Apparatus

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sensors Mode-S transponder

A4003D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N357QS · CESSNA 680 Citation Sovereign · operated by NETJETS SALES INC

Hex
A4003D
Octal
51000075
Decimal
10,747,965
Country
US
Tail
N357QS
Type
C680
No current signal · last broadcast 20h ago
Flights observed
100
Distinct callsigns
2
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S A4003D.

Country allocation

The ICAO 24-bit address A4003D 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
EJA357 NetJets 98 2026-05-29
N357QS - 2 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 EJA357 OPF → APF May 29, 13:15 UTCMay 29, 14:45 UTC1h 30m
2026-05-29 EJA357 OPF → APF May 29, 10:10 UTCMay 29, 11:25 UTC1h 15m
2026-05-28 EJA357 OPF → APF May 28, 19:45 UTCMay 28, 20:15 UTC30m
2026-05-28 EJA357 OPF → APF May 28, 17:00 UTCMay 28, 18:15 UTC1h 15m
2026-05-28 EJA357 OPF → APF May 28, 13:40 UTCMay 28, 15:50 UTC2h 10m
2026-05-27 EJA357 OPF → APF May 27, 22:55 UTCMay 27, 23:45 UTC50m
2026-05-27 EJA357 OPF → APF May 27, 21:10 UTCMay 27, 22:05 UTC55m
2026-05-27 EJA357 OPF → APF May 27, 18:05 UTCMay 27, 18:40 UTC35m
2026-05-27 EJA357 OPF → APF May 27, 14:15 UTCMay 27, 16:50 UTC2h 35m
2026-05-26 EJA357 OPF → APF May 26, 22:05 UTCMay 27, 00:34 UTC2h 30m
2026-05-26 EJA357 OPF → APF May 26, 15:39 UTCMay 26, 20:40 UTC5h 0m
2026-05-25 EJA357 OPF → APF May 25, 20:09 UTCMay 25, 20:40 UTC30m
2026-05-23 EJA357 OPF → APF May 23, 01:40 UTCMay 23, 03:00 UTC1h 19m
2026-05-22 EJA357 OPF → APF May 22, 23:15 UTCMay 23, 00:30 UTC1h 15m
2026-05-22 EJA357 OPF → APF May 22, 21:15 UTCMay 22, 21:55 UTC40m
2026-05-22 EJA357 OPF → APF May 22, 19:20 UTCMay 22, 20:20 UTC1h 0m
2026-05-22 EJA357 OPF → APF May 22, 16:35 UTCMay 22, 18:10 UTC1h 35m
2026-05-21 EJA357 OPF → APF May 21, 23:55 UTCMay 22, 00:20 UTC25m
2026-05-21 EJA357 OPF → APF May 21, 18:30 UTCMay 21, 22:50 UTC4h 20m
2026-05-21 EJA357 OPF → APF May 21, 15:10 UTCMay 21, 15:50 UTC40m
2026-05-20 EJA357 OPF → APF May 20, 23:05 UTCMay 20, 23:25 UTC20m
2026-05-20 EJA357 OPF → APF May 20, 21:25 UTCMay 20, 22:05 UTC40m
2026-05-20 EJA357 OPF → APF May 20, 18:05 UTCMay 20, 19:25 UTC1h 20m
2026-05-20 EJA357 OPF → APF May 20, 14:55 UTCMay 20, 15:55 UTC1h 0m
2026-05-20 EJA357 OPF → APF May 20, 13:20 UTCMay 20, 14:20 UTC1h 0m
2026-05-19 EJA357 OPF → APF May 19, 22:50 UTCMay 19, 23:10 UTC20m
2026-05-19 EJA357 OPF → APF May 19, 18:00 UTCMay 19, 22:00 UTC4h 0m
2026-05-19 EJA357 OPF → APF May 19, 15:50 UTCMay 19, 16:35 UTC45m
2026-05-19 EJA357 OPF → APF May 19, 14:05 UTCMay 19, 15:00 UTC55m
2026-05-18 EJA357 OPF → APF May 18, 21:05 UTCMay 18, 23:05 UTC2h 0m
2026-05-18 EJA357 OPF → APF May 18, 18:50 UTCMay 18, 20:25 UTC1h 35m
2026-05-18 EJA357 OPF → APF May 18, 16:55 UTCMay 18, 17:10 UTC15m
2026-05-18 EJA357 OPF → APF May 18, 16:00 UTCMay 18, 16:40 UTC40m
2026-05-18 EJA357 OPF → APF May 18, 13:05 UTCMay 18, 13:35 UTC30m
2026-05-17 EJA357 OPF → APF May 17, 19:40 UTCMay 17, 21:30 UTC1h 50m
2026-05-17 EJA357 OPF → APF May 17, 16:01 UTCMay 17, 17:55 UTC1h 55m
2026-05-16 EJA357 OPF → APF May 16, 19:20 UTCMay 16, 21:20 UTC2h 0m
2026-05-16 EJA357 OPF → APF May 16, 16:10 UTCMay 16, 17:01 UTC50m
2026-05-16 EJA357 OPF → APF May 16, 14:16 UTCMay 16, 15:16 UTC1h 0m
2026-05-15 EJA357 OPF → APF May 15, 18:20 UTCMay 15, 19:55 UTC1h 35m
2026-05-15 EJA357 OPF → APF May 15, 13:50 UTCMay 15, 15:45 UTC1h 54m
2026-05-14 EJA357 OPF → APF May 14, 22:05 UTCMay 15, 00:05 UTC2h 0m
2026-05-14 EJA357 OPF → APF May 14, 17:55 UTCMay 14, 21:25 UTC3h 30m
2026-05-14 EJA357 OPF → APF May 14, 15:01 UTCMay 14, 17:05 UTC2h 5m
2026-05-11 EJA357 OPF → APF May 11, 14:20 UTCMay 11, 16:20 UTC2h 0m
2026-05-06 EJA357 OPF → APF May 6, 18:20 UTCMay 6, 18:45 UTC25m
2026-05-06 EJA357 OPF → APF May 6, 16:20 UTCMay 6, 18:15 UTC1h 55m
2026-05-06 EJA357 OPF → APF May 6, 13:15 UTCMay 6, 13:55 UTC40m
2026-05-06 EJA357 OPF → APF May 6, 12:10 UTCMay 6, 12:40 UTC30m
2026-05-05 EJA357 OPF → APF May 5, 20:35 UTCMay 5, 21:20 UTC45m

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 N357QS page for operator, model, and routing details .

Mode-S A4003D frequently asked

What is Mode-S code A4003D?
A4003D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N357QS.
Where is Mode-S A4003D registered?
Mode-S code A4003D 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 A4003D 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 A4003D, octal 51000075, decimal 10,747,965.
What flights does A4003D operate?
Mode-S A4003D has broadcast 2 distinct callsigns, including EJA357, N357QS.