What is the 4 digit code for aircraft?

Squawk codes are what air traffic control (ATC) use to identify aircraft when they are flying. They are unique four-digit numbers and range from 0000 to 7777; some of which are fixed values signifying specific scenarios (see below), others being randomly generated by ATC.



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A Squawk 7700 indicates an emergency. This can be an emergency of any kind. Pilots may input it into the transponder themselves – or when instructed to do so by ATC. As a result, ground control will know that the aircraft is dealing with a serious issue and needs help.

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Squawking 7500 signifies an aircraft being hijacked and could result in an aircraft being escorted by military forces.

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Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder.

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Transponder codes This allows easy identification of aircraft on radar. Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits can represent up to 4096 different codes, which is why such transponders are sometimes described as 4096 code transponders.

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The 3 Must-Know Aircraft Emergency Squawk Codes For Pilots
  • 7700 – Distress or Urgency Condition. Before we begin discussing emergencies, let's define our terms as listed in the Pilot/Controller Glossary. ...
  • 7600 – Two-Way Radio Communication Failure (NORDO) ...
  • 7500 – Air Piracy (Hijacking or Hostile Acts Onboard)


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Military aircraft operating in restricted/warning areas or on VR routes will squawk 4000 unless another code has been assigned or coordinated with ATC.

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This notice assigns Code 1202 for use by gliders not in contact with an air traffic control (ATC) facility. The notice also provides general flight characteristics of gliders and some of their limitations.

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1200 is a shared code so you may see many aircraft transmitting it at the same time in a given area. In other parts of the world such as Europe, 7000 is used for VFR flights. The most widely recognized squawk codes are the 3 codes which indicate emergency situations.

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SQUAWK MAYDAY ON 7700.

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