Apparatus

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sensors Mode-S transponder

A54D4B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4402R · CESSNA 172 Skyhawk · operated by AVEL AIRCRAFT INC

Hex
A54D4B
Octal
51246513
Decimal
10,833,227
Country
US
Tail
N4402R
Type
C172
No current signal · last broadcast 2d ago
Flights observed
180
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A54D4B.

Country allocation

The ICAO 24-bit address A54D4B 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
N4402R - 180 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 N4402R - Jul 11, 18:00 UTCJul 11, 18:45 UTC45m
2026-07-11 N4402R - Jul 11, 16:20 UTCJul 11, 16:35 UTC15m
2026-07-11 N4402R - Jul 11, 13:55 UTCJul 11, 15:10 UTC1h 15m
2026-07-10 N4402R - Jul 10, 16:00 UTCJul 10, 17:05 UTC1h 5m
2026-07-09 N4402R - Jul 9, 17:15 UTCJul 9, 17:45 UTC30m
2026-07-09 N4402R DPA → DPA Jul 9, 15:55 UTCJul 9, 16:20 UTC25m
2026-07-09 N4402R - Jul 9, 13:40 UTCJul 9, 14:40 UTC1h 0m
2026-07-09 N4402R - Jul 9, 11:30 UTCJul 9, 12:10 UTC40m
2026-07-08 N4402R - Jul 8, 21:15 UTCJul 8, 22:05 UTC50m
2026-07-08 N4402R - Jul 8, 20:15 UTCJul 8, 20:35 UTC20m
2026-07-08 N4402R - Jul 8, 18:20 UTCJul 8, 19:10 UTC50m
2026-07-08 N4402R - Jul 8, 16:20 UTCJul 8, 17:05 UTC45m
2026-07-08 N4402R - Jul 8, 14:00 UTCJul 8, 14:45 UTC45m
2026-07-07 N4402R - Jul 7, 23:50 UTCJul 8, 00:50 UTC1h 0m
2026-07-07 N4402R - Jul 7, 19:00 UTCJul 7, 20:40 UTC1h 40m
2026-07-07 N4402R - Jul 7, 10:05 UTCJul 7, 11:50 UTC1h 45m
2026-07-06 N4402R - Jul 6, 16:50 UTCJul 6, 17:50 UTC1h 0m
2026-07-02 N4402R DPA → DPA Jul 2, 20:50 UTCJul 2, 21:30 UTC40m
2026-07-01 N4402R - Jul 1, 20:15 UTCJul 1, 21:05 UTC50m
2026-07-01 N4402R - Jul 1, 16:50 UTCJul 1, 17:15 UTC25m
2026-07-01 N4402R - Jul 1, 12:30 UTCJul 1, 13:00 UTC30m
2026-06-30 N4402R - Jun 30, 15:35 UTCJun 30, 16:15 UTC40m
2026-06-29 N4402R - Jun 29, 00:29 UTCJun 29, 00:39 UTC10m
2026-06-28 N4402R - Jun 28, 16:19 UTCJun 28, 16:29 UTC10m
2026-06-26 N4402R DPA → DPA Jun 26, 22:29 UTCJun 26, 23:34 UTC1h 5m
2026-06-26 N4402R - Jun 26, 16:14 UTCJun 26, 16:30 UTC15m
2026-06-26 N4402R - Jun 26, 12:19 UTCJun 26, 13:40 UTC1h 20m
2026-06-25 N4402R - Jun 25, 20:14 UTCJun 25, 21:25 UTC1h 10m
2026-06-25 N4402R DPA → DPA Jun 25, 18:15 UTCJun 25, 19:05 UTC50m
2026-06-24 N4402R - Jun 24, 10:49 UTCJun 24, 11:54 UTC1h 5m
2026-06-23 N4402R - Jun 23, 22:55 UTCJun 23, 23:34 UTC40m
2026-06-23 N4402R - Jun 23, 20:40 UTCJun 23, 21:49 UTC1h 10m
2026-06-23 N4402R - Jun 23, 17:54 UTCJun 23, 19:04 UTC1h 10m
2026-06-23 N4402R DPA → DPA Jun 23, 16:24 UTCJun 23, 16:35 UTC10m
2026-06-22 N4402R - Jun 22, 15:45 UTCJun 22, 16:29 UTC45m
2026-06-21 N4402R - Jun 21, 11:34 UTCJun 21, 13:00 UTC1h 25m
2026-06-20 N4402R - Jun 20, 12:09 UTCJun 20, 13:09 UTC1h 0m
2026-06-20 N4402R - Jun 20, 11:14 UTCJun 20, 11:34 UTC20m
2026-06-19 N4402R - Jun 19, 18:44 UTCJun 19, 19:29 UTC45m
2026-06-19 N4402R DPA → DPA Jun 19, 14:54 UTCJun 19, 15:24 UTC30m
2026-06-19 N4402R - Jun 19, 11:20 UTCJun 19, 12:39 UTC1h 20m
2026-06-18 N4402R - Jun 18, 17:05 UTCJun 18, 17:45 UTC40m
2026-06-15 N4402R - Jun 15, 17:59 UTCJun 15, 18:35 UTC35m
2026-06-15 N4402R - Jun 15, 16:09 UTCJun 15, 16:19 UTC10m
2026-06-15 N4402R DPA → DPA Jun 15, 11:00 UTCJun 15, 12:25 UTC1h 25m
2026-06-14 N4402R - Jun 14, 23:50 UTCJun 15, 01:04 UTC1h 15m
2026-06-12 N4402R - Jun 12, 20:00 UTCJun 12, 21:45 UTC1h 45m
2026-06-12 N4402R - Jun 12, 15:40 UTCJun 12, 16:00 UTC20m
2026-06-12 N4402R - Jun 12, 14:25 UTCJun 12, 14:50 UTC25m
2026-06-12 N4402R - Jun 12, 13:10 UTCJun 12, 13:45 UTC35m

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 N4402R page for operator, model, and routing details .

Mode-S A54D4B frequently asked

What is Mode-S code A54D4B?
A54D4B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4402R.
Where is Mode-S A54D4B registered?
Mode-S code A54D4B 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 A54D4B broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54D4B, octal 51246513, decimal 10,833,227.
What flights does A54D4B operate?
Mode-S A54D4B has broadcast 1 distinct callsign, including N4402R.