About UDID.io

Udid.io was created by MacBuildServer team to get easy access to users' device UDIDs when developing enterprise iOS applications and testing of apps.

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What is UDID?

UDID is the short form for Unique Device Identifier. It is a 40-character long value containing alpha-numeric symbols (a-z and 0-9). The UDID is being used by developers to register devices for testing their Apps. Only on registered devices developers can run Apps that are not in Apple's AppStore yet. Developers currently have up to 100 UDIDs they can register.

Note, that UDID of your device may change in the case of changing some part of it, for example after repair, because on some models UDID is generated partically from MAC-addresses of network interfaces your device have.

What is Serial number of the phone or tablet?

iPhone or iPad Serial Number identifies device model. It is provided by manufacturer. As serial number of any device it may contain party number or any other info related to device model you're hold in your hands. Some Apple™ support resources are asking Serial no. of your device to give you more relevant info or provide you more accurate support.

What is IMEI?

IMEI is The International Mobile Station Equipment Identity /aɪˈmiː/. It is unique identifier across all mobile phones, as well as some satellite phones too. The IMEI number is used by a GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing that network.

What to beware of?

Avoid spreading of IMEI and UDID to third-parties you don't trust, because you may facilitate the work of thefts and fraudsters. Anyway, if bad things happen contact Apple support and police and be guided by the laws of the country where incident provoked.

Official UDID documentation

You may refer to the official Apple™ documentation to get more info on how to obtain UDID, IMEI and other device specific IDs.

For additional help or any suggestions reach us via e-mail
[email protected]