Apparatus

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sensors Mode-S transponder

A4BF72

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405CM · ROBINSON R-22 Mariner · operated by HAWAII PACIFIC AVIATION INC

Hex
A4BF72
Octal
51137562
Decimal
10,796,914
Country
US
Tail
N405CM
Type
R22
No current signal · last broadcast 7h ago
Flights observed
320
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A4BF72.

Country allocation

The ICAO 24-bit address A4BF72 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
N405CM - 320 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N405CM KOA → KOA Jul 14, 06:20 UTCJul 14, 06:35 UTC15m
2026-07-14 N405CM KOA → KOA Jul 14, 05:55 UTCJul 14, 06:15 UTC20m
2026-07-14 N405CM - Jul 14, 02:30 UTCJul 14, 02:45 UTC15m
2026-07-14 N405CM - Jul 14, 01:30 UTCJul 14, 01:40 UTC10m
2026-07-14 N405CM KOA → KOA Jul 14, 00:25 UTCJul 14, 00:30 UTC5m
2026-07-14 N405CM KOA → KOA Jul 14, 00:10 UTCJul 14, 00:15 UTC5m
2026-07-13 N405CM KOA → KOA Jul 13, 23:40 UTCJul 14, 00:05 UTC25m
2026-07-13 N405CM KOA → KOA Jul 13, 17:40 UTCJul 13, 18:55 UTC1h 15m
2026-07-13 N405CM KOA → KOA Jul 13, 02:10 UTCJul 13, 02:20 UTC10m
2026-07-13 N405CM KOA → KOA Jul 13, 01:55 UTCJul 13, 02:01 UTC5m
2026-07-13 N405CM KOA → KOA Jul 13, 01:35 UTCJul 13, 01:40 UTC5m
2026-07-12 N405CM KOA → KOA Jul 12, 22:25 UTCJul 12, 22:35 UTC10m
2026-07-12 N405CM KOA → KOA Jul 12, 21:55 UTCJul 12, 22:15 UTC20m
2026-07-11 N405CM KOA → KOA Jul 11, 23:30 UTCJul 12, 00:05 UTC35m
2026-07-11 N405CM - Jul 11, 18:55 UTCJul 11, 19:20 UTC25m
2026-07-11 N405CM - Jul 11, 18:10 UTCJul 11, 18:20 UTC10m
2026-07-10 N405CM KOA → KOA Jul 10, 23:40 UTCJul 11, 00:10 UTC30m
2026-07-10 N405CM KOA → KOA Jul 10, 19:50 UTCJul 10, 20:40 UTC50m
2026-07-09 N405CM - Jul 9, 21:25 UTCJul 9, 21:30 UTC5m
2026-07-09 N405CM - Jul 9, 19:40 UTCJul 9, 19:50 UTC10m
2026-07-09 N405CM - Jul 9, 03:05 UTCJul 9, 03:15 UTC10m
2026-07-09 N405CM - Jul 9, 02:05 UTCJul 9, 02:15 UTC10m
2026-07-08 N405CM KOA → KOA Jul 8, 21:45 UTCJul 8, 22:40 UTC55m
2026-07-08 N405CM KOA → KOA Jul 8, 18:15 UTCJul 8, 18:20 UTC5m
2026-07-08 N405CM KOA → KOA Jul 8, 18:05 UTCJul 8, 18:10 UTC5m
2026-07-08 N405CM KOA → KOA Jul 8, 02:40 UTCJul 8, 02:45 UTC5m
2026-07-08 N405CM KOA → KOA Jul 8, 02:05 UTCJul 8, 02:35 UTC30m
2026-07-08 N405CM KOA → KOA Jul 8, 01:45 UTCJul 8, 01:50 UTC5m
2026-07-08 N405CM KOA → KOA Jul 8, 00:20 UTCJul 8, 00:35 UTC15m
2026-07-07 N405CM KOA → KOA Jul 7, 23:45 UTCJul 8, 00:05 UTC20m
2026-07-06 N405CM - Jul 6, 01:40 UTCJul 6, 01:50 UTC10m
2026-07-06 N405CM - Jul 6, 00:20 UTCJul 6, 00:30 UTC10m
2026-07-05 N405CM - Jul 5, 21:20 UTCJul 5, 21:35 UTC15m
2026-07-05 N405CM - Jul 5, 20:10 UTCJul 5, 20:20 UTC10m
2026-07-04 N405CM - Jul 4, 06:00 UTCJul 4, 06:05 UTC5m
2026-07-04 N405CM - Jul 4, 04:40 UTCJul 4, 04:55 UTC15m
2026-07-03 N405CM - Jul 3, 01:05 UTCJul 3, 01:10 UTC5m
2026-07-03 N405CM - Jul 3, 00:10 UTCJul 3, 00:20 UTC10m
2026-07-02 N405CM KOA → KOA Jul 2, 21:25 UTCJul 2, 22:25 UTC1h 0m
2026-07-02 N405CM KOA → KOA Jul 2, 17:25 UTCJul 2, 18:25 UTC1h 0m
2026-07-02 N405CM KOA → KOA Jul 2, 00:15 UTCJul 2, 00:20 UTC5m
2026-07-01 N405CM KOA → KOA Jul 1, 23:45 UTCJul 1, 23:50 UTC5m
2026-07-01 N405CM - Jul 1, 18:15 UTCJul 1, 18:25 UTC10m
2026-07-01 N405CM - Jul 1, 17:20 UTCJul 1, 17:30 UTC10m
2026-06-30 N405CM KOA → KOA Jun 30, 04:45 UTCJun 30, 05:00 UTC15m
2026-06-30 N405CM KOA → KOA Jun 30, 04:15 UTCJun 30, 04:40 UTC25m
2026-06-28 N405CM KOA → KOA Jun 28, 17:39 UTCJun 28, 18:19 UTC40m
2026-06-26 N405CM KOA → KOA Jun 26, 22:49 UTCJun 26, 23:49 UTC1h 0m
2026-06-26 N405CM KOA → KOA Jun 26, 17:50 UTCJun 26, 19:04 UTC1h 15m
2026-06-26 N405CM KOA → KOA Jun 26, 01:29 UTCJun 26, 01:50 UTC20m

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 N405CM page for operator, model, and routing details .

Mode-S A4BF72 frequently asked

What is Mode-S code A4BF72?
A4BF72 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405CM.
Where is Mode-S A4BF72 registered?
Mode-S code A4BF72 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 A4BF72 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BF72, octal 51137562, decimal 10,796,914.
What flights does A4BF72 operate?
Mode-S A4BF72 has broadcast 1 distinct callsign, including N405CM.