Apparatus

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sensors Mode-S transponder

AC94D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N91FF · operated by FF22 LLC

Hex
AC94D5
Octal
53112325
Decimal
11,310,293
Country
US
Tail
N91FF
Type
C172
No current signal · last broadcast 3h ago
Flights observed
100
Distinct callsigns
1
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S AC94D5.

Country allocation

The ICAO 24-bit address AC94D5 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
RFS732 - 100 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RFS732 - Jul 14, 23:45 UTCJul 15, 00:50 UTC1h 5m
2026-07-14 RFS732 - Jul 14, 21:45 UTCJul 14, 22:45 UTC59m
2026-07-14 RFS732 - Jul 14, 19:30 UTCJul 14, 20:40 UTC1h 10m
2026-07-14 RFS732 - Jul 14, 17:55 UTCJul 14, 18:50 UTC55m
2026-07-14 RFS732 BFI → BFI Jul 14, 15:45 UTCJul 14, 17:15 UTC1h 30m
2026-07-13 RFS732 - Jul 13, 22:55 UTCJul 14, 00:30 UTC1h 35m
2026-07-13 RFS732 BFI → BFI Jul 13, 18:30 UTCJul 13, 19:45 UTC1h 15m
2026-07-12 RFS732 BFI → BFI Jul 12, 23:10 UTCJul 13, 00:45 UTC1h 35m
2026-07-12 RFS732 - Jul 12, 19:50 UTCJul 12, 20:50 UTC1h 0m
2026-07-12 RFS732 - Jul 12, 02:05 UTCJul 12, 02:50 UTC45m
2026-07-11 RFS732 - Jul 11, 21:10 UTCJul 11, 22:01 UTC50m
2026-07-11 RFS732 BFI → BFI Jul 11, 16:25 UTCJul 11, 17:55 UTC1h 30m
2026-07-10 RFS732 - Jul 10, 23:00 UTCJul 11, 00:35 UTC1h 35m
2026-07-10 RFS732 - Jul 10, 18:15 UTCJul 10, 19:15 UTC1h 0m
2026-07-10 RFS732 - Jul 10, 01:15 UTCJul 10, 02:00 UTC45m
2026-07-09 RFS732 - Jul 9, 21:45 UTCJul 9, 22:50 UTC1h 5m
2026-07-09 RFS732 - Jul 9, 15:40 UTCJul 9, 16:40 UTC1h 0m
2026-07-08 RFS732 BFI → BFI Jul 8, 21:35 UTCJul 8, 22:05 UTC30m
2026-07-08 RFS732 - Jul 8, 21:00 UTCJul 8, 21:30 UTC30m
2026-07-07 RFS732 - Jul 7, 21:25 UTCJul 7, 22:40 UTC1h 15m
2026-07-07 RFS732 - Jul 7, 18:25 UTCJul 7, 20:05 UTC1h 40m
2026-07-06 RFS732 BFI → BFI Jul 6, 15:00 UTCJul 6, 16:15 UTC1h 15m
2026-07-05 RFS732 - Jul 5, 23:55 UTCJul 6, 01:05 UTC1h 10m
2026-07-05 RFS732 BFI → BFI Jul 5, 21:35 UTCJul 5, 22:45 UTC1h 10m
2026-07-05 RFS732 - Jul 5, 19:35 UTCJul 5, 20:45 UTC1h 10m
2026-07-03 RFS732 - Jul 3, 22:15 UTCJul 3, 23:05 UTC50m
2026-07-02 RFS732 - Jul 2, 21:15 UTCJul 2, 22:20 UTC1h 5m
2026-07-02 RFS732 - Jul 2, 16:10 UTCJul 2, 16:55 UTC45m
2026-07-01 RFS732 - Jul 1, 19:40 UTCJul 1, 20:40 UTC1h 0m
2026-06-30 RFS732 - Jun 30, 22:50 UTCJun 30, 23:55 UTC1h 5m
2026-06-30 RFS732 - Jun 30, 19:00 UTCJun 30, 20:05 UTC1h 5m
2026-06-30 RFS732 - Jun 30, 00:00 UTCJun 30, 01:09 UTC1h 10m
2026-06-29 RFS732 BFI → BFI Jun 29, 22:00 UTCJun 29, 23:09 UTC1h 10m
2026-06-29 RFS732 - Jun 29, 02:45 UTCJun 29, 03:25 UTC40m
2026-06-28 RFS732 - Jun 28, 22:45 UTCJun 29, 00:14 UTC1h 30m
2026-06-25 RFS732 - Jun 25, 22:20 UTCJun 25, 23:19 UTC1h 0m
2026-06-25 RFS732 - Jun 25, 18:39 UTCJun 25, 19:59 UTC1h 20m
2026-06-24 RFS732 BFI → BFI Jun 24, 22:14 UTCJun 24, 23:24 UTC1h 10m
2026-06-24 RFS732 BFI → BFI Jun 24, 20:20 UTCJun 24, 21:19 UTC1h 0m
2026-06-24 RFS732 - Jun 24, 17:20 UTCJun 24, 18:20 UTC1h 0m
2026-06-24 RFS732 - Jun 24, 01:04 UTCJun 24, 02:40 UTC1h 35m
2026-06-23 RFS732 - Jun 23, 22:05 UTCJun 23, 23:00 UTC55m
2026-06-23 RFS732 - Jun 23, 19:39 UTCJun 23, 20:10 UTC30m
2026-06-23 RFS732 - Jun 23, 18:34 UTCJun 23, 19:34 UTC1h 0m
2026-06-23 RFS732 BFI → BFI Jun 23, 16:29 UTCJun 23, 17:44 UTC1h 15m
2026-06-19 RFS732 - Jun 19, 03:09 UTCJun 19, 03:20 UTC10m
2026-06-19 RFS732 BFI → BFI Jun 19, 02:14 UTCJun 19, 03:05 UTC50m
2026-06-19 RFS732 BFI → BFI Jun 19, 00:14 UTCJun 19, 01:24 UTC1h 10m
2026-06-18 RFS732 BFI → BFI Jun 18, 15:55 UTCJun 18, 17:21 UTC1h 26m
2026-06-18 RFS732 BFI → BFI Jun 18, 01:20 UTCJun 18, 02:50 UTC1h 30m

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 N91FF page for operator, model, and routing details .

Mode-S AC94D5 frequently asked

What is Mode-S code AC94D5?
AC94D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N91FF.
Where is Mode-S AC94D5 registered?
Mode-S code AC94D5 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 AC94D5 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC94D5, octal 53112325, decimal 11,310,293.
What flights does AC94D5 operate?
Mode-S AC94D5 has broadcast 1 distinct callsign, including RFS732.