Apparatus

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sensors Mode-S transponder

A5879C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4554J · AMERICAN AA-5 Tiger · operated by JULIETTE BRAVO AVIATION LLC

Hex
A5879C
Octal
51303634
Decimal
10,848,156
Country
US
Tail
N4554J
Type
AA5
No current signal · last broadcast 23h ago
Flights observed
87
Distinct callsigns
1
Country
US
Last broadcast
23h ago

Last known position

Most recent position reported by Mode-S A5879C.

Country allocation

The ICAO 24-bit address A5879C 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
N4554J - 87 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N4554J - Jul 13, 21:25 UTCJul 13, 21:55 UTC30m
2026-07-13 N4554J - Jul 13, 21:00 UTCJul 13, 21:20 UTC20m
2026-07-13 N4554J - Jul 13, 14:20 UTCJul 13, 16:20 UTC2h 0m
2026-07-12 N4554J - Jul 12, 19:55 UTCJul 12, 20:50 UTC55m
2026-07-12 N4554J - Jul 12, 18:50 UTCJul 12, 19:01 UTC10m
2026-07-12 N4554J - Jul 12, 18:25 UTCJul 12, 18:35 UTC10m
2026-07-12 N4554J PTW → RDG Jul 12, 18:05 UTCJul 12, 18:20 UTC15m
2026-07-10 N4554J PTW → PTW Jul 10, 15:45 UTCJul 10, 17:40 UTC1h 55m
2026-07-08 N4554J - Jul 8, 23:20 UTCJul 9, 00:30 UTC1h 10m
2026-07-07 N4554J - Jul 7, 20:15 UTCJul 7, 21:05 UTC50m
2026-07-07 N4554J - Jul 7, 18:55 UTCJul 7, 19:45 UTC50m
2026-07-01 N4554J ABE → PTW Jul 1, 16:40 UTCJul 1, 17:10 UTC30m
2026-07-01 N4554J - Jul 1, 16:05 UTCJul 1, 16:35 UTC30m
2026-06-30 N4554J - Jun 30, 19:20 UTCJun 30, 20:20 UTC1h 0m
2026-06-30 N4554J - Jun 30, 14:20 UTCJun 30, 15:10 UTC50m
2026-06-29 N4554J - Jun 29, 22:05 UTCJun 29, 22:59 UTC55m
2026-06-29 N4554J - Jun 29, 14:50 UTCJun 29, 15:49 UTC1h 0m
2026-06-26 N4554J - Jun 26, 16:49 UTCJun 26, 17:40 UTC50m
2026-06-25 N4554J - Jun 25, 00:19 UTCJun 25, 01:44 UTC1h 25m
2026-06-24 N4554J - Jun 24, 18:39 UTCJun 24, 20:05 UTC1h 25m
2026-06-21 N4554J - Jun 21, 20:29 UTCJun 21, 21:29 UTC1h 0m
2026-06-21 N4554J - Jun 21, 14:34 UTCJun 21, 14:54 UTC20m
2026-06-21 N4554J - Jun 21, 12:49 UTCJun 21, 13:09 UTC20m
2026-06-20 N4554J - Jun 20, 13:14 UTCJun 20, 15:14 UTC2h 0m
2026-06-19 N4554J - Jun 19, 20:09 UTCJun 19, 21:19 UTC1h 10m
2026-06-19 N4554J - Jun 19, 17:39 UTCJun 19, 18:25 UTC45m
2026-06-18 N4554J - Jun 18, 02:45 UTCJun 18, 04:20 UTC1h 35m
2026-06-16 N4554J - Jun 16, 16:35 UTCJun 16, 17:10 UTC35m
2026-06-16 N4554J - Jun 16, 14:15 UTCJun 16, 14:45 UTC30m
2026-06-14 N4554J - Jun 14, 15:20 UTCJun 14, 15:55 UTC35m
2026-06-14 N4554J - Jun 14, 14:25 UTCJun 14, 15:15 UTC50m
2026-06-14 N4554J - Jun 14, 13:10 UTCJun 14, 13:35 UTC25m
2026-06-14 N4554J - Jun 14, 12:40 UTCJun 14, 13:00 UTC20m
2026-06-13 N4554J - Jun 13, 22:20 UTCJun 13, 23:05 UTC45m
2026-06-13 N4554J - Jun 13, 13:20 UTCJun 13, 14:15 UTC55m
2026-06-12 N4554J - Jun 12, 14:30 UTCJun 12, 14:45 UTC15m
2026-06-12 N4554J - Jun 12, 13:40 UTCJun 12, 14:15 UTC35m
2026-06-08 N4554J - Jun 8, 19:10 UTCJun 8, 20:05 UTC55m
2026-06-07 N4554J - Jun 7, 16:40 UTCJun 7, 18:30 UTC1h 50m
2026-06-06 N4554J - Jun 6, 16:20 UTCJun 6, 18:09 UTC1h 50m
2026-06-05 N4554J - Jun 5, 18:35 UTCJun 5, 18:55 UTC20m
2026-06-05 N4554J - Jun 5, 18:00 UTCJun 5, 18:25 UTC25m
2026-06-05 N4554J - Jun 5, 15:45 UTCJun 5, 16:55 UTC1h 10m
2026-06-04 N4554J - Jun 4, 19:10 UTCJun 4, 20:25 UTC1h 15m
2026-06-04 N4554J - Jun 4, 16:40 UTCJun 4, 18:00 UTC1h 20m
2026-05-31 N4554J - May 31, 16:55 UTCMay 31, 18:25 UTC1h 30m
2026-05-29 N4554J - May 29, 22:15 UTCMay 29, 22:40 UTC25m
2026-05-22 N4554J - May 22, 19:35 UTCMay 22, 20:25 UTC50m
2026-05-22 N4554J - May 22, 18:20 UTCMay 22, 19:00 UTC40m
2026-05-21 N4554J - May 21, 18:55 UTCMay 21, 20:40 UTC1h 45m

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 N4554J page for operator, model, and routing details .

Mode-S A5879C frequently asked

What is Mode-S code A5879C?
A5879C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4554J.
Where is Mode-S A5879C registered?
Mode-S code A5879C 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 A5879C broadcasting right now?
No active broadcast right now. Last signal was 23h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5879C, octal 51303634, decimal 10,848,156.
What flights does A5879C operate?
Mode-S A5879C has broadcast 1 distinct callsign, including N4554J.