An Update Request Number or URN is an ID composed of 14 digits that applies uniquely every time a change/update request is made on an Aadhaar card. You can also consider it as a reference ID for your application. URN stands for Update Request Number in the context of an Aadhaar card. It is a 14-digit number that’s used to track the update status of your applied request. URN stands for Uniform Resource Name. It is a URI that uses a URN scheme. " urn " scheme: It is followed by a namespace identifier, followed by a colon, followed by namespace specific string. URN does not imply the availability of the identified resource. What is 'Uniform Resource Name ( URN )'? Discover how to master Uniform Resource Name ( URN ), with free examples and code snippets.