How many discrete transponder codes are available to ATC?

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Multiple Choice

How many discrete transponder codes are available to ATC?

Explanation:
Transponder codes are four-digit octal numbers used by ATC to identify aircraft on radar. Each digit can be 0 through 7, giving 8 possibilities per digit. Multiply for four digits: 8 × 8 × 8 × 8 = 4096. So there are 4,096 discrete transponder codes available for ATC to assign. Note that some codes are reserved for special purposes, but the total pool is 4,096.

Transponder codes are four-digit octal numbers used by ATC to identify aircraft on radar. Each digit can be 0 through 7, giving 8 possibilities per digit. Multiply for four digits: 8 × 8 × 8 × 8 = 4096. So there are 4,096 discrete transponder codes available for ATC to assign. Note that some codes are reserved for special purposes, but the total pool is 4,096.

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