What is the highest code on a transponder?

For certain type of flights and/or situations, specific transponder codes are used. Thus the lowest possible squawk is 0000 and the highest is 7777. Four octal digits can represent up to 4096 different codes, which is why such transponders are often called 4096 code transponders.



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

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7000: Standard VFR transponder code to be used when no other code has been assigned. 7500: Aircraft hijacking. 7600: Radio failure. 7700: General Emergency.

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The International Civil Aviation Organization (ICAO) has a list of six transponder codes that have been standardized for global use. They are: 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.

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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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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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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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The number 4096 comes from the number of different codes you can make out of 7 different numbers in sets of 4. A mode C transponder is required to enter class A airspace, fly within 30 nautical miles of primary airports in class B airspace, or fly in or above class C airspace.

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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 7600. Code 7600 is the code for a loss of radio. If a pilot's radio goes out during a fight, they can enter 7600 into the transponder. Then they should proceed to their intended airport following a standard landing plan. Pilots should be extra careful and on alert for other aircraft around them in the sky.

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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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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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By international agreement, 2000 is used for aircraft which have not been assigned a transponder code, although in some parts of Europe, 7000 is used for this purpose. Details of standard codes in different countries may be found in national Aeronautical Information Publications (AIPs).

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