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
No current signal · last broadcast 10h ago
Flights observed
95
Distinct callsigns
9
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S A2303B.

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 9 distinct

Callsign Airline Flights Last seen
KFS91 Kalitta Charters 35 2026-07-22
KFS88 - 14 2026-07-01
KFS21 - 14 2026-06-26
KFS51 Kalitta Charters 12 2026-06-11
KFS65 Kalitta Charters 10 2026-06-16
KFS96 - 3 2026-07-04
KFS57 Kalitta Charters 3 2026-06-13
KFS20 Kalitta Charters 2 2026-04-20
KFS100 Kalitta Charters 2 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 KFS91 YIP → MMU Jul 22, 21:30 UTCJul 22, 22:05 UTC35m
2026-07-22 KFS91 YIP → MMU Jul 22, 19:05 UTCJul 22, 20:55 UTC1h 50m
2026-07-22 KFS91 YIP → MMU Jul 22, 11:10 UTCJul 22, 12:15 UTC1h 5m
2026-07-20 KFS91 YIP → MMU Jul 20, 21:20 UTCJul 20, 23:05 UTC1h 45m
2026-07-20 KFS91 YIP → MMU Jul 20, 15:30 UTCJul 20, 16:05 UTC35m
2026-07-20 KFS91 YIP → MMU Jul 20, 13:35 UTCJul 20, 14:10 UTC35m
2026-07-19 KFS91 YIP → MMU Jul 19, 20:45 UTCJul 19, 21:10 UTC25m
2026-07-19 KFS91 YIP → MMU Jul 19, 15:00 UTCJul 19, 15:25 UTC25m
2026-07-19 KFS91 YIP → MMU Jul 19, 13:20 UTCJul 19, 13:50 UTC30m
2026-07-18 KFS91 YIP → MMU Jul 18, 18:40 UTCJul 18, 20:05 UTC1h 25m
2026-07-18 KFS91 YIP → MMU Jul 18, 12:30 UTCJul 18, 12:55 UTC25m
2026-07-18 KFS91 YIP → MMU Jul 18, 10:55 UTCJul 18, 11:35 UTC40m
2026-07-05 KFS91 - Jul 5, 10:20 UTCJul 5, 11:20 UTC1h 0m
2026-07-05 KFS91 - Jul 5, 08:40 UTCJul 5, 09:35 UTC55m
2026-07-05 KFS91 - Jul 5, 07:35 UTCJul 5, 07:45 UTC10m
2026-07-04 KFS96 - Jul 4, 18:45 UTCJul 4, 19:10 UTC25m
2026-07-04 KFS96 - Jul 4, 17:40 UTCJul 4, 18:00 UTC20m
2026-07-04 KFS96 - Jul 4, 13:10 UTCJul 4, 13:25 UTC15m
2026-07-01 KFS88 - Jul 1, 18:30 UTCJul 1, 19:00 UTC30m
2026-07-01 KFS88 - Jul 1, 17:05 UTCJul 1, 17:55 UTC50m
2026-07-01 KFS88 - Jul 1, 13:20 UTCJul 1, 16:15 UTC2h 55m
2026-06-30 KFS88 - Jun 30, 18:05 UTCJun 30, 19:10 UTC1h 5m
2026-06-30 KFS88 - Jun 30, 16:50 UTCJun 30, 17:20 UTC30m
2026-06-30 KFS88 - Jun 30, 14:25 UTCJun 30, 16:10 UTC1h 45m
2026-06-30 KFS88 - Jun 30, 11:55 UTCJun 30, 13:25 UTC1h 30m
2026-06-30 KFS88 - Jun 30, 09:00 UTCJun 30, 11:10 UTC2h 10m
2026-06-29 KFS91 TPA → YIP Jun 29, 18:25 UTCJun 29, 20:44 UTC2h 20m
2026-06-29 KFS91 - Jun 29, 14:34 UTCJun 29, 16:25 UTC1h 50m
2026-06-29 KFS91 - Jun 29, 13:19 UTCJun 29, 13:49 UTC30m
2026-06-26 KFS21 - Jun 26, 16:09 UTCJun 26, 18:04 UTC1h 55m
2026-06-25 KFS21 - Jun 25, 18:45 UTCJun 25, 20:25 UTC1h 40m
2026-06-25 KFS21 - Jun 25, 14:50 UTCJun 25, 17:20 UTC2h 30m
2026-06-25 KFS21 - Jun 25, 13:00 UTCJun 25, 13:40 UTC40m
2026-06-25 KFS21 - Jun 25, 11:35 UTCJun 25, 12:25 UTC50m
2026-06-24 KFS21 SDF → YIP Jun 24, 18:15 UTCJun 24, 19:10 UTC55m
2026-06-23 KFS21 SDF → YIP Jun 23, 17:15 UTCJun 23, 17:44 UTC30m
2026-06-23 KFS21 SDF → YIP Jun 23, 15:19 UTCJun 23, 16:35 UTC1h 15m
2026-06-23 KFS21 SDF → YIP Jun 23, 13:55 UTCJun 23, 14:39 UTC45m
2026-06-23 KFS21 SDF → YIP Jun 23, 11:14 UTCJun 23, 13:00 UTC1h 45m
2026-06-23 KFS21 SDF → YIP Jun 23, 09:09 UTCJun 23, 10:19 UTC1h 10m
2026-06-21 KFS91 YIP → MMU Jun 21, 21:24 UTCJun 21, 22:00 UTC35m
2026-06-21 KFS91 YIP → MMU Jun 21, 16:10 UTCJun 21, 16:39 UTC30m
2026-06-16 KFS65 PTK → NEW Jun 16, 20:20 UTCJun 16, 21:15 UTC55m
2026-06-16 KFS65 PTK → NEW Jun 16, 17:19 UTCJun 16, 19:05 UTC1h 45m
2026-06-16 KFS65 PTK → NEW Jun 16, 12:20 UTCJun 16, 14:35 UTC2h 15m
2026-06-16 KFS65 PTK → NEW Jun 16, 10:25 UTCJun 16, 11:15 UTC50m
2026-06-13 KFS57 MDW → BKL Jun 13, 19:15 UTCJun 13, 22:30 UTC3h 15m
2026-06-13 KFS57 MDW → BKL Jun 13, 15:10 UTCJun 13, 17:40 UTC2h 30m
2026-06-12 KFS57 MDW → BKL Jun 12, 21:00 UTCJun 12, 21:25 UTC25m
2026-06-11 KFS51 SUS → TUS Jun 11, 23:30 UTCJun 12, 00:10 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 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?
No active broadcast right now. Last signal was 10h ago.
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 9 distinct callsigns, including KFS91, KFS88, KFS21, KFS51, KFS65.