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sensors Mode-S transponder

A1C3AB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N21224 · CESSNA 182 Skylane · operated by TREGRE GARY, TREGRE MARTHA

Hex
A1C3AB
Octal
50341653
Decimal
10,601,387
Country
US
Tail
N21224
Type
C182
No current signal · last broadcast Jul 25, 23:45 UTC
Flights observed
75
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 23:45 UTC

Last known position

Most recent position reported by Mode-S A1C3AB.

Country allocation

The ICAO 24-bit address A1C3AB 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
N21224 - 75 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N21224 - Jul 25, 22:45 UTCJul 25, 23:45 UTC1h 0m
2026-07-25 N21224 - Jul 25, 20:55 UTCJul 25, 21:45 UTC50m
2026-07-25 N21224 - Jul 25, 18:50 UTCJul 25, 20:05 UTC1h 15m
2026-07-25 N21224 - Jul 25, 13:35 UTCJul 25, 16:45 UTC3h 10m
2026-07-24 N21224 - Jul 24, 11:25 UTCJul 24, 15:00 UTC3h 35m
2026-07-19 N21224 - Jul 19, 20:50 UTCJul 19, 21:05 UTC15m
2026-07-19 N21224 - Jul 19, 19:55 UTCJul 19, 20:10 UTC15m
2026-07-19 N21224 - Jul 19, 15:25 UTCJul 19, 18:10 UTC2h 45m
2026-07-18 N21224 - Jul 18, 13:15 UTCJul 18, 15:15 UTC2h 0m
2026-07-18 N21224 - Jul 18, 00:04 UTCJul 18, 00:35 UTC30m
2026-07-17 N21224 - Jul 17, 22:55 UTCJul 17, 23:30 UTC35m
2026-07-17 N21224 - Jul 17, 20:20 UTCJul 17, 20:55 UTC35m
2026-07-17 N21224 - Jul 17, 13:15 UTCJul 17, 14:15 UTC1h 0m
2026-07-13 N21224 - Jul 13, 03:10 UTCJul 13, 04:20 UTC1h 10m
2026-07-13 N21224 - Jul 13, 02:05 UTCJul 13, 02:30 UTC25m
2026-07-12 N21224 - Jul 12, 21:35 UTCJul 12, 22:15 UTC40m
2026-07-12 N21224 - Jul 12, 13:30 UTCJul 12, 14:35 UTC1h 5m
2026-07-09 N21224 - Jul 9, 02:40 UTCJul 9, 02:55 UTC15m
2026-07-05 N21224 - Jul 5, 21:10 UTCJul 5, 23:15 UTC2h 5m
2026-07-05 N21224 - Jul 5, 19:10 UTCJul 5, 20:25 UTC1h 15m
2026-07-05 N21224 - Jul 5, 18:05 UTCJul 5, 18:40 UTC35m
2026-07-04 N21224 - Jul 4, 00:20 UTCJul 4, 03:05 UTC2h 45m
2026-07-03 N21224 - Jul 3, 19:55 UTCJul 3, 20:40 UTC45m
2026-07-03 N21224 - Jul 3, 00:50 UTCJul 3, 01:30 UTC40m
2026-07-01 N21224 - Jul 1, 00:30 UTCJul 1, 00:55 UTC25m
2026-06-28 N21224 - Jun 28, 16:05 UTCJun 28, 16:19 UTC15m
2026-06-28 N21224 - Jun 28, 14:25 UTCJun 28, 14:59 UTC35m
2026-06-28 N21224 - Jun 28, 10:04 UTCJun 28, 10:50 UTC45m
2026-06-25 N21224 - Jun 25, 15:10 UTCJun 25, 15:29 UTC20m
2026-06-25 N21224 - Jun 25, 10:55 UTCJun 25, 13:09 UTC2h 15m
2026-06-25 N21224 - Jun 25, 03:29 UTCJun 25, 03:59 UTC30m
2026-06-25 N21224 - Jun 25, 01:44 UTCJun 25, 02:10 UTC25m
2026-06-25 N21224 - Jun 25, 00:29 UTCJun 25, 00:55 UTC25m
2026-06-23 N21224 - Jun 23, 15:50 UTCJun 23, 16:09 UTC20m
2026-06-23 N21224 - Jun 23, 00:30 UTCJun 23, 00:54 UTC25m
2026-06-19 N21224 - Jun 19, 01:24 UTCJun 19, 01:45 UTC20m
2026-06-12 N21224 - Jun 12, 01:55 UTCJun 12, 02:25 UTC30m
2026-06-07 N21224 - Jun 7, 22:50 UTCJun 7, 23:00 UTC10m
2026-06-07 N21224 - Jun 7, 20:15 UTCJun 7, 20:30 UTC15m
2026-06-05 N21224 - Jun 5, 23:25 UTCJun 5, 23:35 UTC10m
2026-06-04 N21224 - Jun 4, 18:30 UTCJun 4, 18:45 UTC15m
2026-05-31 N21224 - May 31, 21:50 UTCJun 1, 00:45 UTC2h 55m
2026-05-31 N21224 - May 31, 17:10 UTCMay 31, 19:50 UTC2h 40m
2026-05-30 N21224 - May 30, 19:35 UTCMay 30, 19:55 UTC20m
2026-05-29 N21224 - May 29, 17:05 UTCMay 29, 19:50 UTC2h 45m
2026-05-29 N21224 - May 29, 13:30 UTCMay 29, 16:30 UTC3h 1m
2026-05-29 N21224 - May 29, 01:00 UTCMay 29, 02:20 UTC1h 20m
2026-05-28 N21224 - May 28, 01:10 UTCMay 28, 02:25 UTC1h 15m
2026-05-27 N21224 - May 27, 23:25 UTCMay 27, 23:40 UTC15m
2026-05-27 N21224 - May 27, 22:10 UTCMay 27, 22:35 UTC25m

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 N21224 page for operator, model, and routing details .

Mode-S A1C3AB frequently asked

What is Mode-S code A1C3AB?
A1C3AB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N21224.
Where is Mode-S A1C3AB registered?
Mode-S code A1C3AB 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 A1C3AB broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 23:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1C3AB, octal 50341653, decimal 10,601,387.
What flights does A1C3AB operate?
Mode-S A1C3AB has broadcast 1 distinct callsign, including N21224.