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sensors Mode-S transponder

AC9EFD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N912KC · AEROSPATIALE AS-350 Ecureuil · operated by KERN COUNTY SHERIFFS OFFICE

Hex
AC9EFD
Octal
53117375
Decimal
11,312,893
Country
US
Tail
N912KC
Type
AS50
No current signal · last broadcast Jul 24, 22:05 UTC
Flights observed
65
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 22:05 UTC

Last known position

Most recent position reported by Mode-S AC9EFD.

Country allocation

The ICAO 24-bit address AC9EFD 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
N912KC - 65 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N912KC - Jul 24, 21:55 UTCJul 24, 22:00 UTC5m
2026-07-24 N912KC - Jul 24, 20:35 UTCJul 24, 21:05 UTC30m
2026-07-22 N912KC BFL → BFL Jul 22, 17:25 UTCJul 22, 18:40 UTC1h 15m
2026-07-21 N912KC BFL → BFL Jul 21, 04:05 UTCJul 21, 04:55 UTC50m
2026-07-17 N912KC BFL → BFL Jul 17, 22:40 UTCJul 18, 00:15 UTC1h 35m
2026-07-17 N912KC - Jul 17, 00:45 UTCJul 17, 02:20 UTC1h 35m
2026-07-16 N912KC BFL → BFL Jul 16, 21:19 UTCJul 16, 22:15 UTC55m
2026-07-16 N912KC - Jul 16, 17:00 UTCJul 16, 17:35 UTC35m
2026-07-16 N912KC - Jul 16, 15:55 UTCJul 16, 16:55 UTC1h 0m
2026-07-15 N912KC BFL → BFL Jul 15, 20:30 UTCJul 15, 21:55 UTC1h 25m
2026-07-13 N912KC - Jul 13, 21:10 UTCJul 13, 21:40 UTC30m
2026-07-13 N912KC BFL → BFL Jul 13, 20:55 UTCJul 13, 21:05 UTC10m
2026-07-12 N912KC - Jul 12, 02:15 UTCJul 12, 03:45 UTC1h 30m
2026-07-09 N912KC - Jul 9, 17:25 UTCJul 9, 19:15 UTC1h 50m
2026-07-07 N912KC - Jul 7, 20:25 UTCJul 7, 20:35 UTC10m
2026-07-07 N912KC - Jul 7, 18:05 UTCJul 7, 18:15 UTC10m
2026-07-05 N912KC - Jul 5, 19:40 UTCJul 5, 19:45 UTC5m
2026-07-05 N912KC - Jul 5, 17:45 UTCJul 5, 17:55 UTC10m
2026-07-01 N912KC BFL → BFL Jul 1, 18:20 UTCJul 1, 18:25 UTC5m
2026-06-26 N912KC - Jun 26, 00:39 UTCJun 26, 01:10 UTC30m
2026-06-25 N912KC - Jun 25, 22:39 UTCJun 25, 23:24 UTC45m
2026-06-23 N912KC BFL → BFL Jun 23, 17:30 UTCJun 23, 19:19 UTC1h 50m
2026-06-16 N912KC BFL → BFL Jun 16, 21:20 UTCJun 16, 21:45 UTC25m
2026-06-11 N912KC BFL → BFL Jun 11, 02:55 UTCJun 11, 04:45 UTC1h 50m
2026-06-10 N912KC - Jun 10, 21:40 UTCJun 10, 21:50 UTC10m
2026-06-10 N912KC - Jun 10, 20:30 UTCJun 10, 20:40 UTC10m
2026-06-09 N912KC BFL → BFL Jun 9, 17:05 UTCJun 9, 17:10 UTC5m
2026-06-08 N912KC - Jun 8, 21:05 UTCJun 8, 21:20 UTC15m
2026-06-08 N912KC - Jun 8, 19:20 UTCJun 8, 19:30 UTC10m
2026-06-08 N912KC - Jun 8, 17:40 UTCJun 8, 17:50 UTC10m
2026-06-06 N912KC - Jun 6, 21:44 UTCJun 6, 22:00 UTC15m
2026-06-06 N912KC - Jun 6, 19:34 UTCJun 6, 19:40 UTC5m
2026-06-06 N912KC BFL → BFL Jun 6, 06:45 UTCJun 6, 08:05 UTC1h 20m
2026-06-06 N912KC BFL → BFL Jun 6, 03:15 UTCJun 6, 05:50 UTC2h 35m
2026-06-05 N912KC - Jun 5, 22:30 UTCJun 5, 23:55 UTC1h 25m
2026-06-05 N912KC BFL → CLD Jun 5, 17:10 UTCJun 5, 18:45 UTC1h 35m
2026-06-05 N912KC BFL → BFL Jun 5, 08:55 UTCJun 5, 10:05 UTC1h 10m
2026-06-05 N912KC BFL → BFL Jun 5, 06:10 UTCJun 5, 08:10 UTC2h 0m
2026-06-05 N912KC - Jun 5, 01:50 UTCJun 5, 03:45 UTC1h 55m
2026-06-03 N912KC BFL → BFL Jun 3, 23:45 UTCJun 4, 01:45 UTC2h 0m
2026-06-03 N912KC - Jun 3, 22:55 UTCJun 3, 23:00 UTC5m
2026-06-03 N912KC - Jun 3, 21:20 UTCJun 3, 22:15 UTC55m
2026-06-03 N912KC - Jun 3, 19:55 UTCJun 3, 20:40 UTC45m
2026-06-03 N912KC - Jun 3, 18:50 UTCJun 3, 19:00 UTC10m
2026-06-02 N912KC - Jun 2, 16:20 UTCJun 2, 16:35 UTC15m
2026-05-28 N912KC - May 28, 18:40 UTCMay 28, 18:50 UTC10m
2026-05-28 N912KC - May 28, 14:25 UTCMay 28, 14:50 UTC25m
2026-05-26 N912KC BFL → BFL May 26, 17:04 UTCMay 26, 18:40 UTC1h 35m
2026-05-21 N912KC - May 21, 23:05 UTCMay 21, 23:15 UTC10m
2026-05-21 N912KC - May 21, 20:35 UTCMay 21, 20:50 UTC15m

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 N912KC page for operator, model, and routing details .

Mode-S AC9EFD frequently asked

What is Mode-S code AC9EFD?
AC9EFD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N912KC.
Where is Mode-S AC9EFD registered?
Mode-S code AC9EFD 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 AC9EFD broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC9EFD, octal 53117375, decimal 11,312,893.
What flights does AC9EFD operate?
Mode-S AC9EFD has broadcast 1 distinct callsign, including N912KC.