From Splashtop Business app (v3400 or later)
Splashtop Business app / Help / About...
From Splashtop Streamer (v3400 or later)
Streamer / About
From SOS agent (v3400 or later)
SOS agent / Settings / About
From web console
If you login to my.splashtop.com -> your account is on the Global region
If you login to my.splashtop.eu -> your account is on the EU region
If you login to my.splashtop.nr -> you account is on the NR region