Driver's license numbers may be found on present checks, past loan applications or previous vehicle registrations. A person may acquire his driver's license number at the DMV by filing a lost or missing license report and providing proof of identity. It is illegal to look up another person's license information.
There are companies that offer to look up other individuals' driver's license information, but most services are illegitimate since it is illegal in almost every state. The DMV strives to protect citizens from identity theft by requiring proof of identity before providing a driver's license number. The guidelines and requirements for providing proof of identity vary for each state, but a social security card, valid passport or identification card is usually necessary.