Third-level domains
Third-level Internet domain names are created by those that own second-level domains. Third-level domains can be used to set up individual domains for specific purposes, such as a domain for web access and one for mail, or a separate site for a special purpose:- www.ukfast.net
- mail.ukfast.net
- servers.ukfast.net
Fourth-level and even higher Internet domains like "www2.un.news.media.twenty.net" can be also be established. Three of four levels is usually sufficient for most purposes.
Country domains
Each country in the world has its own top-level Internet domain with a unique alphabetic designation. A few countries and example domains are shown below.
| Top-Level Domain | Country | Example site |
| .ae | United Arab Emirates | http://www.uae.org.ae/ |
| .at | Austria | http://www.austria.at/ |
| .au | Australia | http://www.australia.com.au/ |
| .bb | Barbados | http://www.barbados.gov.bb/ |
| .bm | Bermuda | http://www.bermuda.bm/ |
| .br | Brazil | http://home.brazil.com.br/ |
| .ca | Canada | http://www.canada.ca/ |
| .ch | Switzerland | http://www.switzerland.ch |
| .cl | Chile | http://www.chile.cl/ |
| .us | United States | http://www.states.us/ |
Organisations in each country are responsible for managing the top-level Internet domain, and then for allocating second-level domains within that domain to people and organisations with interests in that country.
The Country Code Domain Name Supporting Organisation (CCNSO) is a support organisation of ICANN responsible for developing consensus positions and recommending global policies relating to country-code top-level domains.
If you have any questions about DNS then visit our DNS FAQ section for more help.
