To track a car using a number plate, you can use a license plate research website like License-Plate-Search.org. These sites will show you information about the car’s current owner information, but they charge a fee for their services. If the license plates are out of date, however, you probably won’t be able to find any information about the owner using the license plate number alone.
As a last resort, report the vehicle to the police. If the car is stolen or abandoned, the police will usually tow the car to an impound lot. You may not find the owner, but at least you won’t have an eyesore in front of your home.