Apparatus

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sensors Mode-S transponder

A4C0A3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405QS · EMBRAER EMB-505 Phenom 300 · operated by NJI SALES INC

Hex
A4C0A3
Octal
51140243
Decimal
10,797,219
Country
US
Tail
N405QS
Type
E55P
No current signal · last broadcast 3d ago
Flights observed
45
Distinct callsigns
1
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S A4C0A3.

Country allocation

The ICAO 24-bit address A4C0A3 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 1 distinct

Callsign Airline Flights Last seen
EJA405 - 45 2026-07-11

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-07-11 EJA405 - Jul 11, 18:15 UTCJul 11, 18:35 UTC20m
2026-07-10 EJA405 - Jul 10, 14:15 UTCJul 10, 15:15 UTC1h 0m
2026-07-10 EJA405 - Jul 10, 11:55 UTCJul 10, 12:35 UTC40m
2026-07-09 EJA405 DAL → SCF Jul 9, 17:15 UTCJul 9, 17:40 UTC25m
2026-06-07 EJA405 DAL → SCF Jun 7, 15:35 UTCJun 7, 16:35 UTC1h 0m
2026-06-07 EJA405 DAL → SCF Jun 7, 13:35 UTCJun 7, 14:25 UTC50m
2026-06-04 EJA405 DAL → SCF Jun 4, 17:55 UTCJun 4, 20:25 UTC2h 30m
2026-05-29 EJA405 DAL → SCF May 29, 16:10 UTCMay 29, 18:10 UTC2h 0m
2026-05-29 EJA405 DAL → SCF May 29, 14:05 UTCMay 29, 15:10 UTC1h 5m
2026-05-11 EJA405 DAL → SCF May 11, 16:15 UTCMay 11, 17:05 UTC51m
2026-05-11 EJA405 DAL → SCF May 11, 14:35 UTCMay 11, 15:25 UTC50m
2026-05-11 EJA405 DAL → SCF May 11, 12:25 UTCMay 11, 13:10 UTC45m
2026-05-10 EJA405 DAL → SCF May 10, 18:05 UTCMay 10, 19:45 UTC1h 40m
2026-05-10 EJA405 DAL → SCF May 10, 14:40 UTCMay 10, 16:04 UTC1h 25m
2026-05-10 EJA405 DAL → SCF May 10, 13:05 UTCMay 10, 13:40 UTC35m
2026-05-10 EJA405 DAL → SCF May 10, 11:10 UTCMay 10, 11:40 UTC30m
2026-05-07 EJA405 DAL → SCF May 7, 19:20 UTCMay 7, 19:40 UTC20m
2026-05-07 EJA405 DAL → SCF May 7, 17:55 UTCMay 7, 18:35 UTC40m
2026-05-07 EJA405 DAL → SCF May 7, 15:55 UTCMay 7, 16:30 UTC35m
2026-05-06 EJA405 DAL → SCF May 6, 21:45 UTCMay 6, 22:55 UTC1h 10m
2026-05-06 EJA405 DAL → SCF May 6, 19:40 UTCMay 6, 20:20 UTC40m
2026-05-06 EJA405 DAL → SCF May 6, 17:25 UTCMay 6, 18:35 UTC1h 9m
2026-05-06 EJA405 DAL → SCF May 6, 14:35 UTCMay 6, 16:25 UTC1h 50m
2026-05-04 EJA405 DAL → SCF May 4, 18:00 UTCMay 4, 19:15 UTC1h 16m
2026-05-04 EJA405 DAL → SCF May 4, 15:35 UTCMay 4, 16:05 UTC30m
2026-05-04 EJA405 DAL → SCF May 4, 13:55 UTCMay 4, 14:45 UTC50m
2026-05-04 EJA405 DAL → SCF May 4, 11:10 UTCMay 4, 12:55 UTC1h 45m
2026-05-03 EJA405 DAL → SCF May 3, 19:25 UTCMay 3, 20:49 UTC1h 25m
2026-05-03 EJA405 DAL → SCF May 3, 17:20 UTCMay 3, 18:50 UTC1h 30m
2026-05-03 EJA405 DAL → SCF May 3, 15:30 UTCMay 3, 16:05 UTC35m
2026-04-29 EJA405 DAL → SCF Apr 29, 17:40 UTCApr 29, 18:50 UTC1h 10m
2026-04-29 EJA405 DAL → SCF Apr 29, 15:10 UTCApr 29, 15:45 UTC35m
2026-04-28 EJA405 DAL → SCF Apr 28, 21:55 UTCApr 29, 01:25 UTC3h 30m
2026-04-28 EJA405 DAL → SCF Apr 28, 18:15 UTCApr 28, 21:05 UTC2h 50m
2026-04-28 EJA405 DAL → SCF Apr 28, 14:45 UTCApr 28, 15:40 UTC55m
2026-04-28 EJA405 DAL → SCF Apr 28, 00:15 UTCApr 28, 00:45 UTC30m
2026-04-27 EJA405 DAL → SCF Apr 27, 20:10 UTCApr 27, 20:25 UTC15m
2026-04-27 EJA405 DAL → SCF Apr 27, 17:45 UTCApr 27, 19:00 UTC1h 15m
2026-04-27 EJA405 DAL → SCF Apr 27, 04:00 UTCApr 27, 04:45 UTC45m
2026-04-26 EJA405 DAL → SCF Apr 26, 23:50 UTCApr 27, 00:55 UTC1h 5m
2026-04-26 EJA405 DAL → SCF Apr 26, 21:45 UTCApr 26, 22:45 UTC1h 0m
2026-04-26 EJA405 DAL → SCF Apr 26, 18:30 UTCApr 26, 19:40 UTC1h 10m
2026-04-26 EJA405 DAL → SCF Apr 26, 05:55 UTCApr 26, 06:50 UTC55m
2026-04-25 EJA405 DAL → SCF Apr 25, 18:10 UTCApr 25, 19:10 UTC1h 0m
2026-04-25 EJA405 DAL → SCF Apr 25, 14:40 UTCApr 25, 17:25 UTC2h 45m

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 N405QS page for operator, model, and routing details .

Mode-S A4C0A3 frequently asked

What is Mode-S code A4C0A3?
A4C0A3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405QS.
Where is Mode-S A4C0A3 registered?
Mode-S code A4C0A3 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 A4C0A3 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C0A3, octal 51140243, decimal 10,797,219.
What flights does A4C0A3 operate?
Mode-S A4C0A3 has broadcast 1 distinct callsign, including EJA405.