A simple, privacy-first way to reach the owner of any car in the United States, using nothing but its license plate.
Everyone has been there: headlights left on in a parking lot, a car blocking a driveway, a window open before a storm, or a dent you watched happen while the owner was nowhere in sight. You can see the car, but there is no way to reach the person who drives it. The license plate is the only thing you know.
PlateQuery started in 2019 as a side project built around that one idea: every license plate should have a page where anyone can leave a note for the owner, and the owner can choose to be told about it. No phone number, no address and no DMV records are involved. The plate is the address.
Since then the site has grown to cover all 50 states and Washington, DC. Alongside messages, plate pages now show public ALPR (automated license plate reader) lookup history taken from public audit records, so people can see when agencies searched a plate in Flock camera networks. We also publish guides on plate laws, parking and privacy in our Resources section.
Any plate in any state can get a message, so small problems get fixed before they turn into tickets, tows or damage.
Senders stay anonymous and we never share email addresses. We never show who owns a car or where they live.
Most messages are a heads-up from someone nearby. We want a quick, polite note to be the easy thing to do.
License plate readers record millions of cars. Publishing public lookup records lets drivers see how their plate is searched.
Owners can claim their plate to manage its messages or make it private.
Parking management for property managers, HOAs and campuses: digital permits, guest passes, plate lookup and enforcement.
Learn about PlateQuery for Business →A read-only API for plate messages and public ALPR lookup history, built for AI agents (MCP) with a REST API underneath.
Explore the API →We read every message. Tell us what is working, what isn't, or what you'd like to see next.