However, if your ID was issued after January 28, 2014, you will find the document number on the back of your card. In New York State, the document number is typically an 8 or 10 digit alphanumeric code found on the lower-right corner of your license, permit, or non-driver ID. This number can be used to track your driving record, criminal history, and other personal details. The document number is primarily used by government agencies and law enforcement to identify individuals and validate the authenticity of their ID. This sequence is known as the document number or DD (document discriminator) and is a crucial piece of information on your ID. If you have ever applied for a driver’s license, permit or non-driver ID, you may have come across a unique alphanumeric sequence on your card.