Apparatus

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sensors Mode-S transponder

A4A1F0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N398QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, GPB PARTNERS INC, LUPIN INC, WILSON PETER A

Hex
A4A1F0
Octal
51120760
Decimal
10,789,360
Country
US
Tail
N398QS
Type
E55P
No current signal · last broadcast 3h ago
Flights observed
108
Distinct callsigns
2
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A4A1F0.

Country allocation

The ICAO 24-bit address A4A1F0 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
EJA398 NetJets 104 2026-05-29
N398QS - 4 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 EJA398 APF → MHH May 29, 23:35 UTCMay 30, 01:35 UTC2h 0m
2026-05-29 EJA398 APF → MHH May 29, 20:00 UTCMay 29, 21:25 UTC1h 25m
2026-05-29 EJA398 APF → MHH May 29, 17:45 UTCMay 29, 18:40 UTC55m
2026-05-29 EJA398 APF → MHH May 29, 16:20 UTCMay 29, 17:00 UTC40m
2026-05-29 EJA398 APF → MHH May 29, 14:30 UTCMay 29, 14:50 UTC20m
2026-05-29 EJA398 APF → MHH May 29, 01:15 UTCMay 29, 01:45 UTC30m
2026-05-28 EJA398 APF → MHH May 28, 18:00 UTCMay 28, 20:30 UTC2h 30m
2026-05-28 EJA398 APF → MHH May 28, 16:25 UTCMay 28, 17:00 UTC35m
2026-05-28 N398QS - May 28, 14:55 UTCMay 28, 15:40 UTC45m
2026-05-28 N398QS - May 28, 12:20 UTCMay 28, 12:40 UTC20m
2026-05-18 EJA398 APF → MHH May 18, 20:40 UTCMay 18, 22:50 UTC2h 10m
2026-05-18 EJA398 APF → MHH May 18, 16:50 UTCMay 18, 18:30 UTC1h 39m
2026-05-18 EJA398 APF → MHH May 18, 15:15 UTCMay 18, 15:45 UTC30m
2026-05-18 EJA398 APF → MHH May 18, 14:55 UTCMay 18, 15:10 UTC15m
2026-05-18 EJA398 APF → MHH May 18, 13:15 UTCMay 18, 14:10 UTC55m
2026-05-17 EJA398 APF → MHH May 17, 22:25 UTCMay 17, 23:25 UTC1h 0m
2026-05-17 EJA398 APF → MHH May 17, 20:30 UTCMay 17, 20:55 UTC25m
2026-05-17 EJA398 APF → MHH May 17, 18:10 UTCMay 17, 18:50 UTC40m
2026-05-17 EJA398 APF → MHH May 17, 15:55 UTCMay 17, 16:35 UTC40m
2026-05-17 EJA398 APF → MHH May 17, 14:15 UTCMay 17, 14:45 UTC30m
2026-05-16 EJA398 APF → MHH May 16, 19:20 UTCMay 16, 20:10 UTC50m
2026-05-16 EJA398 APF → MHH May 16, 15:45 UTCMay 16, 17:40 UTC1h 55m
2026-05-16 EJA398 APF → MHH May 16, 14:01 UTCMay 16, 14:51 UTC50m
2026-05-16 EJA398 APF → MHH May 16, 01:00 UTCMay 16, 01:30 UTC30m
2026-05-15 EJA398 APF → MHH May 15, 21:10 UTCMay 15, 21:50 UTC40m
2026-05-15 EJA398 APF → MHH May 15, 19:05 UTCMay 15, 19:40 UTC35m
2026-05-15 EJA398 APF → MHH May 15, 17:25 UTCMay 15, 18:05 UTC40m
2026-05-15 EJA398 APF → MHH May 15, 14:10 UTCMay 15, 16:15 UTC2h 4m
2026-05-14 EJA398 APF → MHH May 14, 21:55 UTCMay 14, 22:30 UTC35m
2026-05-14 EJA398 APF → MHH May 14, 20:10 UTCMay 14, 21:20 UTC1h 10m
2026-05-14 EJA398 APF → MHH May 14, 17:50 UTCMay 14, 18:40 UTC50m
2026-05-14 EJA398 APF → MHH May 14, 14:55 UTCMay 14, 17:05 UTC2h 10m
2026-05-14 EJA398 APF → MHH May 14, 13:55 UTCMay 14, 14:15 UTC20m
2026-05-13 EJA398 APF → MHH May 13, 23:40 UTCMay 13, 23:55 UTC15m
2026-05-13 EJA398 APF → MHH May 13, 19:45 UTCMay 13, 22:50 UTC3h 5m
2026-05-13 EJA398 APF → MHH May 13, 15:40 UTCMay 13, 17:45 UTC2h 5m
2026-05-13 EJA398 APF → MHH May 13, 12:10 UTCMay 13, 14:20 UTC2h 10m
2026-05-12 EJA398 APF → MHH May 12, 21:30 UTCMay 13, 00:10 UTC2h 40m
2026-05-12 EJA398 APF → MHH May 12, 19:00 UTCMay 12, 19:40 UTC40m
2026-05-11 EJA398 APF → MHH May 11, 15:35 UTCMay 11, 16:25 UTC50m
2026-05-10 EJA398 APF → MHH May 10, 20:00 UTCMay 10, 22:05 UTC2h 5m
2026-05-10 EJA398 APF → MHH May 10, 15:09 UTCMay 10, 16:40 UTC1h 30m
2026-05-10 EJA398 APF → MHH May 10, 13:25 UTCMay 10, 14:25 UTC1h 0m
2026-05-10 EJA398 APF → MHH May 10, 12:15 UTCMay 10, 12:49 UTC35m
2026-05-09 EJA398 APF → MHH May 9, 19:55 UTCMay 9, 20:30 UTC35m
2026-05-07 EJA398 CLT → TYS May 7, 22:30 UTCMay 7, 22:50 UTC20m
2026-05-07 EJA398 CLT → TYS May 7, 21:20 UTCMay 7, 21:55 UTC35m
2026-05-07 EJA398 CLT → TYS May 7, 18:15 UTCMay 7, 19:30 UTC1h 15m
2026-05-07 EJA398 CLT → TYS May 7, 12:15 UTCMay 7, 14:00 UTC1h 45m
2026-05-06 EJA398 CLT → TYS May 6, 20:55 UTCMay 6, 23:15 UTC2h 20m

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 N398QS page for operator, model, and routing details .

Mode-S A4A1F0 frequently asked

What is Mode-S code A4A1F0?
A4A1F0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N398QS.
Where is Mode-S A4A1F0 registered?
Mode-S code A4A1F0 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 A4A1F0 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4A1F0, octal 51120760, decimal 10,789,360.
What flights does A4A1F0 operate?
Mode-S A4A1F0 has broadcast 2 distinct callsigns, including EJA398, N398QS.