Apparatus

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sensors Mode-S transponder

A23A8E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N24251 · operated by CAREER TRACK 1 LLC

Hex
A23A8E
Octal
50435216
Decimal
10,631,822
Country
US
Tail
N24251
Type
C172
No current signal · last broadcast 10h ago
Flights observed
36
Distinct callsigns
1
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S A23A8E.

Country allocation

The ICAO 24-bit address A23A8E 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
CXK158 - 35 2026-05-30

Recent flights last 36

DateFlightRouteTakeoffLandingDuration
2026-05-30 CXK158 - May 30, 00:05 UTCMay 30, 00:45 UTC40m
2026-05-29 CXK158 - May 29, 21:40 UTCMay 29, 23:00 UTC1h 20m
2026-05-29 CXK158 - May 29, 14:10 UTCMay 29, 14:30 UTC20m
2026-05-29 CXK158 - May 29, 10:45 UTCMay 29, 12:45 UTC2h 0m
2026-05-29 - - May 29, 01:25 UTCMay 29, 02:00 UTC35m
2026-05-28 CXK158 - May 28, 23:10 UTCMay 28, 23:50 UTC40m
2026-05-28 CXK158 - May 28, 22:20 UTCMay 28, 22:30 UTC10m
2026-05-28 CXK158 - May 28, 20:30 UTCMay 28, 21:25 UTC55m
2026-05-28 CXK158 - May 28, 18:30 UTCMay 28, 18:50 UTC20m
2026-05-28 CXK158 - May 28, 16:00 UTCMay 28, 16:40 UTC40m
2026-05-28 CXK158 - May 28, 13:20 UTCMay 28, 15:10 UTC1h 50m
2026-05-28 CXK158 - May 28, 00:10 UTCMay 28, 01:10 UTC1h 0m
2026-05-27 CXK158 - May 27, 21:40 UTCMay 27, 23:05 UTC1h 25m
2026-05-26 CXK158 - May 26, 22:20 UTCMay 26, 22:54 UTC35m
2026-05-26 CXK158 - May 26, 21:20 UTCMay 26, 21:44 UTC25m
2026-05-26 CXK158 - May 26, 18:59 UTCMay 26, 20:20 UTC1h 20m
2026-05-26 CXK158 - May 26, 16:55 UTCMay 26, 17:55 UTC1h 0m
2026-05-26 CXK158 - May 26, 04:10 UTCMay 26, 05:45 UTC1h 35m
2026-05-25 CXK158 - May 25, 23:04 UTCMay 26, 00:39 UTC1h 35m
2026-05-22 CXK158 - May 22, 21:35 UTCMay 22, 23:00 UTC1h 25m
2026-05-22 CXK158 - May 22, 19:05 UTCMay 22, 19:20 UTC15m
2026-05-20 CXK158 SGR → SGR May 20, 23:00 UTCMay 20, 23:40 UTC40m
2026-05-20 CXK158 - May 20, 19:35 UTCMay 20, 19:55 UTC20m
2026-05-19 CXK158 - May 19, 21:50 UTCMay 19, 22:45 UTC55m
2026-05-19 CXK158 - May 19, 18:30 UTCMay 19, 20:00 UTC1h 30m
2026-05-18 CXK158 - May 18, 18:40 UTCMay 18, 19:40 UTC1h 0m
2026-04-29 CXK158 - Apr 29, 21:30 UTCApr 29, 22:20 UTC50m
2026-04-25 CXK158 - Apr 25, 21:00 UTCApr 25, 21:10 UTC10m
2026-04-25 CXK158 - Apr 25, 19:35 UTCApr 25, 19:50 UTC15m
2026-04-24 CXK158 - Apr 24, 21:30 UTCApr 24, 22:50 UTC1h 20m
2026-04-24 CXK158 SGR → SGR Apr 24, 19:15 UTCApr 24, 19:35 UTC20m
2026-04-22 CXK158 SGR → SGR Apr 22, 16:10 UTCApr 22, 17:20 UTC1h 10m
2026-04-18 CXK158 - Apr 18, 14:45 UTCApr 18, 16:30 UTC1h 45m
2026-04-18 CXK158 - Apr 18, 11:20 UTCApr 18, 12:55 UTC1h 35m
2026-04-16 CXK158 - Apr 16, 19:15 UTCApr 16, 20:20 UTC1h 5m
2026-04-13 CXK158 - Apr 13, 22:00 UTCApr 13, 22:25 UTC25m

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 N24251 page for operator, model, and routing details .

Mode-S A23A8E frequently asked

What is Mode-S code A23A8E?
A23A8E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N24251.
Where is Mode-S A23A8E registered?
Mode-S code A23A8E 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 A23A8E 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 A23A8E, octal 50435216, decimal 10,631,822.
What flights does A23A8E operate?
Mode-S A23A8E has broadcast 1 distinct callsign, including CXK158.