A bike registration number is a one-of-a-kind number provided by your district’s Regional Transport Office (RTO). No matter what two-wheeler vehicle you have, be it a bike, scooter, or scooty, has a unique registration number. Following the purchase of a bike, the owner must register it with the local RTO within 30 days or 1 month. The RTO issues a bike registration number after a successful registration, which serves as identification for the vehicle and its owner.