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 Jul 26, 22:45 UTC
Flights observed
287
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

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 - 42 2026-06-29
AER66 - 24 2026-07-13
AER43 - 22 2026-07-17
AER31 Alaska Central Express 22 2026-07-23
AER65 - 19 2026-07-10
AER42 - 15 2026-06-27
AER145 - 14 2026-07-18
AER67 - 10 2026-07-10
AER52 - 9 2026-07-13
AERT8 - 8 2026-07-12
AER53 - 8 2026-07-13
AER21 - 8 2026-07-18
AER146 Alaska Central Express 7 2026-05-13
AERT5 - 6 2026-05-04
AER970 Alaska Central Express 6 2026-07-25
AER920 - 6 2026-07-24
AER32 - 5 2026-06-24
AER930 Alaska Central Express 4 2026-07-19
AER69 - 4 2026-06-30
AER46 - 4 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AER180 ANC → HOM Jul 26, 21:35 UTCJul 26, 22:05 UTC30m
2026-07-25 AER970 BRW → ANC Jul 25, 22:50 UTCJul 26, 00:00 UTC1h 10m
2026-07-25 AER970 BRW → ANC Jul 25, 21:10 UTCJul 25, 22:25 UTC1h 15m
2026-07-25 AER925 - Jul 25, 19:20 UTCJul 25, 20:20 UTC1h 0m
2026-07-25 AER925 - Jul 25, 18:00 UTCJul 25, 19:00 UTC1h 0m
2026-07-25 AER973 ANC → CDB Jul 25, 02:45 UTCJul 25, 03:55 UTC1h 10m
2026-07-25 AER973 ANC → CDB Jul 25, 01:35 UTCJul 25, 02:20 UTC45m
2026-07-25 AER180 ANC → HOM Jul 25, 00:15 UTCJul 25, 01:05 UTC50m
2026-07-24 AER180 ANC → HOM Jul 24, 22:45 UTCJul 24, 23:30 UTC45m
2026-07-24 AER180 ANC → HOM Jul 24, 21:50 UTCJul 24, 22:15 UTC25m
2026-07-24 AER920 - Jul 24, 17:05 UTCJul 24, 18:20 UTC1h 15m
2026-07-24 AER920 - Jul 24, 15:05 UTCJul 24, 16:30 UTC1h 25m
2026-07-24 AER977 ANC → AKN Jul 24, 04:20 UTCJul 24, 05:35 UTC1h 15m
2026-07-24 AER977 ANC → AKN Jul 24, 02:55 UTCJul 24, 04:00 UTC1h 5m
2026-07-24 AER975 ANC → AKN Jul 24, 00:55 UTCJul 24, 02:10 UTC1h 15m
2026-07-23 AER975 ANC → AKN Jul 23, 23:10 UTCJul 24, 00:20 UTC1h 10m
2026-07-23 AER973 ANC → CDB Jul 23, 21:05 UTCJul 23, 22:20 UTC1h 15m
2026-07-23 AER31 AKN → ANC Jul 23, 19:15 UTCJul 23, 20:30 UTC1h 15m
2026-07-23 AER971 ANC → CDB Jul 23, 16:35 UTCJul 23, 17:35 UTC1h 0m
2026-07-23 AER971 ANC → CDB Jul 23, 14:25 UTCJul 23, 15:55 UTC1h 30m
2026-07-23 AER974 ANC → AKN Jul 23, 05:55 UTCJul 23, 07:05 UTC1h 10m
2026-07-23 AER974 ANC → AKN Jul 23, 04:10 UTCJul 23, 05:30 UTC1h 20m
2026-07-23 AER122 - Jul 23, 02:05 UTCJul 23, 03:20 UTC1h 15m
2026-07-23 AER122 - Jul 23, 01:05 UTCJul 23, 01:30 UTC25m
2026-07-22 AER122 - Jul 22, 23:10 UTCJul 22, 23:35 UTC25m
2026-07-22 AER122 - Jul 22, 21:55 UTCJul 22, 22:55 UTC1h 0m
2026-07-22 AER121 - Jul 22, 16:40 UTCJul 22, 17:30 UTC50m
2026-07-22 AER976 ANC → AKN Jul 22, 04:05 UTCJul 22, 05:05 UTC1h 0m
2026-07-22 AER976 ANC → AKN Jul 22, 02:35 UTCJul 22, 03:50 UTC1h 15m
2026-07-22 AER972 ANC → CDB Jul 22, 00:55 UTCJul 22, 02:00 UTC1h 5m
2026-07-21 AER972 ANC → CDB Jul 21, 23:00 UTCJul 22, 00:20 UTC1h 20m
2026-07-21 AER970 AKN → ANC Jul 21, 19:35 UTCJul 21, 20:45 UTC1h 10m
2026-07-21 AER970 ANC → AKN Jul 21, 17:45 UTCJul 21, 19:00 UTC1h 15m
2026-07-19 AER930 ANC → AKN Jul 19, 21:50 UTCJul 19, 22:50 UTC1h 0m
2026-07-19 AER930 ANC → AKN Jul 19, 19:30 UTCJul 19, 20:50 UTC1h 20m
2026-07-18 AER930 ANC → AKN Jul 18, 22:05 UTCJul 18, 23:05 UTC1h 0m
2026-07-18 AER930 ANC → AKN Jul 18, 19:45 UTCJul 18, 21:05 UTC1h 20m
2026-07-18 AER145 - Jul 18, 14:40 UTCJul 18, 15:35 UTC55m
2026-07-18 AER145 ANC → ADQ Jul 18, 12:35 UTCJul 18, 13:50 UTC1h 15m
2026-07-18 AER21 - Jul 18, 01:30 UTCJul 18, 04:05 UTC2h 36m
2026-07-17 AER21 - Jul 17, 22:10 UTCJul 18, 00:39 UTC2h 30m
2026-07-17 AER43 - Jul 17, 17:50 UTCJul 17, 19:55 UTC2h 5m
2026-07-17 AER43 - Jul 17, 16:00 UTCJul 17, 16:59 UTC1h 0m
2026-07-17 AER43 - Jul 17, 11:15 UTCJul 17, 14:04 UTC2h 50m
2026-07-17 AER21 - Jul 17, 02:30 UTCJul 17, 04:44 UTC2h 15m
2026-07-16 AER21 - Jul 16, 22:05 UTCJul 17, 01:20 UTC3h 15m
2026-07-13 AER53 - Jul 13, 22:15 UTCJul 13, 23:30 UTC1h 15m
2026-07-13 AER53 - Jul 13, 20:00 UTCJul 13, 21:20 UTC1h 20m
2026-07-13 AER52 - Jul 13, 16:45 UTCJul 13, 17:55 UTC1h 10m
2026-07-13 AER52 - Jul 13, 14:25 UTCJul 13, 15:50 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 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 Jul 26, 22:45 UTC.
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, AER66, AER43, AER31, AER65.