The first level of localization is achieved by limiting URLs to registered domain names 106. IPLink extracts domain names from the New URL database and then queries the InterNIC database 122 where records of registered domain names containing company name, contact, street address, and Internet Protocol (IP) addresses are kept. This InterNIC database can be accessed through the Unix whois(1) command. YPLink merges the InterNIC address database 108 with the Yellow Pages data 110. This process is described in detail below.