PrintUnfortunately, there is no one central list of all companies that operate online. There are, however, several sources that offer extensive, though still partial, lists of online companies.
BizWeb is a Web guide company that lists more than 43,000 companies in almost 200 industry categories. You can search for companies that operate online by industry.
If you are wondering if a specific company operates online, you might turn to a company research firm for information. Many company research businesses are now adding Web site addresses to their databases of general company info.
Finally, if you're wondering if a particular Web site address is taken or who's behind a particular site, turn to Network Solutions. This company keeps a database of every registered URL and its owner.