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sensors Mode-S transponder

A4F825

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N41912 · CESSNA 172R Cutlass RG · operated by EASTERN KENTUCKY UNIVERSITY

Hex
A4F825
Octal
51174045
Decimal
10,811,429
Country
US
Tail
N41912
Type
C72R
No current signal · last broadcast 15d ago
Flights observed
148
Distinct callsigns
1
Country
US
Last broadcast
15d ago

Last known position

Most recent position reported by Mode-S A4F825.

Country allocation

The ICAO 24-bit address A4F825 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
N41912 - 147 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N41912 - Jul 25, 18:50 UTCJul 25, 21:25 UTC2h 35m
2026-07-25 N41912 - Jul 25, 13:50 UTCJul 25, 16:20 UTC2h 30m
2026-07-24 N41912 - Jul 24, 19:35 UTCJul 24, 21:00 UTC1h 25m
2026-07-24 N41912 - Jul 24, 16:55 UTCJul 24, 18:25 UTC1h 30m
2026-07-24 N41912 - Jul 24, 14:40 UTCJul 24, 15:40 UTC1h 0m
2026-07-24 N41912 - Jul 24, 12:05 UTCJul 24, 13:20 UTC1h 15m
2026-07-24 N41912 - Jul 24, 01:50 UTCJul 24, 03:25 UTC1h 35m
2026-07-23 N41912 - Jul 23, 19:10 UTCJul 23, 20:45 UTC1h 35m
2026-07-23 N41912 - Jul 23, 13:00 UTCJul 23, 14:30 UTC1h 30m
2026-07-23 N41912 - Jul 23, 00:25 UTCJul 23, 01:20 UTC55m
2026-07-22 N41912 - Jul 22, 22:00 UTCJul 22, 22:45 UTC45m
2026-07-22 N41912 - Jul 22, 17:10 UTCJul 22, 18:45 UTC1h 35m
2026-07-20 N41912 - Jul 20, 22:45 UTCJul 20, 23:15 UTC30m
2026-07-20 N41912 - Jul 20, 20:35 UTCJul 20, 20:45 UTC10m
2026-07-20 N41912 - Jul 20, 19:10 UTCJul 20, 19:45 UTC35m
2026-07-20 N41912 - Jul 20, 17:50 UTCJul 20, 18:05 UTC15m
2026-07-18 N41912 - Jul 18, 16:05 UTCJul 18, 16:15 UTC10m
2026-07-17 N41912 - Jul 17, 14:39 UTCJul 17, 15:29 UTC50m
2026-07-17 N41912 - Jul 17, 11:35 UTCJul 17, 13:40 UTC2h 5m
2026-07-16 N41912 - Jul 16, 22:40 UTCJul 16, 23:05 UTC25m
2026-07-16 N41912 - Jul 16, 18:15 UTCJul 16, 19:14 UTC1h 0m
2026-07-16 N41912 - Jul 16, 14:35 UTCJul 16, 15:25 UTC50m
2026-07-16 N41912 - Jul 16, 00:15 UTCJul 16, 00:45 UTC30m
2026-07-15 N41912 - Jul 15, 23:30 UTCJul 15, 23:40 UTC10m
2026-07-15 N41912 - Jul 15, 22:00 UTCJul 15, 23:00 UTC1h 0m
2026-07-14 N41912 - Jul 14, 15:05 UTCJul 14, 16:00 UTC55m
2026-07-14 N41912 - Jul 14, 01:10 UTCJul 14, 03:30 UTC2h 20m
2026-07-09 N41912 - Jul 9, 19:55 UTCJul 9, 20:25 UTC30m
2026-07-08 N41912 - Jul 8, 15:30 UTCJul 8, 15:45 UTC15m
2026-07-07 N41912 - Jul 7, 13:30 UTCJul 7, 14:10 UTC40m
2026-07-07 N41912 - Jul 7, 11:45 UTCJul 7, 12:30 UTC45m
2026-07-02 N41912 - Jul 2, 15:20 UTCJul 2, 15:45 UTC25m
2026-07-02 N41912 - Jul 2, 12:40 UTCJul 2, 13:40 UTC1h 0m
2026-07-02 N41912 - Jul 2, 00:25 UTCJul 2, 00:40 UTC15m
2026-07-01 N41912 - Jul 1, 23:35 UTCJul 1, 23:50 UTC15m
2026-07-01 N41912 - Jul 1, 21:10 UTCJul 1, 22:25 UTC1h 15m
2026-07-01 N41912 - Jul 1, 11:45 UTCJul 1, 14:00 UTC2h 15m
2026-06-30 N41912 - Jun 30, 22:00 UTCJun 30, 22:40 UTC40m
2026-06-30 N41912 - Jun 30, 15:35 UTCJun 30, 17:55 UTC2h 20m
2026-06-30 N41912 - Jun 30, 02:55 UTCJun 30, 04:05 UTC1h 10m
2026-06-30 N41912 - Jun 30, 00:09 UTCJun 30, 01:19 UTC1h 10m
2026-06-29 N41912 - Jun 29, 22:05 UTCJun 29, 23:14 UTC1h 10m
2026-06-29 N41912 - Jun 29, 18:14 UTCJun 29, 19:05 UTC50m
2026-06-29 N41912 - Jun 29, 13:54 UTCJun 29, 14:19 UTC25m
2026-06-25 N41912 - Jun 25, 17:49 UTCJun 25, 18:24 UTC35m
2026-06-25 N41912 - Jun 25, 15:10 UTCJun 25, 15:20 UTC10m
2026-06-24 N41912 - Jun 24, 22:29 UTCJun 24, 23:34 UTC1h 5m
2026-06-24 N41912 - Jun 24, 19:15 UTCJun 24, 20:09 UTC55m
2026-06-24 N41912 - Jun 24, 17:25 UTCJun 24, 17:55 UTC30m
2026-06-24 N41912 - Jun 24, 11:54 UTCJun 24, 12:40 UTC45m

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 N41912 page for operator, model, and routing details .

Mode-S A4F825 frequently asked

What is Mode-S code A4F825?
A4F825 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N41912.
Where is Mode-S A4F825 registered?
Mode-S code A4F825 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 A4F825 broadcasting right now?
No active broadcast right now. Last signal was 15d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F825, octal 51174045, decimal 10,811,429.
What flights does A4F825 operate?
Mode-S A4F825 has broadcast 1 distinct callsign, including N41912.