Originally Posted by awattam
You have a premium subscription for this site which means you can see (and download) the FCC licenses for your county. That might help you.
That, and/or use the proximity search.
Though in either case it's somewhat doubtful a security company is going to maintain it's own license(s) and equipment. Either they'll lease equipment, use facility provided equipment, use SouthernLinc, MURS, some combination of those, or not use radios at all. If they're really cheesy then I guess it's even possible they might use FRS/GMRS radios. hehe
Airport security may use some TSA freqs., IF the TSA maintains a presence there.