Form iOS 7 UDID is not available for public API so it can't be extracted from any of the applications available in the market.
If you are using iOS 6 then it can easily be found by downloading this application :
UDID + by eMonster
But for iOS 7 we need to connect the device from iTunes and from there we can extract the UDID of device. (If we still use the application then we will get UDID Starting from FFFFFF means a Fake UDID. )
Here is the process explained.
1. Connect the device and open the iTunes navigate to iPhone
2. Then Click on the serial Number
3 . Right Click to Copy the UDID.
For Reference: http://
