If you find a lost pet you can check their microchip by going to this website and entering it. https://www.aaha.org/your-pet/pet-microchip-lookup/microchip-search/

If you don't have a scanner, your local pet shelter does or any vet clinic.

Protecting your pet by registering your pet's microchip with your contact information is critical to recovering your pet should they ever be lost or stolen. Here is a free registry:

https://www.freepetchipregistry.com/

Here is a paid registry:

We microchip our puppies. When we register the puppy with you, your microchip is also reported to the Registry. However, you should enter your information with one of the above.