This guide provides you with information on how to download and extract your cPanel zone file.
NOTE: By default, cPanel does not provide a method of downloading a zone file alone which contains the all the DNS Zones of the domains on a particular cPanel account. However the file does exist and there is a simple trick to find this file.
Step 1 - You will need to use the cPanel Backup Wizard to make a Full Backup of your cPanel account (click here for a guide). Download the backup to your computer once it's complete.
Step 2 - Open the backup file using a program like WinRAR or 7zip and extract the files.
Step 3 - In the extracted files, look for a folder titled dnszones and open it up
The list of files here are the zone files for each domain on that cPanel account. You can view them by opening the file with any text editor (Notepad, Microsoft Word, etc)
TIP: Should you require more information regarding cPanel functions please see cPanel.