An acronym for Unique Device Identifier - on iOS devices, the UDID is a hexadecimal string 40 characters long and not generally known by end users.

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I have been asked for my UDID, is there any personal information that will be given away should some have this number?

I have been asked my my UDID to beta test apps, is there personal information attached to this number? Such as passwords or account information? Details about the device, I am running ios7.1 on an ...
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258 views

How do I get my (lost) device's serial number from its UDID?

I lost an iPad, and I need the serial number - all I have of it is the UDID. The device is not registered, I don't have the box, and I don't have backups of it either. I suppose that calling Apple ...
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What's the 'unique device identifier' (UDID) of a non-iOS device like a Macbook Pro running Mac OS X?

I wanted to know if the Hardware Serial Number associated with a Macbook Pro is itself treated as a UDID, or is there something else that uniquely identifies the device? I'll provide a little bit ...
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What potential dangers arise from a mass iOS UDID leak?

Can anyone enlighten us with what a hacker could use one (or a list of) UDID for? The leak reported September 4 of 1 million UDID's by AntiSec makes me worry. But should I? What is the worst case ...