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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 Jul 26, 15:40 UTC
Flights observed
291
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 15:40 UTC

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
ASA965 Alaska Airlines 12 2026-07-20
ASA966 Alaska Airlines 11 2026-07-19
ASA870 - 9 2026-07-16
ASA847 Alaska Airlines 9 2026-06-09
ASA967 Alaska Airlines 8 2026-07-24
ASA908 Alaska Airlines 8 2026-06-08
ASA867 Alaska Airlines 7 2026-06-06
ASA843 Alaska Airlines 7 2026-07-23
ASA825 - 7 2026-07-01
ASA964 Alaska Airlines 6 2026-07-24
ASA959 - 6 2026-07-04
ASA953 - 6 2026-07-17
ASA932 - 6 2026-07-18
ASA931 - 6 2026-07-18
ASA907 Alaska Airlines 6 2026-06-08
ASA892 Alaska Airlines 6 2026-07-08
ASA880 - 6 2026-07-09
ASA879 - 6 2026-07-12
ASA869 - 6 2026-07-13
ASA868 Alaska Airlines 6 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA923 OAK → OGG Jul 26, 14:55 UTCJul 26, 15:40 UTC45m
2026-07-25 ASA968 LIH → OAK Jul 25, 23:35 UTCJul 26, 04:10 UTC4h 35m
2026-07-25 ASA963 GEG → SEA Jul 25, 16:25 UTCJul 25, 21:40 UTC5h 15m
2026-07-24 ASA964 GEG → SEA Jul 24, 23:30 UTCJul 25, 04:30 UTC5h 0m
2026-07-24 ASA967 OAK → LIH Jul 24, 15:00 UTCJul 24, 20:00 UTC5h 0m
2026-07-24 ASA924 RDM → SEA Jul 24, 02:55 UTCJul 24, 03:40 UTC45m
2026-07-23 ASA979 FAT → SEA Jul 23, 16:55 UTCJul 23, 17:35 UTC40m
2026-07-23 ASA842 HNL → SFO Jul 23, 14:20 UTCJul 23, 15:05 UTC45m
2026-07-23 ASA842 HNL → SFO Jul 23, 10:45 UTCJul 23, 11:05 UTC20m
2026-07-23 ASA843 SFO → LAX Jul 23, 08:30 UTCJul 23, 08:45 UTC15m
2026-07-23 ASA843 SFO → LAX Jul 23, 03:30 UTCJul 23, 04:05 UTC35m
2026-07-23 ASA978 SEA → FAT Jul 23, 00:20 UTCJul 23, 01:05 UTC45m
2026-07-22 ASA923 - Jul 22, 14:10 UTCJul 22, 14:40 UTC30m
2026-07-21 ASA968 LIH → OAK Jul 21, 23:45 UTCJul 22, 04:05 UTC4h 20m
2026-07-21 ASA963 GEG → SEA Jul 21, 16:50 UTCJul 21, 22:00 UTC5h 10m
2026-07-21 ASA920 RDU → SEA Jul 21, 02:05 UTCJul 21, 03:30 UTC1h 25m
2026-07-20 ASA920 RDU → SEA Jul 20, 22:35 UTCJul 20, 22:50 UTC15m
2026-07-20 ASA965 SEA → SFO Jul 20, 19:45 UTCJul 20, 20:00 UTC15m
2026-07-20 ASA965 SEA → SFO Jul 20, 14:55 UTCJul 20, 15:35 UTC40m
2026-07-19 ASA966 GEG → SEA Jul 19, 21:50 UTCJul 20, 02:25 UTC4h 35m
2026-07-19 ASA965 SEA → SFO Jul 19, 14:40 UTCJul 19, 19:45 UTC5h 5m
2026-07-19 ASA960 - Jul 19, 01:20 UTCJul 19, 02:05 UTC45m
2026-07-18 ASA931 - Jul 18, 14:20 UTCJul 18, 15:25 UTC1h 5m
2026-07-18 ASA932 - Jul 18, 00:55 UTCJul 18, 02:00 UTC1h 5m
2026-07-17 ASA953 - Jul 17, 14:10 UTCJul 17, 14:55 UTC45m
2026-07-17 ASA954 - Jul 17, 02:15 UTCJul 17, 02:59 UTC45m
2026-07-16 ASA971 - Jul 16, 15:35 UTCJul 16, 16:09 UTC35m
2026-07-16 ASA870 - Jul 16, 03:45 UTCJul 16, 04:25 UTC40m
2026-07-15 ASA870 - Jul 15, 23:25 UTCJul 15, 23:45 UTC20m
2026-07-15 ASA855 - Jul 15, 09:30 UTCJul 15, 09:40 UTC10m
2026-07-15 ASA855 - Jul 15, 04:10 UTCJul 15, 05:05 UTC55m
2026-07-15 ASA839 - Jul 15, 01:10 UTCJul 15, 01:55 UTC45m
2026-07-14 ASA839 - Jul 14, 20:35 UTCJul 14, 20:45 UTC10m
2026-07-13 ASA869 - Jul 13, 14:25 UTCJul 13, 19:40 UTC5h 15m
2026-07-13 ASA870 - Jul 13, 03:10 UTCJul 13, 03:45 UTC35m
2026-07-12 ASA870 - Jul 12, 22:45 UTCJul 12, 23:05 UTC20m
2026-07-12 ASA879 - Jul 12, 20:20 UTCJul 12, 20:35 UTC15m
2026-07-12 ASA879 - Jul 12, 15:15 UTCJul 12, 16:15 UTC1h 0m
2026-07-12 ASA884 - Jul 12, 02:55 UTCJul 12, 03:45 UTC50m
2026-07-11 ASA884 - Jul 11, 22:35 UTCJul 11, 22:50 UTC15m
2026-07-11 ASA883 - Jul 11, 15:30 UTCJul 11, 20:55 UTC5h 25m
2026-07-10 ASA884 - Jul 10, 22:30 UTCJul 11, 03:40 UTC5h 10m
2026-07-10 ASA883 - Jul 10, 15:45 UTCJul 10, 20:55 UTC5h 10m
2026-07-09 ASA884 - Jul 9, 22:35 UTCJul 10, 03:45 UTC5h 10m
2026-07-09 ASA883 - Jul 9, 15:25 UTCJul 9, 20:20 UTC4h 55m
2026-07-09 ASA880 - Jul 9, 12:35 UTCJul 9, 13:25 UTC50m
2026-07-09 ASA880 - Jul 9, 08:15 UTCJul 9, 08:30 UTC15m
2026-07-09 ASA894 KOA → SAN Jul 9, 01:05 UTCJul 9, 06:40 UTC5h 35m
2026-07-08 ASA892 HNL → SAN Jul 8, 17:55 UTCJul 8, 23:10 UTC5h 15m
2026-07-08 ASA9915 - Jul 8, 15:40 UTCJul 8, 15:55 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 Jul 26, 15:40 UTC.
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 ASA965, ASA966, ASA870, ASA847, ASA967.