A fax number is a unique identifier assigned to a fax machine or online fax service that allows you to send and receive faxes. It is typically a combination of numbers and/or letters, and it is used to direct faxes to the correct recipient.
There are several ways to find out your fax number. One way is to look for a label on your fax machine. The fax number will usually be printed on a label on the front or back of the machine.