Important part of a web design Sydney is selecting domain names. For Sydney it is usually http://www.yourcompanynamehere.com.au/. There are other extensions that may suit you. They are .org, .edu, .asn, .gov, .info. .biz, .net. If you want to have a website registered as .com.au, then it has to be attached to some company. Before registering your domain name, always remember to check if there is a chance of any trademark infringement.