Thanks, Troy. I have already went through the RRDB list. I would really like to know what sites are used to cover specific ares as in districts or divisions. I would then scan by those defined areas. Which seems simple to me but apparently is a guarded issue. LOL
With large multi-site systems like STARS, VIPER, and FiRST (and even on some smaller county level systems), there's little to no guarantee which users and talkgroups will be active on any site. In many cases, you'll find a talkgroup for a particularly set of users is carried on one or more sites on a regular basis. However, you'll also hear that same talkgroup occasionally on "fringe" sites where one minute the talkgroup is active there and the next it is not (caused by radios drfiting into and affiliating with a site in the "fringe" area and then leaving that area).
In "theory", any users can be active on any/all sites - that is, unless the system owners/admins configure certain sites to reject certain radios/user sets - and this is not uncommon. Some talkgroups will be "forced" active on all sites (i.e. fire dispatch) will other talkgroups will be limited to the county (or smaller) they are designed for and those counties/sites immediately adjacent. There are many, many possibilities.