Apparatus

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sensors Mode-S transponder

A11D24

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N171CP · CESSNA 172 Skyhawk · operated by CIVIL AIR PATROL

Hex
A11D24
Octal
50216444
Decimal
10,558,756
Country
US
Tail
N171CP
Type
C172
No current signal · last broadcast 1d ago
Flights observed
61
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A11D24.

Country allocation

The ICAO 24-bit address A11D24 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
CAP471 - 61 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 CAP471 - Jun 29, 00:00 UTCJun 29, 00:49 UTC50m
2026-06-28 CAP471 - Jun 28, 23:09 UTCJun 28, 23:39 UTC30m
2026-06-28 CAP471 - Jun 28, 22:04 UTCJun 28, 22:34 UTC30m
2026-06-28 CAP471 - Jun 28, 20:54 UTCJun 28, 21:30 UTC35m
2026-06-28 CAP471 - Jun 28, 18:44 UTCJun 28, 20:09 UTC1h 25m
2026-06-28 CAP471 SMO → SMO Jun 28, 16:55 UTCJun 28, 18:14 UTC1h 20m
2026-06-27 CAP471 - Jun 27, 21:34 UTCJun 27, 22:15 UTC40m
2026-06-27 CAP471 - Jun 27, 20:19 UTCJun 27, 20:55 UTC35m
2026-06-27 CAP471 - Jun 27, 18:39 UTCJun 27, 19:39 UTC1h 0m
2026-06-27 CAP471 - Jun 27, 17:25 UTCJun 27, 17:39 UTC15m
2026-06-27 CAP471 SMO → EMT Jun 27, 16:35 UTCJun 27, 16:49 UTC15m
2026-06-13 CAP471 - Jun 13, 21:10 UTCJun 13, 21:50 UTC40m
2026-06-13 CAP471 - Jun 13, 20:55 UTCJun 13, 21:05 UTC10m
2026-06-13 CAP471 SMO → WHP Jun 13, 20:25 UTCJun 13, 20:40 UTC15m
2026-06-12 CAP471 - Jun 12, 01:35 UTCJun 12, 01:50 UTC15m
2026-06-12 CAP471 WHP → WHP Jun 12, 01:20 UTCJun 12, 01:25 UTC5m
2026-06-12 CAP471 SMO → WHP Jun 12, 00:00 UTCJun 12, 01:15 UTC1h 16m
2026-06-11 CAP471 SMO → SMO Jun 11, 21:20 UTCJun 11, 22:15 UTC55m
2026-06-10 CAP471 SMO → SMO Jun 10, 01:00 UTCJun 10, 02:10 UTC1h 10m
2026-06-06 CAP471 WHP → SMO Jun 6, 23:39 UTCJun 6, 23:55 UTC15m
2026-06-06 CAP471 WHP → WHP Jun 6, 20:55 UTCJun 6, 22:25 UTC1h 30m
2026-06-06 CAP471 - Jun 6, 19:44 UTCJun 6, 20:10 UTC25m
2026-06-06 CAP471 - Jun 6, 18:25 UTCJun 6, 18:39 UTC15m
2026-06-06 CAP471 SMO → WHP Jun 6, 16:55 UTCJun 6, 17:24 UTC30m
2026-06-05 CAP471 WHP → SMO Jun 5, 21:45 UTCJun 5, 22:00 UTC15m
2026-06-05 CAP471 RAL → WHP Jun 5, 20:25 UTCJun 5, 20:55 UTC30m
2026-06-05 CAP471 SMO → RAL Jun 5, 18:05 UTCJun 5, 19:00 UTC55m
2026-06-03 CAP471 - Jun 3, 05:05 UTCJun 3, 05:45 UTC40m
2026-06-02 CAP471 - Jun 2, 23:55 UTCJun 3, 01:50 UTC1h 55m
2026-06-02 CAP471 SMO → FUL Jun 2, 22:10 UTCJun 2, 22:45 UTC35m
2026-06-02 CAP471 RIV → SMO Jun 2, 00:15 UTCJun 2, 01:05 UTC50m
2026-06-01 CAP471 - Jun 1, 22:45 UTCJun 1, 23:05 UTC20m
2026-06-01 CAP471 - Jun 1, 21:45 UTCJun 1, 21:50 UTC5m
2026-06-01 CAP471 RIR → SBD Jun 1, 20:10 UTCJun 1, 20:25 UTC15m
2026-06-01 CAP471 - Jun 1, 19:20 UTCJun 1, 19:30 UTC10m
2026-06-01 CAP471 SMO → RAL Jun 1, 17:30 UTCJun 1, 18:35 UTC1h 5m
2026-05-31 CAP471 BFL → SMO May 31, 20:55 UTCMay 31, 22:05 UTC1h 10m
2026-05-31 CAP471 BFL → BFL May 31, 16:35 UTCMay 31, 18:05 UTC1h 30m
2026-05-30 CAP471 BFL → BFL May 30, 21:30 UTCMay 30, 23:55 UTC2h 25m
2026-05-30 CAP471 BFL → BFL May 30, 18:25 UTCMay 30, 19:55 UTC1h 30m
2026-05-29 CAP471 SMO → BFL May 29, 17:05 UTCMay 29, 18:10 UTC1h 5m
2026-05-28 CAP471 - May 28, 01:10 UTCMay 28, 01:25 UTC15m
2026-05-28 CAP471 - May 28, 00:00 UTCMay 28, 00:35 UTC35m
2026-05-27 CAP471 WHP → WHP May 27, 22:10 UTCMay 27, 23:40 UTC1h 30m
2026-05-27 CAP471 SMO → WHP May 27, 21:00 UTCMay 27, 21:15 UTC15m
2026-05-27 CAP471 - May 27, 19:15 UTCMay 27, 20:00 UTC45m
2026-05-27 CAP471 - May 27, 17:25 UTCMay 27, 17:50 UTC25m
2026-05-27 CAP471 - May 27, 14:30 UTCMay 27, 15:50 UTC1h 20m
2026-05-26 CAP471 CPM → HHR May 26, 21:55 UTCMay 26, 22:05 UTC10m
2026-05-26 CAP471 - May 26, 20:50 UTCMay 26, 21:04 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 N171CP page for operator, model, and routing details .

Mode-S A11D24 frequently asked

What is Mode-S code A11D24?
A11D24 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N171CP.
Where is Mode-S A11D24 registered?
Mode-S code A11D24 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 A11D24 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11D24, octal 50216444, decimal 10,558,756.
What flights does A11D24 operate?
Mode-S A11D24 has broadcast 1 distinct callsign, including CAP471.