Apparatus

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sensors Mode-S transponder

A19A21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N202HA · AIRBUS A-321neo · operated by HAWAIIAN AIRLINES INC

Hex
A19A21
Octal
50315041
Decimal
10,590,753
Country
US
Tail
N202HA
Type
A21N
No current signal · last broadcast 6h ago
Flights observed
128
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A19A21.

Country allocation

The ICAO 24-bit address A19A21 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
ASA847 Alaska Airlines 8 2026-05-25
ASA965 Alaska Airlines 5 2026-05-17
ASA959 Alaska Airlines 5 2026-05-18
ASA931 Alaska Airlines 5 2026-05-15
ASA891 Alaska Airlines 5 2026-05-04
ASA967 Alaska Airlines 4 2026-05-11
ASA966 Alaska Airlines 4 2026-05-18
ASA953 Alaska Airlines 4 2026-05-29
ASA932 Alaska Airlines 4 2026-05-15
ASA908 Alaska Airlines 4 2026-05-27
ASA892 Alaska Airlines 4 2026-05-04
ASA869 Alaska Airlines 4 2026-05-10
ASA861 Alaska Airlines 4 2026-05-30
ASA848 Alaska Airlines 4 2026-05-25
ASA954 Alaska Airlines 3 2026-05-29
ASA941 Alaska Airlines 3 2026-05-28
ASA907 Alaska Airlines 3 2026-05-27
ASA868 Alaska Airlines 3 2026-05-03
ASA867 Alaska Airlines 3 2026-05-03
ASA825 Alaska Airlines 3 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ASA861 SEA → OGG May 30, 08:10 UTCMay 30, 08:30 UTC20m
2026-05-30 ASA861 SEA → OGG May 30, 03:25 UTCMay 30, 03:55 UTC30m
2026-05-30 ASA942 ORD → SEA May 30, 00:40 UTCMay 30, 01:20 UTC40m
2026-05-29 ASA953 SJC → OGG May 29, 14:10 UTCMay 29, 14:50 UTC40m
2026-05-29 ASA954 SEA → PDX May 29, 04:50 UTCMay 29, 05:25 UTC35m
2026-05-28 ASA941 SEA → ORD May 28, 23:10 UTCMay 28, 23:20 UTC10m
2026-05-28 ASA941 SEA → ORD May 28, 18:35 UTCMay 28, 19:05 UTC30m
2026-05-28 ASA862 OGG → SEA May 28, 16:00 UTCMay 28, 16:35 UTC35m
2026-05-28 ASA862 OGG → SEA May 28, 11:55 UTCMay 28, 12:10 UTC15m
2026-05-27 ASA907 RDM → SEA May 27, 20:40 UTCMay 27, 21:00 UTC20m
2026-05-27 ASA907 RDM → SEA May 27, 15:55 UTCMay 27, 16:40 UTC45m
2026-05-27 ASA908 SEA → DFW May 27, 12:40 UTCMay 27, 13:35 UTC55m
2026-05-27 ASA908 SEA → DFW May 27, 08:15 UTCMay 27, 08:30 UTC15m
2026-05-26 ASA843 SFO → LAX May 26, 09:09 UTCMay 26, 09:29 UTC20m
2026-05-26 ASA843 SFO → LAX May 26, 04:15 UTCMay 26, 05:10 UTC55m
2026-05-26 ASA844 LAX → PDX May 26, 01:24 UTCMay 26, 02:29 UTC1h 5m
2026-05-25 ASA844 LAX → PDX May 25, 20:55 UTCMay 25, 21:09 UTC15m
2026-05-25 ASA847 OAK → HNL May 25, 18:35 UTCMay 25, 18:55 UTC20m
2026-05-25 ASA847 OAK → HNL May 25, 14:20 UTCMay 25, 14:50 UTC30m
2026-05-25 ASA848 HNL → SEA May 25, 03:00 UTCMay 25, 03:35 UTC35m
