Apparatus

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sensors Mode-S transponder

A172C9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1926F · CESSNA 172 Skyhawk · operated by UNITED FLYING CLUB INC

Hex
A172C9
Octal
50271311
Decimal
10,580,681
Country
US
Tail
N1926F
Type
C172
No current signal · last broadcast 10h ago
Flights observed
146
Distinct callsigns
1
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S A172C9.

Country allocation

The ICAO 24-bit address A172C9 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
N1926F - 146 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 N1926F - Jul 21, 03:45 UTCJul 21, 05:00 UTC1h 15m
2026-07-11 N1926F - Jul 11, 23:40 UTCJul 12, 00:25 UTC45m
2026-07-11 N1926F - Jul 11, 22:40 UTCJul 11, 23:35 UTC55m
2026-07-11 N1926F - Jul 11, 06:40 UTCJul 11, 07:35 UTC55m
2026-07-11 N1926F - Jul 11, 04:35 UTCJul 11, 05:25 UTC50m
2026-07-11 N1926F - Jul 11, 01:25 UTCJul 11, 02:25 UTC1h 0m
2026-07-10 N1926F - Jul 10, 23:35 UTCJul 11, 00:30 UTC55m
2026-07-09 N1926F SQL → SQL Jul 9, 21:45 UTCJul 9, 23:35 UTC1h 50m
2026-07-09 N1926F SQL → SQL Jul 9, 19:15 UTCJul 9, 21:00 UTC1h 45m
2026-07-09 N1926F - Jul 9, 02:45 UTCJul 9, 03:50 UTC1h 5m
2026-07-08 N1926F SQL → SQL Jul 8, 20:25 UTCJul 8, 21:00 UTC35m
2026-07-08 N1926F - Jul 8, 18:20 UTCJul 8, 19:05 UTC45m
2026-07-02 N1926F SQL → SQL Jul 2, 01:45 UTCJul 2, 02:50 UTC1h 5m
2026-07-01 N1926F - Jul 1, 19:25 UTCJul 1, 21:15 UTC1h 50m
2026-07-01 N1926F - Jul 1, 00:50 UTCJul 1, 02:25 UTC1h 35m
2026-06-30 N1926F - Jun 30, 23:10 UTCJul 1, 00:10 UTC1h 0m
2026-06-30 N1926F PAO → SQL Jun 30, 19:05 UTCJun 30, 19:15 UTC10m
2026-06-30 N1926F SQL → PAO Jun 30, 18:50 UTCJun 30, 19:00 UTC10m
2026-06-30 N1926F SQL → SQL Jun 30, 18:35 UTCJun 30, 18:45 UTC10m
2026-06-30 N1926F - Jun 30, 17:25 UTCJun 30, 17:45 UTC20m
2026-06-30 N1926F - Jun 30, 17:05 UTCJun 30, 17:20 UTC15m
2026-06-30 N1926F SQL → SQL Jun 30, 16:10 UTCJun 30, 16:45 UTC35m
2026-06-30 N1926F SQL → SQL Jun 30, 15:55 UTCJun 30, 16:05 UTC10m
2026-06-30 N1926F - Jun 30, 03:05 UTCJun 30, 03:30 UTC25m
2026-06-30 N1926F - Jun 30, 01:40 UTCJun 30, 02:20 UTC40m
2026-06-30 N1926F - Jun 30, 01:00 UTCJun 30, 01:19 UTC20m
2026-06-30 N1926F - Jun 30, 00:25 UTCJun 30, 00:55 UTC30m
2026-06-29 N1926F - Jun 29, 21:30 UTCJun 29, 22:59 UTC1h 30m
2026-06-29 N1926F - Jun 29, 18:14 UTCJun 29, 19:15 UTC1h 0m
2026-06-28 N1926F - Jun 28, 22:29 UTCJun 28, 23:14 UTC45m
2026-06-28 N1926F - Jun 28, 19:25 UTCJun 28, 20:39 UTC1h 15m
2026-06-28 N1926F - Jun 28, 03:09 UTCJun 28, 03:35 UTC25m
2026-06-28 N1926F - Jun 28, 00:20 UTCJun 28, 00:50 UTC30m
2026-06-25 N1926F - Jun 25, 19:44 UTCJun 25, 20:59 UTC1h 15m
2026-06-25 N1926F - Jun 25, 02:25 UTCJun 25, 03:40 UTC1h 15m
2026-06-24 N1926F - Jun 24, 21:54 UTCJun 24, 23:54 UTC2h 0m
2026-06-24 N1926F - Jun 24, 18:55 UTCJun 24, 20:20 UTC1h 25m
2026-06-21 N1926F - Jun 21, 22:54 UTCJun 21, 23:40 UTC45m
2026-06-21 N1926F SQL → SQL Jun 21, 20:09 UTCJun 21, 20:40 UTC30m
2026-06-21 N1926F SQL → SQL Jun 21, 19:45 UTCJun 21, 20:05 UTC20m
2026-06-20 N1926F - Jun 20, 21:55 UTCJun 20, 22:45 UTC50m
2026-06-20 N1926F SQL → SQL Jun 20, 18:54 UTCJun 20, 20:45 UTC1h 50m
2026-06-19 N1926F SQL → SQL Jun 19, 21:49 UTCJun 19, 23:25 UTC1h 35m
2026-06-19 N1926F SQL → SQL Jun 19, 18:25 UTCJun 19, 19:04 UTC40m
2026-06-18 N1926F - Jun 18, 20:20 UTCJun 18, 21:45 UTC1h 25m
2026-06-18 N1926F - Jun 18, 02:25 UTCJun 18, 03:55 UTC1h 30m
2026-06-17 N1926F - Jun 17, 22:10 UTCJun 17, 23:15 UTC1h 5m
2026-06-17 N1926F - Jun 17, 18:10 UTCJun 17, 21:10 UTC3h 0m
2026-06-17 N1926F SQL → SQL Jun 17, 02:05 UTCJun 17, 03:25 UTC1h 20m
2026-06-16 N1926F SQL → SQL Jun 16, 19:19 UTCJun 16, 20:50 UTC1h 31m

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 N1926F page for operator, model, and routing details .

Mode-S A172C9 frequently asked

What is Mode-S code A172C9?
A172C9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1926F.
Where is Mode-S A172C9 registered?
Mode-S code A172C9 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 A172C9 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A172C9, octal 50271311, decimal 10,580,681.
What flights does A172C9 operate?
Mode-S A172C9 has broadcast 1 distinct callsign, including N1926F.