Apparatus

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sensors Mode-S transponder

A1E54B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N221FX · BOMBARDIER BD-100 Challenger 350

Hex
A1E54B
Octal
50362513
Decimal
10,609,995
Country
US
Tail
N221FX
Type
CL35
No current signal · last broadcast 2d ago
Flights observed
171
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A1E54B.

Country allocation

The ICAO 24-bit address A1E54B 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
LXJ221 - 171 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 LXJ221 - Jul 11, 12:45 UTCJul 11, 13:20 UTC35m
2026-07-11 LXJ221 - Jul 11, 10:25 UTCJul 11, 11:40 UTC1h 15m
2026-07-10 LXJ221 - Jul 10, 13:30 UTCJul 10, 14:45 UTC1h 15m
2026-07-10 LXJ221 - Jul 10, 08:20 UTCJul 10, 09:50 UTC1h 30m
2026-07-10 LXJ221 - Jul 10, 04:35 UTCJul 10, 06:25 UTC1h 50m
2026-07-09 LXJ221 - Jul 9, 14:40 UTCJul 9, 15:30 UTC50m
2026-07-09 LXJ221 - Jul 9, 11:35 UTCJul 9, 13:15 UTC1h 40m
2026-07-09 LXJ221 - Jul 9, 05:50 UTCJul 9, 07:10 UTC1h 20m
2026-07-08 LXJ221 NCE → LIN Jul 8, 11:25 UTCJul 8, 12:00 UTC35m
2026-07-08 LXJ221 - Jul 8, 09:05 UTCJul 8, 10:10 UTC1h 5m
2026-07-07 LXJ221 - Jul 7, 11:25 UTCJul 7, 12:05 UTC40m
2026-07-07 LXJ221 SKG → GRS Jul 7, 08:40 UTCJul 7, 10:10 UTC1h 30m
2026-07-06 LXJ221 - Jul 6, 19:25 UTCJul 6, 20:20 UTC55m
2026-07-06 LXJ221 - Jul 6, 15:20 UTCJul 6, 17:25 UTC2h 5m
2026-07-06 LXJ221 ZRH → FLR Jul 6, 13:20 UTCJul 6, 14:05 UTC45m
2026-07-05 LXJ221 - Jul 5, 08:05 UTCJul 5, 09:05 UTC1h 0m
2026-07-04 LXJ221 - Jul 4, 16:05 UTCJul 4, 16:45 UTC40m
2026-07-04 LXJ221 - Jul 4, 13:45 UTCJul 4, 15:15 UTC1h 30m
2026-07-04 LXJ221 - Jul 4, 12:20 UTCJul 4, 12:30 UTC10m
2026-07-04 LXJ221 - Jul 4, 10:30 UTCJul 4, 10:45 UTC15m
2026-07-04 LXJ221 - Jul 4, 07:05 UTCJul 4, 08:50 UTC1h 45m
2026-07-03 LXJ221 IBZ → LTN Jul 3, 10:05 UTCJul 3, 12:15 UTC2h 10m
2026-07-03 LXJ221 LIN → IBZ Jul 3, 06:00 UTCJul 3, 07:25 UTC1h 25m
2026-07-02 LXJ221 - Jul 2, 19:15 UTCJul 2, 20:00 UTC45m
2026-07-02 LXJ221 - Jul 2, 17:15 UTCJul 2, 18:00 UTC45m
2026-07-02 LXJ221 - Jul 2, 14:05 UTCJul 2, 15:20 UTC1h 15m
2026-07-02 LXJ221 - Jul 2, 11:30 UTCJul 2, 13:10 UTC1h 40m
2026-07-02 LXJ221 - Jul 2, 09:35 UTCJul 2, 10:05 UTC30m
2026-07-01 LXJ221 MAD → FAB Jul 1, 17:00 UTCJul 1, 19:05 UTC2h 5m
2026-07-01 LXJ221 - Jul 1, 07:50 UTCJul 1, 09:40 UTC1h 50m
2026-06-30 LXJ221 MXP → FAB Jun 30, 15:40 UTCJun 30, 17:25 UTC1h 45m
2026-06-30 LXJ221 - Jun 30, 11:55 UTCJun 30, 12:20 UTC25m
2026-06-30 LXJ221 - Jun 30, 09:20 UTCJun 30, 10:25 UTC1h 5m
2026-06-30 LXJ221 ANR → LBG Jun 30, 06:05 UTCJun 30, 06:55 UTC50m
2026-06-29 LXJ221 IBZ → ANR Jun 29, 13:04 UTCJun 29, 15:00 UTC1h 55m
2026-06-29 LXJ221 GRQ → IBZ Jun 29, 07:15 UTCJun 29, 09:40 UTC2h 25m
2026-06-28 LXJ221 - Jun 28, 13:00 UTCJun 28, 13:34 UTC35m
2026-06-28 LXJ221 - Jun 28, 10:50 UTCJun 28, 11:59 UTC1h 10m
2026-06-28 LXJ221 BRN → BHX Jun 28, 07:44 UTCJun 28, 09:10 UTC1h 25m
2026-06-27 LXJ221 ANR → BRN Jun 27, 10:45 UTCJun 27, 11:35 UTC50m
2026-06-27 LXJ221 - Jun 27, 07:49 UTCJun 27, 09:50 UTC2h 0m
2026-06-27 LXJ221 - Jun 27, 05:49 UTCJun 27, 06:40 UTC50m
2026-06-26 LXJ221 - Jun 26, 11:30 UTCJun 26, 13:34 UTC2h 5m
2026-06-26 LXJ221 RTM → EXT Jun 26, 09:05 UTCJun 26, 09:59 UTC55m
2026-06-26 LXJ221 LIN → RTM Jun 26, 06:19 UTCJun 26, 07:30 UTC1h 10m
2026-06-22 LXJ221 OXF → LIN Jun 22, 17:15 UTCJun 22, 18:49 UTC1h 35m
2026-06-22 LXJ221 GRQ → OXF Jun 22, 12:59 UTCJun 22, 13:59 UTC1h 0m
2026-06-22 LXJ221 - Jun 22, 11:00 UTCJun 22, 12:00 UTC1h 0m
2026-06-21 LXJ221 MAN → FAB Jun 21, 15:40 UTCJun 21, 16:14 UTC35m
2026-06-21 LXJ221 - Jun 21, 11:10 UTCJun 21, 13:59 UTC2h 50m

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 N221FX page for operator, model, and routing details .

Mode-S A1E54B frequently asked

What is Mode-S code A1E54B?
A1E54B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N221FX.
Where is Mode-S A1E54B registered?
Mode-S code A1E54B 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 A1E54B 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 A1E54B, octal 50362513, decimal 10,609,995.
What flights does A1E54B operate?
Mode-S A1E54B has broadcast 1 distinct callsign, including LXJ221.