Apparatus

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sensors Mode-S transponder

AD071B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N939AC · CESSNA 152 · operated by FLORIDA FLIGHT TRAINING CENTER INC

Hex
AD071B
Octal
53203433
Decimal
11,339,547
Country
US
Tail
N939AC
Type
C152
No current signal · last broadcast 4d ago
Flights observed
121
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S AD071B.

Country allocation

The ICAO 24-bit address AD071B falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N939AC - 121 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 N939AC VNC → VNC Jul 10, 15:25 UTCJul 10, 16:10 UTC45m
2026-07-10 N939AC - Jul 10, 14:05 UTCJul 10, 14:45 UTC40m
2026-07-10 N939AC - Jul 10, 12:45 UTCJul 10, 13:15 UTC30m
2026-07-09 N939AC VNC → VNC Jul 9, 19:15 UTCJul 9, 20:10 UTC55m
2026-07-09 N939AC - Jul 9, 13:20 UTCJul 9, 14:05 UTC45m
2026-07-08 N939AC - Jul 8, 23:40 UTCJul 9, 00:35 UTC55m
2026-07-08 N939AC VNC → VNC Jul 8, 21:40 UTCJul 8, 22:40 UTC1h 0m
2026-07-08 N939AC - Jul 8, 16:35 UTCJul 8, 17:10 UTC35m
2026-07-07 N939AC - Jul 7, 13:55 UTCJul 7, 14:25 UTC30m
2026-07-06 N939AC - Jul 6, 14:55 UTCJul 6, 15:35 UTC40m
2026-07-03 N939AC VNC → VNC Jul 3, 13:40 UTCJul 3, 14:35 UTC55m
2026-07-02 N939AC VNC → VNC Jul 2, 15:50 UTCJul 2, 16:15 UTC25m
2026-07-01 N939AC - Jul 1, 13:00 UTCJul 1, 13:45 UTC45m
2026-07-01 N939AC - Jul 1, 11:15 UTCJul 1, 12:00 UTC45m
2026-06-30 N939AC VNC → VNC Jun 30, 14:20 UTCJun 30, 14:50 UTC30m
2026-06-30 N939AC - Jun 30, 11:50 UTCJun 30, 13:25 UTC1h 35m
2026-06-29 N939AC - Jun 29, 14:29 UTCJun 29, 15:45 UTC1h 15m
2026-06-27 N939AC VNC → VNC Jun 27, 11:39 UTCJun 27, 12:04 UTC25m
2026-06-26 N939AC - Jun 26, 11:40 UTCJun 26, 12:29 UTC50m
2026-06-25 N939AC VNC → VNC Jun 25, 18:04 UTCJun 25, 18:45 UTC40m
2026-06-25 N939AC VNC → VNC Jun 25, 14:44 UTCJun 25, 15:24 UTC40m
2026-06-24 N939AC - Jun 24, 17:34 UTCJun 24, 18:34 UTC1h 0m
2026-06-24 N939AC - Jun 24, 08:49 UTCJun 24, 10:25 UTC1h 35m
2026-06-24 N939AC - Jun 24, 06:35 UTCJun 24, 07:30 UTC55m
2026-06-24 N939AC - Jun 24, 05:54 UTCJun 24, 06:29 UTC35m
2026-06-23 N939AC - Jun 23, 23:55 UTCJun 24, 00:59 UTC1h 5m
2026-06-23 N939AC - Jun 23, 11:40 UTCJun 23, 13:09 UTC1h 30m
2026-06-22 N939AC - Jun 22, 16:40 UTCJun 22, 17:40 UTC1h 0m
2026-06-22 N939AC - Jun 22, 13:05 UTCJun 22, 14:45 UTC1h 40m
2026-06-22 N939AC VNC → VNC Jun 22, 11:35 UTCJun 22, 12:19 UTC45m
2026-06-21 N939AC - Jun 21, 13:39 UTCJun 21, 14:15 UTC35m
2026-06-21 N939AC - Jun 21, 09:55 UTCJun 21, 11:34 UTC1h 40m
2026-06-21 N939AC - Jun 21, 07:29 UTCJun 21, 09:00 UTC1h 30m
2026-06-20 N939AC VNC → VNC Jun 20, 23:10 UTCJun 21, 00:29 UTC1h 20m
2026-06-19 N939AC - Jun 19, 15:49 UTCJun 19, 16:49 UTC1h 0m
2026-06-19 N939AC - Jun 19, 13:39 UTCJun 19, 14:29 UTC50m
2026-06-18 N939AC - Jun 18, 12:00 UTCJun 18, 13:40 UTC1h 40m
2026-06-16 N939AC - Jun 16, 17:15 UTCJun 16, 17:40 UTC25m
2026-06-16 N939AC - Jun 16, 15:50 UTCJun 16, 16:10 UTC20m
2026-06-15 N939AC - Jun 15, 15:45 UTCJun 15, 16:30 UTC45m
2026-06-14 N939AC - Jun 14, 20:35 UTCJun 14, 21:10 UTC35m
2026-06-14 N939AC - Jun 14, 19:25 UTCJun 14, 19:55 UTC30m
2026-06-14 N939AC - Jun 14, 16:30 UTCJun 14, 17:15 UTC45m
2026-06-14 N939AC VNC → VNC Jun 14, 14:30 UTCJun 14, 15:15 UTC45m
2026-06-12 N939AC - Jun 12, 14:05 UTCJun 12, 14:30 UTC25m
2026-06-10 N939AC - Jun 10, 13:00 UTCJun 10, 14:25 UTC1h 25m
2026-06-10 N939AC - Jun 10, 10:55 UTCJun 10, 12:05 UTC1h 10m
2026-06-09 N939AC - Jun 9, 17:50 UTCJun 9, 18:35 UTC45m
2026-06-08 N939AC VNC → VNC Jun 8, 18:50 UTCJun 8, 19:40 UTC50m
2026-06-07 N939AC - Jun 7, 13:25 UTCJun 7, 14:45 UTC1h 20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N939AC page for operator, model, and routing details .

Mode-S AD071B frequently asked

What is Mode-S code AD071B?
AD071B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N939AC.
Where is Mode-S AD071B registered?
Mode-S code AD071B is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is AD071B broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD071B, octal 53203433, decimal 11,339,547.
What flights does AD071B operate?
Mode-S AD071B has broadcast 1 distinct callsign, including N939AC.