How to find your iPad’s, iPhone’s or iPod’s Unique Identifier (UDID) using iTunes
What is the UDID used for?
Every iPad, iPhone and iPod Touch device has what is called a Unique Device Identifer or UDID that assists with controlling what applications are installed on a device. Apple only allows for applications to be downloaded and installed through iTunes. To allow developers the ability to beta test apps, the developer can provide what’s known as an Ad-Hoc distribution to a user allowing the user to install an app without downloading the app through iTunes. In order for the developer to provide someone an Ad-Hoc distribution, they will need to create a Mobile Provisioning file that includes all the UDID’s of the devices that will be testing the app.
How to find your devices UDID
There are a few simple ways to locate your devices UDID. One is through iTunes which is only convenient if you have access to your computer. Another popular way is to download one of the many apps in the app store that do nothing more than open an email containing the devices UDID so that you can email it to someone. A simple search on some of these include: Ad Hoc, UDID Sender and UDIDit.