Apparatus

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sensors Mode-S transponder

A0665B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N125AX · BEECH 1900 · operated by ALASKA CENTRAL EXPRESS INC

Hex
A0665B
Octal
50063133
Decimal
10,511,963
Country
US
Tail
N125AX
Type
B190
No current signal · last broadcast 6d ago
Flights observed
132
Distinct callsigns
20
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A0665B.

Country allocation

The ICAO 24-bit address A0665B 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 20 distinct

Callsign Airline Flights Last seen
AER41 Alaska Central Express 23 2026-04-17
AER31 Alaska Central Express 19 2026-05-23
AER42 Alaska Central Express 12 2026-05-13
AER65 Alaska Central Express 11 2026-05-07
AER66 Alaska Central Express 9 2026-04-20
AER145 Alaska Central Express 8 2026-04-30
AER52 Alaska Central Express 7 2026-05-18
AER146 Alaska Central Express 7 2026-05-13
AERT5 - 6 2026-05-04
AER43 Alaska Central Express 6 2026-04-20
AER53 Alaska Central Express 4 2026-05-11
AER21 Alaska Central Express 4 2026-05-14
AER32 Alaska Central Express 3 2026-05-18
AERT8 - 2 2026-04-28
AER99 - 2 2026-04-23
AER711 Alaska Central Express 2 2026-04-29
AER67 Alaska Central Express 2 2026-04-25
AER55 Alaska Central Express 2 2026-04-18
AER35 Alaska Central Express 2 2026-04-24
AER64 - 1 2026-04-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-23 AER31 AKN → ANC May 23, 18:40 UTCMay 23, 18:45 UTC5m
2026-05-19 AER31 AKN → ANC May 19, 15:30 UTCMay 19, 17:30 UTC2h 0m
2026-05-19 AER31 AKN → ANC May 19, 13:35 UTCMay 19, 14:50 UTC1h 15m
2026-05-18 AER32 ILI → ANC May 18, 23:15 UTCMay 19, 00:00 UTC45m
2026-05-18 AER32 ILI → ANC May 18, 22:05 UTCMay 18, 22:30 UTC25m
2026-05-18 AER32 ILI → ANC May 18, 20:15 UTCMay 18, 21:35 UTC1h 20m
2026-05-18 AER52 ANC → DLG May 18, 17:00 UTCMay 18, 18:00 UTC1h 0m
2026-05-18 AER52 ANC → DLG May 18, 16:10 UTCMay 18, 16:30 UTC20m
2026-05-18 AER52 ANC → DLG May 18, 13:55 UTCMay 18, 15:20 UTC1h 25m
2026-05-16 AER31 AKN → ANC May 16, 15:16 UTCMay 16, 16:20 UTC1h 5m
2026-05-16 AER31 AKN → ANC May 16, 13:31 UTCMay 16, 14:46 UTC1h 15m
2026-05-15 AER31 AKN → ANC May 15, 15:10 UTCMay 15, 16:45 UTC1h 35m
2026-05-15 AER31 AKN → ANC May 15, 13:35 UTCMay 15, 14:35 UTC1h 0m
2026-05-14 AER31 AKN → ANC May 14, 16:35 UTCMay 14, 17:45 UTC1h 10m
2026-05-14 AER31 AKN → ANC May 14, 14:50 UTCMay 14, 16:00 UTC1h 10m
2026-05-14 AER21 ANC → PSG May 14, 02:05 UTCMay 14, 03:00 UTC55m
2026-05-14 AER21 ANC → PSG May 14, 00:35 UTCMay 14, 01:20 UTC45m
2026-05-13 AER21 ANC → PSG May 13, 23:05 UTCMay 13, 23:35 UTC30m
2026-05-13 AER21 ANC → PSG May 13, 20:50 UTCMay 13, 22:15 UTC1h 25m
