I am looking for a way to validate an IPA or mobileprovision file, to see if all my test devices have been added before i distribute the app for beta-testing.
Open the .mobileprovision file in a text editor. The devices included will be listed under the ProvisionedDevices element of the plist section.
If you use testflight, it automatically compares the devices in the profile with your registered testers.
An IPA's contents can be inspected by copying the file, renaming it as .zip and unzipping it. Inside there you will find .mobileprovision files.