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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 Jul 26, 20:30 UTC
Flights observed
307
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

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
ASA880 Alaska Airlines 11 2026-07-26
ASA879 Alaska Airlines 11 2026-07-26
ASA954 - 10 2026-07-20
ASA953 - 10 2026-07-20
ASA878 Alaska Airlines 10 2026-05-22
ASA965 Alaska Airlines 9 2026-07-22
ASA870 Alaska Airlines 9 2026-07-18
ASA966 - 8 2026-07-05
ASA964 - 8 2026-06-19
ASA920 Alaska Airlines 8 2026-07-23
ASA904 Alaska Airlines 8 2026-06-03
ASA971 Alaska Airlines 7 2026-07-19
ASA960 Alaska Airlines 7 2026-07-22
ASA941 Alaska Airlines 7 2026-06-01
ASA931 - 7 2026-07-21
ASA862 Alaska Airlines 7 2026-06-01
ASA861 Alaska Airlines 7 2026-06-03
ASA825 - 7 2026-07-04
ASA968 - 6 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA879 SFO → OGG Jul 26, 20:10 UTCJul 26, 20:30 UTC20m
2026-07-26 ASA879 SFO → OGG Jul 26, 15:00 UTCJul 26, 15:50 UTC50m
2026-07-26 ASA880 KOA → SEA Jul 26, 12:20 UTCJul 26, 13:10 UTC50m
2026-07-26 ASA880 KOA → SEA Jul 26, 08:05 UTCJul 26, 08:20 UTC15m
2026-07-26 ASA896 HNL → SEA Jul 26, 03:40 UTCJul 26, 04:10 UTC30m
2026-07-25 ASA895 SAN → HNL Jul 25, 03:25 UTCJul 25, 04:00 UTC35m
2026-07-24 ASA879 SFO → OGG Jul 24, 15:20 UTCJul 24, 20:45 UTC5h 25m
2026-07-24 ASA880 KOA → SEA Jul 24, 12:25 UTCJul 24, 13:10 UTC45m
2026-07-24 ASA880 KOA → SEA Jul 24, 08:20 UTCJul 24, 08:35 UTC15m
2026-07-24 ASA894 KOA → SAN Jul 24, 00:45 UTCJul 24, 06:20 UTC5h 35m
2026-07-23 ASA892 HNL → SAN Jul 23, 18:00 UTCJul 23, 23:10 UTC5h 10m
2026-07-23 ASA854 SJC → SEA Jul 23, 04:35 UTCJul 23, 10:05 UTC5h 30m
2026-07-23 ASA920 RDU → SEA Jul 23, 01:45 UTCJul 23, 02:25 UTC40m
2026-07-22 ASA920 RDU → SEA Jul 22, 21:35 UTCJul 22, 21:50 UTC15m
2026-07-22 ASA965 SEA → SFO Jul 22, 19:50 UTCJul 22, 19:55 UTC5m
2026-07-22 ASA965 SEA → SFO Jul 22, 14:50 UTCJul 22, 15:35 UTC45m
2026-07-22 ASA960 SEA → GEG Jul 22, 01:10 UTCJul 22, 02:05 UTC55m
2026-07-21 ASA931 RNO → SEA Jul 21, 20:05 UTCJul 21, 20:15 UTC10m
2026-07-21 ASA931 - Jul 21, 14:25 UTCJul 21, 15:25 UTC1h 0m
2026-07-21 ASA932 SEA → ABQ Jul 21, 00:20 UTCJul 21, 02:10 UTC1h 50m
2026-07-20 ASA953 - Jul 20, 14:25 UTCJul 20, 15:30 UTC1h 5m
2026-07-20 ASA954 - Jul 20, 02:00 UTCJul 20, 02:55 UTC55m
2026-07-19 ASA971 SFO → SEA Jul 19, 15:20 UTCJul 19, 15:55 UTC35m
2026-07-18 ASA870 LIH → PDX Jul 18, 22:45 UTCJul 19, 03:35 UTC4h 50m
2026-07-18 ASA879 SFO → OGG Jul 18, 20:25 UTCJul 18, 20:45 UTC20m
2026-07-18 ASA879 SFO → OGG Jul 18, 15:20 UTCJul 18, 16:10 UTC50m
2026-07-18 ASA880 KOA → SEA Jul 18, 12:35 UTCJul 18, 13:20 UTC45m
2026-07-18 ASA841 SFO → LAX Jul 18, 06:15 UTCJul 18, 06:35 UTC20m
2026-07-18 ASA841 SFO → LAX Jul 18, 01:25 UTCJul 18, 02:09 UTC45m
2026-07-17 ASA840 BOS → SEA Jul 17, 22:49 UTCJul 17, 23:39 UTC50m
2026-07-17 ASA840 BOS → SEA Jul 17, 18:34 UTCJul 17, 18:50 UTC15m
2026-07-17 ASA854 SJC → SEA Jul 17, 04:29 UTCJul 17, 09:45 UTC5h 15m
2026-07-17 ASA920 - Jul 17, 01:49 UTCJul 17, 02:34 UTC45m
2026-07-16 ASA920 - Jul 16, 21:45 UTCJul 16, 21:55 UTC10m
2026-07-16 ASA922 - Jul 16, 19:45 UTCJul 16, 19:50 UTC5m
2026-07-16 ASA922 - Jul 16, 14:45 UTCJul 16, 15:40 UTC55m
2026-07-16 ASA954 - Jul 16, 02:10 UTCJul 16, 02:50 UTC40m
2026-07-15 ASA971 - Jul 15, 15:35 UTCJul 15, 16:10 UTC35m
2026-07-15 ASA972 - Jul 15, 02:30 UTCJul 15, 03:05 UTC35m
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

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 Jul 26, 20:30 UTC.
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, ASA880, ASA879, ASA954, ASA953.