try searching between 450 and 470 mhz during practice or heats. That's the easiest way then there are fewer cars on the track and you can kind of figure out what freq is who by matching what the spotter is doing by what the cars on the track are. That or ask someone at the track that you see that has a scanner. Odds are you aren't going to find a website for frequencies for most local tracks unless its done by an individual. I've never found lists for tracks i frequent. as far as the track goes, they may have their own license and then you could search the FCC database for that. Those are my thoughts on that, you'll probably have to find them yourself, but that's kind of the fun of scanning.