How to Find Your iPhone UDID (Mac and Windows)

ByScarlet iOS Team Updated on

The UDID (Unique Device Identifier) is a long code that identifies one specific iPhone or iPad. You need it when an app is signed with a paid Apple Developer account, because the provisioning profile has to list every device the app may run on. Since iOS 10.2, Settings on the iPhone no longer shows it, so you find it with a computer. This guide shows how, step by step, on a Mac and on Windows. Last checked: October 27, 2026, against Apple’s Xcode and developer account help.

The Short Version

  • On a Mac: connect the iPhone, select it in Finder, and click the text under the device name until the device ID (UDID) appears.
  • On Windows: connect the iPhone, open it in iTunes, and click the serial number on the Summary tab; the first click shows the UDID.
  • With Xcode: open Window > Devices and Simulators and read the Identifier field.
  • The UDID is not shown in Settings on current iOS versions.
  • You only need it to register a device on a paid developer account. Free Apple ID tools such as SideStore, AltStore and Sideloadly do not ask you for it.

When Do You Need Your UDID?

Apps signed with a development or ad hoc profile only run on devices listed in that profile. Apple’s developer help says that to register a device you need its name and its UDID. So you need the UDID when:

  • You (or someone with an Apple Developer Program membership) register your iPhone to sign apps for it.
  • An app fails with “integrity could not be verified” because your device is missing from the profile; see how to fix the integrity error.

You do not need it for App Store apps, for Scarlet iOS, or for tools that sign with your free Apple ID.

Find the UDID on a Mac with Finder

From Apple’s Xcode help:

  1. Connect your iPhone or iPad to your Mac with a cable.
  2. In Finder, select the device under Locations in the sidebar. If a Trust button appears, click it, and tap Trust on the iPhone too.
  3. Under the device name, click the device family name. It changes to show the serial number and device ID (UUID).
  4. Control-click the identifier and choose Copy.

Find the UDID on a Mac with Xcode

  1. Connect the device to your Mac.
  2. In Xcode, choose Window > Devices and Simulators.
  3. Click Devices at the top and select your device on the left.
  4. The UDID is in the Identifier field.

Find the UDID on Windows with iTunes

  1. Connect your iPhone to the PC, unlock it and tap Trust if it asks.
  2. Open iTunes and click the device icon near the top left.
  3. On the Summary tab, click Serial Number. The first click shows the UDID (further clicks show other identifiers such as the ECID).
  4. Right-click the UDID and choose Copy.

This method is described by developers on Apple’s Developer Forums. If your PC uses a different Apple app to manage the iPhone, look for the same identifier on the device’s summary page.

Be Careful with UDID Websites and Profiles

Some websites offer to read your UDID by installing a configuration profile on the iPhone. A profile can change settings on your device, so only install one from a source you trust, and remove it afterwards in Settings > General > VPN & Device Management. The computer methods above need no profile and share the UDID with nobody. Also keep in mind that whoever has your UDID can register your device on their developer account: share it only with someone you trust to sign apps for you.

Register the UDID on a Developer Account

If you have your own Apple Developer Program membership, Apple’s help describes the steps:

  1. Sign in to Certificates, Identifiers & Profiles on developer.apple.com and click Devices.
  2. Click the add button (+), choose the platform and enter a device name and the UDID.
  3. Click Continue, check the details and click Register.
  4. Create or regenerate the provisioning profile so it includes the device, then sign the app again.

Apple allows up to 100 devices per product family (for example iPhone or iPad) per membership year, and lets you reset the list at the start of a new membership year. If you use Xcode’s automatic signing, Xcode registers a connected device for you. For how paid accounts compare with free ones, see Apple Developer account vs free sideloading, and for signing a file yourself, how to re-sign IPA files.

FAQ

Can I find the UDID in Settings?

No. Since iOS 10.2 the UDID is not shown in Settings. Use Finder, Xcode or iTunes on a computer.

Is the UDID the same as the serial number or IMEI?

No. The serial number and IMEI are shown in Settings > General > About; the UDID is a separate, longer identifier used for app signing.

Do I need my UDID for Scarlet iOS?

No. Scarlet signs apps with a shared certificate that is not tied to device UDIDs. Scarlet is confirmed on iOS 14 through iOS 26; iOS 27 support is reported by third parties but not officially confirmed.

Does SideStore or Sideloadly need my UDID?

Not from you. You sign in with your Apple ID and connect the device, and the tool signs the app for that device. See our SideStore and Sideloadly guides.

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