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sensors Mode-S transponder

A1C1A0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N212HA · AIRBUS A-321neo · operated by HAWAIIAN AIRLINES INC

Hex
A1C1A0
Octal
50340640
Decimal
10,600,864
Country
US
Tail
N212HA
Type
A21N
No current signal · last broadcast 7h ago
Flights observed
273
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A1C1A0.

Country allocation

The ICAO 24-bit address A1C1A0 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
ASA904 Alaska Airlines 13 2026-06-04
ASA846 Alaska Airlines 11 2026-05-11
ASA842 - 11 2026-07-08
ASA839 Alaska Airlines 10 2026-07-20
ASA924 - 9 2026-07-09
ASA892 Alaska Airlines 9 2026-07-20
ASA855 Alaska Airlines 9 2026-07-20
ASA825 - 9 2026-07-10
ASA870 Alaska Airlines 8 2026-07-22
ASA967 - 7 2026-07-09
ASA869 - 7 2026-07-19
ASA843 - 7 2026-07-08
ASA979 Alaska Airlines 6 2026-07-08
ASA968 - 6 2026-06-29
ASA964 - 6 2026-07-09
ASA894 Alaska Airlines 6 2026-07-21
ASA972 Alaska Airlines 5 2026-07-23
ASA971 Alaska Airlines 5 2026-07-22
ASA963 - 5 2026-06-28
ASA954 Alaska Airlines 5 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ASA954 SEA → PDX Jul 23, 15:25 UTCJul 24, 02:40 UTC11h 15m
2026-07-23 ASA972 SEA → YYZ Jul 23, 02:40 UTCJul 23, 03:20 UTC40m
2026-07-22 ASA971 SFO → SEA Jul 22, 20:20 UTCJul 22, 20:30 UTC10m
2026-07-22 ASA971 SFO → SEA Jul 22, 15:20 UTCJul 22, 15:50 UTC30m
2026-07-22 ASA870 LIH → PDX Jul 22, 03:35 UTCJul 22, 04:10 UTC35m
2026-07-21 ASA870 LIH → PDX Jul 21, 23:25 UTCJul 21, 23:45 UTC20m
2026-07-21 ASA879 SFO → OGG Jul 21, 20:55 UTCJul 21, 21:15 UTC20m
2026-07-21 ASA879 SFO → OGG Jul 21, 15:50 UTCJul 21, 16:40 UTC50m
2026-07-21 ASA880 KOA → SEA Jul 21, 13:05 UTCJul 21, 13:55 UTC50m
2026-07-21 ASA880 KOA → SEA Jul 21, 09:10 UTCJul 21, 09:20 UTC10m
2026-07-21 ASA894 KOA → SAN Jul 21, 01:30 UTCJul 21, 07:20 UTC5h 50m
2026-07-20 ASA892 HNL → SAN Jul 20, 21:10 UTCJul 20, 22:40 UTC1h 30m
2026-07-20 ASA892 HNL → SAN Jul 20, 17:40 UTCJul 20, 17:55 UTC15m
2026-07-20 ASA855 SEA → SJC Jul 20, 09:55 UTCJul 20, 10:10 UTC15m
2026-07-20 ASA855 SEA → SJC Jul 20, 04:30 UTCJul 20, 05:25 UTC55m
2026-07-20 ASA839 SEA → LIH Jul 20, 01:40 UTCJul 20, 02:30 UTC50m
2026-07-19 ASA839 SEA → LIH Jul 19, 21:25 UTCJul 19, 21:35 UTC10m
2026-07-19 ASA869 - Jul 19, 14:20 UTCJul 19, 19:40 UTC5h 20m
2026-07-19 ASA972 SEA → YYZ Jul 19, 03:00 UTCJul 19, 03:35 UTC35m
2026-07-18 ASA959 - Jul 18, 15:50 UTCJul 18, 16:40 UTC50m
2026-07-17 ASA966 - Jul 17, 21:25 UTCJul 18, 02:05 UTC4h 40m
2026-07-17 ASA965 - Jul 17, 14:10 UTCJul 17, 19:15 UTC5h 5m
2026-07-17 ASA960 - Jul 17, 01:25 UTCJul 17, 02:25 UTC1h 0m
2026-07-16 ASA931 - Jul 16, 14:40 UTCJul 16, 15:40 UTC1h 0m
2026-07-16 ASA932 - Jul 16, 00:50 UTCJul 16, 01:45 UTC55m
2026-07-15 ASA953 - Jul 15, 14:10 UTCJul 15, 14:55 UTC45m
2026-07-15 ASA954 - Jul 15, 02:05 UTCJul 15, 02:55 UTC50m
2026-07-14 ASA971 - Jul 14, 15:25 UTCJul 14, 16:00 UTC35m
2026-07-14 ASA972 - Jul 14, 02:35 UTCJul 14, 03:15 UTC40m
2026-07-13 ASA959 - Jul 13, 15:40 UTCJul 13, 16:35 UTC55m
2026-07-13 ASA960 - Jul 13, 01:15 UTCJul 13, 02:15 UTC1h 0m
2026-07-12 ASA931 - Jul 12, 14:25 UTCJul 12, 15:25 UTC1h 0m
2026-07-12 ASA932 - Jul 12, 01:10 UTCJul 12, 02:05 UTC55m
2026-07-11 ASA953 - Jul 11, 14:20 UTCJul 11, 14:55 UTC35m
2026-07-11 ASA921 - Jul 11, 03:05 UTCJul 11, 03:45 UTC40m
2026-07-10 ASA921 - Jul 10, 23:05 UTCJul 10, 23:15 UTC10m
2026-07-10 ASA825 - Jul 10, 21:25 UTCJul 10, 21:30 UTC5m
2026-07-10 ASA825 - Jul 10, 16:20 UTCJul 10, 16:50 UTC30m
2026-07-09 ASA964 - Jul 9, 22:00 UTCJul 10, 02:50 UTC4h 50m
2026-07-09 ASA967 - Jul 9, 15:00 UTCJul 9, 20:00 UTC5h 0m
2026-07-09 ASA924 - Jul 9, 03:15 UTCJul 9, 03:50 UTC35m
2026-07-08 ASA979 FAT → SEA Jul 8, 16:40 UTCJul 8, 17:15 UTC35m
2026-07-08 ASA842 - Jul 8, 13:45 UTCJul 8, 14:25 UTC40m
2026-07-08 ASA842 - Jul 8, 09:45 UTCJul 8, 10:05 UTC20m
2026-07-08 ASA843 - Jul 8, 03:05 UTCJul 8, 07:50 UTC4h 45m
2026-07-08 ASA978 SEA → FAT Jul 8, 00:40 UTCJul 8, 01:20 UTC40m
2026-07-07 ASA923 - Jul 7, 14:20 UTCJul 7, 15:00 UTC40m
2026-07-07 ASA924 - Jul 7, 03:05 UTCJul 7, 03:50 UTC45m
2026-07-06 ASA979 FAT → SEA Jul 6, 16:45 UTCJul 6, 17:15 UTC30m
2026-07-06 ASA842 - Jul 6, 14:10 UTCJul 6, 15:00 UTC50m

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 N212HA page for operator, model, and routing details .

Mode-S A1C1A0 frequently asked

What is Mode-S code A1C1A0?
A1C1A0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N212HA.
Where is Mode-S A1C1A0 registered?
Mode-S code A1C1A0 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 A1C1A0 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1C1A0, octal 50340640, decimal 10,600,864.
What flights does A1C1A0 operate?
Mode-S A1C1A0 has broadcast 20 distinct callsigns, including ASA904, ASA846, ASA842, ASA839, ASA924.