2026-05-24 ASA907 RDM → SEA May 24, 15:20 UTCMay 24, 20:25 UTC5h 5m
2026-05-24 ASA908 SEA → DFW May 24, 12:25 UTCMay 24, 13:15 UTC50m
2026-05-24 ASA908 SEA → DFW May 24, 08:00 UTCMay 24, 08:20 UTC20m
2026-05-24 ASA896 HNL → SEA May 24, 02:00 UTCMay 24, 02:50 UTC50m
2026-05-23 ASA895 SAN → HNL May 23, 02:45 UTCMay 24, 02:15 UTC23h 30m
2026-05-22 ASA847 OAK → HNL May 22, 14:10 UTCMay 22, 19:05 UTC4h 55m
2026-05-22 ASA968 LIH → OAK May 22, 04:50 UTCMay 22, 05:25 UTC35m
2026-05-21 ASA963 GEG → SEA May 21, 17:05 UTCMay 21, 22:05 UTC5h 0m
2026-05-21 ASA897 SAN → KOA May 21, 14:10 UTCMay 21, 14:55 UTC45m
2026-05-21 ASA897 SAN → KOA May 21, 10:00 UTCMay 21, 10:15 UTC15m
2026-05-21 ASA861 SEA → OGG May 21, 07:55 UTCMay 21, 08:20 UTC25m
2026-05-21 ASA861 SEA → OGG May 21, 03:25 UTCMay 21, 03:55 UTC30m
2026-05-21 ASA942 ORD → SEA May 21, 01:05 UTCMay 21, 01:45 UTC40m
2026-05-20 ASA953 SJC → OGG May 20, 14:20 UTCMay 20, 14:55 UTC35m
2026-05-20 ASA954 SEA → PDX May 20, 03:30 UTCMay 20, 04:20 UTC50m
2026-05-19 ASA971 SFO → SEA May 19, 16:25 UTCMay 19, 17:00 UTC35m
2026-05-18 ASA959 SEA → GEG May 18, 16:00 UTCMay 19, 03:15 UTC11h 14m
2026-05-18 ASA966 GEG → SEA May 18, 01:25 UTCMay 18, 02:00 UTC35m
2026-05-17 ASA965 SEA → SFO May 17, 14:15 UTCMay 17, 14:45 UTC30m
2026-05-16 ASA966 GEG → SEA May 16, 20:45 UTCMay 17, 01:45 UTC5h 0m
2026-05-16 ASA965 SEA → SFO May 16, 19:10 UTCMay 16, 19:25 UTC15m
2026-05-16 ASA965 SEA → SFO May 16, 14:16 UTCMay 16, 14:46 UTC30m
2026-05-16 ASA960 SEA → GEG May 16, 01:55 UTCMay 16, 02:35 UTC40m
2026-05-15 ASA931 RNO → SEA May 15, 14:55 UTCMay 15, 15:55 UTC1h 0m
2026-05-15 ASA932 SEA → ABQ May 15, 01:00 UTCMay 15, 02:15 UTC1h 15m
2026-05-14 ASA923 OAK → OGG May 14, 14:30 UTCMay 14, 14:55 UTC25m
2026-05-14 ASA968 LIH → OAK May 14, 04:05 UTCMay 14, 04:45 UTC40m
2026-05-13 ASA963 GEG → SEA May 13, 17:10 UTCMay 13, 22:05 UTC4h 55m
2026-05-13 ASA964 GEG → SEA May 13, 06:35 UTCMay 13, 07:25 UTC50m
2026-05-13 ASA9933 LIH → HNL May 13, 00:05 UTCMay 13, 00:20 UTC15m

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 N202HA page for operator, model, and routing details .

Mode-S A19A21 frequently asked

What is Mode-S code A19A21?
A19A21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N202HA.
Where is Mode-S A19A21 registered?
Mode-S code A19A21 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 A19A21 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A19A21, octal 50315041, decimal 10,590,753.
What flights does A19A21 operate?
Mode-S A19A21 has broadcast 20 distinct callsigns, including ASA847, ASA965, ASA959, ASA931, ASA891.