Apparatus

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sensors Mode-S transponder

A04A01

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N118AX · BEECH 1900 · operated by ALASKA CENTRAL EXPRESS INC

Hex
A04A01
Octal
50045001
Decimal
10,504,705
Country
US
Tail
N118AX
Type
B190
No current signal · last broadcast 16d ago
Flights observed
112
Distinct callsigns
20
Country
US
Last broadcast
16d ago

Last known position

Most recent position reported by Mode-S A04A01.

Country allocation

The ICAO 24-bit address A04A01 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
AER42 Alaska Central Express 13 2026-07-22
AER145 Alaska Central Express 11 2026-07-20
AER52 - 9 2026-07-23
AER930 Alaska Central Express 8 2026-07-25
AER21 - 7 2026-07-09
AER53 - 6 2026-07-10
AER65 Alaska Central Express 5 2026-07-02
AER41 - 5 2026-07-07
AER973 Alaska Central Express 4 2026-07-26
AER970 Alaska Central Express 4 2026-07-24
AER43 Alaska Central Express 4 2026-07-03
AER36 - 4 2026-07-01
AER907 Alaska Central Express 3 2026-07-24
AER54 Alaska Central Express 3 2026-07-17
AERT10 - 2 2026-07-04
AER974 Alaska Central Express 2 2026-07-22
AER971 Alaska Central Express 2 2026-07-19
AER926 - 2 2026-07-04
AER920 - 2 2026-07-19
AER68 - 2 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AER931 ANC → AKN Jul 26, 20:15 UTCJul 26, 21:20 UTC1h 5m
2026-07-26 AER973 ANC → CDB Jul 26, 00:55 UTCJul 26, 01:55 UTC1h 0m
2026-07-25 AER973 ANC → CDB Jul 25, 23:30 UTCJul 26, 00:35 UTC1h 5m
2026-07-25 AER930 ANC → AKN Jul 25, 21:55 UTCJul 25, 23:00 UTC1h 5m
2026-07-25 AER930 ANC → AKN Jul 25, 19:30 UTCJul 25, 20:40 UTC1h 10m
2026-07-24 AER970 BRW → ANC Jul 24, 23:35 UTCJul 25, 00:45 UTC1h 10m
2026-07-24 AER970 BRW → ANC Jul 24, 22:05 UTCJul 24, 23:10 UTC1h 5m
2026-07-24 AER907 ANC → DLG Jul 24, 18:20 UTCJul 24, 21:15 UTC2h 55m
2026-07-24 AER146 ANC → ILI Jul 24, 01:05 UTCJul 24, 02:20 UTC1h 15m
2026-07-23 AER146 ANC → ILI Jul 23, 23:15 UTCJul 24, 00:20 UTC1h 5m
2026-07-23 AER52 - Jul 23, 16:50 UTCJul 23, 17:50 UTC1h 0m
2026-07-23 AER52 - Jul 23, 14:20 UTCJul 23, 15:55 UTC1h 35m
2026-07-23 AER973 ANC → CDB Jul 23, 02:20 UTCJul 23, 03:35 UTC1h 15m
2026-07-23 AER973 ANC → CDB Jul 23, 00:15 UTCJul 23, 01:40 UTC1h 25m
2026-07-22 AER970 BRW → ANC Jul 22, 22:30 UTCJul 22, 23:25 UTC55m
2026-07-22 AER970 BRW → ANC Jul 22, 20:20 UTCJul 22, 21:45 UTC1h 25m
2026-07-22 AER42 ANC → YAK Jul 22, 15:35 UTCJul 22, 16:25 UTC50m
2026-07-22 AER42 ANC → YAK Jul 22, 14:15 UTCJul 22, 15:15 UTC1h 0m
2026-07-22 AER42 ANC → YAK Jul 22, 12:20 UTCJul 22, 13:35 UTC1h 15m
2026-07-22 AER974 ANC → AKN Jul 22, 01:50 UTCJul 22, 03:00 UTC1h 10m
