Apparatus

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sensors Mode-S transponder

A23C93

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N243QS · BOMBARDIER CL-600 Challenger · operated by NETJETS SALES INC, ALJ GROUP NORTH AMERICA CORPORATION, BAIRD ENTERPRISES LLC, BASECAMP OCCUPATION LLC, DCAC FLIGHTS LLC, PLOTKIN GABRIEL

Hex
A23C93
Octal
50436223
Decimal
10,632,339
Country
US
Tail
N243QS
Type
CL60
No current signal · last broadcast Jul 22, 17:00 UTC
Flights observed
124
Distinct callsigns
2
Country
US
Last broadcast
Jul 22, 17:00 UTC

Last known position

Most recent position reported by Mode-S A23C93.

Country allocation

The ICAO 24-bit address A23C93 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
EJA243 - 119 2026-07-22
N243QS - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 EJA243 - Jul 22, 13:50 UTCJul 22, 17:00 UTC3h 10m
2026-07-22 EJA243 BOS → MMU Jul 22, 11:25 UTCJul 22, 11:30 UTC5m
2026-07-21 EJA243 - Jul 21, 14:55 UTCJul 21, 18:00 UTC3h 5m
2026-07-20 EJA243 - Jul 20, 18:25 UTCJul 20, 21:20 UTC2h 55m
2026-07-20 EJA243 - Jul 20, 14:00 UTCJul 20, 15:00 UTC1h 0m
2026-07-20 EJA243 - Jul 20, 11:55 UTCJul 20, 12:20 UTC25m
2026-07-19 EJA243 - Jul 19, 20:10 UTCJul 19, 21:05 UTC55m
2026-07-19 EJA243 IAD → MTN Jul 19, 17:50 UTCJul 19, 18:10 UTC20m
2026-07-19 EJA243 - Jul 19, 15:55 UTCJul 19, 16:30 UTC35m
2026-07-19 EJA243 - Jul 19, 14:15 UTCJul 19, 15:20 UTC1h 5m
2026-07-18 EJA243 - Jul 18, 18:55 UTCJul 18, 19:10 UTC15m
2026-07-18 EJA243 - Jul 18, 16:40 UTCJul 18, 17:30 UTC50m
2026-07-18 EJA243 - Jul 18, 14:00 UTCJul 18, 15:15 UTC1h 15m
2026-07-17 EJA243 - Jul 17, 20:55 UTCJul 17, 21:30 UTC35m
2026-07-17 EJA243 - Jul 17, 15:15 UTCJul 17, 19:30 UTC4h 15m
2026-07-16 EJA243 - Jul 16, 19:20 UTCJul 16, 19:35 UTC15m
2026-07-16 EJA243 - Jul 16, 16:55 UTCJul 16, 18:05 UTC1h 10m
2026-07-16 EJA243 SJC → SFO Jul 16, 14:55 UTCJul 16, 15:05 UTC10m
2026-06-23 EJA243 - Jun 23, 00:35 UTCJun 23, 01:10 UTC35m
2026-06-22 EJA243 - Jun 22, 19:34 UTCJun 22, 23:10 UTC3h 35m
2026-06-22 EJA243 TEB → ISW Jun 22, 16:29 UTCJun 22, 18:35 UTC2h 5m
2026-06-22 EJA243 BOS → TEB Jun 22, 00:50 UTCJun 22, 01:40 UTC50m
2026-06-21 EJA243 - Jun 21, 22:00 UTCJun 21, 23:50 UTC1h 50m
2026-06-21 EJA243 - Jun 21, 17:24 UTCJun 21, 18:39 UTC1h 15m
2026-06-20 EJA243 - Jun 20, 23:25 UTCJun 21, 01:25 UTC2h 0m
2026-06-20 EJA243 - Jun 20, 16:39 UTCJun 20, 17:49 UTC1h 10m
2026-06-19 EJA243 - Jun 19, 19:54 UTCJun 20, 00:19 UTC4h 25m
2026-06-18 EJA243 - Jun 18, 21:35 UTCJun 18, 22:05 UTC30m
2026-06-18 N243QS - Jun 18, 14:50 UTCJun 18, 20:55 UTC6h 5m
2026-06-18 EJA243 - Jun 18, 13:20 UTCJun 18, 13:40 UTC20m
2026-06-17 EJA243 BFI → LGB Jun 17, 21:15 UTCJun 17, 23:30 UTC2h 15m
2026-06-17 EJA243 - Jun 17, 17:35 UTCJun 17, 18:50 UTC1h 15m
2026-06-17 EJA243 FOK → BED Jun 17, 13:05 UTCJun 17, 16:25 UTC3h 20m
2026-06-16 EJA243 FOK → BED Jun 16, 19:19 UTCJun 16, 21:05 UTC1h 46m
2026-06-16 EJA243 FOK → BED Jun 16, 14:50 UTCJun 16, 15:45 UTC55m
2026-06-16 EJA243 FOK → BED Jun 16, 00:10 UTCJun 16, 01:00 UTC50m
2026-06-15 EJA243 FOK → BED Jun 15, 20:30 UTCJun 15, 21:14 UTC45m
2026-06-15 EJA243 FOK → BED Jun 15, 15:30 UTCJun 15, 16:45 UTC1h 15m
2026-06-15 EJA243 FOK → BED Jun 15, 14:00 UTCJun 15, 14:40 UTC40m
2026-06-14 EJA243 FOK → BED Jun 14, 22:05 UTCJun 14, 23:50 UTC1h 45m
2026-06-14 EJA243 FOK → BED Jun 14, 19:55 UTCJun 14, 20:40 UTC45m
2026-06-13 EJA243 FOK → BED Jun 13, 15:15 UTCJun 13, 15:45 UTC30m
2026-06-13 EJA243 FOK → BED Jun 13, 13:50 UTCJun 13, 14:25 UTC35m
2026-06-12 EJA243 FOK → BED Jun 12, 15:55 UTCJun 12, 19:05 UTC3h 10m
2026-06-12 EJA243 FOK → BED Jun 12, 13:35 UTCJun 12, 13:50 UTC15m
2026-06-09 EJA243 FOK → BED Jun 9, 14:40 UTCJun 9, 15:50 UTC1h 10m
2026-06-01 EJA243 FOK → BED Jun 1, 13:00 UTCJun 1, 13:35 UTC35m
2026-05-31 EJA243 FOK → BED May 31, 21:45 UTCJun 1, 00:40 UTC2h 55m
2026-05-31 EJA243 FOK → BED May 31, 18:30 UTCMay 31, 19:05 UTC35m
2026-05-31 EJA243 FOK → BED May 31, 16:40 UTCMay 31, 17:15 UTC35m

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 N243QS page for operator, model, and routing details .

Mode-S A23C93 frequently asked

What is Mode-S code A23C93?
A23C93 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N243QS.
Where is Mode-S A23C93 registered?
Mode-S code A23C93 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 A23C93 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 17:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23C93, octal 50436223, decimal 10,632,339.
What flights does A23C93 operate?
Mode-S A23C93 has broadcast 2 distinct callsigns, including EJA243, N243QS.