Apparatus

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sensors Mode-S transponder

A4CDAE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4087H · MOONEY M-20 · operated by HARMONIC AIR LLC

Hex
A4CDAE
Octal
51146656
Decimal
10,800,558
Country
US
Tail
N4087H
Type
M20P
No current signal · last broadcast 2d ago
Flights observed
43
Distinct callsigns
2
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A4CDAE.

Country allocation

The ICAO 24-bit address A4CDAE 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
N4087H - 42 2026-07-12
NGF7162 - 1 2026-06-04

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-07-12 N4087H HIO → HIO Jul 12, 05:10 UTCJul 12, 05:55 UTC45m
2026-07-10 N4087H CVO → HIO Jul 10, 03:40 UTCJul 10, 04:10 UTC30m
2026-07-10 N4087H HIO → CVO Jul 10, 00:35 UTCJul 10, 01:05 UTC30m
2026-07-07 N4087H - Jul 7, 05:45 UTCJul 7, 06:15 UTC30m
2026-07-07 N4087H - Jul 7, 04:50 UTCJul 7, 05:10 UTC20m
2026-07-04 N4087H - Jul 4, 03:45 UTCJul 4, 04:15 UTC30m
2026-06-30 N4087H - Jun 30, 22:00 UTCJun 30, 22:55 UTC55m
2026-06-30 N4087H - Jun 30, 12:15 UTCJun 30, 13:05 UTC50m
2026-06-26 N4087H MFR → HIO Jun 26, 17:09 UTCJun 26, 18:29 UTC1h 20m
2026-06-26 N4087H HIO → MFR Jun 26, 13:34 UTCJun 26, 14:59 UTC1h 25m
2026-06-21 N4087H - Jun 21, 23:50 UTCJun 22, 00:34 UTC45m
2026-06-21 N4087H - Jun 21, 19:50 UTCJun 21, 21:49 UTC2h 0m
2026-06-21 N4087H - Jun 21, 14:15 UTCJun 21, 15:19 UTC1h 5m
2026-06-20 N4087H HIO → HIO Jun 20, 22:00 UTCJun 20, 22:25 UTC25m
2026-06-16 N4087H MFR → HIO Jun 16, 18:29 UTCJun 16, 19:50 UTC1h 21m
2026-06-16 N4087H HIO → MFR Jun 16, 13:34 UTCJun 16, 14:50 UTC1h 15m
2026-06-13 N4087H - Jun 13, 19:55 UTCJun 13, 20:45 UTC50m
2026-06-11 N4087H - Jun 11, 18:35 UTCJun 11, 19:30 UTC55m
2026-06-11 N4087H - Jun 11, 17:30 UTCJun 11, 18:10 UTC40m
2026-06-11 N4087H - Jun 11, 13:20 UTCJun 11, 14:05 UTC45m
2026-06-04 NGF7162 - Jun 4, 15:15 UTCJun 4, 16:25 UTC1h 10m
2026-06-04 N4087H - Jun 4, 13:15 UTCJun 4, 14:20 UTC1h 5m
2026-05-31 N4087H - May 31, 21:20 UTCMay 31, 22:20 UTC1h 0m
2026-05-31 N4087H HIO → BFI May 31, 19:45 UTCMay 31, 20:50 UTC1h 5m
2026-05-30 N4087H - May 30, 18:45 UTCMay 30, 19:45 UTC1h 0m
2026-05-30 N4087H HIO → BFI May 30, 16:50 UTCMay 30, 18:00 UTC1h 10m
2026-05-26 N4087H - May 26, 03:19 UTCMay 26, 03:50 UTC30m
2026-05-25 N4087H HIO → CVO May 25, 22:15 UTCMay 25, 22:49 UTC35m
2026-05-23 N4087H - May 23, 18:15 UTCMay 23, 18:55 UTC40m
2026-05-23 N4087H HIO → ONP May 23, 17:10 UTCMay 23, 18:05 UTC55m
2026-05-22 N4087H - May 22, 03:10 UTCMay 22, 03:40 UTC30m
2026-05-21 N4087H - May 21, 23:50 UTCMay 22, 00:20 UTC30m
2026-05-21 N4087H - May 21, 19:20 UTCMay 21, 20:15 UTC55m
2026-05-21 N4087H - May 21, 13:30 UTCMay 21, 14:30 UTC1h 0m
2026-05-20 N4087H HIO → HIO May 20, 04:40 UTCMay 20, 05:25 UTC45m
2026-05-15 N4087H - May 15, 22:45 UTCMay 15, 22:55 UTC10m
2026-05-15 N4087H - May 15, 18:15 UTCMay 15, 19:30 UTC1h 15m
2026-05-15 N4087H - May 15, 13:30 UTCMay 15, 14:45 UTC1h 15m
2026-05-15 N4087H - May 15, 02:30 UTCMay 15, 02:55 UTC25m
2026-05-14 N4087H - May 14, 23:45 UTCMay 15, 00:20 UTC35m
2026-05-11 N4087H - May 11, 06:25 UTCMay 11, 06:55 UTC30m
2026-05-11 N4087H HIO → CVO May 11, 05:25 UTCMay 11, 05:55 UTC30m
2026-05-10 N4087H HIO → HIO May 10, 22:15 UTCMay 10, 23:39 UTC1h 25m

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 N4087H page for operator, model, and routing details .

Mode-S A4CDAE frequently asked

What is Mode-S code A4CDAE?
A4CDAE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4087H.
Where is Mode-S A4CDAE registered?
Mode-S code A4CDAE 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 A4CDAE broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CDAE, octal 51146656, decimal 10,800,558.
What flights does A4CDAE operate?
Mode-S A4CDAE has broadcast 2 distinct callsigns, including N4087H, NGF7162.