Apparatus

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sensors Mode-S transponder

AA31C2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N756QS · BOMBARDIER BD-100 Challenger 350 · operated by NETJETS SALES INC, ALONIM US INVESTMENTS CORP, H7 CHALLENGER LLC, K&SCANE LLC, NEFF AIR LLC, ORSINI ENTERPRISES LLC

Hex
AA31C2
Octal
52430702
Decimal
11,153,858
Country
US
Tail
N756QS
Type
CL35
No current signal · last broadcast 15d ago
Flights observed
150
Distinct callsigns
2
Country
US
Last broadcast
15d ago

Last known position

Most recent position reported by Mode-S AA31C2.

Country allocation

The ICAO 24-bit address AA31C2 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
EJA756 - 131 2026-06-29
N756QS - 19 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 EJA756 - Jun 29, 04:14 UTCJun 29, 06:14 UTC2h 0m
2026-06-29 EJA756 SFO → SLC Jun 29, 02:25 UTCJun 29, 03:44 UTC1h 20m
2026-06-28 EJA756 - Jun 28, 21:34 UTCJun 28, 22:49 UTC1h 15m
2026-06-27 EJA756 - Jun 27, 05:25 UTCJun 27, 07:39 UTC2h 15m
2026-06-27 EJA756 SJC → MVW Jun 27, 02:59 UTCJun 27, 04:49 UTC1h 50m
2026-06-26 EJA756 CCR → SJC Jun 26, 23:09 UTCJun 26, 23:34 UTC25m
2026-06-26 EJA756 BFI → CCR Jun 26, 20:59 UTCJun 26, 22:25 UTC1h 25m
2026-06-26 N756QS - Jun 26, 17:29 UTCJun 26, 19:00 UTC1h 30m
2026-06-25 N756QS - Jun 25, 20:09 UTCJun 25, 20:34 UTC25m
2026-06-20 N756QS - Jun 20, 15:19 UTCJun 20, 20:49 UTC5h 30m
2026-06-15 EJA756 - Jun 15, 18:15 UTCJun 15, 19:55 UTC1h 40m
2026-06-15 EJA756 - Jun 15, 14:55 UTCJun 15, 16:55 UTC2h 0m
2026-06-15 EJA756 - Jun 15, 13:10 UTCJun 15, 13:25 UTC15m
2026-06-15 EJA756 - Jun 15, 11:49 UTCJun 15, 12:25 UTC35m
2026-06-14 EJA756 - Jun 14, 22:20 UTCJun 14, 22:30 UTC10m
2026-06-14 EJA756 - Jun 14, 17:20 UTCJun 14, 21:00 UTC3h 40m
2026-06-14 EJA756 - Jun 14, 14:00 UTCJun 14, 15:45 UTC1h 45m
2026-06-12 EJA756 - Jun 12, 02:15 UTCJun 12, 02:55 UTC40m
2026-06-11 EJA756 - Jun 11, 22:05 UTCJun 12, 01:20 UTC3h 16m
2026-06-11 EJA756 SUS → DFW Jun 11, 01:45 UTCJun 11, 07:15 UTC5h 30m
2026-06-10 EJA756 SUS → DFW Jun 10, 02:25 UTCJun 10, 03:05 UTC40m
2026-06-09 EJA756 SUS → DFW Jun 9, 21:00 UTCJun 10, 01:10 UTC4h 10m
2026-06-09 EJA756 SUS → DFW Jun 9, 19:25 UTCJun 9, 19:50 UTC25m
2026-06-09 EJA756 SUS → DFW Jun 9, 16:45 UTCJun 9, 17:30 UTC45m
2026-06-08 EJA756 SUS → DFW Jun 8, 05:00 UTCJun 8, 05:25 UTC25m
2026-06-07 N756QS - Jun 7, 23:10 UTCJun 8, 04:20 UTC5h 10m
2026-06-07 N756QS - Jun 7, 20:25 UTCJun 7, 20:40 UTC15m
2026-06-07 EJA756 SUS → DFW Jun 7, 01:00 UTCJun 7, 01:09 UTC10m
2026-06-05 EJA756 SUS → DFW Jun 5, 21:00 UTCJun 5, 21:20 UTC20m
2026-06-05 EJA756 SUS → DFW Jun 5, 17:30 UTCJun 5, 19:25 UTC1h 55m
2026-06-05 EJA756 SUS → DFW Jun 5, 15:00 UTCJun 5, 16:25 UTC1h 25m
2026-06-04 EJA756 SUS → DFW Jun 4, 01:10 UTCJun 4, 02:35 UTC1h 25m
2026-06-03 EJA756 SUS → DFW Jun 3, 23:15 UTCJun 4, 00:10 UTC55m
2026-06-03 EJA756 SUS → DFW Jun 3, 14:50 UTCJun 3, 15:30 UTC40m
2026-06-03 EJA756 SUS → DFW Jun 3, 00:25 UTCJun 3, 01:20 UTC55m
2026-06-02 EJA756 SUS → DFW Jun 2, 16:20 UTCJun 2, 20:15 UTC3h 55m
2026-06-01 EJA756 SUS → DFW Jun 1, 22:50 UTCJun 2, 02:10 UTC3h 20m
2026-06-01 EJA756 SUS → DFW Jun 1, 18:20 UTCJun 1, 20:35 UTC2h 15m
2026-05-31 EJA756 SUS → DFW May 31, 22:15 UTCJun 1, 02:50 UTC4h 35m
2026-05-31 EJA756 SUS → DFW May 31, 20:00 UTCMay 31, 20:15 UTC15m
2026-05-31 EJA756 SUS → DFW May 31, 14:05 UTCMay 31, 19:05 UTC5h 0m
2026-05-30 N756QS - May 30, 11:10 UTCMay 30, 20:40 UTC9h 30m
2026-05-29 N756QS - May 29, 17:40 UTCMay 29, 19:50 UTC2h 10m
2026-05-29 N756QS - May 29, 14:00 UTCMay 29, 14:15 UTC15m
2026-05-29 N756QS - May 29, 11:45 UTCMay 29, 13:25 UTC1h 40m
2026-05-28 EJA756 SUS → DFW May 28, 11:40 UTCMay 28, 14:05 UTC2h 25m
2026-05-27 EJA756 SUS → DFW May 27, 20:35 UTCMay 27, 21:05 UTC30m
2026-05-27 EJA756 SUS → DFW May 27, 13:10 UTCMay 27, 19:25 UTC6h 15m
2026-05-26 EJA756 SUS → DFW May 26, 20:34 UTCMay 26, 22:44 UTC2h 10m
2026-05-26 EJA756 SUS → DFW May 26, 18:59 UTCMay 26, 19:25 UTC25m

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 N756QS page for operator, model, and routing details .

Mode-S AA31C2 frequently asked

What is Mode-S code AA31C2?
AA31C2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N756QS.
Where is Mode-S AA31C2 registered?
Mode-S code AA31C2 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 AA31C2 broadcasting right now?
No active broadcast right now. Last signal was 15d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA31C2, octal 52430702, decimal 11,153,858.
What flights does AA31C2 operate?
Mode-S AA31C2 has broadcast 2 distinct callsigns, including EJA756, N756QS.