For this type of aircraft owned, you can find it on this page.
A tail number refers to an identification number painted on an aircraft, frequently on the tail. In Indonesia, these are grouped based on the aircraft function and the type of aircraft. Among them are Fighters, Transports, helicopters, Trainers, and SAR. The composition of the tail number is Aircraft Function-two numbers ahead of the aircraft type and then followed the numbers sort (X-YYZZ). eg. Cargo owned by Indonesian Air Force (code: A), a type of aircraft is C-130 (code: 13), then the numbers of sort is 01, so the tail number is A-1301.
For more details the following is a list of aircraft type code:
|Indonesia Air Force||Reconnaissance||AI|
|Indonesia Air Force||Heli Trainer||HL|
|Indonesia Air Force||Heli Fighter||HT|
|Indonesia Air Force||Heli Cargo||H|
|Indonesia Air Force||Basic Trainer||LD|
|Indonesia Air Force||Advance Trainer||LL|
|Indonesia Air Force||Fighter Trainer||TL|
|Indonesia Air Force||Tactic Fighter||TT|
|Indonesia Air Force||Fighter||TS|
|Indonesia Navy Force||Cargo||U|
|Indonesia Navy Force||Reconnaissance||P|
|Indonesia Navy Force||Basic Trainer||L|
|Indonesia Navy Force||Heli Cargo||HU/NV|
|Indonesia Navy Force||Heli Fighter||HS|
|Indonesia Army Force||Cargo||A|
|Indonesia Army Force||Heli Cargo||HA|
|Indonesia Army Force||Heli Fighter||HS|
When logon to IvAP you are prompted to enter the IVAP "callsign" and the above codes can be used in accordance with the aircraft that you are using. Then, what's code for each aircraft? As already described above, each aircraft having the code in accordance with the type of aircraft.