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sensors Mode-S transponder

A1B422

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N209HA · AIRBUS A-321neo · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A1B422
Octal
50332042
Decimal
10,597,410
Country
US
Tail
N209HA
Type
A21N
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
271
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S A1B422.

Country allocation

The ICAO 24-bit address A1B422 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
ASA869 Alaska Airlines 16 2026-07-23
ASA870 Alaska Airlines 12 2026-07-22
ASA959 Alaska Airlines 10 2026-07-19
ASA923 - 10 2026-07-15
ASA972 Alaska Airlines 9 2026-07-20
ASA924 - 9 2026-07-17
ASA842 - 9 2026-07-16
ASA931 - 8 2026-06-29
ASA855 Alaska Airlines 8 2026-07-24
ASA966 Alaska Airlines 7 2026-07-19
ASA964 - 7 2026-07-17
ASA932 - 7 2026-06-29
ASA839 Alaska Airlines 7 2026-07-24
ASA825 Alaska Airlines 7 2026-07-18
ASA979 - 6 2026-07-16
ASA967 - 6 2026-07-17
ASA960 - 6 2026-07-02
ASA888 Alaska Airlines 6 2026-06-03
ASA843 - 6 2026-07-16
ASA853 Alaska Airlines 5 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA963 GEG → SEA Jul 26, 16:40 UTCJul 26, 21:55 UTC5h 15m
2026-07-26 ASA845 SEA → GEG Jul 26, 04:50 UTCJul 26, 05:25 UTC35m
2026-07-25 ASA844 LAX → PDX Jul 25, 23:00 UTCJul 25, 23:10 UTC10m
2026-07-25 ASA844 LAX → PDX Jul 25, 18:05 UTCJul 25, 18:30 UTC25m
2026-07-25 ASA853 SEA → HNL Jul 25, 14:40 UTCJul 25, 15:20 UTC40m
2026-07-25 ASA853 SEA → HNL Jul 25, 10:20 UTCJul 25, 10:40 UTC20m
2026-07-25 ASA841 SFO → LAX Jul 25, 06:05 UTCJul 25, 06:25 UTC20m
2026-07-25 ASA841 SFO → LAX Jul 25, 00:50 UTCJul 25, 01:45 UTC55m
2026-07-24 ASA840 BOS → SEA Jul 24, 22:15 UTCJul 24, 23:00 UTC45m
2026-07-24 ASA840 BOS → SEA Jul 24, 18:00 UTCJul 24, 18:10 UTC10m
2026-07-24 ASA855 SEA → SJC Jul 24, 09:50 UTCJul 24, 10:05 UTC15m
2026-07-24 ASA855 SEA → SJC Jul 24, 04:25 UTCJul 24, 05:20 UTC55m
2026-07-24 ASA839 SEA → LIH Jul 24, 01:25 UTCJul 24, 02:25 UTC1h 0m
2026-07-23 ASA869 SJC → KOA Jul 23, 14:15 UTCJul 23, 19:30 UTC5h 15m
2026-07-22 ASA870 LIH → PDX Jul 22, 22:50 UTCJul 23, 03:35 UTC4h 45m
2026-07-22 ASA879 SFO → OGG Jul 22, 20:45 UTCJul 22, 21:00 UTC15m
2026-07-22 ASA879 SFO → OGG Jul 22, 15:25 UTCJul 22, 16:15 UTC50m
2026-07-22 ASA880 KOA → SEA Jul 22, 00:50 UTCJul 22, 13:20 UTC12h 30m
2026-07-21 ASA892 HNL → SAN Jul 21, 22:10 UTCJul 21, 22:55 UTC45m
2026-07-21 ASA892 HNL → SAN Jul 21, 17:50 UTCJul 21, 18:10 UTC20m
