Apparatus

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sensors Mode-S transponder

AC9AEF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N911FR · operated by MIAMI DADE FIRE RESCUE DEPARTMENT

Hex
AC9AEF
Octal
53115357
Decimal
11,311,855
Country
US
Tail
N911FR
Type
A139
No current signal · last broadcast Jul 26, 03:20 UTC
Flights observed
200
Distinct callsigns
2
Country
US
Last broadcast
Jul 26, 03:20 UTC

Last known position

Most recent position reported by Mode-S AC9AEF.

Country allocation

The ICAO 24-bit address AC9AEF 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 2 distinct

Callsign Airline Flights Last seen
AR3 - 199 2026-07-26
N911FR - 1 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AR3 - Jul 26, 02:45 UTCJul 26, 03:20 UTC35m
2026-07-26 AR3 - Jul 26, 01:20 UTCJul 26, 01:30 UTC10m
2026-07-25 AR3 - Jul 25, 05:35 UTCJul 25, 06:00 UTC25m
2026-07-23 AR3 - Jul 23, 17:20 UTCJul 23, 18:10 UTC50m
2026-07-23 AR3 - Jul 23, 15:55 UTCJul 23, 16:40 UTC45m
2026-07-22 AR3 - Jul 22, 20:20 UTCJul 22, 21:05 UTC45m
2026-07-21 AR3 OPF → OPF Jul 21, 23:30 UTCJul 21, 23:40 UTC10m
2026-07-21 AR3 - Jul 21, 19:25 UTCJul 21, 19:55 UTC30m
2026-07-21 AR3 - Jul 21, 00:10 UTCJul 21, 00:30 UTC20m
2026-07-20 AR3 - Jul 20, 21:20 UTCJul 20, 22:05 UTC45m
2026-07-20 AR3 - Jul 20, 19:00 UTCJul 20, 19:35 UTC35m
2026-07-19 AR3 - Jul 19, 01:30 UTCJul 19, 01:55 UTC25m
2026-07-18 AR3 - Jul 18, 21:30 UTCJul 18, 22:05 UTC35m
2026-07-18 AR3 - Jul 18, 17:00 UTCJul 18, 17:30 UTC30m
2026-07-18 AR3 - Jul 18, 10:55 UTCJul 18, 11:15 UTC20m
2026-07-17 AR3 - Jul 17, 19:40 UTCJul 17, 20:10 UTC30m
2026-07-17 AR3 - Jul 17, 16:40 UTCJul 17, 17:15 UTC35m
2026-07-16 AR3 - Jul 16, 14:20 UTCJul 16, 14:40 UTC20m
2026-07-15 AR3 TMB → TMB Jul 15, 22:45 UTCJul 16, 00:20 UTC1h 35m
2026-07-15 AR3 - Jul 15, 21:15 UTCJul 15, 21:50 UTC35m
2026-07-15 AR3 - Jul 15, 17:10 UTCJul 15, 17:55 UTC45m
2026-07-14 AR3 OPF → TMB Jul 14, 18:45 UTCJul 14, 19:35 UTC50m
2026-07-14 AR3 - Jul 14, 15:45 UTCJul 14, 16:00 UTC15m
2026-07-14 AR3 - Jul 14, 02:05 UTCJul 14, 02:50 UTC45m
2026-07-14 AR3 - Jul 14, 00:35 UTCJul 14, 01:25 UTC50m
2026-07-13 AR3 - Jul 13, 22:35 UTCJul 13, 23:10 UTC35m
2026-07-13 AR3 - Jul 13, 19:55 UTCJul 13, 20:05 UTC10m
2026-07-13 AR3 - Jul 13, 14:40 UTCJul 13, 15:45 UTC1h 5m
2026-07-12 AR3 - Jul 12, 22:05 UTCJul 12, 22:25 UTC20m
2026-07-12 AR3 - Jul 12, 19:25 UTCJul 12, 20:05 UTC40m
2026-07-11 AR3 TMB → TMB Jul 11, 22:30 UTCJul 11, 23:40 UTC1h 10m
2026-07-11 AR3 - Jul 11, 08:40 UTCJul 11, 09:15 UTC35m
2026-07-10 AR3 - Jul 10, 13:05 UTCJul 10, 13:55 UTC50m
2026-07-10 AR3 - Jul 10, 01:15 UTCJul 10, 01:50 UTC35m
2026-07-08 AR3 - Jul 8, 22:05 UTCJul 8, 22:40 UTC35m
2026-07-08 AR3 - Jul 8, 12:35 UTCJul 8, 13:00 UTC25m
2026-07-06 AR3 - Jul 6, 18:05 UTCJul 6, 18:25 UTC20m
2026-07-06 AR3 - Jul 6, 06:50 UTCJul 6, 07:20 UTC30m
2026-07-05 AR3 - Jul 5, 08:15 UTCJul 5, 08:55 UTC40m
2026-07-04 AR3 OPF → OPF Jul 4, 20:30 UTCJul 4, 21:10 UTC40m
2026-07-04 AR3 - Jul 4, 00:10 UTCJul 4, 00:55 UTC45m
2026-07-02 AR3 OPF → OPF Jul 2, 23:05 UTCJul 2, 23:40 UTC35m
2026-07-02 AR3 - Jul 2, 00:05 UTCJul 2, 00:45 UTC40m
2026-07-01 AR3 - Jul 1, 00:00 UTCJul 1, 00:25 UTC25m
2026-06-30 AR3 OPF → OPF Jun 30, 14:10 UTCJun 30, 15:15 UTC1h 5m
2026-06-29 AR3 - Jun 29, 20:04 UTCJun 29, 20:59 UTC55m
2026-06-28 AR3 - Jun 28, 22:10 UTCJun 28, 22:45 UTC35m
2026-06-27 AR3 - Jun 27, 02:29 UTCJun 27, 02:45 UTC15m
2026-06-26 AR3 OPF → OPF Jun 26, 22:40 UTCJun 26, 23:34 UTC55m
2026-06-26 AR3 - Jun 26, 21:20 UTCJun 26, 22:05 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 N911FR page for operator, model, and routing details .

Mode-S AC9AEF frequently asked

What is Mode-S code AC9AEF?
AC9AEF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N911FR.
Where is Mode-S AC9AEF registered?
Mode-S code AC9AEF 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 AC9AEF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 03:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC9AEF, octal 53115357, decimal 11,311,855.
What flights does AC9AEF operate?
Mode-S AC9AEF has broadcast 2 distinct callsigns, including AR3, N911FR.