For identification purposes, aircraft are equipped with a system called "transponder".

This transponder transmits a 4-figure code which can be seen on the radar screens and flight strip.

According to the code, the controllers can identify an aircraft, a group of aircraft or a type of flying.

The codes also enable the controller to easily locate an aircraft declaring an urgency or an emergency.

Each digit shows figures from 0 to 7 only (it is a base-7 system). In all, from 0000 to 7777, 4096 codes are available.

The codes are usually assigned by the controllers except for those 4 dedicated to specific situations :

• 7700 - Emergency, this will be an indication on the controller’s screen that your aircraft has experienced an emergency.

• 7600 - Radio Failure, this code is not used very often on IVAO because we have both Text and Voice communications. If you would like to simulate lost comms procedures, make sure to check with your controller first.

• 7777 - Military Interceptor Operations, consult the IVAO Special operation regulations before engaging in any Military Interceptor Operations.  All air-to-air and air-to-ground excercises and attacks are prohibited on the IVAO network. Our network is established for flight- an ATC simulation, not for war simulation. Fans of wargames are served well on various other places on the Internet.  Our Special Ops regulations can be found here.

• 7500 - Hijack, this code is a part of the tutorial for informational purposes only. Although terrorism and war excist in the real world we do not allow the simulation of any kind of aggression or armed violance on our network. This rule 6.4.1 can be found here.

• 1200- VFR flight, this is the standard squawk code used in North American airspace when no other has been assigned.
• 7000- VFR standard squawk code for most of European airspace.
• 0021- VFR squawk code for German airspace (5000 feet and below)
• 0022-VFR squawk code for German airspace (above 5000 feet) 

When squawking stand-by, controllers can still see the aircraft on their screens but without any tag.

Stand-by is required when on apron, before departure. That way, the pilot does not cause any disturbance in the ground traffic, as all the extra information can clutter the controller's screen. Stop squawking stand-by when taking the active runway for departure.  On an IFR flight, a pilot must sqawk mode C (charlie) at all times if the equipment has been calibrated, unless requested otherwise by the ATC controller. 

Squawk IDENT can also be requested. This highlights the aircraft tag on the controller's screen so that the controller can easily identify the traffic if he/she has a doubt.

IDENT is accessed with the little button in the IvAp window.

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