Apparatus

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sensors Mode-S transponder

A544CD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N439CP · CESSNA TR182 Turbo Skylane RG · operated by CIVIL AIR PATROL

Hex
A544CD
Octal
51242315
Decimal
10,831,053
Country
US
Tail
N439CP
Type
C82T
No current signal · last broadcast 4d ago
Flights observed
71
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A544CD.

Country allocation

The ICAO 24-bit address A544CD 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
CAP2158 - 71 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAP2158 - Jul 26, 17:10 UTCJul 26, 17:45 UTC35m
2026-07-26 CAP2158 - Jul 26, 14:05 UTCJul 26, 14:40 UTC35m
2026-07-25 CAP2158 - Jul 25, 18:10 UTCJul 25, 19:00 UTC50m
2026-07-25 CAP2158 - Jul 25, 15:15 UTCJul 25, 16:05 UTC50m
2026-07-24 CAP2158 - Jul 24, 19:45 UTCJul 24, 20:00 UTC15m
2026-07-24 CAP2158 - Jul 24, 18:10 UTCJul 24, 18:45 UTC35m
2026-07-22 CAP2158 FCM → FCM Jul 22, 21:30 UTCJul 22, 22:35 UTC1h 5m
2026-07-21 CAP2158 - Jul 21, 02:10 UTCJul 21, 03:25 UTC1h 15m
2026-07-20 CAP2158 FCM → FCM Jul 20, 23:40 UTCJul 21, 00:40 UTC1h 0m
2026-07-20 CAP2158 FCM → FCM Jul 20, 21:05 UTCJul 20, 22:10 UTC1h 5m
2026-07-20 CAP2158 FCM → FCM Jul 20, 19:00 UTCJul 20, 20:00 UTC1h 0m
2026-07-19 CAP2158 FCM → FCM Jul 19, 16:10 UTCJul 19, 17:05 UTC55m
2026-07-19 CAP2158 FCM → FCM Jul 19, 14:10 UTCJul 19, 15:05 UTC55m
2026-07-18 CAP2158 - Jul 18, 22:10 UTCJul 18, 22:30 UTC20m
2026-07-18 CAP2158 - Jul 18, 18:15 UTCJul 18, 21:20 UTC3h 5m
2026-07-18 CAP2158 - Jul 18, 16:50 UTCJul 18, 17:40 UTC50m
2026-07-18 CAP2158 - Jul 18, 13:35 UTCJul 18, 16:20 UTC2h 45m
2026-07-15 CAP2158 FCM → FCM Jul 15, 19:10 UTCJul 15, 20:30 UTC1h 20m
2026-07-12 CAP2158 - Jul 12, 22:45 UTCJul 12, 23:35 UTC50m
2026-07-12 CAP2158 - Jul 12, 11:45 UTCJul 12, 13:05 UTC1h 20m
2026-07-11 CAP2158 FCM → FCM Jul 11, 16:45 UTCJul 11, 18:50 UTC2h 5m
2026-07-10 CAP2158 - Jul 10, 17:15 UTCJul 10, 17:35 UTC20m
2026-07-10 CAP2158 - Jul 10, 15:40 UTCJul 10, 16:00 UTC20m
2026-07-09 CAP2158 - Jul 9, 00:05 UTCJul 9, 01:40 UTC1h 35m
2026-07-08 CAP2158 FCM → FCM Jul 8, 00:50 UTCJul 8, 02:05 UTC1h 15m
2026-06-30 CAP2158 FCM → FCM Jun 30, 21:20 UTCJun 30, 22:45 UTC1h 25m
2026-06-30 CAP2158 - Jun 30, 17:20 UTCJun 30, 18:15 UTC55m
2026-06-27 CAP2158 MIC → FCM Jun 27, 17:25 UTCJun 27, 17:44 UTC20m
2026-06-27 CAP2158 - Jun 27, 13:15 UTCJun 27, 13:24 UTC10m
2026-06-27 CAP2158 - Jun 27, 05:15 UTCJun 27, 05:25 UTC10m
2026-06-27 CAP2158 - Jun 27, 02:55 UTCJun 27, 04:34 UTC1h 40m
2026-06-26 CAP2158 - Jun 26, 18:54 UTCJun 26, 19:39 UTC45m
2026-06-26 CAP2158 - Jun 26, 17:40 UTCJun 26, 17:59 UTC20m
2026-06-26 CAP2158 - Jun 26, 13:24 UTCJun 26, 14:25 UTC1h 0m
2026-06-24 CAP2158 - Jun 24, 17:55 UTCJun 24, 18:20 UTC25m
2026-06-24 CAP2158 - Jun 24, 16:19 UTCJun 24, 16:59 UTC40m
2026-06-20 CAP2158 - Jun 20, 17:34 UTCJun 20, 18:04 UTC30m
2026-06-20 CAP2158 - Jun 20, 15:14 UTCJun 20, 15:54 UTC40m
2026-06-18 CAP2158 - Jun 18, 23:40 UTCJun 19, 00:34 UTC54m
2026-06-18 CAP2158 - Jun 18, 19:45 UTCJun 18, 20:00 UTC15m
2026-06-18 CAP2158 - Jun 18, 16:40 UTCJun 18, 18:00 UTC1h 20m
2026-06-12 CAP2158 - Jun 12, 12:50 UTCJun 12, 13:05 UTC15m
2026-06-10 CAP2158 - Jun 10, 02:15 UTCJun 10, 03:15 UTC1h 0m
2026-06-09 CAP2158 - Jun 9, 19:50 UTCJun 9, 20:45 UTC55m
2026-06-09 CAP2158 - Jun 9, 02:50 UTCJun 9, 04:15 UTC1h 25m
2026-06-08 CAP2158 - Jun 8, 22:20 UTCJun 8, 23:50 UTC1h 30m
2026-06-06 CAP2158 - Jun 6, 17:40 UTCJun 6, 20:00 UTC2h 20m
2026-06-06 CAP2158 - Jun 6, 13:44 UTCJun 6, 15:50 UTC2h 5m
2026-06-03 CAP2158 - Jun 3, 23:40 UTCJun 3, 23:45 UTC5m
2026-06-03 CAP2158 - Jun 3, 22:15 UTCJun 3, 23:25 UTC1h 10m

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 N439CP page for operator, model, and routing details .

Mode-S A544CD frequently asked

What is Mode-S code A544CD?
A544CD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N439CP.
Where is Mode-S A544CD registered?
Mode-S code A544CD 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 A544CD broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A544CD, octal 51242315, decimal 10,831,053.
What flights does A544CD operate?
Mode-S A544CD has broadcast 1 distinct callsign, including CAP2158.