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If there’s one thing the internet is known for, it’s constantly churning out an endless stream of acronyms that we all struggle to track. FQDN is yet another four-letter abbreviation to add to your repository of strange acronyms. But what does FQDN actually stand for? And when should you use one versus just a regular web address?

FQDN stands for “Fully Qualified Domain Name” and it is a web address that provides the complete and exact location for a website, server, or other web resource. 

Okay, so maybe words like domain name, server, and even website are new to you. But don’t worry.

In this article, we’re going to take a deep look at FQDNs. I’ll explain how they’re structured, exactly how they work, and provide some examples of when you would or wouldn’t need to use one. By the end, the world of FQDNs will make perfect sense.

What is a Fully Qualified Domain Name?

A fully qualified domain name (FQDN) is a complete domain name that shows the precise location of a computer, server, or host on the internet. 

FQDNs follow a specific format of hostname.main-domain.top-level domain with periods between each part. There’s also a trailing period at the very end.

Think of it like specifying the address for a particular apartment, instead of the street address for an apartment building. For example, the domain name for Google is google.com. But when you include a “doc” or “drive” prefix (making it drive.google.com), the FQDN precisely identifies their cloud storage website versus other parts of the google.com domain.

That’s like specifying apartment 105, 17 Domain Avenue, whereas google.com is the whole building. Meanwhile, you’ve got mail.google.com down the corridor in apartment 101 and one.google.com downstairs in apartment 99.

FQDNs help cut through ambiguity online, always refer to a single location in the domain name system, and ensure users end up where they intended. They’re especially critical for emails between companies or systems that share a common internet address.

FQDN Examples

Let’s take a few examples so you can get a better understanding of what an FQDN is. Remember that a fully qualified domain name has three elements – a hostname, the main domain name, and a top-level domain.

Here are a few practical examples of what I mean:

mymail.somecollege.edu: In this fully qualified domain name, the hostname is “mymail,” and it is located within the domain which is somecollege.edu. The top-level domain (TLD) is .edu.

imap.gmail.com: The hostname of this FQDN is “imap,” and it is located within the domain “gmail.com,” while the top-level domain is “.com.”

www.Atom.com: The hostname is “www”, and it is located in the domain “Atom.com,” while the top-level domain is .com

en.wikipedia.org:  The hostname is “en,” and it is located in “Wikipedia.org,” while the top-level domain (TLD) is “.org.”

How Do I find my FQDN?

So far we’ve talked about websites, which are online locations. FQDNs can also refer to specific computers connected to a network. Even your computer has an FQDN. Depending on the device you’re using, it’s easy to find your FQDN. If you use a Windows PC, follow these steps to get your FQDN.

• Launch the control panel (search for “control panel” in the startup menu or type Win+R).
• On the system information screen, you will see both the hostname and FQDN of your device.

        It’s easy. Right?

If you are using a Mac device, here’s how to find your FQDN:

• Click the System Preferences icon on the Apple menu. It is located at the top-left corner of your device’s screen.
• Select the System Preference option.
• Choose “sharing.”
• You will see your FQDN under the “computer name” section.

Why and When to Use an FQDN

At this point, I can picture you asking: “Why are FQDNs important?” After all, we get away with typing “Atom.com” into the browser bar, skipping the www required for an FQDN

FQDNs are important because they are completely unambiguous locations. When you skip www, your browser guesses that www is the hostname for the website. But you could never reach your Google Docs or Spanish Wikipedia without the FQDN.

So fully qualified domain names help connect domain services like email or file transfer protocol. For instance, if you were to connect your domain name’s email to Gmail or Apple Mail on your phone, then you need the FQDN of the mail server.

Some other areas where FQDNs are frequently used are:

Connecting to a remote host

An FQDN can be helpful in a scenario where you are trying to connect or reach a remote server that you don’t share the same internet service provider with.

Configuring the DNS and IP Address

IP addresses are long strings of numbers that computers use to navigate the internet. They’re matched to FQDNs, and wouldn’t you rather use “www.atom.com” than 194.148.1.48? So, whenever you want to configure your computer’s IP Address and DNS on the internet, you need your device’s FQDN.

Getting an SSL Certificate

These days, every website needs a secured socket layer (SSL) certificate to encrypt the connection between your browser and the web server. But you can’t use your SSL perfectly without an FQDN.

Search Engine Optimization

FQDN increases your website’s chances of ranking high on Search Engine Result Pages. Remember, the more your website ranks on search results, the more visitors it gets.

Migrating to a New Server

FQDN is also useful when you are migrating your website to a new server. Instead of using an IP address, an FQDN will propagate your DNS records faster and avoid any communication issues.

Wrapping Up

In conclusion, FQDNs play a crucial but often overlooked role in enabling the smooth functioning of the global internet. Their hierarchical naming structure of hostnames, domains, and top-level domains allows the immense complexity of worldwide networks to be untangled and organized in a way that ensures users reliably reach the intended online destinations. 

If you’re looking to establish your brand online, managing your domain names with FQDNs in mind can help make your site and services more discoverable. Check out our premium marketplace for domain names perfectly matched to your brand or project’s needs.

Frequently Asked Questions About FQDNs

What’s the Difference Between FQDN and URL?

Even though people use the terms interchangeably, FQDN and URL are two different entities. URL stands for “uniform resource locator” and includes all the information about a single web page, including the protocol (like HTTPS) and the file path. An FQDN is part of the URL that ultimately identifies the server to which a request is addressed.

What is a Partially Qualified Domain Name (PQDN)?

Unlike FQDN, PQDN (Partially Qualified Domain Name) only specifies part of the domain name. Usually, a PQDN misses out the hostname, so for instance, a PQDN is “Atom.com” instead of the FQDN: www.Atom.com.