Apparatus

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sensors Mode-S transponder

A545FC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N439QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, AILERCON 1.0 LLC, PIPKIN CHESTER JOHN TRUSTEE, PIPKIN JANICE ANN TRUSTEE, DESOLATION PARTNERS INC, HRE HOLDINGS II LLC

Hex
A545FC
Octal
51242774
Decimal
10,831,356
Country
US
Tail
N439QS
Type
E55P
No current signal · last broadcast 2d ago
Flights observed
154
Distinct callsigns
2
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A545FC.

Country allocation

The ICAO 24-bit address A545FC 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
EJA439 - 145 2026-07-11
N439QS - 9 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 EJA439 - Jul 11, 20:30 UTCJul 11, 21:50 UTC1h 20m
2026-07-09 EJA439 - Jul 9, 15:15 UTCJul 9, 16:25 UTC1h 10m
2026-07-07 EJA439 - Jul 7, 11:20 UTCJul 7, 12:05 UTC45m
2026-07-06 EJA439 MSY → DAL Jul 6, 11:40 UTCJul 6, 12:50 UTC1h 10m
2026-07-05 EJA439 - Jul 5, 15:00 UTCJul 5, 16:10 UTC1h 10m
2026-07-04 EJA439 - Jul 4, 17:35 UTCJul 4, 18:35 UTC1h 0m
2026-07-04 EJA439 - Jul 4, 15:55 UTCJul 4, 16:40 UTC45m
2026-07-04 EJA439 - Jul 4, 13:15 UTCJul 4, 13:45 UTC30m
2026-07-03 EJA439 - Jul 3, 12:55 UTCJul 3, 13:55 UTC1h 0m
2026-07-02 EJA439 YYZ → LUK Jul 2, 21:25 UTCJul 2, 22:35 UTC1h 10m
2026-07-02 EJA439 - Jul 2, 18:40 UTCJul 2, 20:25 UTC1h 45m
2026-07-02 EJA439 - Jul 2, 15:40 UTCJul 2, 16:10 UTC30m
2026-07-02 EJA439 - Jul 2, 13:35 UTCJul 2, 14:20 UTC45m
2026-07-01 EJA439 - Jul 1, 22:30 UTCJul 1, 23:10 UTC40m
2026-06-28 EJA439 - Jun 28, 18:14 UTCJun 28, 19:29 UTC1h 15m
2026-06-28 EJA439 - Jun 28, 16:35 UTCJun 28, 17:34 UTC1h 0m
2026-06-28 EJA439 - Jun 28, 14:39 UTCJun 28, 15:20 UTC40m
2026-06-28 EJA439 - Jun 28, 12:05 UTCJun 28, 13:19 UTC1h 15m
2026-06-27 EJA439 - Jun 27, 22:40 UTCJun 27, 23:45 UTC1h 5m
2026-06-27 EJA439 - Jun 27, 19:19 UTCJun 27, 20:55 UTC1h 35m
2026-06-27 EJA439 NEW → MSY Jun 27, 17:20 UTCJun 27, 17:29 UTC10m
2026-06-27 EJA439 - Jun 27, 15:34 UTCJun 27, 16:20 UTC45m
2026-06-26 EJA439 - Jun 26, 20:40 UTCJun 26, 22:05 UTC1h 25m
2026-06-26 EJA439 - Jun 26, 17:25 UTCJun 26, 19:24 UTC2h 0m
2026-06-26 EJA439 - Jun 26, 14:25 UTCJun 26, 15:29 UTC1h 5m
2026-06-23 N439QS - Jun 23, 19:29 UTCJun 23, 19:59 UTC30m
2026-06-23 N439QS - Jun 23, 16:54 UTCJun 23, 17:04 UTC10m
2026-06-22 N439QS - Jun 22, 21:19 UTCJun 23, 00:00 UTC2h 40m
2026-06-22 EJA439 TOL → SUA Jun 22, 17:50 UTCJun 22, 20:10 UTC2h 20m
2026-06-22 EJA439 - Jun 22, 15:40 UTCJun 22, 16:14 UTC35m
2026-06-19 EJA439 BOS → PVC Jun 19, 18:09 UTCJun 19, 19:39 UTC1h 30m
2026-06-19 EJA439 BOS → PVC Jun 19, 17:24 UTCJun 19, 17:39 UTC15m
2026-06-18 EJA439 BOS → PVC Jun 18, 22:55 UTCJun 19, 15:54 UTC16h 59m
2026-06-18 EJA439 BOS → PVC Jun 18, 18:35 UTCJun 18, 20:55 UTC2h 20m
2026-06-18 EJA439 BOS → PVC Jun 18, 16:10 UTCJun 18, 17:45 UTC1h 35m
2026-06-18 EJA439 BOS → PVC Jun 18, 14:25 UTCJun 18, 14:35 UTC10m
2026-06-18 EJA439 BOS → PVC Jun 18, 12:35 UTCJun 18, 14:01 UTC1h 25m
2026-06-18 EJA439 BOS → PVC Jun 18, 02:35 UTCJun 18, 04:05 UTC1h 30m
2026-06-18 EJA439 BOS → PVC Jun 18, 00:55 UTCJun 18, 01:50 UTC55m
2026-06-17 EJA439 BOS → PVC Jun 17, 22:00 UTCJun 17, 22:15 UTC15m
2026-06-17 EJA439 BOS → PVC Jun 17, 05:15 UTCJun 17, 05:55 UTC40m
2026-06-17 EJA439 BOS → PVC Jun 17, 01:25 UTCJun 17, 02:05 UTC40m
2026-06-15 EJA439 BOS → PVC Jun 15, 21:40 UTCJun 16, 01:35 UTC3h 55m
2026-06-15 EJA439 BOS → PVC Jun 15, 19:10 UTCJun 15, 19:35 UTC25m
2026-06-15 EJA439 BOS → PVC Jun 15, 06:24 UTCJun 15, 07:20 UTC55m
2026-06-14 EJA439 BOS → PVC Jun 14, 20:10 UTCJun 14, 22:35 UTC2h 25m
2026-06-14 EJA439 BOS → PVC Jun 14, 17:00 UTCJun 14, 17:30 UTC30m
2026-06-14 EJA439 BOS → PVC Jun 14, 15:10 UTCJun 14, 16:05 UTC55m
2026-06-14 EJA439 BOS → PVC Jun 14, 13:00 UTCJun 14, 14:10 UTC1h 10m
2026-06-12 EJA439 BOS → PVC Jun 12, 00:50 UTCJun 12, 01:50 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 N439QS page for operator, model, and routing details .

Mode-S A545FC frequently asked

What is Mode-S code A545FC?
A545FC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N439QS.
Where is Mode-S A545FC registered?
Mode-S code A545FC 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 A545FC broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A545FC, octal 51242774, decimal 10,831,356.
What flights does A545FC operate?
Mode-S A545FC has broadcast 2 distinct callsigns, including EJA439, N439QS.