What is UDID?

UDID stands for Unique Device Identifier. It is a 40-character string composed of a combination of letters and numbers. It is used by Apple to identify individual iOS devices such as iPhone, iPad, and iPod touch. It is used to identify each device for development and testing purposes.

Why is UDID important?

The UDID is important because it helps developers track the usage of their applications and assess their performance. It also helps them identify users and their preferences. UDID is also used by app developers to build targeted campaigns and segment their user base.

How to find UDID?

Finding the UDID of an iPhone, iPad, or iPod touch is fairly simple:

  • Connect your device to your computer and open iTunes.
  • Select your device in the list.
  • Click the serial number in the device details panel.
  • The UDID will be displayed.


In conclusion, UDID is an important identifier used by Apple and app developers to track the usage of their applications and identify users. UDID is necessary for development and testing purposes and can be easily found in iTunes.

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