Apparatus

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sensors Mode-S transponder

A23EF1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N244AX · BEECH 1900 · operated by TAILWIND INVESTMENTS LLC

Hex
A23EF1
Octal
50437361
Decimal
10,632,945
Country
US
Tail
N244AX
Type
B190
No current signal · last broadcast 1d ago
Flights observed
146
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A23EF1.

Country allocation

The ICAO 24-bit address A23EF1 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
AER901 - 25 2026-06-16
AER910 - 21 2026-07-15
AER121 Alaska Central Express 19 2026-06-17
AER970 Alaska Central Express 8 2026-06-11
AER930 - 8 2026-07-14
AER101 - 8 2026-06-16
AER913 Alaska Central Express 6 2026-06-04
AER912 Alaska Central Express 6 2026-06-12
AER902 Alaska Central Express 6 2026-06-05
AER981 - 4 2026-07-10
AER920 - 4 2026-07-01
AER180 - 4 2026-07-17
AERT8 - 2 2026-06-16
AERT5 - 2 2026-05-26
AER999 - 2 2026-06-18
AER99 - 2 2026-06-25
AER985 - 2 2026-06-28
AER971 - 2 2026-07-02
AER956 - 2 2026-06-27
AER955 - 2 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 AER180 HOM → ANC Jul 17, 02:05 UTCJul 17, 02:50 UTC45m
2026-07-17 AER180 - Jul 17, 01:00 UTCJul 17, 01:49 UTC50m
2026-07-16 AER180 - Jul 16, 23:35 UTCJul 17, 00:30 UTC55m
2026-07-16 AER180 - Jul 16, 22:15 UTCJul 16, 22:59 UTC45m
2026-07-16 AER955 - Jul 16, 19:45 UTCJul 16, 20:49 UTC1h 5m
2026-07-16 AER955 - Jul 16, 17:40 UTCJul 16, 19:10 UTC1h 30m
2026-07-15 AER910 - Jul 15, 05:55 UTCJul 15, 07:25 UTC1h 30m
2026-07-15 AER910 - Jul 15, 01:10 UTCJul 15, 03:05 UTC1h 55m
2026-07-14 AER930 AKN → ANC Jul 14, 21:45 UTCJul 14, 22:50 UTC1h 4m
2026-07-14 AER930 - Jul 14, 19:40 UTCJul 14, 21:00 UTC1h 20m
2026-07-11 AER925 - Jul 11, 23:55 UTCJul 12, 00:55 UTC1h 0m
2026-07-11 AER925 - Jul 11, 22:01 UTCJul 11, 23:20 UTC1h 20m
2026-07-10 AER981 - Jul 10, 20:10 UTCJul 10, 21:20 UTC1h 10m
2026-07-10 AER981 - Jul 10, 18:10 UTCJul 10, 19:15 UTC1h 5m
2026-07-09 AER930 - Jul 9, 22:05 UTCJul 9, 23:15 UTC1h 10m
2026-07-09 AER930 - Jul 9, 19:25 UTCJul 9, 20:30 UTC1h 5m
2026-07-08 AER930 AKN → ANC Jul 8, 22:20 UTCJul 8, 23:45 UTC1h 25m
2026-07-08 AER930 - Jul 8, 19:30 UTCJul 8, 20:35 UTC1h 5m
2026-07-08 AER170 - Jul 8, 00:15 UTCJul 8, 00:50 UTC35m
2026-07-07 AER170 - Jul 7, 23:20 UTCJul 7, 23:55 UTC35m
2026-07-06 AER31 - Jul 6, 18:15 UTCJul 6, 19:25 UTC1h 10m
2026-07-06 AER31 ANC → AKN Jul 6, 16:40 UTCJul 6, 17:45 UTC1h 5m
2026-07-04 AER910 - Jul 4, 03:00 UTCJul 4, 04:25 UTC1h 25m
2026-07-03 AER910 - Jul 3, 21:50 UTCJul 3, 23:35 UTC1h 45m
2026-07-03 AER907 - Jul 3, 20:00 UTCJul 3, 21:10 UTC1h 10m
2026-07-03 AER907 - Jul 3, 17:55 UTCJul 3, 19:05 UTC1h 10m
2026-07-02 AER971 - Jul 2, 19:35 UTCJul 2, 21:05 UTC1h 30m
2026-07-02 AER971 - Jul 2, 16:05 UTCJul 2, 17:50 UTC1h 45m
2026-07-01 AER920 - Jul 1, 17:15 UTCJul 1, 18:25 UTC1h 10m
2026-07-01 AER920 - Jul 1, 15:05 UTCJul 1, 16:30 UTC1h 25m
2026-06-30 AER981 - Jun 30, 20:10 UTCJun 30, 21:20 UTC1h 10m
2026-06-30 AER981 - Jun 30, 18:25 UTCJun 30, 19:30 UTC1h 5m
2026-06-29 AER930 - Jun 29, 21:44 UTCJun 29, 22:44 UTC1h 0m
2026-06-29 AER930 - Jun 29, 19:24 UTCJun 29, 20:35 UTC1h 10m
2026-06-28 AER985 - Jun 28, 20:45 UTCJun 28, 21:55 UTC1h 10m
2026-06-28 AER985 - Jun 28, 18:55 UTCJun 28, 20:14 UTC1h 20m
2026-06-27 AER956 - Jun 27, 19:09 UTCJun 27, 20:19 UTC1h 10m
2026-06-27 AER956 - Jun 27, 17:14 UTCJun 27, 18:29 UTC1h 15m
2026-06-26 AER920 - Jun 26, 18:09 UTCJun 26, 19:20 UTC1h 10m
2026-06-26 AER920 - Jun 26, 15:25 UTCJun 26, 16:44 UTC1h 20m
2026-06-25 AER81 ANC → ANC Jun 25, 19:24 UTCJun 25, 20:25 UTC1h 0m
2026-06-25 AER99 ANC → ANC Jun 25, 08:30 UTCJun 25, 08:45 UTC15m
2026-06-18 AER999 FAI → ANC Jun 18, 04:10 UTCJun 18, 05:15 UTC1h 5m
2026-06-18 AER999 FAI → FAI Jun 18, 02:35 UTCJun 18, 02:55 UTC20m
2026-06-17 AER121 FAI → ANC Jun 17, 17:40 UTCJun 17, 18:10 UTC30m
2026-06-17 AER121 FAI → ANC Jun 17, 16:20 UTCJun 17, 17:20 UTC1h 0m
2026-06-16 AERT8 ANC → ANC Jun 16, 21:00 UTCJun 16, 22:05 UTC1h 5m
2026-06-16 AER101 - Jun 16, 17:59 UTCJun 16, 19:05 UTC1h 5m
2026-06-16 AER101 - Jun 16, 17:24 UTCJun 16, 17:45 UTC20m
2026-06-16 AER101 - Jun 16, 16:15 UTCJun 16, 16:39 UTC25m

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 N244AX page for operator, model, and routing details .

Mode-S A23EF1 frequently asked

What is Mode-S code A23EF1?
A23EF1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N244AX.
Where is Mode-S A23EF1 registered?
Mode-S code A23EF1 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 A23EF1 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23EF1, octal 50437361, decimal 10,632,945.
What flights does A23EF1 operate?
Mode-S A23EF1 has broadcast 20 distinct callsigns, including AER901, AER910, AER121, AER970, AER930.