Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ACA20C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N913CK · LEARJET 35 · operated by KALITTA CHARTERS LLC

Hex
ACA20C
Octal
53121014
Decimal
11,313,676
Country
US
Tail
N913CK
Type
LJ35
No current signal · last broadcast 5d ago
Flights observed
93
Distinct callsigns
6
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S ACA20C.

Country allocation

The ICAO 24-bit address ACA20C 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 6 distinct

Callsign Airline Flights Last seen
KFS161 Kalitta Charters 30 2026-06-16
KFS198 Kalitta Charters 24 2026-06-01
KFS150 - 21 2026-07-15
KFS169 Kalitta Charters 12 2026-06-24
KFS23 Kalitta Charters 3 2026-07-23
KFS123 - 3 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 KFS23 PHL → BDL Jul 23, 21:00 UTCJul 23, 21:40 UTC40m
2026-07-23 KFS23 PHL → BDL Jul 23, 17:05 UTCJul 23, 19:45 UTC2h 40m
2026-07-23 KFS23 PHL → BDL Jul 23, 13:05 UTCJul 23, 15:25 UTC2h 20m
2026-07-18 KFS123 - Jul 18, 17:10 UTCJul 18, 19:55 UTC2h 45m
2026-07-18 KFS123 - Jul 18, 14:45 UTCJul 18, 16:10 UTC1h 25m
2026-07-15 KFS123 - Jul 15, 19:25 UTCJul 15, 20:55 UTC1h 30m
2026-07-15 KFS150 - Jul 15, 14:10 UTCJul 15, 15:40 UTC1h 30m
2026-07-11 KFS150 - Jul 11, 22:10 UTCJul 11, 22:40 UTC30m
2026-07-11 KFS150 - Jul 11, 20:10 UTCJul 11, 20:35 UTC25m
2026-07-10 KFS150 - Jul 10, 19:45 UTCJul 10, 20:20 UTC35m
2026-07-10 KFS150 - Jul 10, 17:40 UTCJul 10, 18:10 UTC30m
2026-07-08 KFS150 - Jul 8, 23:20 UTCJul 8, 23:50 UTC30m
2026-07-08 KFS150 - Jul 8, 21:05 UTCJul 8, 21:35 UTC30m
2026-07-06 KFS150 - Jul 6, 01:00 UTCJul 6, 01:40 UTC40m
2026-07-05 KFS150 - Jul 5, 23:05 UTCJul 5, 23:45 UTC40m
2026-07-05 KFS150 - Jul 5, 19:45 UTCJul 5, 20:15 UTC30m
2026-07-05 KFS150 - Jul 5, 17:10 UTCJul 5, 17:30 UTC20m
2026-07-04 KFS150 - Jul 4, 00:00 UTCJul 4, 00:30 UTC30m
2026-07-03 KFS150 - Jul 3, 21:50 UTCJul 3, 22:20 UTC30m
2026-07-02 KFS150 - Jul 2, 03:30 UTCJul 2, 04:00 UTC30m
2026-07-02 KFS150 - Jul 2, 00:45 UTCJul 2, 01:20 UTC35m
2026-07-01 KFS150 - Jul 1, 23:10 UTCJul 1, 23:50 UTC40m
2026-07-01 KFS150 - Jul 1, 20:50 UTCJul 1, 21:20 UTC30m
2026-07-01 KFS150 - Jul 1, 03:10 UTCJul 1, 03:40 UTC30m
2026-07-01 KFS150 - Jul 1, 00:40 UTCJul 1, 01:10 UTC30m
2026-06-28 KFS150 - Jun 28, 23:20 UTCJun 29, 00:05 UTC45m
2026-06-28 KFS150 - Jun 28, 20:34 UTCJun 28, 21:24 UTC50m
2026-06-24 KFS169 JFK → BED Jun 24, 02:24 UTCJun 24, 02:40 UTC15m
2026-06-24 KFS169 JFK → BED Jun 24, 00:20 UTCJun 24, 00:40 UTC20m
2026-06-23 KFS169 JFK → BED Jun 23, 05:04 UTCJun 23, 05:24 UTC20m
2026-06-23 KFS169 JFK → BED Jun 23, 02:34 UTCJun 23, 03:00 UTC25m
2026-06-22 KFS169 JFK → BED Jun 22, 04:34 UTCJun 22, 05:04 UTC30m
2026-06-22 KFS169 JFK → BED Jun 22, 02:25 UTCJun 22, 02:54 UTC30m
2026-06-21 KFS169 JFK → BED Jun 21, 21:44 UTCJun 21, 22:34 UTC50m
2026-06-21 KFS169 JFK → BED Jun 21, 18:54 UTCJun 21, 19:34 UTC40m
2026-06-21 KFS169 JFK → BED Jun 21, 04:30 UTCJun 21, 05:04 UTC35m
2026-06-21 KFS169 JFK → BED Jun 21, 02:20 UTCJun 21, 03:00 UTC40m
2026-06-20 KFS169 JFK → BED Jun 20, 03:44 UTCJun 20, 04:20 UTC35m
2026-06-20 KFS169 JFK → BED Jun 20, 00:49 UTCJun 20, 01:29 UTC40m
2026-06-16 KFS161 PHL → YIP Jun 16, 04:05 UTCJun 16, 04:35 UTC30m
2026-06-16 KFS161 PHL → YIP Jun 16, 01:40 UTCJun 16, 02:09 UTC30m
2026-06-13 KFS161 PHL → YIP Jun 13, 02:00 UTCJun 13, 02:30 UTC30m
2026-06-13 KFS161 PHL → YIP Jun 13, 00:00 UTCJun 13, 00:30 UTC30m
2026-06-12 KFS161 PHL → YIP Jun 12, 14:30 UTCJun 12, 16:00 UTC1h 30m
2026-06-11 KFS161 PHL → YIP Jun 11, 22:10 UTCJun 11, 23:20 UTC1h 10m
2026-06-11 KFS161 PHL → YIP Jun 11, 20:10 UTCJun 11, 20:50 UTC40m
2026-06-11 KFS161 PHL → YIP Jun 11, 15:55 UTCJun 11, 18:05 UTC2h 10m
2026-06-10 KFS161 PHL → YIP Jun 10, 22:10 UTCJun 11, 00:00 UTC1h 50m
2026-06-10 KFS161 PHL → YIP Jun 10, 15:50 UTCJun 10, 18:00 UTC2h 10m
2026-06-08 KFS161 PHL → YIP Jun 8, 16:15 UTCJun 8, 19:00 UTC2h 45m

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 N913CK page for operator, model, and routing details .

Mode-S ACA20C frequently asked

What is Mode-S code ACA20C?
ACA20C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N913CK.
Where is Mode-S ACA20C registered?
Mode-S code ACA20C 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 ACA20C broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACA20C, octal 53121014, decimal 11,313,676.
What flights does ACA20C operate?
Mode-S ACA20C has broadcast 6 distinct callsigns, including KFS161, KFS198, KFS150, KFS169, KFS23.