Individuals can find the fax number for a business on the website of the business or by searching for the number in an online phone directory, such as Whitepages. Alternatively, they can call the business directly to request its fax number.
If an individual already has a fax number and wants to know the business it belongs to, he or she can perform a reverse lookup search on a phone directory website. In some cases, businesses prefer not to have their fax numbers listed or available online. Calling the business to find out its fax number is the only solution in these cases.