Apparatus

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sensors Mode-S transponder

AC9E83

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N912EF · AIRBUS HELICOPTERS EC-135/635 · operated by ACM EL TRUST SUBSIDIARY LLC

Hex
AC9E83
Octal
53117203
Decimal
11,312,771
Country
US
Tail
N912EF
Type
EC35
Broadcasting now · callsign N912EF · 5,300 ft
Flights observed
120
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Current position

AC9E83 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC9E83 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
N912EF - 120 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-23 N912EF - Jun 23, 17:39 UTCJun 23, 18:10 UTC30m
2026-06-22 N912EF - Jun 22, 22:59 UTCJun 22, 23:20 UTC20m
2026-06-20 N912EF - Jun 20, 19:04 UTCJun 20, 19:40 UTC35m
2026-06-19 N912EF - Jun 19, 18:39 UTCJun 19, 19:14 UTC35m
2026-06-19 N912EF - Jun 19, 15:14 UTCJun 19, 15:49 UTC35m
2026-06-15 N912EF - Jun 15, 23:25 UTCJun 15, 23:39 UTC15m
2026-06-15 N912EF - Jun 15, 20:15 UTCJun 15, 21:14 UTC1h 0m
2026-06-15 N912EF - Jun 15, 18:45 UTCJun 15, 19:05 UTC20m
2026-06-13 N912EF - Jun 13, 21:40 UTCJun 13, 22:00 UTC20m
2026-06-13 N912EF - Jun 13, 20:25 UTCJun 13, 20:40 UTC15m
2026-06-13 N912EF - Jun 13, 18:30 UTCJun 13, 19:20 UTC50m
2026-06-13 N912EF - Jun 13, 16:30 UTCJun 13, 16:50 UTC20m
2026-06-11 N912EF - Jun 11, 22:45 UTCJun 11, 23:00 UTC15m
2026-06-11 N912EF - Jun 11, 21:35 UTCJun 11, 21:55 UTC20m
2026-06-09 N912EF - Jun 9, 21:50 UTCJun 9, 22:10 UTC20m
2026-06-07 N912EF - Jun 7, 20:50 UTCJun 7, 21:10 UTC20m
2026-06-07 N912EF - Jun 7, 19:30 UTCJun 7, 19:50 UTC20m
2026-06-07 N912EF - Jun 7, 17:00 UTCJun 7, 18:25 UTC1h 25m
2026-06-05 N912EF - Jun 5, 20:45 UTCJun 5, 21:05 UTC20m
2026-06-05 N912EF - Jun 5, 19:35 UTCJun 5, 19:50 UTC15m
2026-06-05 N912EF - Jun 5, 18:25 UTCJun 5, 18:45 UTC20m
2026-06-05 N912EF - Jun 5, 16:00 UTCJun 5, 16:20 UTC20m
2026-06-05 N912EF - Jun 5, 14:50 UTCJun 5, 15:05 UTC15m
2026-06-03 N912EF - Jun 3, 21:45 UTCJun 3, 21:55 UTC10m
2026-06-03 N912EF - Jun 3, 20:05 UTCJun 3, 20:20 UTC15m
2026-06-03 N912EF - Jun 3, 18:35 UTCJun 3, 18:50 UTC15m
2026-06-03 N912EF - Jun 3, 17:15 UTCJun 3, 17:25 UTC10m
2026-06-03 N912EF - Jun 3, 16:10 UTCJun 3, 16:25 UTC15m
2026-06-02 N912EF - Jun 2, 22:15 UTCJun 2, 22:35 UTC20m
2026-06-02 N912EF - Jun 2, 20:25 UTCJun 2, 20:40 UTC15m
2026-06-02 N912EF - Jun 2, 18:50 UTCJun 2, 19:10 UTC20m
2026-06-01 N912EF - Jun 1, 23:20 UTCJun 1, 23:50 UTC30m
2026-06-01 N912EF - Jun 1, 22:20 UTCJun 1, 22:35 UTC15m
2026-05-31 N912EF - May 31, 18:40 UTCMay 31, 19:20 UTC40m
2026-05-30 N912EF - May 30, 21:05 UTCMay 30, 21:20 UTC15m
2026-05-30 N912EF - May 30, 19:10 UTCMay 30, 19:30 UTC20m
2026-05-30 N912EF - May 30, 16:30 UTCMay 30, 16:55 UTC25m
2026-05-30 N912EF - May 30, 15:30 UTCMay 30, 15:50 UTC20m
2026-05-28 N912EF - May 28, 21:30 UTCMay 28, 21:45 UTC15m
2026-05-28 N912EF - May 28, 18:15 UTCMay 28, 18:35 UTC20m
2026-05-28 N912EF - May 28, 14:30 UTCMay 28, 15:30 UTC1h 0m
2026-05-27 N912EF - May 27, 06:09 UTCMay 27, 06:34 UTC25m
2026-05-27 N912EF - May 27, 04:49 UTCMay 27, 05:09 UTC20m
2026-05-27 N912EF - May 27, 02:54 UTCMay 27, 03:14 UTC20m
2026-05-25 N912EF - May 25, 22:19 UTCMay 25, 22:44 UTC25m
2026-05-25 N912EF - May 25, 20:09 UTCMay 25, 20:40 UTC30m
2026-05-25 N912EF - May 25, 16:55 UTCMay 25, 17:30 UTC35m
2026-05-24 N912EF - May 24, 18:55 UTCMay 24, 19:25 UTC30m
2026-05-24 N912EF - May 24, 17:25 UTCMay 24, 18:00 UTC35m
2026-05-23 N912EF - May 23, 22:25 UTCMay 23, 23:00 UTC35m

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 N912EF page for operator, model, and routing details .

Mode-S AC9E83 frequently asked

What is Mode-S code AC9E83?
AC9E83 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N912EF.
Where is Mode-S AC9E83 registered?
Mode-S code AC9E83 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 AC9E83 broadcasting right now?
Yes. Mode-S AC9E83 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC9E83, octal 53117203, decimal 11,312,771.
What flights does AC9E83 operate?
Mode-S AC9E83 has broadcast 1 distinct callsign, including N912EF.