Apparatus

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sensors Mode-S transponder

A1A546

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N205HA · AIRBUS A-321neo · operated by HAWAIIAN AIRLINES INC

Hex
A1A546
Octal
50322506
Decimal
10,593,606
Country
US
Tail
N205HA
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
268
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A1A546.

Country allocation

The ICAO 24-bit address A1A546 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
ASA888 Alaska Airlines 12 2026-05-30
ASA878 Alaska Airlines 10 2026-05-22
ASA953 - 9 2026-07-12
ASA966 - 8 2026-07-05
ASA964 - 8 2026-06-19
ASA954 - 8 2026-07-12
ASA904 Alaska Airlines 8 2026-06-03
ASA870 - 8 2026-07-01
ASA965 - 7 2026-07-05
ASA941 Alaska Airlines 7 2026-06-01
ASA862 Alaska Airlines 7 2026-06-01
ASA861 Alaska Airlines 7 2026-06-03
ASA825 - 7 2026-07-04
ASA968 - 6 2026-06-23
ASA960 - 6 2026-07-14
ASA959 - 6 2026-07-14
ASA880 - 6 2026-06-30
ASA879 Alaska Airlines 6 2026-06-30
ASA847 Alaska Airlines 6 2026-05-29
ASA971 - 5 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA959 - Jul 14, 15:55 UTCJul 14, 16:35 UTC40m
2026-07-14 ASA960 - Jul 14, 01:20 UTCJul 14, 02:05 UTC45m
2026-07-13 ASA931 - Jul 13, 14:25 UTCJul 13, 15:30 UTC1h 5m
2026-07-13 ASA932 - Jul 13, 01:01 UTCJul 13, 02:05 UTC1h 5m
2026-07-12 ASA953 - Jul 12, 14:10 UTCJul 12, 14:50 UTC40m
2026-07-12 ASA954 - Jul 12, 02:15 UTCJul 12, 02:55 UTC40m
2026-07-11 ASA971 - Jul 11, 15:20 UTCJul 11, 15:55 UTC35m
2026-07-11 ASA972 - Jul 11, 02:40 UTCJul 11, 03:10 UTC30m
2026-07-10 ASA959 - Jul 10, 15:45 UTCJul 10, 16:30 UTC45m
2026-07-10 ASA960 - Jul 10, 01:20 UTCJul 10, 02:15 UTC55m
2026-07-09 ASA931 - Jul 9, 14:30 UTCJul 9, 15:25 UTC55m
2026-07-09 ASA932 - Jul 9, 00:50 UTCJul 9, 02:00 UTC1h 10m
2026-07-08 ASA953 - Jul 8, 14:15 UTCJul 8, 14:55 UTC40m
2026-07-08 ASA954 - Jul 8, 02:25 UTCJul 8, 03:00 UTC35m
2026-07-07 ASA971 - Jul 7, 15:35 UTCJul 7, 16:10 UTC35m
2026-07-07 ASA972 - Jul 7, 02:40 UTCJul 7, 03:15 UTC35m
2026-07-06 ASA959 - Jul 6, 15:45 UTCJul 6, 16:40 UTC55m
2026-07-05 ASA966 - Jul 5, 21:05 UTCJul 6, 01:40 UTC4h 35m
2026-07-05 ASA965 - Jul 5, 14:05 UTCJul 5, 14:45 UTC40m
2026-07-05 ASA966 - Jul 5, 03:20 UTCJul 5, 04:00 UTC40m
2026-07-04 ASA966 - Jul 4, 23:10 UTCJul 4, 23:30 UTC20m
2026-07-04 ASA825 - Jul 4, 21:55 UTCJul 4, 22:05 UTC10m
2026-07-04 ASA825 - Jul 4, 16:50 UTCJul 4, 17:20 UTC30m
2026-07-04 ASA845 SEA → GEG Jul 4, 04:25 UTCJul 4, 05:05 UTC40m
2026-07-03 ASA844 - Jul 3, 17:10 UTCJul 3, 17:40 UTC30m
2026-07-03 ASA853 - Jul 3, 14:30 UTCJul 3, 15:10 UTC40m
2026-07-03 ASA853 - Jul 3, 10:15 UTCJul 3, 10:30 UTC15m
2026-07-02 ASA869 - Jul 2, 19:25 UTCJul 2, 19:50 UTC25m
2026-07-02 ASA869 - Jul 2, 14:20 UTCJul 2, 14:55 UTC35m
2026-07-02 ASA972 - Jul 2, 02:20 UTCJul 2, 02:55 UTC35m
2026-07-01 ASA971 - Jul 1, 15:20 UTCJul 1, 15:55 UTC35m
2026-07-01 ASA870 - Jul 1, 03:00 UTCJul 1, 03:30 UTC30m
2026-06-30 ASA870 - Jun 30, 22:45 UTCJun 30, 23:05 UTC20m
2026-06-30 ASA879 SFO → OGG Jun 30, 20:30 UTCJun 30, 20:40 UTC10m
2026-06-30 ASA879 SFO → OGG Jun 30, 15:25 UTCJun 30, 16:10 UTC45m
2026-06-30 ASA880 - Jun 30, 12:20 UTCJun 30, 13:10 UTC50m
2026-06-30 ASA880 - Jun 30, 08:10 UTCJun 30, 08:20 UTC10m
2026-06-30 ASA894 KOA → SAN Jun 30, 00:49 UTCJun 30, 06:20 UTC5h 30m
2026-06-29 ASA892 HNL → SAN Jun 29, 22:10 UTCJun 29, 22:49 UTC40m
2026-06-29 ASA892 HNL → SAN Jun 29, 17:45 UTCJun 29, 18:05 UTC20m
2026-06-29 ASA855 SEA → SJC Jun 29, 10:20 UTCJun 29, 10:40 UTC20m
2026-06-29 ASA855 SEA → SJC Jun 29, 05:15 UTCJun 29, 06:05 UTC50m
2026-06-29 ASA839 SEA → LIH Jun 29, 02:20 UTCJun 29, 03:25 UTC1h 5m
2026-06-28 ASA839 SEA → LIH Jun 28, 21:55 UTCJun 28, 22:10 UTC15m
2026-06-28 ASA869 - Jun 28, 14:09 UTCJun 28, 19:34 UTC5h 25m
2026-06-28 ASA870 - Jun 28, 03:14 UTCJun 28, 03:50 UTC35m
2026-06-27 ASA870 - Jun 27, 22:49 UTCJun 27, 23:10 UTC20m
2026-06-27 ASA879 SFO → OGG Jun 27, 20:14 UTCJun 27, 20:29 UTC15m
2026-06-27 ASA879 SFO → OGG Jun 27, 15:05 UTCJun 27, 16:00 UTC55m
2026-06-27 ASA880 - Jun 27, 12:15 UTCJun 27, 13:09 UTC55m

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 N205HA page for operator, model, and routing details .

Mode-S A1A546 frequently asked

What is Mode-S code A1A546?
A1A546 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N205HA.
Where is Mode-S A1A546 registered?
Mode-S code A1A546 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 A1A546 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A546, octal 50322506, decimal 10,593,606.
What flights does A1A546 operate?
Mode-S A1A546 has broadcast 20 distinct callsigns, including ASA888, ASA878, ASA953, ASA966, ASA964.