Apparatus

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sensors Mode-S transponder

A9F0B4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N74FF · operated by FF22 LLC

Hex
A9F0B4
Octal
52370264
Decimal
11,137,204
Country
US
Tail
N74FF
Type
C172
Transponder active on ground
Flights observed
23
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A9F0B4.

Country allocation

The ICAO 24-bit address A9F0B4 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
N74FF - 23 2026-05-19

Recent flights last 23

DateFlightRouteTakeoffLandingDuration
2026-05-19 N74FF BFL → BFL May 19, 23:10 UTCMay 20, 00:00 UTC50m
2026-05-19 N74FF BFL → BFL May 19, 20:35 UTCMay 19, 21:55 UTC1h 20m
2026-05-16 N74FF BFL → BFL May 16, 18:30 UTCMay 16, 19:40 UTC1h 10m
2026-05-16 N74FF - May 16, 02:00 UTCMay 16, 02:50 UTC50m
2026-05-16 N74FF BFL → BFL May 16, 00:05 UTCMay 16, 01:05 UTC1h 0m
2026-05-15 N74FF BFL → BFL May 15, 20:45 UTCMay 15, 21:30 UTC45m
2026-05-14 N74FF BFL → BFL May 14, 23:00 UTCMay 15, 00:00 UTC1h 0m
2026-05-14 N74FF - May 14, 05:15 UTCMay 14, 05:50 UTC35m
2026-05-14 N74FF - May 14, 03:20 UTCMay 14, 04:00 UTC40m
2026-05-14 N74FF - May 14, 01:55 UTCMay 14, 02:20 UTC25m
2026-05-11 N74FF - May 11, 18:15 UTCMay 11, 18:40 UTC25m
2026-05-11 N74FF - May 11, 16:15 UTCMay 11, 16:45 UTC30m
2026-05-11 N74FF - May 11, 00:49 UTCMay 11, 01:20 UTC30m
2026-05-10 N74FF - May 10, 23:35 UTCMay 10, 23:55 UTC20m
2026-05-09 N74FF BFL → BFL May 9, 20:44 UTCMay 9, 21:55 UTC1h 10m
2026-05-08 N74FF - May 8, 17:55 UTCMay 8, 19:15 UTC1h 20m
2026-05-08 N74FF - May 8, 16:30 UTCMay 8, 17:30 UTC1h 0m
2026-05-06 N74FF - May 6, 03:20 UTCMay 6, 03:35 UTC15m
2026-05-06 N74FF - May 6, 01:01 UTCMay 6, 02:20 UTC1h 20m
2026-05-05 N74FF - May 5, 22:15 UTCMay 6, 00:10 UTC1h 55m
2026-05-05 N74FF - May 5, 21:01 UTCMay 5, 21:25 UTC25m
2026-05-03 N74FF BFL → BFL May 3, 20:40 UTCMay 3, 21:39 UTC1h 0m
2026-05-02 N74FF BFL → BFL May 2, 01:15 UTCMay 2, 02:00 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 N74FF page for operator, model, and routing details .

Mode-S A9F0B4 frequently asked

What is Mode-S code A9F0B4?
A9F0B4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N74FF.
Where is Mode-S A9F0B4 registered?
Mode-S code A9F0B4 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 A9F0B4 broadcasting right now?
Mode-S A9F0B4 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9F0B4, octal 52370264, decimal 11,137,204.
What flights does A9F0B4 operate?
Mode-S A9F0B4 has broadcast 1 distinct callsign, including N74FF.