Speaking of those purposes, one is noted that if you have a new web site or even an email account, your web hosting or the Internet Service Provider will ask you to change your registered Domain Name Server information in order to make your registered domain name to be connected to your web site and so your email account can be setup. Besides, it is found out that there are also some registrar companies who require a notarized form or other formal recognition documents, but these are just depending on the certain county that the registrants resides in. It is commonly noted that they require such documents for the domain name transfer process to prove that the registrant is the actual domain name holder. For that matter, the domain name extensions whether it is a dot com, dot net, or dot uk domain name, are then the top most part of the domain names under which all of the domain names are registered. Of course there are several types of domain names, and it is just interesting to know that each type of the domain name extension has its own functions and uses. Speaking of the top level domain name since this plays a large role in picking the right domain name for domain name registration; many experts have noted that before you go for a domain name registration, you should identify your top level domain. The .com is the most common top level domain that is used today, for it stands for commercial domains. So, for example, you want to locate the exact site for Passion Up, so then just enter it with the correct domain name which is passionup.com, or if you want to go for the FBI's web site, and then be aware that the domain name for them is fbi.gov. An exact and concrete awareness of the domain name is the best key for finding the desired site. The whois database maintained by the domain name registrars that list contact information about all the domain names issued by the registrar then serves as a major vehicle for knowing who owns domain names. And fortunately, this vehicle for determining who owns domain names is now available on the web and is open to be searched.