Apparatus

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sensors Mode-S transponder

A1FC9C

ICAO 24-bit transponder address · allocated to United States

Hex
A1FC9C
Octal
50376234
Decimal
10,615,964
Country
US
No current signal · last broadcast Jul 25, 19:15 UTC
Flights observed
56
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 19:15 UTC

Last known position

Most recent position reported by Mode-S A1FC9C.

Country allocation

The ICAO 24-bit address A1FC9C 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
N227SK - 56 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N227SK DBQ → DBQ Jul 25, 17:30 UTCJul 25, 19:15 UTC1h 45m
2026-07-24 N227SK DBQ → DBQ Jul 24, 22:15 UTCJul 24, 23:05 UTC50m
2026-07-24 N227SK DBQ → DBQ Jul 24, 20:20 UTCJul 24, 21:10 UTC50m
2026-07-24 N227SK DBQ → DBQ Jul 24, 15:40 UTCJul 24, 16:35 UTC55m
2026-07-24 N227SK MSN → DBQ Jul 24, 03:05 UTCJul 24, 03:40 UTC35m
2026-07-24 N227SK DBQ → MSN Jul 24, 00:10 UTCJul 24, 00:45 UTC35m
2026-07-23 N227SK DBQ → DBQ Jul 23, 14:45 UTCJul 23, 15:50 UTC1h 5m
2026-07-22 N227SK DBQ → DBQ Jul 22, 20:35 UTCJul 22, 21:10 UTC35m
2026-07-22 N227SK DBQ → DBQ Jul 22, 18:25 UTCJul 22, 19:30 UTC1h 5m
2026-07-22 N227SK DBQ → DBQ Jul 22, 15:55 UTCJul 22, 16:25 UTC30m
2026-07-21 N227SK DBQ → DBQ Jul 21, 15:30 UTCJul 21, 16:15 UTC45m
2026-07-21 N227SK DBQ → DBQ Jul 21, 12:40 UTCJul 21, 13:40 UTC1h 0m
2026-07-17 N227SK DBQ → DBQ Jul 17, 00:14 UTCJul 17, 01:15 UTC1h 0m
2026-07-15 N227SK DBQ → DBQ Jul 15, 19:50 UTCJul 15, 20:40 UTC50m
2026-07-15 N227SK - Jul 15, 17:30 UTCJul 15, 18:30 UTC1h 0m
2026-07-15 N227SK DBQ → DBQ Jul 15, 15:30 UTCJul 15, 16:20 UTC50m
2026-07-15 N227SK - Jul 15, 13:50 UTCJul 15, 14:30 UTC40m
2026-07-14 N227SK DBQ → DBQ Jul 14, 16:00 UTCJul 14, 16:25 UTC25m
2026-07-14 N227SK DBQ → DBQ Jul 14, 12:35 UTCJul 14, 13:40 UTC1h 5m
2026-07-13 N227SK - Jul 13, 21:35 UTCJul 13, 22:20 UTC45m
2026-07-13 N227SK - Jul 13, 20:00 UTCJul 13, 20:40 UTC40m
2026-07-13 N227SK DBQ → DBQ Jul 13, 17:45 UTCJul 13, 18:35 UTC50m
2026-07-11 N227SK DBQ → DBQ Jul 11, 17:15 UTCJul 11, 18:00 UTC45m
2026-07-11 N227SK DBQ → DBQ Jul 11, 14:35 UTCJul 11, 15:30 UTC55m
2026-07-11 N227SK DBQ → DBQ Jul 11, 02:15 UTCJul 11, 04:01 UTC1h 45m
2026-07-10 N227SK - Jul 10, 23:55 UTCJul 11, 00:15 UTC20m
2026-07-10 N227SK - Jul 10, 23:35 UTCJul 10, 23:45 UTC10m
2026-07-10 N227SK DBQ → DBQ Jul 10, 03:00 UTCJul 10, 03:10 UTC10m
2026-07-09 N227SK DBQ → DBQ Jul 9, 23:15 UTCJul 10, 01:10 UTC1h 55m
2026-07-09 N227SK DBQ → DBQ Jul 9, 17:25 UTCJul 9, 18:15 UTC50m
2026-07-09 N227SK - Jul 9, 16:15 UTCJul 9, 16:30 UTC15m
2026-07-09 N227SK - Jul 9, 15:50 UTCJul 9, 16:10 UTC20m
2026-07-09 N227SK DBQ → DBQ Jul 9, 13:45 UTCJul 9, 14:30 UTC45m
2026-07-07 N227SK DBQ → DBQ Jul 7, 23:45 UTCJul 8, 00:40 UTC55m
2026-07-07 N227SK - Jul 7, 15:40 UTCJul 7, 16:35 UTC55m
2026-07-07 N227SK - Jul 7, 14:25 UTCJul 7, 14:45 UTC20m
2026-07-07 N227SK - Jul 7, 13:40 UTCJul 7, 14:20 UTC40m
2026-07-02 N227SK DBQ → DBQ Jul 2, 13:50 UTCJul 2, 14:35 UTC45m
2026-07-01 N227SK DBQ → DBQ Jul 1, 17:40 UTCJul 1, 18:25 UTC45m
2026-06-18 N227SK DBQ → DBQ Jun 18, 13:45 UTCJun 18, 14:45 UTC1h 0m
2026-05-29 N227SK DBQ → DBQ May 29, 21:50 UTCMay 29, 22:30 UTC40m
2026-05-27 N227SK - May 27, 16:45 UTCMay 27, 17:05 UTC20m
2026-05-27 N227SK - May 27, 16:30 UTCMay 27, 16:40 UTC10m
2026-05-27 N227SK - May 27, 16:15 UTCMay 27, 16:25 UTC10m
2026-05-22 N227SK - May 22, 18:25 UTCMay 22, 19:15 UTC50m
2026-05-21 N227SK - May 21, 16:35 UTCMay 21, 17:10 UTC35m
2026-05-21 N227SK - May 21, 15:10 UTCMay 21, 15:20 UTC10m
2026-05-21 N227SK - May 21, 14:30 UTCMay 21, 15:00 UTC30m
2026-05-20 N227SK - May 20, 15:00 UTCMay 20, 15:20 UTC20m
2026-05-20 N227SK - May 20, 14:35 UTCMay 20, 14:55 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.

Mode-S A1FC9C frequently asked

What is Mode-S code A1FC9C?
A1FC9C is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A1FC9C registered?
Mode-S code A1FC9C 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 A1FC9C broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 19:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FC9C, octal 50376234, decimal 10,615,964.
What flights does A1FC9C operate?
Mode-S A1FC9C has broadcast 1 distinct callsign, including N227SK.