Apparatus

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sensors Mode-S transponder

A1ECD6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N223HA · AIRBUS A-321neo · operated by HAWAIIAN AIRLINES INC

Hex
A1ECD6
Octal
50366326
Decimal
10,611,926
Country
US
Tail
N223HA
Type
A21N
No current signal · last broadcast Jul 26, 18:25 UTC
Flights observed
278
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:25 UTC

Last known position

Most recent position reported by Mode-S A1ECD6.

Country allocation

The ICAO 24-bit address A1ECD6 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
ASA966 Alaska Airlines 16 2026-07-21
ASA965 Alaska Airlines 16 2026-07-25
ASA959 Alaska Airlines 14 2026-07-22
ASA953 - 12 2026-07-23
ASA825 Alaska Airlines 10 2026-07-20
ASA972 Alaska Airlines 9 2026-07-17
ASA960 Alaska Airlines 9 2026-07-25
ASA954 Alaska Airlines 9 2026-07-23
ASA932 Alaska Airlines 9 2026-07-24
ASA842 Alaska Airlines 9 2026-07-19
ASA931 Alaska Airlines 8 2026-07-24
ASA843 - 8 2026-07-19
ASA869 - 7 2026-06-23
ASA867 Alaska Airlines 7 2026-06-08
ASA971 Alaska Airlines 6 2026-07-17
ASA967 - 6 2026-07-08
ASA968 - 5 2026-07-06
ASA924 - 5 2026-07-08
ASA868 Alaska Airlines 5 2026-06-07
ASA862 Alaska Airlines 5 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA840 BOS → SEA Jul 26, 18:10 UTCJul 26, 18:25 UTC15m
2026-07-26 ASA854 SJC → SEA Jul 26, 09:25 UTCJul 26, 09:35 UTC10m
2026-07-26 ASA854 SJC → SEA Jul 26, 04:10 UTCJul 26, 04:40 UTC30m
2026-07-26 ASA920 RDU → SEA Jul 26, 01:40 UTCJul 26, 02:20 UTC40m
2026-07-25 ASA920 RDU → SEA Jul 25, 21:30 UTCJul 25, 21:40 UTC10m
2026-07-25 ASA965 SEA → SFO Jul 25, 19:40 UTCJul 25, 19:45 UTC5m
2026-07-25 ASA965 SEA → SFO Jul 25, 14:40 UTCJul 25, 15:30 UTC50m
2026-07-25 ASA960 SEA → GEG Jul 25, 01:10 UTCJul 25, 02:00 UTC50m
2026-07-24 ASA931 RNO → SEA Jul 24, 14:25 UTCJul 24, 15:20 UTC55m
2026-07-24 ASA932 SEA → ABQ Jul 24, 00:50 UTCJul 24, 01:50 UTC1h 0m
2026-07-23 ASA953 - Jul 23, 14:10 UTCJul 23, 14:55 UTC45m
2026-07-23 ASA954 SEA → PDX Jul 23, 01:55 UTCJul 23, 02:40 UTC45m
2026-07-22 ASA959 SEA → GEG Jul 22, 15:40 UTCJul 22, 16:30 UTC50m
2026-07-21 ASA966 GEG → SEA Jul 21, 21:20 UTCJul 22, 01:50 UTC4h 30m
2026-07-21 ASA965 SEA → SFO Jul 21, 14:20 UTCJul 21, 19:20 UTC5h 0m
2026-07-21 ASA966 GEG → SEA Jul 21, 03:05 UTCJul 21, 04:10 UTC1h 5m
2026-07-20 ASA966 GEG → SEA Jul 20, 23:30 UTCJul 20, 23:45 UTC15m
2026-07-20 ASA825 SEA → OGG Jul 20, 21:25 UTCJul 20, 21:45 UTC20m
