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sensors Mode-S transponder

A023FF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N108SC · BELL 407 · operated by COUNTY OF SONOMA

Hex
A023FF
Octal
50021777
Decimal
10,494,975
Country
US
Tail
N108SC
Type
B407
No current signal · last broadcast 7h ago
Flights observed
113
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A023FF.

Country allocation

The ICAO 24-bit address A023FF 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
N108SC - 112 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 N108SC - Jul 18, 00:50 UTCJul 18, 01:05 UTC15m
2026-07-17 N108SC - Jul 17, 23:05 UTCJul 17, 23:14 UTC10m
2026-07-17 N108SC - Jul 17, 00:04 UTCJul 17, 01:00 UTC55m
2026-07-16 N108SC - Jul 16, 20:49 UTCJul 16, 21:45 UTC55m
2026-07-16 N108SC - Jul 16, 03:15 UTCJul 16, 04:20 UTC1h 5m
2026-07-15 N108SC - Jul 15, 01:40 UTCJul 15, 02:25 UTC45m
2026-07-14 N108SC - Jul 14, 23:15 UTCJul 14, 23:50 UTC35m
2026-07-14 N108SC - Jul 14, 04:40 UTCJul 14, 05:35 UTC55m
2026-07-14 N108SC - Jul 14, 01:15 UTCJul 14, 01:45 UTC30m
2026-07-13 N108SC - Jul 13, 03:45 UTCJul 13, 04:20 UTC35m
2026-07-12 N108SC - Jul 12, 20:45 UTCJul 12, 21:25 UTC40m
2026-07-12 N108SC - Jul 12, 20:25 UTCJul 12, 20:40 UTC15m
2026-07-12 N108SC - Jul 12, 03:35 UTCJul 12, 04:20 UTC45m
2026-07-11 N108SC - Jul 11, 21:25 UTCJul 11, 21:55 UTC30m
2026-07-09 N108SC - Jul 9, 23:45 UTCJul 10, 00:15 UTC30m
2026-07-09 N108SC - Jul 9, 03:30 UTCJul 9, 04:10 UTC40m
2026-07-09 N108SC - Jul 9, 01:15 UTCJul 9, 01:45 UTC30m
2026-07-07 N108SC - Jul 7, 03:00 UTCJul 7, 03:10 UTC10m
2026-07-06 N108SC - Jul 6, 22:50 UTCJul 6, 23:35 UTC45m
2026-07-06 N108SC - Jul 6, 22:15 UTCJul 6, 22:45 UTC30m
2026-07-06 N108SC - Jul 6, 03:25 UTCJul 6, 04:05 UTC40m
2026-07-05 N108SC - Jul 5, 21:05 UTCJul 5, 21:50 UTC45m
2026-07-05 N108SC - Jul 5, 03:35 UTCJul 5, 04:35 UTC1h 0m
2026-07-04 N108SC - Jul 4, 16:55 UTCJul 4, 17:35 UTC40m
2026-07-04 N108SC - Jul 4, 01:20 UTCJul 4, 01:35 UTC15m
2026-07-03 N108SC - Jul 3, 03:15 UTCJul 3, 03:45 UTC30m
2026-07-03 N108SC - Jul 3, 00:25 UTCJul 3, 01:35 UTC1h 10m
2026-07-02 N108SC - Jul 2, 01:15 UTCJul 2, 01:55 UTC40m
2026-07-01 N108SC - Jul 1, 21:45 UTCJul 1, 22:00 UTC15m
2026-07-01 N108SC - Jul 1, 01:10 UTCJul 1, 01:30 UTC20m
2026-06-29 N108SC - Jun 29, 04:04 UTCJun 29, 04:45 UTC40m
2026-06-28 N108SC - Jun 28, 23:39 UTCJun 28, 23:50 UTC10m
2026-06-28 N108SC - Jun 28, 03:59 UTCJun 28, 04:40 UTC40m
2026-06-26 N108SC - Jun 26, 23:34 UTCJun 26, 23:44 UTC10m
2026-06-26 N108SC - Jun 26, 22:14 UTCJun 26, 22:25 UTC10m
2026-06-26 N108SC - Jun 26, 03:54 UTCJun 26, 04:14 UTC20m
2026-06-25 N108SC - Jun 25, 01:54 UTCJun 25, 03:10 UTC1h 15m
2026-06-23 N108SC - Jun 23, 22:19 UTCJun 23, 22:40 UTC20m
2026-06-23 N108SC - Jun 23, 21:05 UTCJun 23, 21:39 UTC35m
2026-06-22 N108SC - Jun 22, 21:59 UTCJun 22, 22:54 UTC55m
2026-06-21 N108SC - Jun 21, 03:10 UTCJun 21, 03:59 UTC50m
2026-06-20 N108SC - Jun 20, 22:20 UTCJun 20, 23:19 UTC1h 0m
2026-06-19 N108SC - Jun 19, 00:00 UTCJun 19, 00:49 UTC49m
2026-06-18 N108SC - Jun 18, 04:45 UTCJun 18, 05:00 UTC15m
2026-06-18 N108SC - Jun 18, 03:40 UTCJun 18, 04:00 UTC20m
2026-06-17 N108SC - Jun 17, 01:50 UTCJun 17, 02:15 UTC25m
2026-06-16 N108SC - Jun 16, 03:20 UTCJun 16, 03:30 UTC10m
2026-06-14 N108SC - Jun 14, 19:15 UTCJun 14, 19:25 UTC10m
2026-06-14 N108SC - Jun 14, 03:20 UTCJun 14, 04:00 UTC40m
2026-06-13 N108SC - Jun 13, 19:45 UTCJun 13, 20:00 UTC15m

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 N108SC page for operator, model, and routing details .

Mode-S A023FF frequently asked

What is Mode-S code A023FF?
A023FF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N108SC.
Where is Mode-S A023FF registered?
Mode-S code A023FF 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 A023FF broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A023FF, octal 50021777, decimal 10,494,975.
What flights does A023FF operate?
Mode-S A023FF has broadcast 1 distinct callsign, including N108SC.