Current Directory services Online directory services can be divided into two groups, White Pages and Yellow Pages. White Pages provide a means of searching for people and computers on the net.
Yellow pages provide for searching for businesses.
This section covers a selection of tools commonly used for providing Internet directory services. Some of the tools such as CSO and Whois are used mainly for local directories, while others such as X.500 and LDAP can be used globally. Though the net cast by these tools collectively catches the contact details of millions of people, there are still many people covered only by local directories which use tools other than those listed here. See also Searching for people in the User Overview for general guidelines.