Valid UDIDs?
<p><strong>Duplicate: <a href="http://stackoverflow.com/questions/772858/validate-iphone-device-ids/774518#774518">http://stackoverflow.com/questions/772858/validate-iphone-device-ids/774518#774518</a></strong></p>

<p>Does anyone know what constitutes a valid iPhone UDID?</p>

<p>Context: I am working on some session code for a server that interacts with iPhones, and was going to use the iPhone's UDID as a unique identifier.  However, I can't seem to find any resources on the range of valid UDIDs, and I want to know exactly what I can expect coming from an iPhone.</p>

<p>Clarification: I'm not asking about how to validate an iPhone UDID as a legitimate iPhone UDID, I'm trying to figure out the range of UDIDs.  For example, in programming languages there are specs on what you can use to name your variables (starts with a letter, contains letters and numbers, etc.).  I want the same sort of spec for the UDID.</p>
