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What Is A Domain Name - Definition And Types

A domain name is a sequence of letters and or numbers separated by one or more periods (".") that act as a pointer to a unique numerical address (IP) on a computer network such as the Internet. That address may host publicly available content, or may be a private intranet.

A domain name always ends with an extension of 2 or 3 characters. These characters can signify the country the website address is associated with or the type of organization; but not always - more on that below.

Domain names operate under the Domain Name System (DNS), which is essentially the address book of the Internet. 

What are the different types of domain names?

Thankfully, you don't need to memorise all of the below. As a registrant; usually all you need to be able to distinguish between is a domain name - the popular terms used collectively for second and third level domains - and a subdomain.

TLD - Top Level Domains

These are at the highest level in the DNS structure of the Internet. There are several different types of TLD's, being:

ccTLD - country code Top Level Domains

Two letter domains established for geographical locations; for example; .au signifies Australia. When originally designated, usually only residents of a country could register their corresponding ccTLD; but over the years quite a few countries have allowed parties outside their shores to register website names. An example of this is Tuvalu (.tv). 

In the case of au domain names, registrants must still be Australians or have registered business interests in Australia. The strict registration eligibility criteria for au names has meant .au is still strongly associated with Australia and has promoted a great deal of trust and confidence in local online shoppers.

gTLD - generic Top Level Domain

The best known generic TLD's include .com, .net, .biz, .org and .info - these can be registered by anyone. However, some of the new gTLD's more recently released have various restrictions.

IDN ccTLD - internationalised country code top-level domains

A top-level name with a specially encoded format that allows it to be displayed in a non-Latin character set.

Below the TLD's are various other levels:

Second level 

Directly below a TLD in the DNS hierarchy, e.g.

Third level 

Directly below a second level in the DNS hierarchy. e.g.

The difference between second and third level can be a little confusing. For example, is considered a second level domain, but would be classed as a third level.


Part of a higher ranked domain name in DNS hierarchy; e.g.

Some services offer subdomain "registration" - but this usually isn't ideal for businesses and should probably be avoided.

As mentioned, knowing the differences of all of the above really isn't all that important - but something you will need to know is how to register a domain name. It's also a good idea to pick up some tips on choosing domains before you start your search and registration process.

Available Domain Name Search & Register


How to register a name: Enter your choice in the search tool and click 'GO'. If after the check the domain names search results show your choice is available, you will then have the option to proceed to purchase registration; which is a very quick and easy process - start a search and find your ideal website address now.