What is code 4000 in aviation?

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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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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0000 — A generic code that is not assigned and should not be used. 1200 — VFR aircraft. The default code for all flights–if you aren't asked to set anything else, you should set 1200. 7500 — Hijacking. 7600 — Voice radio failure.

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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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Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder. (Codes 2001 to 2077 are available for domestic purposes.) Series 75 — Code 7500 is reserved for recognizing an aircraft subject to unlawful interference.

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1000: Mode A transponder code that is reserved for use in Mode S radar/ADS-B setups where aircraft identification is used to correlate flight plan. 2000: Uncontrolled IFR transponder code used when entering a secondary surveillance radar (SSR) area from a non-SSR area.

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Squawk 7000: This is the 'conspicuity code' for VFR aircraft that are not assigned a specific code by ATC. Squawk 2000: This is the 'conspicuity code' for IFR aircraft that are not assigned a specific code 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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These emergency squawk codes are established as a worldwide standard by ICAO: 7500 - Aircraft hijacking. 7600 - Radio failure/lost communications. 7700 - General emergency - This indicates any other kind of emergency, for example, an onboard medical emergency or a mechanical problem.

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“Squawk 1234” means to just dial 1234 into your transponder. The ATC radar will show the controller that number in the tag associated with your plane. If the tell you, “squawk 1244 and ident”, you should put in the code first, and then press and release the Ident (or ID) button on the transponder.

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If you are flying under visual flight rules in uncontrolled U.S. or Canadian airspace, you will use squawk code 1200. You may also hear this referred to as “squawk VFR.” If you're in a controlled airspace, the controller will assign you a unique four-digit squawk code.

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Travelers would be classified into one of three groups: green for good to go, yellow for investigate further and red for stop from flying.

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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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If you're already in communication with ATC, you shouldn't squawk 7700 unless the controller tells you to do so. However, if you're not in communication with ATC, squawking 7700 while transmitting on 121.5 is a quick way to get help.

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“Squawk VFR” or “Squawk 1200” Of course, VFR pilots aren't always talking to controllers. When in Class G or E airspace, they can operate independently without contacting anyone. In these cases, if the plane has a transponder, they set it to the standard VFR code, which is 1200.

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