What Is A Fully Qualified Domain Name (FQDN)?
A fully qualified domain name (FQDN) is the entire address of an internet domain. What makes a domain fully qualified is that it contains all of the three elements that are needed in a domain name. These elements include a hostname, domain name, and top-level domain.
In the following example, www.checkpoint.com, there’s:
- ‘www’ which is the hostname
- ‘checkpoint’ which is the domain name
- ‘.com’ which is the top-level domain
The top-level domain can vary, with everything from .net and .org to .biz and .edu all falling into this final category.
Essential Elements of FQDN
The three essential elements of a FQDN are as follows:
- Hostnames: While ‘www’ is the most common hostname, other internal hostnames like ‘mail,’ ‘api,’ ‘database,’ and many more all exist.
- Domain Name: The registered domain of the website is the name that people will type into their search bar to find a website.
- Top-Level Domain: A top-level domain is the final suffix that demonstrates what the domain name is attached to. Most businesses will buy as many suffixes as possible and then reroute all of those website FQDNs to their main .com business site.
Importance of FQDN
Fully qualified domain name technology is vital for internet security.
If a business didn’t have an FQDN, then there would be no way to ensure that a customer arrives on their web page when clicking on a link. By having an FQDN, businesses can always send customers to the right webpages.
To add an extra layer of security to websites, businesses can obtain SSL certificate validation.
(this ensures their sites stay encrypted and connections to their website remain secure.)
As no one can use a domain name that is already owned by someone else, the FQDN system is extremely effective at stopping fraudulent sites from existing. While some threat actors will create similar FQDNs that seem to resemble the original (‘youtbe’ instead of ‘youtube’ as the domain, for example), search engine rankability factors will make these harder to find.
Plus, many businesses will buy close replicas of their domain name to ensure that threat actors cannot create similar sites and use their similarity to help advance their nefarious plans.
Locating an FQDN Across Operating Systems
Different operating systems have distinct processes to locate fully qualified domain names.
But the vast majority of operating systems make finding an FQDN as easy as possible to help streamline network security. Here is how to locate a FQDN on different operating systems:
- Windows: Navigate to ‘System Settings,’ scroll to the ‘About’ tab, select this, and then your FQDN will be under ‘Device Name.’
- MacOS: Within a Mac computer’s system settings, navigate to /Preferences, then click on ‘Sharing,’ and you should see the FQDN under ‘Computer Name.’
- Linux: Locate an FQDN by navigating to the Linux terminal (CTRL+ALT+T) and typing in ‘hostname-fqdn.’
FQDN and Network Security
Fully qualified domain names allow for several security enhancements:
Simplified Split Tunneling
By using FQDNs, businesses can streamline split tunneling when using VPNs.
As VPNs are vital in modern business architecture, this can lower the latency of core business applications and contribute to more effective company systems. FQDNs provide a valuable alternative method of constructing split VPN tunnels, as domain names can cover several assets instead of the alternative of using multiple IP addresses.
Enhanced Security Controls:
Businesses can use fully qualified domain names to create more granular security rules in relation to their entire network ecosystem. For example, public-facing parts of your business could have vastly different rules in place compared to an internal part of your system.
Using FQDN allows for the flexibility to create more precise security controls.
Improved Identification:
At their core, fully qualified domain names are vital for network security, as their precision helps to guarantee that when a customer types in a certain FQDN, they will land on the intended webpage.
This certainty helps prevent users from accidentally entering websites that may contain malicious software.
Relationship Between FQDN, URLs, and Domain Terminology
FQDNs, URLs, and domain technology are all similar terms that all exist within internet navigation. However, there are some slight differences that are important to take note of.
While an FQDN has three core components, a URL will take these further by adding more information.
- A URL will include https:// (if the site uses https).
- It could also include more information after the top-level domain. For example, you may add /solutions within www.checkpoint.com to access the URL /solutions/.
Domain technology is a term that refers to the specific domain component of an FQDN.
With that in mind, domain technology is one unit, FQDN is three, and a URL is four or more. Understanding these differences is an important part of DNS security.
Leveraging FQDNs for Enhanced Network Security
A company’s domain is often the first introduction a customer has to its content, products, and assets. If a website is compromised or false domains fraudulently capture its customer leads, then the business gives potential customers a terrible first impression.
Enterprises looking to construct robust network security should strive to protect their domain and leverage FQDNs across their entire ecosystems. Check Point SASE offers FQDN Split Tunneling, allowing businesses to:
- Lower latency for sensitive applications
- Reduce the burden for IT teams that manage VPN split tunneling
- Improve performance
By using FQDN split tunneling, businesses can simplify the process of creating specific split tunneling rules by allowing entire FQDN addresses, instead of numerous unique IP addresses. This method effectively leverages FQDNs to enhance performance and fortify your network security defenses.
Alongside FQDN-based split tunneling options, businesses can also use Hybrid-Split Tunneling, which allows admins to create an automatic system that routes traffic through secure tunnels. This automated, smart split tunneling helps to further reduce latency and enhance the user experience while upholding security.
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