Apparatus

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sensors Mode-S transponder

A5121C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N426CA · CESSNA 212 Aviocar · operated by SPITAKER LEASING LLC

Hex
A5121C
Octal
51211034
Decimal
10,818,076
Country
US
Tail
N426CA
Type
C212
No current signal · last broadcast 11h ago
Flights observed
75
Distinct callsigns
2
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A5121C.

Country allocation

The ICAO 24-bit address A5121C 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 2 distinct

Callsign Airline Flights Last seen
SHADY05 - 66 2026-06-12
N426CA - 9 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 SHADY05 - Jun 12, 18:20 UTCJun 12, 20:55 UTC2h 35m
2026-06-12 SHADY05 - Jun 12, 14:15 UTCJun 12, 16:05 UTC1h 50m
2026-06-12 SHADY05 - Jun 12, 12:05 UTCJun 12, 13:10 UTC1h 5m
2026-06-12 SHADY05 - Jun 12, 10:45 UTCJun 12, 11:10 UTC25m
2026-06-11 SHADY05 - Jun 11, 14:45 UTCJun 11, 17:15 UTC2h 30m
2026-06-11 SHADY05 - Jun 11, 11:50 UTCJun 11, 13:55 UTC2h 5m
2026-06-10 SHADY05 - Jun 10, 15:25 UTCJun 10, 16:50 UTC1h 25m
2026-06-10 SHADY05 - Jun 10, 11:50 UTCJun 10, 14:35 UTC2h 45m
2026-06-09 SHADY05 - Jun 9, 17:25 UTCJun 9, 17:45 UTC20m
2026-06-09 SHADY05 - Jun 9, 13:40 UTCJun 9, 15:50 UTC2h 10m
2026-06-09 SHADY05 - Jun 9, 11:50 UTCJun 9, 12:55 UTC1h 5m
2026-06-08 SHADY05 - Jun 8, 14:55 UTCJun 8, 16:35 UTC1h 40m
2026-06-08 SHADY05 - Jun 8, 12:00 UTCJun 8, 14:10 UTC2h 10m
2026-06-04 SHADY05 - Jun 4, 20:40 UTCJun 4, 22:45 UTC2h 5m
2026-06-04 SHADY05 - Jun 4, 19:25 UTCJun 4, 19:50 UTC25m
2026-06-04 SHADY05 - Jun 4, 19:10 UTCJun 4, 19:20 UTC10m
2026-06-04 SHADY05 - Jun 4, 18:55 UTCJun 4, 19:05 UTC10m
2026-06-04 SHADY05 - Jun 4, 18:40 UTCJun 4, 18:50 UTC10m
2026-06-04 SHADY05 - Jun 4, 18:20 UTCJun 4, 18:30 UTC10m
2026-06-04 SHADY05 - Jun 4, 17:55 UTCJun 4, 18:15 UTC20m
2026-06-04 SHADY05 - Jun 4, 17:10 UTCJun 4, 17:20 UTC10m
2026-06-04 SHADY05 - Jun 4, 16:45 UTCJun 4, 16:55 UTC10m
2026-06-04 SHADY05 - Jun 4, 16:30 UTCJun 4, 16:35 UTC5m
2026-06-04 SHADY05 - Jun 4, 16:10 UTCJun 4, 16:20 UTC10m
2026-06-04 SHADY05 - Jun 4, 15:45 UTCJun 4, 15:55 UTC10m
2026-06-04 SHADY05 - Jun 4, 15:30 UTCJun 4, 15:40 UTC10m
2026-06-04 SHADY05 - Jun 4, 14:20 UTCJun 4, 15:25 UTC1h 5m
2026-06-03 SHADY05 - Jun 3, 19:25 UTCJun 3, 21:30 UTC2h 5m
2026-06-02 N426CA - Jun 2, 20:30 UTCJun 2, 22:20 UTC1h 50m
2026-06-02 SHADY05 - Jun 2, 15:30 UTCJun 2, 17:30 UTC2h 0m
2026-06-01 N426CA - Jun 1, 18:40 UTCJun 1, 21:00 UTC2h 20m
2026-06-01 N426CA - Jun 1, 02:15 UTCJun 1, 02:55 UTC40m
2026-05-31 SHADY05 - May 31, 12:35 UTCMay 31, 14:20 UTC1h 45m
2026-05-30 SHADY05 - May 30, 18:00 UTCMay 30, 19:10 UTC1h 10m
2026-05-30 SHADY05 - May 30, 15:55 UTCMay 30, 17:00 UTC1h 5m
2026-05-29 SHADY05 - May 29, 13:50 UTCMay 29, 15:05 UTC1h 15m
2026-05-29 SHADY05 - May 29, 13:00 UTCMay 29, 13:15 UTC15m
2026-05-29 SHADY05 - May 29, 10:40 UTCMay 29, 11:20 UTC40m
2026-05-28 SHADY05 - May 28, 15:40 UTCMay 28, 15:55 UTC15m
2026-05-28 SHADY05 - May 28, 14:15 UTCMay 28, 15:05 UTC50m
2026-05-28 SHADY05 - May 28, 12:40 UTCMay 28, 13:25 UTC45m
2026-05-28 SHADY05 - May 28, 10:35 UTCMay 28, 11:15 UTC40m
2026-05-27 N426CA - May 27, 17:35 UTCMay 27, 18:35 UTC1h 0m
2026-05-27 SHADY05 - May 27, 12:25 UTCMay 27, 13:05 UTC40m
2026-05-27 SHADY05 - May 27, 10:45 UTCMay 27, 11:00 UTC15m
2026-05-26 N426CA - May 26, 20:29 UTCMay 26, 22:44 UTC2h 15m
2026-05-26 SHADY05 - May 26, 16:45 UTCMay 26, 17:50 UTC1h 5m
2026-05-26 SHADY05 - May 26, 15:29 UTCMay 26, 15:45 UTC15m
2026-05-26 SHADY05 - May 26, 14:20 UTCMay 26, 14:35 UTC15m
2026-05-26 SHADY05 - May 26, 13:24 UTCMay 26, 13:40 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 N426CA page for operator, model, and routing details .

Mode-S A5121C frequently asked

What is Mode-S code A5121C?
A5121C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N426CA.
Where is Mode-S A5121C registered?
Mode-S code A5121C 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 A5121C broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5121C, octal 51211034, decimal 10,818,076.
What flights does A5121C operate?
Mode-S A5121C has broadcast 2 distinct callsigns, including SHADY05, N426CA.