URL
How does the DNS server work in case of a specific URL? The domain name is responsible for the DNS resolving. First of all, as we request a specific URL from a server, the local DNS resolver of our provider will find its domain name. Then, if there is a subdomain, it will ask for the IP address of it. Then, having the IP address, our browser will connect to the web server and ask for the content inside the path of it.
Let’s exemplify step by step how the DNS works with a URL:
- Firstly, we will try to access this URL: https://login.bikestore.com/internal/file.html
- Then, the DNS resolver queries the domain name bikestore.com for the IP address of the subdomain login.bikestore.com
- Now, having its IP address, it will establish a connection with the webserver.
- And finally, being connected to the web server, it will ask for the contents of the URL path and file /internal/file.html
Frequently asked questions
What is the difference between a domain and a URL?
The domain is the name that identifies a website, like example.com. The URL is the complete address of a specific page within it, like https://example.com/blog/post. The domain is one component of the URL — every URL contains a domain, but a domain on its own isn’t a URL.
Is www.example.com a domain or a URL?
Neither, strictly. It’s a hostname — the domain example.com with the subdomain www. It becomes a URL when a protocol is added: https://www.example.com. Browsers hide this by adding https:// automatically, which is why the distinction is easy to miss.
What are the parts of a URL?
Protocol (https://), optional subdomain (blog.), domain (example.com), optional port (:443), optional path (/articles), optional query parameters (?id=123) and optional fragment (#section). Only the protocol and the domain are required.
Can a domain have more than one URL?
Yes, and almost every domain does. A single domain hosts as many URLs as it has pages, and each path, parameter and fragment produces a distinct one. A site with a thousand articles has at least a thousand URLs on one domain.
Where does the domain end in a URL?
At the extension. In https://shop.example.com/item?id=42, the domain is example.com — everything before it is a subdomain, everything after is path and parameters. The exception is two-level extensions: in blog.example.co.uk the domain is example.co.uk, because .co.uk counts as one extension.
Is a subdomain part of the domain or the URL?
Both, depending on how you look at it. The subdomain belongs to the domain you own — you create it yourself, at no cost. And it appears within the URL, between the protocol and the main domain.
How do I find out who owns a domain?
Run a WHOIS lookup, either through a web tool or with whois example.com from the command line. It returns the registrar, the creation and expiry dates, and the nameservers. The owner’s name is usually hidden behind privacy protection, so WHOIS tells you where a domain is registered far more reliably than who registered it.
Does the URL affect SEO?
Yes, though less than people assume. Short, readable URLs that describe the page help both users and search engines, and keeping a URL stable matters more than its wording — changing one without a 301 redirect loses whatever ranking it had. The domain has its own influence, mainly through age and authority rather than the words in it.
Can I change a URL without losing traffic?
Only with a 301 redirect from the old address to the new one. Without it, the old URL returns a 404 and everything that page had accumulated — its position, the links pointing to it — is lost. This is the single most common way sites lose traffic they had already earned.
What’s the difference between a URL and a URI?
A URI (Uniform Resource Identifier) is the broader category: any string that identifies a resource. A URL is a URI that also says where to find it and how to reach it. In everyday use the two are treated as synonyms, and the distinction only matters in specifications.
Why do some URLs have a question mark and numbers?
Those are query parameters, and they pass data to the server. In ?id=123&sort=price, the page is receiving an ID and a sort order. They’re common on search results, filtered listings and tracking links — and because different parameters can return the same content, they’re a frequent source of duplicate-content issues in SEO.
Does a URL need www?
No. www is a subdomain like any other, and a site works identically with or without it. What matters is picking one and redirecting the other, so the same content isn’t served at two addresses — which would make search engines choose between them.
Register a domain with Copahost and you get more than the name: unlimited subdomains, a free SSL certificate so every URL runs on HTTPS, and mailboxes at the same domain. Hosting and domain in one panel, with free migration if your site is already somewhere else.
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The distinction comes down to scope. The domain is the name of a place; the URL is the address of something inside it. example.com tells you which site; https://example.com/blog/post tells you which page, over which protocol, on which subdomain.
Two things are worth carrying away. A domain on its own isn’t a URL — www.example.com is a hostname, and it only becomes a URL when a protocol is attached, which browsers do silently. And only the protocol and the domain are required: everything else in a URL, from the subdomain to the fragment, is optional, which is why addresses vary so much in length.
The practical consequence is where each one lives. You register the domain once, and it’s yours for as long as you renew it. The URLs are created by your site’s structure — and unlike the domain, they can be changed, which is exactly why changing one without a redirect is the most common way to lose traffic you’d already earned.
