See the WIKI for new/old/unconfirmed frequencies/licenses and other info (unit designators, Fire Tone-Outs)

All DNR districts are now using the SAFE-T system as primary communications. Former analog frequencies are listred in the WIKI. 

DNR units may have access to area county LAW talkgroups (like District 5 may be on Parke County 61-SO-DISP)

Frequencies

Department of Natural Resources (DNR)

DNR
Indiana Project Hoosier SAFE-T
Project 25 Phase I
Primary communications