Not usually.
WikiAnswers made a corporate decision to disallow web addresses. These go in Related links.
Web addresses can be obtained by purchasing a web domain. Domain site will provide you with everything you need for your website for a cost to fit your budget to get you the website you need.
Austria is the country with .at web addresses. Australia, however, has .au addresses instead.
.us - Is an abbreviation for the United States in web addresses.
Hyperlink
Web addresses are case sensitive for Linux/UNIX based operating systems.
There are some sites online where you can check if a web address is already in use. If you are making a site with a free online host you can take a look which web addresses are still aviable.
Crawler
web addresses are not permitted here.
You are not allow to give out web addresses.
There is no one list of all web sites. However, dmoz.org categorizes many web sites by type.