Apparatus

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sensors Mode-S transponder

A1C82C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2138W · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A1C82C
Octal
50344054
Decimal
10,602,540
Country
US
Tail
N2138W
Type
C172
No current signal · last broadcast 8h ago
Flights observed
64
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A1C82C.

Country allocation

The ICAO 24-bit address A1C82C 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
N2138W - 64 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 N2138W ECG → TTN May 30, 00:20 UTCMay 30, 03:10 UTC2h 50m
2026-05-29 N2138W - May 29, 20:40 UTCMay 29, 23:30 UTC2h 50m
2026-05-29 N2138W - May 29, 10:50 UTCMay 29, 11:45 UTC55m
2026-05-28 N2138W - May 28, 02:00 UTCMay 28, 03:30 UTC1h 30m
2026-05-20 N2138W TTN → TTN May 20, 16:10 UTCMay 20, 16:50 UTC40m
2026-05-19 N2138W - May 19, 15:30 UTCMay 19, 17:20 UTC1h 50m
2026-05-17 N2138W - May 17, 16:40 UTCMay 17, 17:40 UTC1h 0m
2026-05-17 N2138W - May 17, 14:55 UTCMay 17, 15:50 UTC55m
2026-05-17 N2138W - May 17, 13:15 UTCMay 17, 13:50 UTC35m
2026-05-17 N2138W TTN → TTN May 17, 01:00 UTCMay 17, 01:35 UTC35m
2026-05-16 N2138W - May 16, 17:25 UTCMay 16, 17:55 UTC30m
2026-05-15 N2138W - May 15, 14:35 UTCMay 15, 15:40 UTC1h 4m
2026-05-14 N2138W - May 14, 16:00 UTCMay 14, 17:10 UTC1h 10m
2026-05-12 N2138W - May 12, 19:50 UTCMay 12, 21:01 UTC1h 10m
2026-05-12 N2138W - May 12, 15:55 UTCMay 12, 16:40 UTC45m
2026-05-04 N2138W - May 4, 16:10 UTCMay 4, 16:50 UTC40m
2026-05-04 N2138W TTN → TTN May 4, 13:15 UTCMay 4, 13:50 UTC35m
2026-05-03 N2138W TTN → TTN May 3, 10:30 UTCMay 3, 12:40 UTC2h 10m
2026-05-02 N2138W TTN → TTN May 2, 16:30 UTCMay 2, 17:35 UTC1h 5m
2026-05-01 N2138W - May 1, 22:30 UTCMay 1, 23:50 UTC1h 20m
2026-04-29 N2138W - Apr 29, 18:25 UTCApr 29, 19:45 UTC1h 20m
2026-04-29 N2138W - Apr 29, 13:35 UTCApr 29, 14:50 UTC1h 15m
2026-04-27 N2138W - Apr 27, 16:35 UTCApr 27, 17:45 UTC1h 10m
2026-04-27 N2138W TTN → TTN Apr 27, 12:55 UTCApr 27, 14:00 UTC1h 5m
2026-04-27 N2138W - Apr 27, 10:55 UTCApr 27, 11:50 UTC55m
2026-04-26 N2138W - Apr 26, 22:20 UTCApr 27, 00:20 UTC2h 0m
2026-04-24 N2138W - Apr 24, 10:55 UTCApr 24, 12:15 UTC1h 20m
2026-04-23 N2138W - Apr 23, 21:15 UTCApr 23, 22:45 UTC1h 30m
2026-04-23 N2138W - Apr 23, 19:05 UTCApr 23, 20:00 UTC55m
2026-04-23 N2138W - Apr 23, 16:40 UTCApr 23, 17:50 UTC1h 10m
2026-04-23 N2138W - Apr 23, 14:20 UTCApr 23, 15:35 UTC1h 15m
2026-04-23 N2138W - Apr 23, 10:55 UTCApr 23, 11:45 UTC50m
2026-04-21 N2138W - Apr 21, 21:35 UTCApr 21, 23:10 UTC1h 35m
2026-04-21 N2138W - Apr 21, 13:30 UTCApr 21, 14:40 UTC1h 10m
2026-04-21 N2138W - Apr 21, 11:00 UTCApr 21, 12:01 UTC1h 0m
2026-04-18 N2138W - Apr 18, 03:25 UTCApr 18, 04:35 UTC1h 10m
2026-04-18 N2138W - Apr 18, 02:20 UTCApr 18, 03:20 UTC1h 0m
2026-04-18 N2138W - Apr 18, 01:25 UTCApr 18, 01:45 UTC20m
2026-04-17 N2138W - Apr 17, 23:40 UTCApr 18, 01:20 UTC1h 40m
2026-04-17 N2138W - Apr 17, 17:25 UTCApr 17, 17:45 UTC20m
2026-04-17 N2138W - Apr 17, 16:40 UTCApr 17, 17:10 UTC30m
2026-04-16 N2138W - Apr 16, 15:25 UTCApr 16, 16:05 UTC40m
2026-04-16 N2138W - Apr 16, 11:09 UTCApr 16, 13:00 UTC1h 50m
2026-04-16 N2138W - Apr 16, 10:40 UTCApr 16, 11:04 UTC25m
2026-04-16 N2138W - Apr 16, 01:10 UTCApr 16, 02:00 UTC50m
2026-04-15 N2138W - Apr 15, 23:10 UTCApr 16, 01:05 UTC1h 55m
2026-04-15 N2138W - Apr 15, 15:05 UTCApr 15, 16:10 UTC1h 5m
2026-04-15 N2138W - Apr 15, 13:55 UTCApr 15, 14:45 UTC49m
2026-04-15 N2138W - Apr 15, 07:01 UTCApr 15, 08:35 UTC1h 35m
2026-04-15 N2138W - Apr 15, 05:25 UTCApr 15, 06:55 UTC1h 30m

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 N2138W page for operator, model, and routing details .

Mode-S A1C82C frequently asked

What is Mode-S code A1C82C?
A1C82C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2138W.
Where is Mode-S A1C82C registered?
Mode-S code A1C82C 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 A1C82C broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1C82C, octal 50344054, decimal 10,602,540.
What flights does A1C82C operate?
Mode-S A1C82C has broadcast 1 distinct callsign, including N2138W.