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
How to Find Your UDID
Using a web tool
Open Safari on your device and visit udid.tech or ipsw.me/device-finder
Follow the prompts to install a temporary configuration profile
Your UDID will be displayed — tap to copy it
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.
Using Finder (macOS Catalina and later)
Connect your iPhone/iPad to your Mac via USB
Open Finder and select your device under Locations in the sidebar
Click the device name or model at the top of the pane
A summary appears showing Capacity, Phone Number, and Serial Number
Click on Serial Number — it cycles through: Serial Number → UDID → ECID → Model Number
When UDID is displayed, right-click → Copy UDID
Using System Information
Connect your device via USB
Click → About This Mac → More Info → System Report
Select USB in the sidebar
Find your device under the USB bus
The Serial Number shown here is your UDID (you may need to add a dash after the 8th character)
Using Apple Devices app
Install the Apple Devices app from the Microsoft Store
Connect your iOS device via USB
Select your device by clicking its image
A summary shows Capacity, Phone Number, and Serial Number
Click on Serial Number — it changes to display your UDID
Right-click to copy
Registering Your UDID
Once you have your UDID, it needs to be registered on an Apple Developer account:
If you're a developer:
Log in to developer.apple.com
Go to Certificates, Identifiers & Profiles → Devices
Click + to register a new device
Enter a name and paste your UDID
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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