Apparatus

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sensors Mode-S transponder

A1C354

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2120M · CIRRUS SR-20 · operated by GEORGES AVIATION SERVICES INC

Hex
A1C354
Octal
50341524
Decimal
10,601,300
Country
US
Tail
N2120M
Type
SR20
No current signal · last broadcast 7h ago
Flights observed
128
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A1C354.

Country allocation

The ICAO 24-bit address A1C354 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
N2120M - 128 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N2120M - Jul 14, 02:20 UTCJul 14, 03:40 UTC1h 20m
2026-07-13 N2120M - Jul 13, 02:40 UTCJul 13, 04:05 UTC1h 25m
2026-07-13 N2120M - Jul 13, 01:25 UTCJul 13, 01:55 UTC30m
2026-07-13 N2120M - Jul 13, 00:35 UTCJul 13, 00:50 UTC15m
2026-07-12 N2120M - Jul 12, 22:10 UTCJul 12, 23:10 UTC1h 0m
2026-07-12 N2120M - Jul 12, 19:20 UTCJul 12, 20:10 UTC50m
2026-07-12 N2120M - Jul 12, 17:50 UTCJul 12, 18:35 UTC45m
2026-07-11 N2120M - Jul 11, 03:01 UTCJul 11, 03:30 UTC30m
2026-07-11 N2120M - Jul 11, 00:40 UTCJul 11, 00:55 UTC15m
2026-07-10 N2120M - Jul 10, 18:55 UTCJul 10, 19:05 UTC10m
2026-07-10 N2120M - Jul 10, 02:45 UTCJul 10, 03:00 UTC15m
2026-07-09 N2120M - Jul 9, 23:55 UTCJul 10, 01:35 UTC1h 40m
2026-07-08 N2120M - Jul 8, 04:05 UTCJul 8, 05:05 UTC1h 0m
2026-07-08 N2120M - Jul 8, 02:50 UTCJul 8, 03:35 UTC45m
2026-07-08 N2120M - Jul 8, 01:55 UTCJul 8, 02:10 UTC15m
2026-07-07 N2120M - Jul 7, 01:35 UTCJul 7, 02:45 UTC1h 10m
2026-07-06 N2120M - Jul 6, 23:35 UTCJul 7, 00:30 UTC55m
2026-07-06 N2120M - Jul 6, 21:25 UTCJul 6, 22:20 UTC55m
2026-07-03 N2120M - Jul 3, 22:50 UTCJul 3, 23:00 UTC10m
2026-07-03 N2120M - Jul 3, 19:50 UTCJul 3, 21:40 UTC1h 50m
2026-07-03 N2120M - Jul 3, 00:10 UTCJul 3, 00:35 UTC25m
2026-07-02 N2120M - Jul 2, 20:35 UTCJul 2, 21:40 UTC1h 5m
2026-07-02 N2120M - Jul 2, 03:10 UTCJul 2, 04:00 UTC50m
2026-07-01 N2120M - Jul 1, 23:10 UTCJul 1, 23:40 UTC30m
2026-07-01 N2120M - Jul 1, 22:15 UTCJul 1, 22:40 UTC25m
2026-06-30 N2120M - Jun 30, 23:15 UTCJul 1, 00:35 UTC1h 20m
2026-06-30 N2120M - Jun 30, 20:20 UTCJun 30, 21:20 UTC1h 0m
2026-06-29 N2120M - Jun 29, 02:50 UTCJun 29, 03:10 UTC20m
2026-06-29 N2120M - Jun 29, 01:10 UTCJun 29, 01:44 UTC35m
2026-06-28 N2120M JRF → HNL Jun 28, 23:50 UTCJun 29, 00:14 UTC25m
2026-06-28 N2120M - Jun 28, 22:04 UTCJun 28, 22:20 UTC15m
2026-06-27 N2120M - Jun 27, 02:14 UTCJun 27, 03:04 UTC50m
2026-06-26 N2120M - Jun 26, 22:55 UTCJun 26, 23:25 UTC30m
2026-06-25 N2120M - Jun 25, 21:29 UTCJun 25, 22:10 UTC40m
2026-06-25 N2120M - Jun 25, 17:20 UTCJun 25, 18:04 UTC45m
2026-06-25 N2120M - Jun 25, 01:04 UTCJun 25, 02:30 UTC1h 25m
2026-06-24 N2120M - Jun 24, 23:59 UTCJun 25, 00:14 UTC15m
2026-06-24 N2120M - Jun 24, 23:10 UTCJun 24, 23:20 UTC10m
2026-06-24 N2120M - Jun 24, 19:15 UTCJun 24, 20:44 UTC1h 30m
2026-06-22 N2120M - Jun 22, 23:10 UTCJun 22, 23:24 UTC15m
2026-06-22 N2120M - Jun 22, 22:19 UTCJun 22, 22:40 UTC20m
2026-06-22 N2120M - Jun 22, 02:10 UTCJun 22, 02:34 UTC25m
2026-06-21 N2120M - Jun 21, 23:44 UTCJun 22, 00:24 UTC40m
2026-06-19 N2120M - Jun 19, 21:34 UTCJun 19, 22:45 UTC1h 10m
2026-06-19 N2120M - Jun 19, 17:49 UTCJun 19, 19:49 UTC2h 0m
2026-06-19 N2120M - Jun 19, 00:55 UTCJun 19, 01:29 UTC35m
2026-06-18 N2120M - Jun 18, 23:45 UTCJun 19, 00:24 UTC39m
2026-06-18 N2120M - Jun 18, 20:15 UTCJun 18, 22:10 UTC1h 55m
2026-06-18 N2120M - Jun 18, 01:20 UTCJun 18, 01:35 UTC15m
2026-06-18 N2120M - Jun 18, 00:25 UTCJun 18, 00:40 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 N2120M page for operator, model, and routing details .

Mode-S A1C354 frequently asked

What is Mode-S code A1C354?
A1C354 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2120M.
Where is Mode-S A1C354 registered?
Mode-S code A1C354 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 A1C354 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 A1C354, octal 50341524, decimal 10,601,300.
What flights does A1C354 operate?
Mode-S A1C354 has broadcast 1 distinct callsign, including N2120M.