Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A239E3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24205 · operated by ATP AIRCRAFT 1 LLC

Hex
A239E3
Octal
50434743
Decimal
10,631,651
Country
US
Tail
N24205
Type
C172
No current signal · last broadcast 1d ago
Flights observed
188
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A239E3.

Country allocation

The ICAO 24-bit address A239E3 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 1 distinct

Callsign Airline Flights Last seen
CXK644 - 188 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 CXK644 - Jul 16, 16:40 UTCJul 16, 18:29 UTC1h 50m
2026-07-14 CXK644 - Jul 14, 20:45 UTCJul 14, 22:25 UTC1h 40m
2026-07-14 CXK644 - Jul 14, 15:40 UTCJul 14, 17:15 UTC1h 35m
2026-07-14 CXK644 - Jul 14, 13:40 UTCJul 14, 14:20 UTC40m
2026-07-14 CXK644 - Jul 14, 11:10 UTCJul 14, 12:45 UTC1h 35m
2026-07-13 CXK644 - Jul 13, 21:00 UTCJul 13, 22:35 UTC1h 35m
2026-07-10 CXK644 - Jul 10, 18:35 UTCJul 10, 19:35 UTC1h 0m
2026-07-09 CXK644 LUK → LUK Jul 9, 18:40 UTCJul 9, 20:45 UTC2h 5m
2026-07-09 CXK644 LUK → LUK Jul 9, 15:30 UTCJul 9, 17:35 UTC2h 5m
2026-07-09 CXK644 LUK → LUK Jul 9, 00:10 UTCJul 9, 01:30 UTC1h 20m
2026-07-08 CXK644 LUK → LUK Jul 8, 10:55 UTCJul 8, 13:50 UTC2h 55m
2026-07-07 CXK644 - Jul 7, 23:20 UTCJul 8, 00:00 UTC40m
2026-07-07 CXK644 - Jul 7, 20:30 UTCJul 7, 21:25 UTC55m
2026-07-07 CXK644 - Jul 7, 18:20 UTCJul 7, 19:05 UTC45m
2026-07-07 CXK644 - Jul 7, 13:50 UTCJul 7, 14:25 UTC35m
2026-07-07 CXK644 - Jul 7, 10:50 UTCJul 7, 11:45 UTC55m
2026-07-06 CXK644 LUK → LUK Jul 6, 23:50 UTCJul 7, 00:50 UTC1h 0m
2026-07-06 CXK644 LUK → LUK Jul 6, 18:55 UTCJul 6, 19:50 UTC55m
2026-07-06 CXK644 LUK → LUK Jul 6, 15:35 UTCJul 6, 18:00 UTC2h 25m
2026-07-06 CXK644 LUK → LUK Jul 6, 00:15 UTCJul 6, 01:40 UTC1h 25m
2026-07-05 CXK644 HAO → LUK Jul 5, 13:45 UTCJul 5, 14:00 UTC15m
2026-07-05 CXK644 LUK → HAO Jul 5, 10:55 UTCJul 5, 11:15 UTC20m
2026-07-04 CXK644 HAO → LUK Jul 4, 11:35 UTCJul 4, 12:25 UTC50m
2026-07-04 CXK644 LUK → HAO Jul 4, 10:15 UTCJul 4, 10:50 UTC35m
2026-07-03 CXK644 LUK → LUK Jul 3, 17:30 UTCJul 3, 18:35 UTC1h 5m
2026-07-03 CXK644 LUK → LUK Jul 3, 15:25 UTCJul 3, 16:00 UTC35m
2026-07-02 CXK644 LUK → LUK Jul 2, 22:00 UTCJul 2, 23:40 UTC1h 40m
2026-07-02 CXK644 - Jul 2, 19:25 UTCJul 2, 20:05 UTC40m
2026-07-02 CXK644 - Jul 2, 17:30 UTCJul 2, 18:35 UTC1h 5m
2026-07-02 CXK644 - Jul 2, 15:10 UTCJul 2, 15:55 UTC45m
2026-07-02 CXK644 LUK → LUK Jul 2, 02:10 UTCJul 2, 04:15 UTC2h 5m
2026-07-01 CXK644 LUK → LUK Jul 1, 15:20 UTCJul 1, 17:10 UTC1h 50m
2026-06-30 CXK644 LUK → LUK Jun 30, 23:40 UTCJul 1, 00:55 UTC1h 15m
2026-06-30 CXK644 LUK → LUK Jun 30, 19:10 UTCJun 30, 20:15 UTC1h 5m
2026-06-30 CXK644 LUK → LUK Jun 30, 16:45 UTCJun 30, 17:50 UTC1h 5m
2026-06-30 CXK644 - Jun 30, 13:50 UTCJun 30, 15:00 UTC1h 10m
2026-06-30 CXK644 - Jun 30, 12:45 UTCJun 30, 13:10 UTC25m
2026-06-29 CXK644 LUK → LUK Jun 29, 18:55 UTCJun 29, 19:54 UTC1h 0m
2026-06-29 CXK644 LUK → LUK Jun 29, 16:15 UTCJun 29, 17:34 UTC1h 20m
2026-06-29 CXK644 HAO → LUK Jun 29, 14:14 UTCJun 29, 15:19 UTC1h 5m
2026-06-29 CXK644 LUK → HAO Jun 29, 12:55 UTCJun 29, 13:34 UTC40m
2026-06-28 CXK644 LUK → LUK Jun 28, 18:49 UTCJun 28, 19:49 UTC1h 0m
2026-06-25 CXK644 LUK → LUK Jun 25, 14:44 UTCJun 25, 16:14 UTC1h 30m
2026-06-25 CXK644 LUK → LUK Jun 25, 12:10 UTCJun 25, 13:14 UTC1h 5m
2026-06-24 CXK644 LUK → LUK Jun 24, 17:20 UTCJun 24, 18:34 UTC1h 15m
2026-06-24 CXK644 LUK → LUK Jun 24, 12:54 UTCJun 24, 14:45 UTC1h 50m
2026-06-23 CXK644 LUK → LUK Jun 23, 23:55 UTCJun 24, 01:19 UTC1h 25m
2026-06-20 CXK644 LUK → LUK Jun 20, 09:49 UTCJun 20, 12:59 UTC3h 10m
2026-06-19 CXK644 LUK → LUK Jun 19, 14:54 UTCJun 19, 16:19 UTC1h 25m
2026-06-19 CXK644 - Jun 19, 10:50 UTCJun 19, 13:34 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 N24205 page for operator, model, and routing details .

Mode-S A239E3 frequently asked

What is Mode-S code A239E3?
A239E3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24205.
Where is Mode-S A239E3 registered?
Mode-S code A239E3 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 A239E3 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A239E3, octal 50434743, decimal 10,631,651.
What flights does A239E3 operate?
Mode-S A239E3 has broadcast 1 distinct callsign, including CXK644.