2026-07-21 ASA855 SEA → SJC Jul 21, 12:35 UTCJul 21, 12:55 UTC20m
2026-07-21 ASA855 SEA → SJC Jul 21, 07:00 UTCJul 21, 08:00 UTC1h 0m
2026-07-21 ASA839 SEA → LIH Jul 21, 03:45 UTCJul 21, 04:45 UTC1h 0m
2026-07-20 ASA839 SEA → LIH Jul 20, 23:30 UTCJul 20, 23:45 UTC15m
2026-07-20 ASA869 - Jul 20, 19:30 UTCJul 20, 19:45 UTC15m
2026-07-20 ASA869 - Jul 20, 14:15 UTCJul 20, 15:20 UTC1h 5m
2026-07-20 ASA972 SEA → YYZ Jul 20, 02:20 UTCJul 20, 03:00 UTC40m
2026-07-19 ASA959 SEA → GEG Jul 19, 15:45 UTCJul 19, 16:25 UTC40m
2026-07-19 ASA966 GEG → SEA Jul 19, 03:05 UTCJul 19, 03:50 UTC45m
2026-07-18 ASA966 GEG → SEA Jul 18, 23:20 UTCJul 18, 23:30 UTC10m
2026-07-18 ASA825 SEA → OGG Jul 18, 21:45 UTCJul 18, 21:55 UTC10m
2026-07-18 ASA825 SEA → OGG Jul 18, 16:45 UTCJul 18, 17:15 UTC30m
2026-07-17 ASA964 - Jul 17, 22:00 UTCJul 18, 02:50 UTC4h 51m
2026-07-17 ASA967 - Jul 17, 15:05 UTCJul 17, 20:00 UTC4h 55m
2026-07-17 ASA924 - Jul 17, 04:10 UTCJul 17, 05:10 UTC1h 0m
2026-07-16 ASA979 - Jul 16, 16:55 UTCJul 16, 17:25 UTC30m
2026-07-16 ASA842 - Jul 16, 13:25 UTCJul 16, 14:29 UTC1h 5m
2026-07-16 ASA842 - Jul 16, 09:50 UTCJul 16, 10:04 UTC15m
2026-07-16 ASA843 - Jul 16, 07:45 UTCJul 16, 08:00 UTC15m
2026-07-16 ASA843 - Jul 16, 03:10 UTCJul 16, 03:40 UTC30m
2026-07-16 ASA978 - Jul 16, 00:30 UTCJul 16, 01:15 UTC45m
2026-07-15 ASA923 - Jul 15, 14:10 UTCJul 15, 14:45 UTC35m
2026-07-14 ASA979 SFO → OAK Jul 14, 16:55 UTCJul 15, 04:15 UTC11h 19m
2026-07-14 ASA842 - Jul 14, 10:05 UTCJul 14, 14:45 UTC4h 40m
2026-07-14 ASA843 SFO → HNL Jul 14, 03:30 UTCJul 14, 08:30 UTC5h 0m
2026-07-14 ASA978 - Jul 14, 00:55 UTCJul 14, 01:40 UTC45m
2026-07-13 ASA923 - Jul 13, 14:15 UTCJul 13, 14:50 UTC35m
2026-07-12 ASA968 - Jul 12, 23:45 UTCJul 13, 04:35 UTC4h 50m
2026-07-12 ASA963 - Jul 12, 16:40 UTCJul 12, 21:40 UTC5h 0m
2026-07-11 ASA964 HHI → LAX Jul 11, 21:55 UTCJul 12, 03:01 UTC5h 5m

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 N209HA page for operator, model, and routing details .

Mode-S A1B422 frequently asked

What is Mode-S code A1B422?
A1B422 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N209HA.
Where is Mode-S A1B422 registered?
Mode-S code A1B422 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 A1B422 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B422, octal 50332042, decimal 10,597,410.
What flights does A1B422 operate?
Mode-S A1B422 has broadcast 20 distinct callsigns, including ASA869, ASA870, ASA959, ASA923, ASA972.