What is the highest squawk code?

Squawk codes are four-digit codes ranging from 0000 all the way through to 7777 that are set on an aircraft transponder. These unique identifiers allow air traffic control units to distinguish between different aircraft. These work with mode A, mode C, and mode S transponders.



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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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The second emergency squawk code is 7600, showing ATC that the aircraft has lost verbal communication. This could mean that it can still hear ATC and yet not respond, in which case the ATC will direct the pilot to speak with them through the Ident button.

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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. (Codes 2001 to 2077 are available for domestic purposes.)

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For example, 1200 in the USA means that the flight is flying under Visual Flight Rules (VFR) and is not typically in direct contact with ATC. 1200 is a shared code so you may see many aircraft transmitting it at the same time in a given area.

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7777 is the transponder code for fighter jets carrying out an “active air defense mission”, i.e. an emergency interception.

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Setting a squawk of 7700 on the transponder shows that the aircraft is presently dealing with an emergency. The pilot can set it proactively or at air traffic control's request following a 'pan' or 'mayday' call. The squawk code 7700 is a 'catch all' code used for any emergency scenario.

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Squawking 7700 in an emergency The most well know of these is the code 7700. This is used to indicate an emergency of any kind. A pilot will enter this when in an emergency situation - either instructed by ATC after declaring an emergency or without communication if there is no time.

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For example, 1200 in the USA means that the flight is flying under Visual Flight Rules (VFR) and is not typically in direct contact with ATC. 1200 is a shared code so you may see many aircraft transmitting it at the same time in a given area.

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Code 1400: This code is to be used when flying in controlled airspace and you are not receiving a transponder signal from ATC. Code 2000: This code indicates that the aircraft is operating in military airspace different meaning.

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2200. VFR - Operating within a controlled aerodrome circuit. 5000-5777. IFR - Domestic (automated by position)

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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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“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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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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