What is FQDN? What does FQDN do? - ClouDNS Blog

Technological and software terminology is not very easy to understand, mainly if you belong to something other than the industry. Terms like FQDN and PQDN can go highway if you are a first-timer coming across these terms, as they are not really self-explanatory.

Though you might be familiar with domain name hosting, as you might come across them on a daily basis, a basic understanding of other terms like FQDN & PQDN is as essential.

In this article, we shall understand a fully qualified domain name vs a partially qualified domain name.

Further timely renewal of domain hosting helps you find cheap domain hosting options which help you keep your website running without any break.

What is FQDN & PQDN

A Fully Qualified Domain Name is a small part of a URL formed by domain levels and subdomains for resource location. It provides complete information to identify a website’s location, including the hostname, domain, and top-level domain (TLD).

A partially qualified domain name is a part of FQDN but comprises only the domain name of a website address without the hostname.

Difference Between- FQDN VS PQDN

  • Fully Qualified Domain Name

  • Structure: It consists of –
  • www. (Hostname):

The hostname is a tag given within a FQDN that aids in identifying a particular network resource. In simple language, it is a user-friendly name given to a server or a service.

  • Top-Level Domain: 

It is known to be the highest-level domain in FQDN, whose position is to the right-hand side of the dot. The significance of this domain is that it identifies the category of the website resource.

  • Subdomain: 

They are added on the left-hand side of the root domain, categorizing content services or resources under the main domain—for Instance, blog.xyz.com.

  1. Trailing Dot:  

The trailing dot is a starting point of the website address, which is situated at the end of the website name.

  • Function: FQDNs provide the full address of your website in the internet framework, i.e., the actual location within the Domain Name System (DNS).
  • Reliability: It is more reliable than an IP address because it defines the firm’s entire domain name hierarchy, reducing DNS name resolution issues.

2. Partial Qualified Domain Name


  • Structure: It includes only the domain and TLD, skipping the hostname—for example, mywebsite.com.
  • Function: PQDNs can be used to access a website, but they are shorter and only exhibit the company domain name.
  • Ease of Use: As compared to FQDN, they are easier to type, catchier, and more memorable with fewer characters.
  • Usage: PQDN is used when you don’t have to make use of complete FQDN, such as in specific programming or engineering scenarios.

3. Key Differences:

  • Length: FQDNs are longer as they include the hostname, while PQDNs are shorter, comprising only the domain and TLD.
  • When is it used?FQDNs are used for specifying the complete address and hierarchy within the DNS, reducing potential resolution issues. PQDNs are used when a shorter, more straightforward representation is sufficient.
  • Memorability: FQDNs are detailed but may be challenging to remember due to their length, whereas PQDNs are shorter, catchier, and more memorable.
  • Examples:
    • FQDN: www.mywebsite.com
    • PQDN: mywebsite.com


FQDN and PQDN are acronyms used when you use a domain name.

The best thing is that you don’t have to do anything special to get your FQDN or PQDN, as when you buy your web hosting inclusive of a domain, your web host will ensure both are set up.


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