Apparatus

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sensors Mode-S transponder

A39AF5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N331QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, ABATAKA LLC, BEACON HILL INVESTMENTS LLC, MAY TEN LLC, SLICK ENTERPRISES INC, TJC AVIATION LLC

Hex
A39AF5
Octal
50715365
Decimal
10,722,037
Country
US
Tail
N331QS
Type
E55P
No current signal · last broadcast 17h ago
Flights observed
82
Distinct callsigns
2
Country
US
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S A39AF5.

Country allocation

The ICAO 24-bit address A39AF5 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
EJA331 - 81 2026-06-12
N331QS - 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 EJA331 - Jun 12, 17:50 UTCJun 12, 18:15 UTC25m
2026-06-12 EJA331 - Jun 12, 14:25 UTCJun 12, 15:00 UTC35m
2026-06-12 EJA331 - Jun 12, 12:05 UTCJun 12, 13:45 UTC1h 40m
2026-06-11 EJA331 - Jun 11, 21:05 UTCJun 11, 22:15 UTC1h 10m
2026-06-11 EJA331 PSQ → RDU Jun 11, 16:05 UTCJun 11, 17:00 UTC55m
2026-06-11 EJA331 - Jun 11, 14:30 UTCJun 11, 15:20 UTC50m
2026-06-11 EJA331 TEB → MVY Jun 11, 13:05 UTCJun 11, 13:50 UTC45m
2026-06-10 EJA331 HYA → ACK Jun 10, 23:05 UTCJun 11, 00:20 UTC1h 15m
2026-06-10 EJA331 HYA → ACK Jun 10, 20:05 UTCJun 10, 20:55 UTC50m
2026-06-10 EJA331 HYA → ACK Jun 10, 18:50 UTCJun 10, 19:30 UTC40m
2026-06-10 EJA331 HYA → ACK Jun 10, 13:30 UTCJun 10, 16:45 UTC3h 15m
2026-06-10 EJA331 HYA → ACK Jun 10, 12:00 UTCJun 10, 12:25 UTC25m
2026-06-09 EJA331 HYA → ACK Jun 9, 21:25 UTCJun 9, 22:10 UTC45m
2026-06-09 EJA331 HYA → ACK Jun 9, 17:40 UTCJun 9, 20:55 UTC3h 15m
2026-06-09 EJA331 HYA → ACK Jun 9, 15:30 UTCJun 9, 15:50 UTC20m
2026-06-09 EJA331 HYA → ACK Jun 9, 01:50 UTCJun 9, 02:55 UTC1h 5m
2026-06-08 EJA331 HYA → ACK Jun 8, 22:50 UTCJun 9, 01:10 UTC2h 20m
2026-06-08 EJA331 HYA → ACK Jun 8, 21:55 UTCJun 8, 22:00 UTC5m
2026-06-08 EJA331 HYA → ACK Jun 8, 20:05 UTCJun 8, 20:55 UTC50m
2026-06-08 EJA331 HYA → ACK Jun 8, 16:55 UTCJun 8, 17:35 UTC40m
2026-06-08 EJA331 HYA → ACK Jun 8, 02:25 UTCJun 8, 03:25 UTC1h 0m
2026-06-08 EJA331 HYA → ACK Jun 8, 00:20 UTCJun 8, 01:15 UTC55m
2026-06-07 EJA331 HYA → ACK Jun 7, 22:10 UTCJun 7, 23:50 UTC1h 40m
2026-06-07 EJA331 HYA → ACK Jun 7, 20:00 UTCJun 7, 20:45 UTC45m
2026-06-07 EJA331 HYA → ACK Jun 7, 16:05 UTCJun 7, 16:35 UTC30m
2026-06-06 EJA331 HYA → ACK Jun 6, 20:49 UTCJun 6, 21:40 UTC50m
2026-06-06 EJA331 HYA → ACK Jun 6, 19:50 UTCJun 6, 20:05 UTC15m
2026-06-06 EJA331 HYA → ACK Jun 6, 16:50 UTCJun 6, 18:29 UTC1h 40m
2026-06-06 EJA331 HYA → ACK Jun 6, 14:25 UTCJun 6, 14:40 UTC15m
2026-06-05 EJA331 HYA → ACK Jun 5, 20:55 UTCJun 5, 23:00 UTC2h 5m
2026-06-05 EJA331 HYA → ACK Jun 5, 19:45 UTCJun 5, 20:15 UTC30m
2026-06-05 EJA331 HYA → ACK Jun 5, 18:00 UTCJun 5, 18:35 UTC35m
2026-06-05 EJA331 HYA → ACK Jun 5, 15:05 UTCJun 5, 15:25 UTC20m
2026-06-05 EJA331 HYA → ACK Jun 5, 00:40 UTCJun 5, 01:40 UTC1h 0m
2026-06-04 EJA331 HYA → ACK Jun 4, 22:20 UTCJun 4, 23:50 UTC1h 30m
2026-06-04 EJA331 HYA → ACK Jun 4, 20:00 UTCJun 4, 21:25 UTC1h 25m
2026-06-04 EJA331 HYA → ACK Jun 4, 15:50 UTCJun 4, 18:55 UTC3h 5m
2026-06-04 EJA331 HYA → ACK Jun 4, 00:00 UTCJun 4, 00:50 UTC50m
2026-06-03 EJA331 HYA → ACK Jun 3, 22:40 UTCJun 3, 23:30 UTC50m
2026-06-03 EJA331 HYA → ACK Jun 3, 20:00 UTCJun 3, 21:00 UTC1h 0m
2026-06-03 EJA331 HYA → ACK Jun 3, 16:55 UTCJun 3, 18:55 UTC2h 0m
2026-06-03 EJA331 HYA → ACK Jun 3, 04:10 UTCJun 3, 04:50 UTC40m
2026-06-03 EJA331 HYA → ACK Jun 3, 00:40 UTCJun 3, 02:35 UTC1h 55m
2026-06-02 EJA331 HYA → ACK Jun 2, 22:50 UTCJun 2, 23:55 UTC1h 5m
2026-06-02 EJA331 HYA → ACK Jun 2, 20:50 UTCJun 2, 21:40 UTC50m
2026-06-02 EJA331 HYA → ACK Jun 2, 02:15 UTCJun 2, 03:10 UTC55m
2026-06-02 EJA331 HYA → ACK Jun 2, 00:25 UTCJun 2, 01:15 UTC50m
2026-05-29 EJA331 HYA → ACK May 29, 12:25 UTCMay 29, 15:00 UTC2h 35m
2026-05-28 EJA331 HYA → ACK May 28, 19:05 UTCMay 28, 21:05 UTC2h 0m
2026-05-28 EJA331 HYA → ACK May 28, 16:45 UTCMay 28, 17:25 UTC40m

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 N331QS page for operator, model, and routing details .

Mode-S A39AF5 frequently asked

What is Mode-S code A39AF5?
A39AF5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N331QS.
Where is Mode-S A39AF5 registered?
Mode-S code A39AF5 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 A39AF5 broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39AF5, octal 50715365, decimal 10,722,037.
What flights does A39AF5 operate?
Mode-S A39AF5 has broadcast 2 distinct callsigns, including EJA331, N331QS.