Apparatus

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sensors Mode-S transponder

A4BCEC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N404QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, NEVADA JET LTD TRUSTEE, BOMATIC LLC, BRANTLEY DAVID JR, BUNGE MANAGEMENT SERVICES INC, PUNKINAIR INC

Hex
A4BCEC
Octal
51136354
Decimal
10,796,268
Country
US
Tail
N404QS
Type
E55P
No current signal · last broadcast 4h ago
Flights observed
133
Distinct callsigns
2
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A4BCEC.

Country allocation

The ICAO 24-bit address A4BCEC 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
EJA404 NetJets 125 2026-06-02
N404QS - 8 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 EJA404 SCF → BFI Jun 2, 20:30 UTCJun 2, 21:00 UTC30m
2026-06-02 EJA404 SCF → BFI Jun 2, 17:45 UTCJun 2, 19:30 UTC1h 45m
2026-06-02 EJA404 SCF → BFI Jun 2, 12:25 UTCJun 2, 13:40 UTC1h 15m
2026-06-02 EJA404 SCF → BFI Jun 2, 00:10 UTCJun 2, 00:20 UTC10m
2026-06-01 EJA404 SCF → BFI Jun 1, 21:50 UTCJun 1, 22:25 UTC35m
2026-06-01 EJA404 SCF → BFI Jun 1, 17:05 UTCJun 1, 17:40 UTC35m
2026-06-01 EJA404 SCF → BFI Jun 1, 15:10 UTCJun 1, 15:55 UTC45m
2026-05-31 EJA404 SCF → BFI May 31, 21:35 UTCMay 31, 22:35 UTC1h 0m
2026-05-31 EJA404 SCF → BFI May 31, 19:20 UTCMay 31, 21:00 UTC1h 40m
2026-05-31 EJA404 SCF → BFI May 31, 16:40 UTCMay 31, 17:05 UTC25m
2026-05-31 EJA404 SCF → BFI May 31, 14:40 UTCMay 31, 15:45 UTC1h 5m
2026-05-30 EJA404 SCF → BFI May 30, 22:55 UTCMay 31, 00:05 UTC1h 10m
2026-05-30 EJA404 SCF → BFI May 30, 17:30 UTCMay 30, 22:15 UTC4h 45m
2026-05-30 EJA404 SCF → BFI May 30, 00:30 UTCMay 30, 02:00 UTC1h 30m
2026-05-29 EJA404 SCF → BFI May 29, 20:55 UTCMay 29, 21:15 UTC20m
2026-05-29 EJA404 SCF → BFI May 29, 19:05 UTCMay 29, 19:55 UTC50m
2026-05-29 EJA404 SCF → BFI May 29, 17:30 UTCMay 29, 18:05 UTC35m
2026-05-29 EJA404 SCF → BFI May 29, 03:10 UTCMay 29, 03:55 UTC45m
2026-05-28 EJA404 SCF → BFI May 28, 22:00 UTCMay 29, 00:25 UTC2h 25m
2026-05-28 EJA404 SCF → BFI May 28, 17:55 UTCMay 28, 20:00 UTC2h 5m
2026-05-28 EJA404 SCF → BFI May 28, 16:20 UTCMay 28, 17:05 UTC45m
2026-05-28 EJA404 SCF → BFI May 28, 13:50 UTCMay 28, 15:45 UTC1h 55m
2026-05-27 EJA404 SCF → BFI May 27, 23:45 UTCMay 28, 00:55 UTC1h 10m
2026-05-27 N404QS MTY → PNS May 27, 21:00 UTCMay 27, 23:05 UTC2h 5m
2026-05-27 N404QS - May 27, 17:50 UTCMay 27, 20:00 UTC2h 10m
2026-05-27 EJA404 SCF → BFI May 27, 15:20 UTCMay 27, 16:20 UTC1h 0m
2026-05-26 EJA404 SCF → BFI May 26, 22:39 UTCMay 26, 22:59 UTC20m
2026-05-26 N404QS - May 26, 15:14 UTCMay 26, 20:45 UTC5h 30m
2026-05-25 N404QS - May 25, 23:54 UTCMay 26, 00:49 UTC55m
2026-05-24 N404QS - May 24, 16:15 UTCMay 24, 17:20 UTC1h 5m
2026-05-23 EJA404 SCF → BFI May 23, 18:40 UTCMay 23, 19:05 UTC25m
2026-05-23 EJA404 SCF → BFI May 23, 14:45 UTCMay 23, 17:10 UTC2h 25m
2026-05-22 EJA404 SCF → BFI May 22, 18:25 UTCMay 22, 20:25 UTC2h 0m
2026-05-22 EJA404 SCF → BFI May 22, 16:50 UTCMay 22, 17:25 UTC35m
2026-05-22 EJA404 SCF → BFI May 22, 15:05 UTCMay 22, 15:50 UTC45m
2026-05-22 EJA404 SCF → BFI May 22, 12:00 UTCMay 22, 13:25 UTC1h 25m
2026-05-21 EJA404 SCF → BFI May 21, 20:45 UTCMay 21, 23:20 UTC2h 35m
2026-05-21 EJA404 SCF → BFI May 21, 16:10 UTCMay 21, 16:35 UTC25m
2026-05-21 EJA404 SCF → BFI May 21, 13:45 UTCMay 21, 15:20 UTC1h 35m
2026-05-20 EJA404 SCF → BFI May 20, 22:30 UTCMay 20, 23:50 UTC1h 20m
2026-05-20 EJA404 SCF → BFI May 20, 20:00 UTCMay 20, 21:25 UTC1h 25m
2026-05-20 EJA404 SCF → BFI May 20, 17:05 UTCMay 20, 18:55 UTC1h 50m
2026-05-20 EJA404 SCF → BFI May 20, 15:05 UTCMay 20, 15:35 UTC30m
2026-05-20 EJA404 SCF → BFI May 20, 03:25 UTCMay 20, 03:55 UTC30m
2026-05-20 EJA404 SCF → BFI May 20, 02:10 UTCMay 20, 02:45 UTC35m
2026-05-19 EJA404 SCF → BFI May 19, 22:40 UTCMay 19, 23:10 UTC30m
2026-05-19 EJA404 SCF → BFI May 19, 18:30 UTCMay 19, 20:35 UTC2h 5m
2026-05-19 EJA404 SCF → BFI May 19, 16:50 UTCMay 19, 17:35 UTC45m
2026-05-19 EJA404 SCF → BFI May 19, 15:15 UTCMay 19, 15:55 UTC40m
2026-05-19 EJA404 SCF → BFI May 19, 13:05 UTCMay 19, 13:25 UTC20m

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 N404QS page for operator, model, and routing details .

Mode-S A4BCEC frequently asked

What is Mode-S code A4BCEC?
A4BCEC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N404QS.
Where is Mode-S A4BCEC registered?
Mode-S code A4BCEC 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 A4BCEC broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BCEC, octal 51136354, decimal 10,796,268.
What flights does A4BCEC operate?
Mode-S A4BCEC has broadcast 2 distinct callsigns, including EJA404, N404QS.