Apparatus

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sensors Mode-S transponder

A2303B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N240CK · DASSAULT Falcon 200 · operated by KALITTA CHARTERS LLC

Hex
A2303B
Octal
50430073
Decimal
10,629,179
Country
US
Tail
N240CK
Type
FA20
Broadcasting now · callsign KFS51 · 8,875 ft
Flights observed
36
Distinct callsigns
7
Country
US
Last broadcast
2d ago

Current position

A2303B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2303B 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 7 distinct

Callsign Airline Flights Last seen
KFS91 Kalitta Charters 15 2026-06-04
KFS88 Kalitta Charters 6 2026-05-06
KFS65 Kalitta Charters 6 2026-06-01
KFS21 Kalitta Charters 3 2026-05-30
KFS51 Kalitta Charters 2 2026-06-05
KFS20 Kalitta Charters 2 2026-04-20
KFS100 Kalitta Charters 2 2026-05-25

Recent flights last 36

DateFlightRouteTakeoffLandingDuration
2026-06-05 KFS51 SUS → TUS Jun 5, 20:00 UTCJun 5, 20:35 UTC35m
2026-06-05 KFS51 SUS → TUS Jun 5, 14:30 UTCJun 5, 14:55 UTC25m
2026-06-04 KFS91 YIP → MMU Jun 4, 05:10 UTCJun 4, 05:20 UTC10m
2026-06-04 KFS91 YIP → MMU Jun 4, 03:00 UTCJun 4, 04:15 UTC1h 15m
2026-06-03 KFS91 YIP → MMU Jun 3, 20:50 UTCJun 3, 22:05 UTC1h 15m
2026-06-03 KFS91 YIP → MMU Jun 3, 19:30 UTCJun 3, 19:40 UTC10m
2026-06-01 KFS65 PTK → NEW Jun 1, 15:25 UTCJun 1, 16:50 UTC1h 25m
2026-06-01 KFS65 PTK → NEW Jun 1, 12:55 UTCJun 1, 13:55 UTC1h 0m
2026-06-01 KFS65 PTK → NEW Jun 1, 11:50 UTCJun 1, 12:20 UTC30m
2026-06-01 KFS91 YIP → MMU Jun 1, 04:55 UTCJun 1, 06:40 UTC1h 45m
2026-05-31 KFS91 YIP → MMU May 31, 21:20 UTCMay 31, 22:00 UTC40m
2026-05-31 KFS91 YIP → MMU May 31, 19:25 UTCMay 31, 20:05 UTC40m
2026-05-30 KFS21 SDF → YIP May 30, 17:55 UTCMay 30, 21:15 UTC3h 20m
2026-05-27 KFS21 SDF → YIP May 27, 18:45 UTCMay 27, 21:35 UTC2h 50m
2026-05-27 KFS21 SDF → YIP May 27, 16:35 UTCMay 27, 16:45 UTC10m
2026-05-25 KFS100 GCM → OPF May 25, 21:35 UTCMay 25, 21:54 UTC20m
2026-05-25 KFS100 GCM → OPF May 25, 20:24 UTCMay 25, 21:04 UTC40m
2026-05-25 KFS91 YIP → MMU May 25, 18:20 UTCMay 25, 18:55 UTC35m
2026-05-17 KFS65 PTK → NEW May 17, 05:05 UTCMay 17, 05:40 UTC35m
2026-05-17 KFS65 PTK → NEW May 17, 03:15 UTCMay 17, 04:05 UTC50m
2026-05-17 KFS65 PTK → NEW May 17, 00:35 UTCMay 17, 01:25 UTC50m
2026-05-06 KFS88 TEB → YIP May 6, 20:45 UTCMay 6, 22:35 UTC1h 50m
2026-05-06 KFS88 TEB → YIP May 6, 18:55 UTCMay 6, 19:55 UTC1h 0m
2026-05-06 KFS88 TEB → YIP May 6, 15:10 UTCMay 6, 16:55 UTC1h 45m
2026-05-06 KFS88 TEB → YIP May 6, 12:55 UTCMay 6, 14:20 UTC1h 25m
2026-05-06 KFS88 TEB → YIP May 6, 11:30 UTCMay 6, 12:01 UTC30m
2026-05-05 KFS88 TEB → YIP May 5, 20:01 UTCMay 5, 22:15 UTC2h 15m
2026-04-25 KFS91 YIP → MMU Apr 25, 01:25 UTCApr 25, 02:40 UTC1h 15m
2026-04-24 KFS91 YIP → MMU Apr 24, 18:45 UTCApr 24, 19:45 UTC1h 0m
2026-04-24 KFS91 YIP → MMU Apr 24, 17:00 UTCApr 24, 17:40 UTC40m
2026-04-23 KFS91 YIP → MMU Apr 23, 18:35 UTCApr 23, 19:25 UTC50m
2026-04-23 KFS91 YIP → MMU Apr 23, 16:40 UTCApr 23, 17:55 UTC1h 14m
2026-04-23 KFS91 YIP → MMU Apr 23, 15:05 UTCApr 23, 15:50 UTC45m
2026-04-23 KFS91 YIP → MMU Apr 23, 13:55 UTCApr 23, 14:35 UTC40m
2026-04-20 KFS20 YIP → LAS Apr 20, 17:20 UTCApr 20, 18:00 UTC40m
2026-04-20 KFS20 YIP → LAS Apr 20, 13:05 UTCApr 20, 14:00 UTC55m

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 N240CK page for operator, model, and routing details .

Mode-S A2303B frequently asked

What is Mode-S code A2303B?
A2303B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N240CK.
Where is Mode-S A2303B registered?
Mode-S code A2303B 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 A2303B broadcasting right now?
Yes. Mode-S A2303B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2303B, octal 50430073, decimal 10,629,179.
What flights does A2303B operate?
Mode-S A2303B has broadcast 7 distinct callsigns, including KFS91, KFS88, KFS65, KFS21, KFS51.