Apparatus

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sensors Mode-S transponder

A4CA20

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4078P · ROBINSON R-22 Mariner · operated by HAWAII PACIFIC AVIATION INC

Hex
A4CA20
Octal
51145040
Decimal
10,799,648
Country
US
Tail
N4078P
Type
R22
No current signal · last broadcast 13h ago
Flights observed
223
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A4CA20.

Country allocation

The ICAO 24-bit address A4CA20 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
N4078P - 223 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N4078P KOA → KOA Jul 13, 21:40 UTCJul 13, 22:05 UTC25m
2026-07-13 N4078P KOA → KOA Jul 13, 19:20 UTCJul 13, 20:35 UTC1h 15m
2026-07-12 N4078P KOA → KOA Jul 12, 23:40 UTCJul 13, 00:20 UTC40m
2026-07-12 N4078P KOA → KOA Jul 12, 21:40 UTCJul 12, 22:30 UTC50m
2026-07-12 N4078P KOA → KOA Jul 12, 18:10 UTCJul 12, 18:45 UTC35m
2026-07-12 N4078P KOA → KOA Jul 12, 01:00 UTCJul 12, 02:25 UTC1h 25m
2026-07-11 N4078P KOA → KOA Jul 11, 21:40 UTCJul 11, 22:05 UTC25m
2026-07-08 N4078P KOA → KOA Jul 8, 23:35 UTCJul 9, 00:10 UTC35m
2026-07-08 N4078P KOA → KOA Jul 8, 21:20 UTCJul 8, 22:05 UTC45m
2026-07-08 N4078P KOA → KOA Jul 8, 19:25 UTCJul 8, 20:00 UTC35m
2026-07-08 N4078P KOA → KOA Jul 8, 17:35 UTCJul 8, 18:20 UTC45m
2026-07-07 N4078P KOA → KOA Jul 7, 18:05 UTCJul 7, 18:40 UTC35m
2026-07-06 N4078P KOA → KOA Jul 6, 23:40 UTCJul 7, 00:15 UTC35m
2026-07-06 N4078P KOA → KOA Jul 6, 21:35 UTCJul 6, 22:25 UTC50m
2026-07-06 N4078P KOA → KOA Jul 6, 19:15 UTCJul 6, 20:00 UTC45m
2026-07-06 N4078P KOA → KOA Jul 6, 03:45 UTCJul 6, 04:05 UTC20m
2026-07-05 N4078P KOA → KOA Jul 5, 23:25 UTCJul 6, 00:35 UTC1h 10m
2026-07-05 N4078P KOA → KOA Jul 5, 21:45 UTCJul 5, 22:25 UTC40m
2026-07-04 N4078P KOA → KOA Jul 4, 03:55 UTCJul 4, 04:30 UTC35m
2026-07-04 N4078P KOA → KOA Jul 4, 01:20 UTCJul 4, 02:05 UTC45m
2026-07-03 N4078P KOA → KOA Jul 3, 23:25 UTCJul 4, 00:15 UTC50m
2026-07-03 N4078P KOA → KOA Jul 3, 19:45 UTCJul 3, 20:15 UTC30m
2026-07-03 N4078P - Jul 3, 18:45 UTCJul 3, 19:05 UTC20m
2026-07-03 N4078P KOA → KOA Jul 3, 02:00 UTCJul 3, 02:30 UTC30m
2026-07-02 N4078P KOA → KOA Jul 2, 01:35 UTCJul 2, 01:55 UTC20m
2026-07-01 N4078P KOA → KOA Jul 1, 23:30 UTCJul 2, 00:20 UTC50m
2026-07-01 N4078P - Jul 1, 21:55 UTCJul 1, 22:15 UTC20m
2026-07-01 N4078P KOA → KOA Jul 1, 19:40 UTCJul 1, 20:05 UTC25m
2026-07-01 N4078P KOA → KOA Jul 1, 17:55 UTCJul 1, 18:35 UTC40m
2026-07-01 N4078P - Jul 1, 04:40 UTCJul 1, 05:00 UTC20m
2026-07-01 N4078P KOA → KOA Jul 1, 01:30 UTCJul 1, 02:15 UTC45m
2026-06-30 N4078P KOA → KOA Jun 30, 21:00 UTCJun 30, 21:45 UTC45m
2026-06-30 N4078P KOA → KOA Jun 30, 19:20 UTCJun 30, 19:55 UTC35m
2026-06-30 N4078P KOA → KOA Jun 30, 01:30 UTCJun 30, 02:15 UTC45m
2026-06-29 N4078P KOA → KOA Jun 29, 23:29 UTCJun 30, 00:20 UTC50m
2026-06-29 N4078P KOA → KOA Jun 29, 01:34 UTCJun 29, 02:00 UTC25m
2026-06-28 N4078P KOA → KOA Jun 28, 23:39 UTCJun 29, 00:14 UTC35m
2026-06-28 N4078P KOA → KOA Jun 28, 21:40 UTCJun 28, 22:04 UTC25m
2026-06-28 N4078P KOA → KOA Jun 28, 01:19 UTCJun 28, 02:14 UTC55m
2026-06-27 N4078P - Jun 27, 17:34 UTCJun 27, 17:59 UTC25m
2026-06-27 N4078P - Jun 27, 16:49 UTCJun 27, 16:59 UTC10m
2026-06-27 N4078P KOA → KOA Jun 27, 01:44 UTCJun 27, 02:09 UTC25m
2026-06-26 N4078P KOA → KOA Jun 26, 23:34 UTCJun 27, 00:25 UTC50m
2026-06-26 N4078P KOA → KOA Jun 26, 21:24 UTCJun 26, 22:29 UTC1h 5m
2026-06-26 N4078P - Jun 26, 16:39 UTCJun 26, 16:49 UTC10m
2026-06-26 N4078P KOA → KOA Jun 26, 05:35 UTCJun 26, 05:50 UTC15m
2026-06-25 N4078P KOA → KOA Jun 25, 23:49 UTCJun 26, 00:20 UTC30m
2026-06-25 N4078P KOA → KOA Jun 25, 21:10 UTCJun 25, 21:55 UTC45m
2026-06-25 N4078P KOA → KOA Jun 25, 19:44 UTCJun 25, 20:39 UTC55m
2026-06-25 N4078P KOA → KOA Jun 25, 17:30 UTCJun 25, 18:04 UTC35m

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 N4078P page for operator, model, and routing details .

Mode-S A4CA20 frequently asked

What is Mode-S code A4CA20?
A4CA20 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4078P.
Where is Mode-S A4CA20 registered?
Mode-S code A4CA20 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 A4CA20 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CA20, octal 51145040, decimal 10,799,648.
What flights does A4CA20 operate?
Mode-S A4CA20 has broadcast 1 distinct callsign, including N4078P.