2026-05-13 AER42 ANC → YAK May 13, 17:20 UTCMay 13, 18:00 UTC40m
2026-05-13 AER42 ANC → YAK May 13, 16:05 UTCMay 13, 16:25 UTC20m
2026-05-13 AER42 ANC → YAK May 13, 13:31 UTCMay 13, 14:40 UTC1h 10m
2026-05-13 AER146 ANC → ILI May 13, 03:35 UTCMay 13, 04:30 UTC55m
2026-05-13 AER146 ANC → ILI May 13, 02:00 UTCMay 13, 03:05 UTC1h 5m
2026-05-12 AER31 AKN → ANC May 12, 15:20 UTCMay 12, 16:25 UTC1h 5m
2026-05-12 AER31 AKN → ANC May 12, 13:30 UTCMay 12, 14:40 UTC1h 10m
2026-05-11 AER53 ANC → DLG May 11, 21:05 UTCMay 11, 22:35 UTC1h 29m
2026-05-11 AER53 ANC → DLG May 11, 18:55 UTCMay 11, 20:20 UTC1h 25m
2026-05-11 AER31 AKN → ANC May 11, 15:30 UTCMay 11, 16:30 UTC1h 0m
2026-05-11 AER31 AKN → ANC May 11, 13:25 UTCMay 11, 14:50 UTC1h 25m
2026-05-09 AER31 AKN → ANC May 9, 15:30 UTCMay 9, 16:30 UTC1h 0m
2026-05-09 AER31 AKN → ANC May 9, 13:45 UTCMay 9, 14:55 UTC1h 10m
2026-05-08 AER42 ANC → YAK May 8, 16:15 UTCMay 8, 16:55 UTC40m
2026-05-08 AER42 ANC → YAK May 8, 15:10 UTCMay 8, 15:30 UTC20m
2026-05-08 AER42 ANC → YAK May 8, 12:44 UTCMay 8, 13:50 UTC1h 5m
2026-05-07 AER65 ANC → SDP May 7, 23:34 UTCMay 8, 01:19 UTC1h 45m
2026-05-07 AER65 ANC → SDP May 7, 16:35 UTCMay 7, 18:20 UTC1h 45m
2026-05-06 AER53 ANC → DLG May 6, 19:45 UTCMay 6, 20:55 UTC1h 10m
2026-05-06 AER53 ANC → DLG May 6, 17:40 UTCMay 6, 19:00 UTC1h 20m
2026-05-06 AER31 AKN → ANC May 6, 15:00 UTCMay 6, 16:05 UTC1h 5m
2026-05-06 AER31 AKN → ANC May 6, 13:20 UTCMay 6, 14:25 UTC1h 5m
2026-05-05 AER52 ANC → DLG May 5, 16:06 UTCMay 5, 17:15 UTC1h 10m
2026-05-05 AER52 ANC → DLG May 5, 14:05 UTCMay 5, 15:20 UTC1h 15m
2026-05-04 AER65 ANC → SDP May 4, 22:40 UTCMay 5, 00:30 UTC1h 50m
2026-05-04 AER65 ANC → SDP May 4, 16:25 UTCMay 4, 18:15 UTC1h 50m
2026-05-04 AERT5 - May 4, 00:15 UTCMay 4, 01:15 UTC1h 0m
2026-05-03 AERT5 ANC → ENA May 3, 23:04 UTCMay 4, 00:05 UTC1h 0m
2026-05-02 AER65 ANC → SDP May 2, 22:30 UTCMay 2, 23:55 UTC1h 25m
2026-05-02 AER65 ANC → SDP May 2, 16:00 UTCMay 2, 18:05 UTC2h 5m
2026-05-01 AER52 ANC → DLG May 1, 19:20 UTCMay 1, 20:30 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 N125AX page for operator, model, and routing details .

Mode-S A0665B frequently asked

What is Mode-S code A0665B?
A0665B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N125AX.
Where is Mode-S A0665B registered?
Mode-S code A0665B 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 A0665B broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0665B, octal 50063133, decimal 10,511,963.
What flights does A0665B operate?
Mode-S A0665B has broadcast 20 distinct callsigns, including AER41, AER31, AER42, AER65, AER66.