The make and model of the car. The car’s Vehicle Identification Number (VIN). If you have an opportunity to get close enough to the car, you can find the VIN on most cars by looking through the windshield at the bottom corner of the dashboard on the driver’s side. The license plate number. Any particular distinguishing features, such as unusual accessories, paint job, or damage to the car.

Contact your insurance company for help locating any insurance related documents. If you don’t have the records yourself, their record system may include information that can help you.

Be careful not to post too much private information about yourself. If you set up a meeting with the person you contact, keep it in an open, public location where you will be safe.

If available, you might consider posting a photo of the car in question. For example, suppose a car is illegally parked in your neighborhood, and you’re trying to reach out to the owner. Posting a photo of the car on a neighborhood Facebook group might just catch someone’s eye.