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sensors Mode-S transponder

A709FF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N55256 · CESSNA 172 Skyhawk · operated by NOTAM AVIATION LLC

Hex
A709FF
Octal
51604777
Decimal
10,947,071
Country
US
Tail
N55256
Type
C172
No current signal · last broadcast 25m ago
Flights observed
166
Distinct callsigns
1
Country
US
Last broadcast
25m ago

Last known position

Most recent position reported by Mode-S A709FF.

Country allocation

The ICAO 24-bit address A709FF 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
N55256 - 166 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 N55256 - Jun 16, 23:10 UTCJun 16, 23:45 UTC35m
2026-06-16 N55256 - Jun 16, 20:20 UTCJun 16, 20:55 UTC35m
2026-06-16 N55256 - Jun 16, 17:45 UTCJun 16, 19:19 UTC1h 35m
2026-06-16 N55256 - Jun 16, 12:50 UTCJun 16, 15:15 UTC2h 25m
2026-06-16 N55256 - Jun 16, 11:20 UTCJun 16, 12:05 UTC45m
2026-06-15 N55256 - Jun 15, 21:04 UTCJun 15, 21:45 UTC40m
2026-06-15 N55256 - Jun 15, 19:45 UTCJun 15, 20:30 UTC45m
2026-06-15 N55256 - Jun 15, 17:34 UTCJun 15, 18:40 UTC1h 5m
2026-06-15 N55256 - Jun 15, 16:35 UTCJun 15, 16:45 UTC10m
2026-06-15 N55256 - Jun 15, 14:40 UTCJun 15, 14:50 UTC10m
2026-06-14 N55256 - Jun 14, 22:40 UTCJun 14, 23:05 UTC25m
2026-06-14 N55256 - Jun 14, 17:25 UTCJun 14, 18:50 UTC1h 25m
2026-06-14 N55256 - Jun 14, 15:45 UTCJun 14, 16:30 UTC45m
2026-06-14 N55256 - Jun 14, 00:30 UTCJun 14, 01:15 UTC45m
2026-06-13 N55256 - Jun 13, 23:25 UTCJun 13, 23:50 UTC25m
2026-06-13 N55256 - Jun 13, 00:20 UTCJun 13, 00:55 UTC35m
2026-06-12 N55256 - Jun 12, 21:25 UTCJun 12, 22:20 UTC55m
2026-06-12 N55256 - Jun 12, 19:45 UTCJun 12, 19:55 UTC10m
2026-06-12 N55256 - Jun 12, 18:10 UTCJun 12, 19:15 UTC1h 5m
2026-06-12 N55256 - Jun 12, 15:40 UTCJun 12, 16:35 UTC55m
2026-06-11 N55256 - Jun 11, 21:55 UTCJun 11, 22:05 UTC10m
2026-06-11 N55256 - Jun 11, 15:35 UTCJun 11, 16:30 UTC55m
2026-06-10 N55256 - Jun 10, 17:40 UTCJun 10, 18:30 UTC50m
2026-06-10 N55256 - Jun 10, 15:30 UTCJun 10, 16:45 UTC1h 15m
2026-06-10 N55256 - Jun 10, 00:20 UTCJun 10, 01:45 UTC1h 25m
2026-06-09 N55256 - Jun 9, 22:35 UTCJun 9, 23:05 UTC30m
2026-06-09 N55256 - Jun 9, 20:50 UTCJun 9, 21:05 UTC15m
2026-06-09 N55256 - Jun 9, 16:45 UTCJun 9, 17:40 UTC55m
2026-06-07 N55256 - Jun 7, 19:50 UTCJun 7, 20:35 UTC45m
2026-06-07 N55256 - Jun 7, 18:05 UTCJun 7, 19:05 UTC1h 0m
2026-06-07 N55256 - Jun 7, 14:45 UTCJun 7, 16:30 UTC1h 45m
2026-06-06 N55256 - Jun 6, 18:14 UTCJun 6, 19:14 UTC1h 0m
2026-06-06 N55256 - Jun 6, 17:44 UTCJun 6, 18:09 UTC25m
2026-06-06 N55256 - Jun 6, 14:00 UTCJun 6, 14:40 UTC40m
2026-06-06 N55256 - Jun 6, 13:39 UTCJun 6, 13:54 UTC15m
2026-06-05 N55256 - Jun 5, 22:00 UTCJun 5, 22:30 UTC30m
2026-06-05 N55256 - Jun 5, 21:40 UTCJun 5, 21:55 UTC15m
2026-06-05 N55256 - Jun 5, 15:35 UTCJun 5, 16:45 UTC1h 10m
2026-06-05 N55256 - Jun 5, 02:40 UTCJun 5, 04:45 UTC2h 5m
2026-06-05 N55256 - Jun 5, 00:00 UTCJun 5, 01:05 UTC1h 5m
2026-06-04 N55256 - Jun 4, 22:15 UTCJun 4, 22:30 UTC15m
2026-06-04 N55256 - Jun 4, 21:05 UTCJun 4, 22:10 UTC1h 5m
2026-06-04 N55256 - Jun 4, 18:20 UTCJun 4, 19:45 UTC1h 25m
2026-06-04 N55256 - Jun 4, 15:40 UTCJun 4, 17:00 UTC1h 20m
2026-06-02 N55256 - Jun 2, 11:45 UTCJun 2, 12:40 UTC55m
2026-06-01 N55256 - Jun 1, 15:25 UTCJun 1, 16:40 UTC1h 15m
2026-05-31 N55256 - May 31, 22:45 UTCMay 31, 23:25 UTC40m
2026-05-31 N55256 - May 31, 19:10 UTCMay 31, 19:25 UTC15m
2026-05-31 N55256 - May 31, 14:25 UTCMay 31, 15:25 UTC1h 0m
2026-05-30 N55256 - May 30, 18:35 UTCMay 30, 18:55 UTC20m

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 N55256 page for operator, model, and routing details .

Mode-S A709FF frequently asked

What is Mode-S code A709FF?
A709FF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N55256.
Where is Mode-S A709FF registered?
Mode-S code A709FF 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 A709FF broadcasting right now?
No active broadcast right now. Last signal was 25m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A709FF, octal 51604777, decimal 10,947,071.
What flights does A709FF operate?
Mode-S A709FF has broadcast 1 distinct callsign, including N55256.