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sensors Mode-S transponder

ACD3A4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9254C · CESSNA 172 Skyhawk · operated by FLIGHT TRAINER LLC

Hex
ACD3A4
Octal
53151644
Decimal
11,326,372
Country
US
Tail
N9254C
Type
C172
No current signal · last broadcast Jul 25, 19:25 UTC
Flights observed
181
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 19:25 UTC

Last known position

Most recent position reported by Mode-S ACD3A4.

Country allocation

The ICAO 24-bit address ACD3A4 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
CXK609 - 181 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CXK609 - Jul 25, 17:55 UTCJul 25, 19:25 UTC1h 30m
2026-07-25 CXK609 - Jul 25, 15:25 UTCJul 25, 16:40 UTC1h 15m
2026-07-25 CXK609 - Jul 25, 14:15 UTCJul 25, 14:40 UTC25m
2026-07-25 CXK609 - Jul 25, 12:25 UTCJul 25, 12:50 UTC25m
2026-07-24 CXK609 - Jul 24, 20:20 UTCJul 24, 20:35 UTC15m
2026-07-24 CXK609 - Jul 24, 17:50 UTCJul 24, 18:15 UTC25m
2026-07-24 CXK609 - Jul 24, 14:45 UTCJul 24, 16:00 UTC1h 15m
2026-07-23 CXK609 - Jul 23, 19:25 UTCJul 23, 19:50 UTC25m
2026-07-23 CXK609 - Jul 23, 17:45 UTCJul 23, 18:05 UTC20m
2026-07-21 CXK609 - Jul 21, 21:45 UTCJul 21, 22:55 UTC1h 10m
2026-07-21 CXK609 - Jul 21, 20:20 UTCJul 21, 20:35 UTC15m
2026-07-21 CXK609 - Jul 21, 18:20 UTCJul 21, 18:55 UTC35m
2026-07-21 CXK609 - Jul 21, 13:40 UTCJul 21, 14:05 UTC25m
2026-07-21 CXK609 - Jul 21, 12:15 UTCJul 21, 12:45 UTC30m
2026-07-21 CXK609 - Jul 21, 01:10 UTCJul 21, 02:25 UTC1h 15m
2026-07-20 CXK609 - Jul 20, 15:15 UTCJul 20, 16:30 UTC1h 15m
2026-07-19 CXK609 - Jul 19, 19:05 UTCJul 19, 20:00 UTC55m
2026-07-19 CXK609 - Jul 19, 17:55 UTCJul 19, 18:05 UTC10m
2026-07-19 CXK609 - Jul 19, 15:50 UTCJul 19, 16:55 UTC1h 5m
2026-07-16 CXK609 - Jul 16, 18:44 UTCJul 16, 19:30 UTC45m
2026-07-16 CXK609 - Jul 16, 17:20 UTCJul 16, 18:05 UTC45m
2026-07-16 CXK609 OGD → OGD Jul 16, 14:45 UTCJul 16, 15:49 UTC1h 5m
2026-07-16 CXK609 - Jul 16, 01:30 UTCJul 16, 03:15 UTC1h 45m
2026-07-15 CXK609 OGD → OGD Jul 15, 22:50 UTCJul 16, 00:40 UTC1h 50m
2026-07-15 CXK609 - Jul 15, 19:05 UTCJul 15, 19:50 UTC45m
2026-07-15 CXK609 OGD → OGD Jul 15, 15:40 UTCJul 15, 16:50 UTC1h 10m
2026-07-15 CXK609 - Jul 15, 01:45 UTCJul 15, 02:30 UTC45m
2026-07-14 CXK609 OGD → OGD Jul 14, 20:10 UTCJul 14, 21:35 UTC1h 25m
2026-07-14 CXK609 OGD → OGD Jul 14, 14:25 UTCJul 14, 16:10 UTC1h 45m
2026-07-13 CXK609 - Jul 13, 19:55 UTCJul 13, 20:35 UTC40m
2026-07-13 CXK609 - Jul 13, 17:30 UTCJul 13, 18:20 UTC50m
2026-07-11 CXK609 VGT → VGT Jul 11, 12:50 UTCJul 11, 15:30 UTC2h 40m
2026-07-07 CXK609 VGT → VGT Jul 7, 17:50 UTCJul 7, 18:50 UTC1h 0m
2026-07-06 CXK609 - Jul 6, 17:10 UTCJul 6, 17:50 UTC40m
2026-07-06 CXK609 - Jul 6, 15:25 UTCJul 6, 16:05 UTC40m
2026-07-06 CXK609 VGT → VGT Jul 6, 12:40 UTCJul 6, 13:55 UTC1h 15m
2026-07-05 CXK609 - Jul 5, 16:05 UTCJul 5, 16:50 UTC45m
2026-07-05 CXK609 - Jul 5, 13:35 UTCJul 5, 14:45 UTC1h 10m
2026-07-05 CXK609 VGT → VGT Jul 5, 13:05 UTCJul 5, 13:20 UTC15m
2026-07-04 CXK609 VGT → VGT Jul 4, 17:15 UTCJul 4, 18:55 UTC1h 40m
2026-07-04 CXK609 - Jul 4, 15:15 UTCJul 4, 16:05 UTC50m
2026-07-04 CXK609 - Jul 4, 13:25 UTCJul 4, 14:25 UTC1h 0m
2026-07-04 CXK609 VGT → VGT Jul 4, 12:50 UTCJul 4, 13:10 UTC20m
2026-07-02 CXK609 VGT → VGT Jul 2, 14:55 UTCJul 2, 16:40 UTC1h 45m
2026-07-01 CXK609 VGT → VGT Jul 1, 20:10 UTCJul 1, 21:10 UTC1h 0m
2026-07-01 CXK609 - Jul 1, 16:35 UTCJul 1, 17:25 UTC50m
2026-07-01 CXK609 - Jul 1, 14:40 UTCJul 1, 15:55 UTC1h 15m
2026-07-01 CXK609 - Jul 1, 13:00 UTCJul 1, 13:20 UTC20m
2026-07-01 CXK609 VGT → VGT Jul 1, 12:10 UTCJul 1, 12:55 UTC45m
2026-06-30 CXK609 VGT → VGT Jun 30, 21:35 UTCJun 30, 22:25 UTC50m

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 N9254C page for operator, model, and routing details .

Mode-S ACD3A4 frequently asked

What is Mode-S code ACD3A4?
ACD3A4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9254C.
Where is Mode-S ACD3A4 registered?
Mode-S code ACD3A4 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 ACD3A4 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 19:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACD3A4, octal 53151644, decimal 11,326,372.
What flights does ACD3A4 operate?
Mode-S ACD3A4 has broadcast 1 distinct callsign, including CXK609.