UDID Registration

How to find your device's UDID for development or beta testing

A UDID (Unique Device Identifier) is a 40-character string that uniquely identifies your Apple device. You may need it for:

• Joining OTA (over-the-air) beta distributions

• Registering your device on an Apple Developer account for sideloading

• Troubleshooting device-specific issues

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How to Find Your UDID

iPhone / iPad (On-Device)

Using a web tool

1. Open Safari on your device and visit udid.tech or ipsw.me/device-finder

2. Follow the prompts to install a temporary configuration profile

3. Your UDID will be displayed — tap to copy it

4. The profile can be removed afterward in Settings → General → VPN & Device Management

These tools install a temporary profile to read your UDID. The profile can be safely removed after you've copied the identifier.

macOS (Finder)

Using Finder (macOS Catalina and later)

1. Connect your iPhone/iPad to your Mac via USB

2. Open Finder and select your device under Locations in the sidebar

3. Click the device name or model at the top of the pane

4. A summary appears showing Capacity, Phone Number, and Serial Number

5. Click on Serial Number — it cycles through: Serial Number → UDID → ECID → Model Number

6. When UDID is displayed, right-click → Copy UDID

Using System Information

1. Connect your device via USB

2. Click → About This Mac → More Info → System Report

3. Select USB in the sidebar

4. Find your device under the USB bus

5. The Serial Number shown here is your UDID (you may need to add a dash after the 8th character)

Windows

Using Apple Devices app

1. Install the Apple Devices app from the Microsoft Store

2. Connect your iOS device via USB

3. Select your device by clicking its image

4. A summary shows Capacity, Phone Number, and Serial Number

5. Click on Serial Number — it changes to display your UDID

6. Right-click to copy

Linux

Using lsusb

1. Connect your device via USB

2. Run:

lsusb -v 2> /dev/null | grep -e "Apple Inc" -A 2

1. The serial number shown is your UDID

Using libimobiledevice

For more reliable detection, install libimobiledevice:

# Debian/Ubuntu
sudo apt install libimobiledevice-utils

# Fedora
sudo dnf install libimobiledevice-utils

# Then run:
idevice_id -l

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Registering Your UDID

Once you have your UDID, it needs to be registered on an Apple Developer account:

If you're a developer:

1. Log in to developer.apple.com

2. Go to Certificates, Identifiers & Profiles → Devices

3. Click + to register a new device

4. Enter a name and paste your UDID

5. Click Continue → Register

If you're joining a beta:

• Send your UDID to the developer who invited you (they'll register it on their account)

Free Apple Developer accounts can register up to 10 devices per year (across all device types). Paid accounts support up to 100 devices per device type.

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