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Some people say UDID (Unique Device IDentifier) and some say UUID (Universally Unique IDentifier). Are they are the same or not? What are the differences between them?
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UUID: Universal unique identifier, Which is used to identify anything on the internet uniquely. Each app on iPhone has its own UUID. UDID: Unique Device Identifier is used to identify the device uniquely. Usually it is used for registration for remote notifications, Installation and so on.
Examples of UIDs A Uniform Resource Locator (URL) is a particular type of URI that targets Web pages so that when a browser requests them, they can be found and served to users. A Universal Unique Identifier (UUID) is a 128-bit number used to uniquely identify some object or entity on the Internet.
What is a UUID? A UUID is a string of letters and digits that forms a unique pattern. Your Mac, iPhone, and iPad each have one UUID, and no other device shares it.
UDIDs are also available in the Devices window in Xcode. It is the Identifier field, which is available after selecting the device in the list on the left-hand side. Device Token - An identifier for the Apple Push Notification System for iOS devices.
UUID (Universally Unique IDentifier) Is on a per-app basis. identifies an app on a device. As long as the user doesn’t completely delete the app, then this identifier will persist between app launches, and at least let you identify the same user using a particular app on a device. Unfortunately, if the user completely deletes and then reinstalls the app then the ID will change.
UDID (Unique Device Identifier) A sequence of 40 hexadecimal characters that uniquely identify an ios device. This value can be retrieved through iTunes, or found using UIDevice -uniqueIdentifier. Derived from hardware details like MAC address.
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