Apparatus

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sensors Mode-S transponder

A3F518

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N354QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, NORTH HUSTED LLC

Hex
A3F518
Octal
50772430
Decimal
10,745,112
Country
US
Tail
N354QS
Type
E55P
No current signal · last broadcast Jul 26, 20:25 UTC
Flights observed
210
Distinct callsigns
2
Country
US
Last broadcast
Jul 26, 20:25 UTC

Last known position

Most recent position reported by Mode-S A3F518.

Country allocation

The ICAO 24-bit address A3F518 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
EJA354 NetJets 200 2026-07-26
N354QS - 10 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EJA354 SJO → MDE Jul 26, 18:20 UTCJul 26, 20:25 UTC2h 5m
2026-07-26 N354QS - Jul 26, 16:05 UTCJul 26, 16:40 UTC35m
2026-07-25 N354QS - Jul 25, 21:15 UTCJul 26, 16:40 UTC19h 26m
2026-07-25 N354QS - Jul 25, 19:05 UTCJul 25, 19:50 UTC45m
2026-07-25 EJA354 SJO → MDE Jul 25, 17:40 UTCJul 25, 18:10 UTC30m
2026-07-25 EJA354 SJO → MDE Jul 25, 14:50 UTCJul 25, 16:40 UTC1h 50m
2026-07-24 EJA354 SJO → MDE Jul 24, 23:15 UTCJul 25, 00:10 UTC55m
2026-07-24 EJA354 SJO → MDE Jul 24, 21:35 UTCJul 24, 22:30 UTC55m
2026-07-24 EJA354 SJO → MDE Jul 24, 15:45 UTCJul 24, 16:45 UTC1h 0m
2026-07-24 EJA354 SJO → MDE Jul 24, 14:10 UTCJul 24, 14:30 UTC20m
2026-07-23 EJA354 SJO → MDE Jul 23, 21:15 UTCJul 23, 23:40 UTC2h 25m
2026-07-23 EJA354 SJO → MDE Jul 23, 19:10 UTCJul 23, 19:40 UTC30m
2026-07-23 EJA354 SJO → MDE Jul 23, 15:30 UTCJul 23, 17:20 UTC1h 50m
2026-07-23 EJA354 SJO → MDE Jul 23, 12:55 UTCJul 23, 13:10 UTC15m
2026-07-22 EJA354 SJO → MDE Jul 22, 21:15 UTCJul 22, 23:15 UTC2h 0m
2026-07-22 EJA354 SJO → MDE Jul 22, 18:40 UTCJul 22, 19:00 UTC20m
2026-07-22 EJA354 SJO → MDE Jul 22, 14:55 UTCJul 22, 17:00 UTC2h 5m
2026-07-22 EJA354 SJO → MDE Jul 22, 13:50 UTCJul 22, 14:10 UTC20m
2026-07-22 EJA354 SJO → MDE Jul 22, 12:05 UTCJul 22, 12:20 UTC15m
2026-07-21 EJA354 SJO → MDE Jul 21, 22:10 UTCJul 21, 23:10 UTC1h 0m
2026-07-21 EJA354 SJO → MDE Jul 21, 21:40 UTCJul 21, 21:50 UTC10m
2026-07-21 EJA354 SJO → MDE Jul 21, 17:25 UTCJul 21, 19:25 UTC2h 0m
2026-07-21 EJA354 SJO → MDE Jul 21, 14:55 UTCJul 21, 16:30 UTC1h 35m
2026-07-21 EJA354 SJO → MDE Jul 21, 13:10 UTCJul 21, 14:10 UTC1h 0m
2026-07-20 EJA354 SJO → MDE Jul 20, 22:05 UTCJul 20, 22:20 UTC15m
2026-07-20 EJA354 SJO → MDE Jul 20, 20:15 UTCJul 20, 21:35 UTC1h 20m
2026-07-20 EJA354 SJO → MDE Jul 20, 16:35 UTCJul 20, 17:55 UTC1h 20m
2026-07-20 EJA354 SJO → MDE Jul 20, 14:30 UTCJul 20, 15:05 UTC35m
2026-07-20 EJA354 SJO → MDE Jul 20, 10:35 UTCJul 20, 13:40 UTC3h 5m
2026-07-19 EJA354 SJO → MDE Jul 19, 18:35 UTCJul 19, 19:20 UTC45m
2026-07-19 EJA354 SJO → MDE Jul 19, 16:40 UTCJul 19, 17:20 UTC40m
2026-07-19 EJA354 SJO → MDE Jul 19, 15:50 UTCJul 19, 16:05 UTC15m
2026-07-19 EJA354 SJO → MDE Jul 19, 12:35 UTCJul 19, 13:15 UTC40m
2026-07-19 EJA354 SJO → MDE Jul 19, 09:55 UTCJul 19, 10:50 UTC55m
2026-07-18 EJA354 SJO → MDE Jul 18, 14:10 UTCJul 18, 14:55 UTC45m
2026-07-17 EJA354 SJO → MDE Jul 17, 21:05 UTCJul 17, 22:00 UTC55m
2026-07-17 EJA354 SJO → MDE Jul 17, 17:55 UTCJul 17, 18:55 UTC1h 0m
2026-07-17 EJA354 SJO → MDE Jul 17, 15:15 UTCJul 17, 15:49 UTC35m
2026-07-17 EJA354 SJO → MDE Jul 17, 12:50 UTCJul 17, 14:15 UTC1h 25m
2026-07-17 EJA354 SJO → MDE Jul 17, 11:35 UTCJul 17, 12:00 UTC25m
2026-07-16 EJA354 SJO → MDE Jul 16, 19:45 UTCJul 16, 22:10 UTC2h 25m
2026-07-16 EJA354 SJO → MDE Jul 16, 17:54 UTCJul 16, 18:19 UTC25m
2026-07-16 EJA354 SJO → MDE Jul 16, 16:19 UTCJul 16, 16:30 UTC10m
2026-07-16 EJA354 - Jul 16, 11:54 UTCJul 16, 13:54 UTC2h 0m
2026-07-16 EJA354 - Jul 16, 00:20 UTCJul 16, 02:10 UTC1h 50m
2026-07-15 EJA354 CLL → VPZ Jul 15, 21:25 UTCJul 15, 23:45 UTC2h 20m
2026-07-15 EJA354 - Jul 15, 20:10 UTCJul 15, 20:35 UTC25m
2026-07-15 EJA354 - Jul 15, 18:20 UTCJul 15, 19:10 UTC50m
2026-07-15 EJA354 - Jul 15, 16:05 UTCJul 15, 17:00 UTC55m
2026-07-15 EJA354 - Jul 15, 01:15 UTCJul 15, 01:55 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 N354QS page for operator, model, and routing details .

Mode-S A3F518 frequently asked

What is Mode-S code A3F518?
A3F518 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N354QS.
Where is Mode-S A3F518 registered?
Mode-S code A3F518 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 A3F518 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3F518, octal 50772430, decimal 10,745,112.
What flights does A3F518 operate?
Mode-S A3F518 has broadcast 2 distinct callsigns, including EJA354, N354QS.