Apparatus

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sensors Mode-S transponder

A25E18

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N25139 · operated by CAREER TRACK 4 LLC

Hex
A25E18
Octal
50457030
Decimal
10,640,920
Country
US
Tail
N25139
Type
C172
No current signal · last broadcast 7h ago
Flights observed
177
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A25E18.

Country allocation

The ICAO 24-bit address A25E18 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
CXK192 - 177 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CXK192 - Jul 17, 22:40 UTCJul 17, 23:20 UTC40m
2026-07-17 CXK192 - Jul 17, 21:10 UTCJul 17, 22:05 UTC55m
2026-07-17 CXK192 - Jul 17, 19:30 UTCJul 17, 20:29 UTC1h 0m
2026-07-17 CXK192 - Jul 17, 17:30 UTCJul 17, 18:34 UTC1h 5m
2026-07-15 CXK192 - Jul 15, 13:20 UTCJul 15, 15:30 UTC2h 10m
2026-07-14 CXK192 - Jul 14, 14:10 UTCJul 14, 16:05 UTC1h 55m
2026-07-14 CXK192 FTW → FTW Jul 14, 12:40 UTCJul 14, 13:15 UTC35m
2026-07-14 CXK192 FTW → FTW Jul 14, 11:30 UTCJul 14, 11:50 UTC20m
2026-07-11 CXK192 FTW → FTW Jul 11, 12:05 UTCJul 11, 13:05 UTC1h 0m
2026-07-11 CXK192 FTW → FTW Jul 11, 11:15 UTCJul 11, 11:30 UTC15m
2026-07-10 CXK192 - Jul 10, 19:40 UTCJul 10, 20:45 UTC1h 5m
2026-07-09 CXK192 - Jul 9, 13:05 UTCJul 9, 14:30 UTC1h 25m
2026-07-09 CXK192 FTW → FTW Jul 9, 11:15 UTCJul 9, 12:25 UTC1h 10m
2026-07-08 CXK192 - Jul 8, 19:05 UTCJul 8, 20:50 UTC1h 45m
2026-07-08 CXK192 - Jul 8, 16:30 UTCJul 8, 18:05 UTC1h 35m
2026-07-08 CXK192 - Jul 8, 13:20 UTCJul 8, 15:45 UTC2h 25m
2026-07-08 CXK192 FTW → FTW Jul 8, 11:45 UTCJul 8, 12:30 UTC45m
2026-07-07 CXK192 - Jul 7, 19:15 UTCJul 7, 19:50 UTC35m
2026-07-07 CXK192 FTW → FTW Jul 7, 16:55 UTCJul 7, 17:55 UTC1h 0m
2026-07-07 CXK192 - Jul 7, 15:40 UTCJul 7, 16:05 UTC25m
2026-07-07 CXK192 - Jul 7, 12:10 UTCJul 7, 13:10 UTC1h 0m
2026-07-06 CXK192 FTW → FTW Jul 6, 20:00 UTCJul 6, 20:40 UTC40m
2026-07-06 CXK192 - Jul 6, 17:05 UTCJul 6, 17:25 UTC20m
2026-07-06 CXK192 - Jul 6, 14:00 UTCJul 6, 14:05 UTC5m
2026-07-06 CXK192 - Jul 6, 13:35 UTCJul 6, 13:45 UTC10m
2026-07-06 CXK192 - Jul 6, 11:50 UTCJul 6, 12:00 UTC10m
2026-07-03 CXK192 - Jul 3, 14:20 UTCJul 3, 14:25 UTC5m
2026-07-03 CXK192 - Jul 3, 13:30 UTCJul 3, 13:40 UTC10m
2026-07-03 CXK192 - Jul 3, 13:00 UTCJul 3, 13:15 UTC15m
2026-07-02 CXK192 - Jul 2, 17:50 UTCJul 2, 18:30 UTC40m
2026-07-02 CXK192 - Jul 2, 15:55 UTCJul 2, 16:00 UTC5m
2026-07-02 CXK192 - Jul 2, 15:30 UTCJul 2, 15:40 UTC10m
2026-07-02 CXK192 - Jul 2, 15:10 UTCJul 2, 15:15 UTC5m
2026-07-02 CXK192 - Jul 2, 14:45 UTCJul 2, 14:50 UTC5m
2026-07-02 CXK192 - Jul 2, 12:30 UTCJul 2, 12:35 UTC5m
2026-07-02 CXK192 - Jul 2, 11:15 UTCJul 2, 11:25 UTC10m
2026-07-02 CXK192 - Jul 2, 11:05 UTCJul 2, 11:10 UTC5m
2026-07-01 CXK192 - Jul 1, 21:05 UTCJul 1, 23:10 UTC2h 5m
2026-07-01 CXK192 - Jul 1, 13:30 UTCJul 1, 14:50 UTC1h 20m
2026-06-30 CXK192 - Jun 30, 20:00 UTCJun 30, 21:30 UTC1h 30m
2026-06-30 CXK192 - Jun 30, 15:15 UTCJun 30, 16:40 UTC1h 25m
2026-06-25 CXK192 - Jun 25, 21:25 UTCJun 25, 22:04 UTC40m
2026-06-25 CXK192 - Jun 25, 20:39 UTCJun 25, 20:54 UTC15m
2026-06-25 CXK192 - Jun 25, 17:44 UTCJun 25, 19:44 UTC2h 0m
2026-06-25 CXK192 - Jun 25, 15:50 UTCJun 25, 16:39 UTC50m
2026-06-25 CXK192 - Jun 25, 13:59 UTCJun 25, 15:10 UTC1h 10m
2026-06-24 CXK192 - Jun 24, 21:24 UTCJun 24, 22:45 UTC1h 20m
2026-06-24 CXK192 - Jun 24, 20:09 UTCJun 24, 20:30 UTC20m
2026-06-24 CXK192 - Jun 24, 18:39 UTCJun 24, 19:15 UTC35m
2026-06-24 CXK192 - Jun 24, 16:54 UTCJun 24, 17:14 UTC20m

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 N25139 page for operator, model, and routing details .

Mode-S A25E18 frequently asked

What is Mode-S code A25E18?
A25E18 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N25139.
Where is Mode-S A25E18 registered?
Mode-S code A25E18 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 A25E18 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25E18, octal 50457030, decimal 10,640,920.
What flights does A25E18 operate?
Mode-S A25E18 has broadcast 1 distinct callsign, including CXK192.