2026-07-21 AER974 ANC → AKN Jul 21, 23:55 UTCJul 22, 01:20 UTC1h 25m
2026-07-21 AER930 ANC → AKN Jul 21, 21:45 UTCJul 21, 22:55 UTC1h 10m
2026-07-21 AER930 ANC → AKN Jul 21, 19:30 UTCJul 21, 20:55 UTC1h 25m
2026-07-20 AER930 ANC → AKN Jul 20, 21:50 UTCJul 20, 23:05 UTC1h 15m
2026-07-20 AER930 ANC → AKN Jul 20, 19:35 UTCJul 20, 20:50 UTC1h 15m
2026-07-20 AER145 ANC → ADQ Jul 20, 12:45 UTCJul 20, 15:25 UTC2h 40m
2026-07-19 AER920 - Jul 19, 18:40 UTCJul 19, 19:50 UTC1h 10m
2026-07-19 AER920 - Jul 19, 15:15 UTCJul 19, 16:40 UTC1h 25m
2026-07-19 AER971 ANC → CDB Jul 19, 01:15 UTCJul 19, 02:15 UTC1h 0m
2026-07-18 AER971 ANC → CDB Jul 18, 23:30 UTCJul 19, 00:45 UTC1h 15m
2026-07-18 AER907 ANC → DLG Jul 18, 20:15 UTCJul 18, 21:20 UTC1h 5m
2026-07-18 AER907 ANC → DLG Jul 18, 18:05 UTCJul 18, 19:25 UTC1h 20m
2026-07-17 AER54 ANC → DLG Jul 17, 23:50 UTCJul 18, 00:29 UTC40m
2026-07-17 AER54 ANC → DLG Jul 17, 22:15 UTCJul 17, 22:55 UTC40m
2026-07-17 AER54 ANC → DLG Jul 17, 20:25 UTCJul 17, 21:44 UTC1h 20m
2026-07-17 AER52 - Jul 17, 17:15 UTCJul 17, 18:15 UTC1h 0m
2026-07-17 AER52 - Jul 17, 16:15 UTCJul 17, 16:34 UTC20m
2026-07-17 AER52 - Jul 17, 14:20 UTCJul 17, 15:44 UTC1h 25m
2026-07-16 AER52 - Jul 16, 16:09 UTCJul 16, 17:14 UTC1h 5m
2026-07-16 AER52 - Jul 16, 14:05 UTCJul 16, 15:30 UTC1h 25m
2026-07-16 AER81 ANC → ANC Jul 16, 02:05 UTCJul 16, 03:50 UTC1h 45m
2026-07-16 AER52 - Jul 16, 00:05 UTCJul 16, 01:15 UTC1h 10m
2026-07-15 AER52 - Jul 15, 21:55 UTCJul 15, 23:15 UTC1h 20m
2026-07-10 AER53 - Jul 10, 23:10 UTCJul 10, 23:50 UTC40m
2026-07-10 AER53 - Jul 10, 22:05 UTCJul 10, 22:35 UTC30m
2026-07-10 AER53 - Jul 10, 20:05 UTCJul 10, 21:20 UTC1h 15m
2026-07-10 AER145 ADQ → ANC Jul 10, 14:30 UTCJul 10, 15:30 UTC1h 0m
2026-07-10 AER145 ANC → ADQ Jul 10, 12:50 UTCJul 10, 13:50 UTC1h 0m
2026-07-09 AER21 - Jul 9, 21:05 UTCJul 9, 23:25 UTC2h 20m
2026-07-09 AER21 - Jul 9, 17:40 UTCJul 9, 20:15 UTC2h 35m

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 N118AX page for operator, model, and routing details .

Mode-S A04A01 frequently asked

What is Mode-S code A04A01?
A04A01 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N118AX.
Where is Mode-S A04A01 registered?
Mode-S code A04A01 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 A04A01 broadcasting right now?
No active broadcast right now. Last signal was 16d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A04A01, octal 50045001, decimal 10,504,705.
What flights does A04A01 operate?
Mode-S A04A01 has broadcast 20 distinct callsigns, including AER42, AER145, AER52, AER930, AER21.