Finding your iPhone, iPod touch or iPad unique ID (UDID)

Every iPhone, iPod touch and iPad has a unique identifier number associated with it, known as a UDID (Unique Device ID). Your UDID is a 40-digit sequence of letters and numbers that looks like this: 00000000-000000000000000.

It’s common for developers to ask for your UDID as they require it to give you beta copies of iOS apps (this is less common and not needed now with TestFlight).

Finding your UDID in macOS 10.15 Catalina #

Your UDID can be found in Finder. In the Finder sidebar, choose your iPhone, then click area in the header just under your phone’s name until you can see the UDID. Then, right click and choose Copy UDID.

macOS Finder, showing iPhone information and copying the UDID

Finding your UDID in macOS 10.14 Mojave #

  • Open iTunes.
  • Plug in your iPhone, iPod touch or iPad.
  • Click the device icon that’s near the top left of the window.
  • Ensure you’re on the Summary tab.
  • Click on the text that says Serial Number. It should change to say UDID.
  • Select Copy from the Edit menu.
  • Your UDID is now in the clipboard, so you can paste it into an email or message.

Finding your iPhone UDID in iTunes for Mac

Finding your UDID in macOS 10.13 High Sierra and prior #

  • Open iTunes.
  • Plug in your iPhone, iPod touch or iPad.
  • Click its name under the devices list.
  • Ensure you’re on the Summary tab.
  • Click on the text that says Serial Number. It should change to say Identifier (UDID).
  • Select Copy from the Edit menu.
  • Your UDID is now in the clipboard, so you can paste it into an email or message.

Finding your UDID on Windows #

  • Open iTunes.
  • Plug in your iPhone, iPod touch or iPad.
  • Click its name under the devices list.
  • Ensure you’re on the Summary tab.
  • Click on the text that says Serial Number. It should change to say Identifier (UDID).
  • Select Copy from the Edit menu.
  • Your UDID is now in the clipboard, so you can paste it into an email or message.