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 20h ago
Flights observed
60
Distinct callsigns
2
Country
US
Last broadcast
20h 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 52 2026-05-30
N204QS - 8 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 EJA204 CMH → TVC May 30, 00:05 UTCMay 30, 00:25 UTC20m
2026-05-29 EJA204 CMH → TVC May 29, 21:40 UTCMay 29, 23:15 UTC1h 35m
2026-05-29 EJA204 CMH → TVC May 29, 19:15 UTCMay 29, 20:40 UTC1h 25m
2026-05-29 EJA204 CMH → TVC May 29, 16:55 UTCMay 29, 18:00 UTC1h 5m
2026-05-29 EJA204 CMH → TVC May 29, 15:10 UTCMay 29, 15:35 UTC25m
2026-05-28 EJA204 CMH → TVC May 28, 19:10 UTCMay 28, 21:35 UTC2h 25m
2026-05-28 N204QS - May 28, 17:15 UTCMay 28, 17:50 UTC35m
2026-05-28 N204QS - May 28, 14:35 UTCMay 28, 14:55 UTC20m
2026-05-27 EJA204 CMH → TVC May 27, 21:45 UTCMay 27, 22:00 UTC15m
2026-05-27 EJA204 CMH → TVC May 27, 18:15 UTCMay 27, 20:45 UTC2h 30m
2026-05-26 EJA204 CMH → TVC May 26, 19:55 UTCMay 26, 20:15 UTC20m
2026-05-26 EJA204 CMH → TVC May 26, 03:09 UTCMay 26, 04:04 UTC55m
2026-05-25 EJA204 CMH → TVC May 25, 21:24 UTCMay 25, 23:00 UTC1h 35m
2026-05-25 EJA204 CMH → TVC May 25, 18:20 UTCMay 25, 19:10 UTC50m
2026-05-25 EJA204 CMH → TVC May 25, 16:30 UTCMay 25, 17:10 UTC40m
2026-05-25 EJA204 CMH → TVC May 25, 13:50 UTCMay 25, 14:55 UTC1h 5m
2026-05-24 N204QS - May 24, 15:55 UTCMay 24, 19:25 UTC3h 30m
2026-05-24 N204QS - May 24, 15:20 UTCMay 24, 15:25 UTC5m
2026-05-24 N204QS - May 24, 12:05 UTCMay 24, 13:10 UTC1h 5m
2026-05-23 N204QS - May 23, 19:45 UTCMay 23, 21:05 UTC1h 20m
2026-05-23 EJA204 CMH → TVC May 23, 16:20 UTCMay 23, 18:45 UTC2h 26m
2026-05-22 EJA204 CMH → TVC May 22, 11:50 UTCMay 22, 14:20 UTC2h 30m
2026-05-21 EJA204 CMH → TVC May 21, 21:15 UTCMay 21, 21:45 UTC30m
2026-05-21 EJA204 CMH → TVC May 21, 18:20 UTCMay 21, 20:20 UTC2h 0m
2026-05-21 EJA204 CMH → TVC May 21, 14:20 UTCMay 21, 15:15 UTC55m
2026-05-20 EJA204 CMH → TVC May 20, 23:10 UTCMay 21, 00:25 UTC1h 15m
2026-05-20 EJA204 CMH → TVC May 20, 19:10 UTCMay 20, 21:10 UTC2h 0m
2026-05-20 EJA204 CMH → TVC May 20, 17:25 UTCMay 20, 17:40 UTC15m
2026-05-20 EJA204 CMH → TVC May 20, 02:00 UTCMay 20, 02:30 UTC30m
2026-05-19 EJA204 CMH → TVC May 19, 23:55 UTCMay 20, 01:15 UTC1h 20m
2026-05-19 EJA204 CMH → TVC May 19, 21:10 UTCMay 19, 22:20 UTC1h 10m
2026-05-19 EJA204 CMH → TVC May 19, 17:30 UTCMay 19, 19:15 UTC1h 45m
2026-05-19 EJA204 CMH → TVC May 19, 00:05 UTCMay 19, 00:55 UTC50m
2026-05-18 EJA204 CMH → TVC May 18, 17:35 UTCMay 18, 22:30 UTC4h 54m
2026-05-17 EJA204 CMH → TVC May 17, 21:45 UTCMay 18, 00:15 UTC2h 30m
2026-05-17 EJA204 CMH → TVC May 17, 19:30 UTCMay 17, 20:30 UTC1h 0m
2026-05-17 EJA204 CMH → TVC May 17, 17:40 UTCMay 17, 18:15 UTC35m
2026-05-16 EJA204 CMH → TVC May 16, 18:10 UTCMay 16, 23:40 UTC5h 30m
2026-05-16 EJA204 CMH → TVC May 16, 16:00 UTCMay 16, 16:40 UTC40m
2026-05-13 EJA204 CMH → TVC May 13, 18:50 UTCMay 13, 22:00 UTC3h 10m
2026-05-12 EJA204 CMH → TVC May 12, 23:15 UTCMay 13, 02:55 UTC3h 40m
2026-05-12 EJA204 CMH → TVC May 12, 19:50 UTCMay 12, 22:05 UTC2h 15m
2026-05-12 EJA204 CMH → TVC May 12, 15:45 UTCMay 12, 18:35 UTC2h 50m
2026-05-12 N204QS - May 12, 13:35 UTCMay 12, 14:25 UTC50m
2026-05-11 N204QS - May 11, 19:00 UTCMay 11, 19:25 UTC25m
2026-05-11 EJA204 CMH → TVC May 11, 14:45 UTCMay 11, 15:35 UTC50m
2026-05-11 EJA204 CMH → TVC May 11, 12:10 UTCMay 11, 13:40 UTC1h 30m
2026-05-10 EJA204 CMH → TVC May 10, 21:40 UTCMay 10, 22:20 UTC40m
2026-05-10 EJA204 CMH → TVC May 10, 18:39 UTCMay 10, 20:35 UTC1h 55m
2026-05-10 EJA204 CMH → TVC May 10, 14:54 UTCMay 10, 15:55 UTC1h 0m

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 20h 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.