A domain name space refers to the letters at the end of a website or email address. For example www.domainoz.com.au, www.domainoz.com.au, or www.domainoz.co.uk.

There are different domain spaces for different countries, regions, and interest groups. Below are some popular ones:

.com
.com domain names were originally intended for businesses and commercial organizations. .com domain names are very popular for businesses and individuals.
.net
.net domain names were originally intended for network infrastructure providers and IT businesses. .net domain names can be registered by anyone.
.org
.org domain names are popular for no profit organizations or political groups.
.biz
.biz domain names are intended for small business websites.
.info
.info domain names are intended for information resource websites.
.us
.us is the United States of America country code. .us domain names can be registered by anyone with a local presence in the USA.
.com.au
A .com.au domain name is a must-have if you’re doing business in Australia. .com.au domain names can be registered by Australian registered businesses
.net.au
.net.au domain names were originally intended for Australian network infrastructure providers and IT businesses. .net.au domain names may be registered by Australian registered businesses.
.org.au
.org.au domain names are used by Australian non-commercial organizations. An .org.au Domain Name can only be registered by Australian non-commercial organisations.
.id.au
.id.au domain names are intended for Australian individuals. It’s a great way to make it easy for your friends and family to find you.
.asn.au
.asn.au domain names are intended for Australian associations
.at
.at is the country code / domain space for Austria. An .at domain name can be registered by anyone
.be
.be is the domain space for Belgian. A .be domain name can be registered by anyone
.ca
.ca is the Canadian country code .A ca domain name can be registered by Canadian residents, or the owners of a registered Canadian trademark
.cn
.cn is the country code for China
.com.cn
.com.cn is the country code for China. A .com.cn domain name is intended to be used by businesses and commercial organisations. There are no policy restrictions for .com.cn domain names
.cc
.cc is the country code for the Cocos Islands. A .cc domain name can be registered by anyone
.eu
.eu is the country code for the European Union. To register a .eu domain names you must be one of the following: undertakings having their registered office, central administration or principal place of business within the European Community; organisations established within the European Community without prejudice to the application of national law; natural persons resident within the European Community
.com.fj
.com.fj is the country code for Fiji. A .com.fj domain name is intended to be used by businesses and commercial organizations and can be registered by anyone
.de
.de is the country code for Germany. A .de domain name can be registered by anyone with a local contact in Germany
.com.hk
.com.hk is the country code for Hong Kong. A .com.hk domain name can be registered by anyone with a Business Registration Certificate from Inland Revenue Department of the Government of HKSAR or; a Certificate of Registration of Overseas Company from Companies Registry of the HKSAR
.hk
.hk is the country code for Hong Kong There are no policy restrictions for .hk domain names
.co.il
.co.il is the country code for Isreal. A co.il domain name is intended to be used by businesses and commercial organizations and can be registered by anyone
.it
.it is the country code for Italy. An .it domain name can be registered by companies registered with the European Union. A ‘Letter of Assumption of Responsibility (AR)’ on company letterhead must be supplied
.jp
.jp is the country code for Japan. A .jp domain name can be registered by anyone
.la
.la is the country code for Laos. .la domain names are also used to represent the city of Los Angeles. A .la domain name can be registered by anyone
.nl
.nl is the country code for The Netherlands. An .nl domain name can be registered by anyone with a local contact in The Netherlands. Terms and conditions must be agreed to via fax
.net.nz
.net.nz is the country code for New Zealand. .net.nz domain names are intended to be used by network infrastructure providers and IT businesses. A .net.nz domain name can be registered by anyone
.org.nz
.org.nz is the country code for New Zealand. .org.nz domain names are intended to be used by non-profit organisations. An .org.nz domain name can be registered by anyone
.com.ph
.com.ph is the country code for the Philippines. Com.ph domain names are intended to be used by businesses and commercial organizations. A .com.ph domain name can be registered by anyone
.ph
.ph is the country code for the Philippines. A .ph domain name can be registered by anyone
.com.ru
.com.ru is the country code for Russia. A .com.ru domain name is intended to be used by businesses and commercial organizations and can be registered by anyone
.com.sg
.com.sg is the country code for Singapore. A .com.sg domain name is intended to be used by businesses and commercial organizations and can be registered by anyone with a local contact in Singapore
.co.za
.co.za is the country code for South Africa. A .co.za domain names is intended to be used by businesses and commercial organizations and can be registered by anyone
.com.es
.com.es is the country code for Spain. Registrants of a com.es domain name may be required to sign an authorization form via fax
.ch
.ch is the country code for Switzerland. A .ch domain name can be registered by anyone
.com.tw
.com.tw is the country code for the Tawian. A .com.tw domain names is intended to be used by businesses and commercial organizations and can be registered by anyone
.to
.to is the country code for Tonga. A .to domain name is often used to make a fun domain name like cr.yp.to and can be registered by anyone
.tv
.tv is the country code for Tuvulu. .tv domain names are also popular for media, television, and multimedia websites
.co.uk
.co.uk is the country code for the United Kingdom. A .co.uk domain name is intended to be used by businesses and commercial organizations and can be registered by anyone
.ws
.ws is the country code for Western Samoa. .ws domain names are also used to indicate a website and can be registered by anyone