Apparatus

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sensors Mode-S transponder

A1D4F2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N217QS · BOMBARDIER CL-600 Challenger · operated by NETJETS SALES INC, NETJETS AVIATION INC

Hex
A1D4F2
Octal
50352362
Decimal
10,605,810
Country
US
Tail
N217QS
Type
CL60
No current signal · last broadcast 13d ago
Flights observed
130
Distinct callsigns
2
Country
US
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S A1D4F2.

Country allocation

The ICAO 24-bit address A1D4F2 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
EJA217 - 114 2026-07-20
N217QS - 16 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 EJA217 IAD → DAL Jul 20, 18:55 UTCJul 20, 21:25 UTC2h 30m
2026-07-20 EJA217 TEB → IAD Jul 20, 17:00 UTCJul 20, 17:50 UTC50m
2026-07-20 EJA217 - Jul 20, 12:35 UTCJul 20, 13:45 UTC1h 10m
2026-07-20 EJA217 TEB → DTW Jul 20, 10:25 UTCJul 20, 11:40 UTC1h 15m
2026-07-19 EJA217 - Jul 19, 12:15 UTCJul 19, 15:55 UTC3h 40m
2026-07-18 N217QS - Jul 18, 20:00 UTCJul 18, 20:30 UTC30m
2026-07-16 N217QS - Jul 16, 12:44 UTCJul 16, 13:05 UTC20m
2026-07-16 EJA217 - Jul 16, 11:25 UTCJul 16, 11:34 UTC10m
2026-07-16 EJA217 - Jul 16, 01:30 UTCJul 16, 02:55 UTC1h 25m
2026-07-15 EJA217 SFO → VNY Jul 15, 15:05 UTCJul 15, 16:05 UTC1h 0m
2026-07-15 EJA217 SFO → VNY Jul 15, 12:35 UTCJul 15, 13:30 UTC55m
2026-07-14 EJA217 SFO → VNY Jul 14, 17:10 UTCJul 14, 19:50 UTC2h 40m
2026-07-14 EJA217 SFO → VNY Jul 14, 15:45 UTCJul 14, 16:20 UTC35m
2026-07-02 EJA217 SFO → VNY Jul 2, 20:20 UTCJul 2, 23:15 UTC2h 55m
2026-07-01 EJA217 SFO → VNY Jul 1, 22:25 UTCJul 2, 00:25 UTC2h 0m
2026-07-01 EJA217 SFO → VNY Jul 1, 20:05 UTCJul 1, 20:25 UTC20m
2026-07-01 EJA217 SFO → VNY Jul 1, 16:30 UTCJul 1, 19:15 UTC2h 45m
2026-06-30 EJA217 SFO → VNY Jun 30, 21:35 UTCJun 30, 22:50 UTC1h 15m
2026-06-28 EJA217 SFO → VNY Jun 28, 17:39 UTCJun 28, 19:55 UTC2h 15m
2026-06-28 EJA217 SFO → VNY Jun 28, 16:05 UTCJun 28, 16:39 UTC35m
2026-06-27 EJA217 SFO → VNY Jun 27, 16:14 UTCJun 27, 17:04 UTC50m
2026-06-27 EJA217 SFO → VNY Jun 27, 12:55 UTCJun 27, 15:24 UTC2h 30m
2026-06-26 EJA217 SFO → VNY Jun 26, 22:14 UTCJun 27, 00:10 UTC1h 55m
2026-06-26 EJA217 SFO → VNY Jun 26, 19:24 UTCJun 26, 20:00 UTC35m
2026-06-26 EJA217 SFO → VNY Jun 26, 17:44 UTCJun 26, 18:15 UTC30m
2026-06-26 EJA217 SFO → VNY Jun 26, 14:09 UTCJun 26, 15:20 UTC1h 10m
2026-06-25 EJA217 SFO → VNY Jun 25, 20:49 UTCJun 25, 21:55 UTC1h 5m
2026-06-25 EJA217 SFO → VNY Jun 25, 17:30 UTCJun 25, 20:09 UTC2h 40m
2026-06-25 EJA217 SFO → VNY Jun 25, 15:24 UTCJun 25, 16:05 UTC40m
2026-06-24 EJA217 SFO → VNY Jun 24, 20:24 UTCJun 24, 23:34 UTC3h 10m
2026-06-24 EJA217 SFO → VNY Jun 24, 17:45 UTCJun 24, 18:20 UTC35m
2026-06-24 EJA217 SFO → VNY Jun 24, 14:50 UTCJun 24, 16:45 UTC1h 55m
2026-06-22 EJA217 SFO → VNY Jun 22, 16:24 UTCJun 22, 17:40 UTC1h 15m
2026-06-22 EJA217 SFO → VNY Jun 22, 14:40 UTCJun 22, 15:54 UTC1h 15m
2026-06-21 EJA217 SFO → VNY Jun 21, 19:55 UTCJun 21, 20:34 UTC40m
2026-06-21 EJA217 SFO → VNY Jun 21, 17:39 UTCJun 21, 18:50 UTC1h 10m
2026-06-21 EJA217 SFO → VNY Jun 21, 13:59 UTCJun 21, 15:19 UTC1h 20m
2026-06-20 EJA217 SFO → VNY Jun 20, 17:10 UTCJun 20, 18:10 UTC1h 0m
2026-06-16 N217QS - Jun 16, 15:30 UTCJun 17, 00:15 UTC8h 46m
2026-06-16 EJA217 SFO → VNY Jun 16, 10:25 UTCJun 16, 12:55 UTC2h 30m
2026-06-15 EJA217 SFO → VNY Jun 15, 19:14 UTCJun 15, 20:00 UTC45m
2026-06-15 EJA217 SFO → VNY Jun 15, 17:30 UTCJun 15, 17:59 UTC30m
2026-06-15 EJA217 SFO → VNY Jun 15, 14:55 UTCJun 15, 15:30 UTC35m
2026-06-14 EJA217 SFO → VNY Jun 14, 21:35 UTCJun 14, 22:20 UTC45m
2026-06-13 EJA217 SFO → VNY Jun 13, 03:20 UTCJun 13, 04:20 UTC1h 0m
2026-06-13 EJA217 SFO → VNY Jun 13, 00:30 UTCJun 13, 00:50 UTC20m
2026-06-12 EJA217 SFO → VNY Jun 12, 02:30 UTCJun 12, 03:40 UTC1h 10m
2026-06-11 EJA217 SFO → VNY Jun 11, 23:25 UTCJun 12, 01:00 UTC1h 36m
2026-06-11 EJA217 SFO → VNY Jun 11, 20:55 UTCJun 11, 22:10 UTC1h 15m
2026-06-11 EJA217 SFO → VNY Jun 11, 16:55 UTCJun 11, 18:30 UTC1h 35m

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 N217QS page for operator, model, and routing details .

Mode-S A1D4F2 frequently asked

What is Mode-S code A1D4F2?
A1D4F2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N217QS.
Where is Mode-S A1D4F2 registered?
Mode-S code A1D4F2 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 A1D4F2 broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D4F2, octal 50352362, decimal 10,605,810.
What flights does A1D4F2 operate?
Mode-S A1D4F2 has broadcast 2 distinct callsigns, including EJA217, N217QS.