Don't ask, all the data is already in this site's database already. It may not be up-to-the-moment accurate, but generally public safety radio systems don't change their talkgroup allocations more than absolutely necessary as every change requires reprogramming every affected radio.
Don't ask, because too much interest is a driving factor in some paranoid system administrator deciding it's time to flip the Encryption Switch.,
Don't ask, because you attract attention to yourself. Don't be the nail that sticks up . Don't get the highest heat score in the area.
You said you have an APX900 and that means that you are going to have to do the tricks that must be done in order to use your radio to listen safely, the NAS method. Screw it up and your radio will become known to the system administrator and if he's not very tolerant of such shenanigans, your radio will be monitored, traced, or inhibited. This can lead to legal trouble for you.
You have been warned.