2026-07-20 ASA825 SEA → OGG Jul 20, 16:25 UTCJul 20, 17:25 UTC1h 0m
2026-07-20 ASA845 SEA → GEG Jul 20, 04:00 UTCJul 20, 04:55 UTC55m
2026-07-19 ASA979 - Jul 19, 16:50 UTCJul 19, 17:25 UTC35m
2026-07-19 ASA842 HNL → SFO Jul 19, 13:40 UTCJul 19, 14:25 UTC45m
2026-07-19 ASA842 HNL → SFO Jul 19, 09:55 UTCJul 19, 10:15 UTC20m
2026-07-19 ASA843 - Jul 19, 07:55 UTCJul 19, 08:10 UTC15m
2026-07-19 ASA843 - Jul 19, 03:15 UTCJul 19, 03:50 UTC35m
2026-07-19 ASA978 SEA → FAT Jul 19, 00:35 UTCJul 19, 01:20 UTC45m
2026-07-18 ASA953 - Jul 18, 14:10 UTCJul 18, 15:00 UTC50m
2026-07-18 ASA954 - Jul 18, 02:09 UTCJul 18, 03:00 UTC51m
2026-07-17 ASA971 SFO → SEA Jul 17, 15:25 UTCJul 17, 16:04 UTC40m
2026-07-17 ASA972 SEA → YYZ Jul 17, 02:45 UTCJul 17, 03:20 UTC35m
2026-07-16 ASA959 - Jul 16, 16:09 UTCJul 16, 16:55 UTC45m
2026-07-14 ASA931 LAS → SMF Jul 14, 14:55 UTCJul 15, 02:45 UTC11h 49m
2026-07-14 ASA932 - Jul 14, 01:20 UTCJul 14, 02:15 UTC55m
2026-07-13 ASA953 - Jul 13, 14:00 UTCJul 13, 14:40 UTC40m
2026-07-13 ASA954 - Jul 13, 02:10 UTCJul 13, 03:10 UTC1h 0m
2026-07-12 ASA959 - Jul 12, 15:40 UTCJul 12, 16:20 UTC40m
2026-07-12 ASA960 - Jul 12, 02:15 UTCJul 12, 02:55 UTC40m
2026-07-11 ASA931 - Jul 11, 14:20 UTCJul 11, 15:25 UTC1h 5m
2026-07-11 ASA932 - Jul 11, 01:20 UTCJul 11, 02:20 UTC1h 0m
2026-07-10 ASA953 - Jul 10, 14:35 UTCJul 10, 15:20 UTC45m
2026-07-10 ASA921 - Jul 10, 03:55 UTCJul 10, 04:35 UTC40m
2026-07-10 ASA921 - Jul 10, 00:00 UTCJul 10, 00:15 UTC15m
2026-07-09 ASA825 - Jul 9, 21:40 UTCJul 9, 21:55 UTC15m
2026-07-09 ASA825 - Jul 9, 16:40 UTCJul 9, 17:05 UTC25m
2026-07-08 ASA964 - Jul 8, 21:55 UTCJul 9, 02:50 UTC4h 55m
2026-07-08 ASA967 - Jul 8, 15:00 UTCJul 8, 19:55 UTC4h 55m
2026-07-08 ASA924 - Jul 8, 03:30 UTCJul 8, 04:15 UTC45m
2026-07-07 ASA9939 - Jul 7, 21:45 UTCJul 7, 22:05 UTC20m
2026-07-07 ASA967 - Jul 7, 04:45 UTCJul 7, 05:15 UTC30m
2026-07-06 ASA968 - Jul 6, 00:00 UTCJul 6, 04:35 UTC4h 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 N223HA page for operator, model, and routing details .

Mode-S A1ECD6 frequently asked

What is Mode-S code A1ECD6?
A1ECD6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N223HA.
Where is Mode-S A1ECD6 registered?
Mode-S code A1ECD6 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 A1ECD6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1ECD6, octal 50366326, decimal 10,611,926.
What flights does A1ECD6 operate?
Mode-S A1ECD6 has broadcast 20 distinct callsigns, including ASA966, ASA965, ASA959, ASA953, ASA825.