Apparatus

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sensors Mode-S transponder

A54CFB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4400F · PIPER PA-28-140/150/160/180 · operated by CAE OXFORD AVIATION ACADEMY PHOENIX INC

Hex
A54CFB
Octal
51246373
Decimal
10,833,147
Country
US
Tail
N4400F
Type
P28A
No current signal · last broadcast 14h ago
Flights observed
192
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A54CFB.

Country allocation

The ICAO 24-bit address A54CFB 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
OXF3571 - 192 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 OXF3571 - Jul 13, 18:55 UTCJul 13, 19:25 UTC30m
2026-07-13 OXF3571 - Jul 13, 18:20 UTCJul 13, 18:45 UTC25m
2026-07-13 OXF3571 - Jul 13, 15:25 UTCJul 13, 17:35 UTC2h 10m
2026-07-13 OXF3571 - Jul 13, 11:00 UTCJul 13, 12:35 UTC1h 35m
2026-07-12 OXF3571 MSC → MSC Jul 12, 18:15 UTCJul 12, 20:10 UTC1h 55m
2026-07-12 OXF3571 MSC → MSC Jul 12, 15:10 UTCJul 12, 16:30 UTC1h 20m
2026-07-11 OXF3571 - Jul 11, 21:00 UTCJul 11, 21:35 UTC35m
2026-07-11 OXF3571 - Jul 11, 19:40 UTCJul 11, 20:15 UTC35m
2026-07-10 OXF3571 - Jul 10, 18:50 UTCJul 10, 21:30 UTC2h 40m
2026-07-09 OXF3571 - Jul 9, 13:10 UTCJul 9, 14:15 UTC1h 5m
2026-07-08 OXF3571 - Jul 8, 19:15 UTCJul 8, 21:05 UTC1h 50m
2026-07-08 OXF3571 - Jul 8, 15:55 UTCJul 8, 17:30 UTC1h 35m
2026-07-07 OXF3571 - Jul 7, 19:55 UTCJul 7, 21:50 UTC1h 55m
2026-07-07 OXF3571 - Jul 7, 14:20 UTCJul 7, 16:20 UTC2h 0m
2026-07-06 OXF3571 - Jul 6, 16:45 UTCJul 6, 18:40 UTC1h 55m
2026-07-06 OXF3571 - Jul 6, 14:10 UTCJul 6, 15:10 UTC1h 0m
2026-07-06 OXF3571 - Jul 6, 01:00 UTCJul 6, 02:35 UTC1h 35m
2026-07-05 OXF3571 - Jul 5, 18:45 UTCJul 5, 21:00 UTC2h 15m
2026-07-05 OXF3571 - Jul 5, 15:25 UTCJul 5, 17:25 UTC2h 0m
2026-07-04 OXF3571 - Jul 4, 14:30 UTCJul 4, 17:45 UTC3h 15m
2026-07-02 OXF3571 - Jul 2, 18:45 UTCJul 2, 20:35 UTC1h 50m
2026-07-02 OXF3571 - Jul 2, 15:45 UTCJul 2, 16:45 UTC1h 0m
2026-07-02 OXF3571 - Jul 2, 13:15 UTCJul 2, 14:55 UTC1h 40m
2026-07-01 OXF3571 - Jul 1, 19:10 UTCJul 1, 20:40 UTC1h 30m
2026-07-01 OXF3571 - Jul 1, 16:15 UTCJul 1, 17:55 UTC1h 40m
2026-07-01 OXF3571 SCF → MSC Jul 1, 13:40 UTCJul 1, 14:25 UTC45m
2026-07-01 OXF3571 - Jul 1, 13:20 UTCJul 1, 13:35 UTC15m
2026-06-30 OXF3571 - Jun 30, 19:30 UTCJun 30, 21:15 UTC1h 45m
2026-06-30 OXF3571 - Jun 30, 16:35 UTCJun 30, 18:15 UTC1h 40m
2026-06-30 OXF3571 - Jun 30, 14:30 UTCJun 30, 15:40 UTC1h 10m
2026-06-30 OXF3571 - Jun 30, 12:45 UTCJun 30, 13:45 UTC1h 0m
2026-06-28 OXF3571 - Jun 28, 18:05 UTCJun 28, 18:34 UTC30m
2026-06-28 OXF3571 - Jun 28, 13:59 UTCJun 28, 15:05 UTC1h 5m
2026-06-27 OXF3571 - Jun 27, 20:09 UTCJun 27, 21:19 UTC1h 10m
2026-06-27 OXF3571 - Jun 27, 17:25 UTCJun 27, 19:19 UTC1h 55m
2026-06-27 OXF3571 - Jun 27, 14:54 UTCJun 27, 16:20 UTC1h 25m
2026-06-27 OXF3571 - Jun 27, 13:09 UTCJun 27, 14:20 UTC1h 10m
2026-06-26 OXF3571 - Jun 26, 20:20 UTCJun 26, 21:45 UTC1h 25m
2026-06-26 OXF3571 - Jun 26, 16:20 UTCJun 26, 17:25 UTC1h 5m
2026-06-26 OXF3571 - Jun 26, 13:40 UTCJun 26, 15:05 UTC1h 25m
2026-06-25 OXF3571 - Jun 25, 18:59 UTCJun 25, 20:25 UTC1h 25m
2026-06-25 OXF3571 MSC → MSC Jun 25, 15:40 UTCJun 25, 17:09 UTC1h 30m
2026-06-24 OXF3571 - Jun 24, 19:10 UTCJun 24, 20:44 UTC1h 35m
2026-06-24 OXF3571 - Jun 24, 16:40 UTCJun 24, 18:15 UTC1h 35m
2026-06-24 OXF3571 - Jun 24, 14:20 UTCJun 24, 14:45 UTC25m
2026-06-24 OXF3571 MSC → MSC Jun 24, 12:54 UTCJun 24, 13:44 UTC50m
2026-06-23 OXF3571 - Jun 23, 20:49 UTCJun 23, 22:29 UTC1h 40m
2026-06-23 OXF3571 - Jun 23, 17:44 UTCJun 23, 18:34 UTC50m
2026-06-23 OXF3571 - Jun 23, 16:09 UTCJun 23, 16:59 UTC50m
2026-06-23 OXF3571 - Jun 23, 14:25 UTCJun 23, 15:04 UTC40m

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 N4400F page for operator, model, and routing details .

Mode-S A54CFB frequently asked

What is Mode-S code A54CFB?
A54CFB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4400F.
Where is Mode-S A54CFB registered?
Mode-S code A54CFB 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 A54CFB broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54CFB, octal 51246373, decimal 10,833,147.
What flights does A54CFB operate?
Mode-S A54CFB has broadcast 1 distinct callsign, including OXF3571.