Secondly, the ICANN is responsible of accrediting the domain name registrars. Generally, the ICANN has particular criteria for the domain name registrars' accreditation. It is commonly noted that once the domain name registrars are accredited, it is then a duty of the domain name registrars to sign a contract and agree to bear by the ICANN's guidelines and procedures. Aside from that, it is also interesting to know that speaking of the domain name IP addresses; others noted that the domain name IP addresses are like the reference numbers that are applied to categorize the books in a library. As the library codes apply for you to know the title of a book to find in the library, the domain name IP addresses also function somewhat that way. With their domain name lookup service, they will automatically track the appropriate "whois" database server for a certain domain name, and then questions that database for details about that certain domain name. Also, they return all the available data after such process of locating the domain names. For much emphasis, in the last few years, another set of domain name suffixes are approved and these include the .aero for the air transport industry; .biz for reserved businesses; .com for businesses, commercial enterprises, or online services; .coop which is reserved for cooperatives; .edu for educational institutions and universities; . In this case, the WHOIS contact information such as the name, address, telephone numbers, and others will be deleted and the domain name will still be inactive. Accordingly, the domain can be renewed during this time by its original holder with $105 plus renewal fees. And since it is a manual process for the registry to add the name, address, and other contact information back to the domain registry records, the process will really take much time. com is the most common top level domain that is used today, for it stands for commercial domains. Of course there are other types and each has its own uses and functions. Moreover, when you go for a domain name registration, you should know that the domain name that is entered into the domain name registration contact information is added to a database of all the available domain names.