Apparatus

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sensors Mode-S transponder

A1A24E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N204QS · BOMBARDIER CL-600 Challenger · operated by NETJETS SALES INC

Hex
A1A24E
Octal
50321116
Decimal
10,592,846
Country
US
Tail
N204QS
Type
CL60
No current signal · last broadcast 2d ago
Flights observed
145
Distinct callsigns
2
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A1A24E.

Country allocation

The ICAO 24-bit address A1A24E 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 2 distinct

Callsign Airline Flights Last seen
EJA204 NetJets 122 2026-07-21
N204QS - 23 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 EJA204 CMH → TVC Jul 21, 21:40 UTCJul 21, 23:10 UTC1h 30m
2026-07-21 EJA204 CMH → TVC Jul 21, 18:10 UTCJul 21, 19:15 UTC1h 5m
2026-07-21 EJA204 CMH → TVC Jul 21, 15:50 UTCJul 21, 16:50 UTC1h 0m
2026-07-20 EJA204 CMH → TVC Jul 20, 19:25 UTCJul 20, 21:40 UTC2h 15m
2026-07-20 EJA204 CMH → TVC Jul 20, 16:35 UTCJul 20, 18:30 UTC1h 55m
2026-07-20 EJA204 CMH → TVC Jul 20, 01:55 UTCJul 20, 02:05 UTC10m
2026-07-20 EJA204 CMH → TVC Jul 20, 00:35 UTCJul 20, 01:15 UTC40m
2026-07-19 EJA204 CMH → TVC Jul 19, 21:05 UTCJul 19, 22:15 UTC1h 10m
2026-07-19 EJA204 CMH → TVC Jul 19, 19:10 UTCJul 19, 20:10 UTC1h 0m
2026-07-19 EJA204 - Jul 19, 02:45 UTCJul 19, 03:30 UTC45m
2026-07-18 EJA204 - Jul 18, 21:15 UTCJul 18, 22:05 UTC50m
2026-07-18 EJA204 - Jul 18, 19:00 UTCJul 18, 19:45 UTC45m
2026-07-17 EJA204 BJC → SAN Jul 17, 22:49 UTCJul 18, 00:39 UTC1h 50m
2026-07-17 EJA204 - Jul 17, 19:15 UTCJul 17, 20:25 UTC1h 10m
2026-07-17 EJA204 - Jul 17, 16:10 UTCJul 17, 17:35 UTC1h 25m
2026-07-16 EJA204 AUS → DAL Jul 16, 23:59 UTCJul 17, 00:45 UTC45m
2026-07-16 EJA204 - Jul 16, 15:40 UTCJul 16, 17:25 UTC1h 45m
2026-07-15 EJA204 - Jul 15, 14:20 UTCJul 15, 20:50 UTC6h 30m
2026-07-14 EJA204 IAD → TEB Jul 14, 20:45 UTCJul 14, 21:35 UTC50m
2026-07-13 EJA204 - Jul 13, 21:35 UTCJul 13, 22:10 UTC35m
2026-07-13 EJA204 - Jul 13, 19:20 UTCJul 13, 20:05 UTC45m
2026-07-13 EJA204 - Jul 13, 15:55 UTCJul 13, 16:40 UTC45m
2026-07-12 EJA204 - Jul 12, 18:45 UTCJul 12, 22:00 UTC3h 15m
2026-07-08 EJA204 - Jul 8, 17:55 UTCJul 8, 18:35 UTC40m
2026-07-08 EJA204 - Jul 8, 15:15 UTCJul 8, 17:05 UTC1h 50m
2026-07-07 EJA204 - Jul 7, 06:00 UTCJul 7, 10:55 UTC4h 55m
2026-07-06 EJA204 SEA → BFI Jul 6, 01:25 UTCJul 6, 01:35 UTC10m
2026-07-05 EJA204 - Jul 5, 20:10 UTCJul 6, 00:45 UTC4h 35m
2026-07-04 EJA204 - Jul 4, 19:00 UTCJul 4, 20:40 UTC1h 40m
2026-07-04 EJA204 - Jul 4, 13:55 UTCJul 4, 16:15 UTC2h 20m
2026-07-03 EJA204 - Jul 3, 18:35 UTCJul 3, 19:15 UTC40m
2026-06-30 N204QS - Jun 30, 14:35 UTCJun 30, 18:05 UTC3h 30m
2026-06-29 N204QS - Jun 29, 00:14 UTCJun 29, 04:00 UTC3h 45m
2026-06-25 N204QS - Jun 25, 16:55 UTCJun 25, 23:49 UTC6h 55m
2026-06-25 N204QS - Jun 25, 13:59 UTCJun 25, 15:50 UTC1h 50m
2026-06-24 N204QS - Jun 24, 11:09 UTCJun 24, 13:05 UTC1h 55m
2026-06-22 N204QS - Jun 22, 01:35 UTCJun 22, 07:04 UTC5h 30m
2026-06-21 EJA204 - Jun 21, 13:00 UTCJun 21, 22:49 UTC9h 50m
2026-06-21 N204QS - Jun 21, 10:34 UTCJun 21, 10:49 UTC15m
2026-06-19 N204QS BGR → GVA Jun 19, 22:30 UTCJun 20, 04:49 UTC6h 20m
2026-06-19 EJA204 - Jun 19, 18:20 UTCJun 19, 21:30 UTC3h 10m
2026-06-18 EJA204 - Jun 18, 03:05 UTCJun 18, 04:40 UTC1h 35m
2026-06-17 EJA204 BUR → AMW Jun 17, 23:20 UTCJun 18, 02:10 UTC2h 50m
2026-06-17 EJA204 - Jun 17, 21:10 UTCJun 17, 22:00 UTC50m
2026-06-16 N204QS - Jun 16, 23:05 UTCJun 17, 03:55 UTC4h 50m
2026-06-16 N204QS KOA → HNL Jun 16, 20:15 UTCJun 16, 20:50 UTC35m
2026-06-15 N204QS - Jun 15, 23:45 UTCJun 16, 00:05 UTC20m
2026-06-15 N204QS - Jun 15, 19:14 UTCJun 15, 19:55 UTC40m
2026-06-15 EJA204 CLD → SJC Jun 15, 13:10 UTCJun 15, 14:05 UTC55m
2026-06-14 EJA204 - Jun 14, 21:25 UTCJun 14, 22:15 UTC50m

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 N204QS page for operator, model, and routing details .

Mode-S A1A24E frequently asked

What is Mode-S code A1A24E?
A1A24E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N204QS.
Where is Mode-S A1A24E registered?
Mode-S code A1A24E 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 A1A24E 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 A1A24E, octal 50321116, decimal 10,592,846.
What flights does A1A24E operate?
Mode-S A1A24E has broadcast 2 distinct callsigns, including EJA204, N204QS.