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sensors Mode-S transponder

A1A18F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N204HA · AIRBUS A-321neo · operated by HAWAIIAN AIRLINES INC

Hex
A1A18F
Octal
50320617
Decimal
10,592,655
Country
US
Tail
N204HA
Type
A21N
No current signal · last broadcast 6h ago
Flights observed
237
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A1A18F.

Country allocation

The ICAO 24-bit address A1A18F 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
ASA923 - 11 2026-07-01
ASA924 - 9 2026-07-03
ASA842 - 9 2026-07-02
ASA965 - 8 2026-07-13
ASA892 Alaska Airlines 8 2026-07-07
ASA843 - 8 2026-07-02
ASA964 - 7 2026-07-05
ASA888 Alaska Airlines 7 2026-05-05
ASA979 Alaska Airlines 6 2026-07-02
ASA978 Alaska Airlines 6 2026-07-02
ASA968 - 6 2026-07-05
ASA966 - 6 2026-07-12
ASA920 - 6 2026-07-14
ASA894 Alaska Airlines 6 2026-07-08
ASA971 - 5 2026-07-09
ASA878 Alaska Airlines 5 2026-05-05
ASA869 - 5 2026-06-26
ASA972 Alaska Airlines 4 2026-06-08
ASA967 - 4 2026-07-05
ASA963 - 4 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA920 - Jul 14, 01:45 UTCJul 14, 02:20 UTC35m
2026-07-13 ASA920 - Jul 13, 21:25 UTCJul 13, 21:35 UTC10m
2026-07-13 ASA965 - Jul 13, 19:30 UTCJul 13, 19:50 UTC20m
2026-07-13 ASA965 - Jul 13, 14:50 UTCJul 13, 15:35 UTC45m
2026-07-12 ASA966 - Jul 12, 21:10 UTCJul 13, 02:05 UTC4h 55m
2026-07-12 ASA965 - Jul 12, 14:10 UTCJul 12, 19:05 UTC4h 55m
2026-07-12 ASA966 - Jul 12, 04:35 UTCJul 12, 05:20 UTC45m
2026-07-12 ASA966 - Jul 12, 00:35 UTCJul 12, 00:45 UTC10m
2026-07-11 ASA825 - Jul 11, 23:05 UTCJul 11, 23:10 UTC5m
2026-07-11 ASA825 - Jul 11, 18:20 UTCJul 11, 18:50 UTC30m
2026-07-11 ASA920 - Jul 11, 01:45 UTCJul 11, 02:20 UTC35m
2026-07-10 ASA920 - Jul 10, 21:35 UTCJul 10, 21:40 UTC5m
2026-07-10 ASA922 - Jul 10, 19:35 UTCJul 10, 19:50 UTC15m
2026-07-10 ASA922 - Jul 10, 14:45 UTCJul 10, 15:25 UTC40m
2026-07-10 ASA954 - Jul 10, 01:55 UTCJul 10, 02:40 UTC45m
2026-07-09 ASA971 - Jul 9, 20:35 UTCJul 9, 20:45 UTC10m
2026-07-09 ASA971 - Jul 9, 15:30 UTCJul 9, 16:05 UTC35m
2026-07-08 ASA870 - Jul 8, 23:05 UTCJul 9, 03:50 UTC4h 45m
2026-07-08 ASA879 SFO → OGG Jul 8, 20:20 UTCJul 8, 20:35 UTC15m
2026-07-08 ASA879 SFO → OGG Jul 8, 15:30 UTCJul 8, 16:15 UTC45m
2026-07-08 ASA880 - Jul 8, 12:45 UTCJul 8, 13:35 UTC50m
2026-07-08 ASA880 - Jul 8, 08:20 UTCJul 8, 08:40 UTC20m
2026-07-08 ASA894 KOA → SAN Jul 8, 05:55 UTCJul 8, 06:15 UTC20m
2026-07-08 ASA894 KOA → SAN Jul 8, 00:50 UTCJul 8, 01:35 UTC45m
2026-07-07 ASA892 HNL → SAN Jul 7, 22:10 UTCJul 7, 22:50 UTC40m
2026-07-07 ASA892 HNL → SAN Jul 7, 17:55 UTCJul 7, 18:15 UTC20m
2026-07-07 ASA855 SEA → SJC Jul 7, 09:40 UTCJul 7, 09:55 UTC15m
2026-07-07 ASA855 SEA → SJC Jul 7, 04:40 UTCJul 7, 05:40 UTC1h 0m
2026-07-07 ASA839 SEA → LIH Jul 7, 01:00 UTCJul 7, 02:00 UTC1h 0m
2026-07-06 ASA839 SEA → LIH Jul 6, 20:30 UTCJul 6, 20:40 UTC10m
2026-07-06 ASA854 - Jul 6, 05:05 UTCJul 6, 10:30 UTC5h 25m
2026-07-05 ASA964 - Jul 5, 21:35 UTCJul 6, 02:20 UTC4h 45m
2026-07-05 ASA967 - Jul 5, 14:55 UTCJul 5, 15:25 UTC30m
2026-07-05 ASA968 - Jul 5, 03:25 UTCJul 5, 04:05 UTC40m
2026-07-04 ASA963 - Jul 4, 16:45 UTCJul 4, 17:20 UTC35m
2026-07-03 ASA964 - Jul 3, 21:50 UTCJul 4, 02:35 UTC4h 45m
2026-07-03 ASA967 - Jul 3, 14:55 UTCJul 3, 15:25 UTC30m
2026-07-03 ASA924 - Jul 3, 03:30 UTCJul 3, 04:25 UTC55m
2026-07-02 ASA979 FAT → SEA Jul 2, 21:25 UTCJul 2, 21:35 UTC10m
2026-07-02 ASA979 FAT → SEA Jul 2, 16:40 UTCJul 2, 17:10 UTC30m
2026-07-02 ASA842 - Jul 2, 14:10 UTCJul 2, 14:45 UTC35m
2026-07-02 ASA842 - Jul 2, 10:10 UTCJul 2, 10:25 UTC15m
2026-07-02 ASA843 - Jul 2, 07:45 UTCJul 2, 08:05 UTC20m
2026-07-02 ASA843 - Jul 2, 03:05 UTCJul 2, 03:40 UTC35m
2026-07-02 ASA978 SEA → FAT Jul 2, 00:40 UTCJul 2, 01:15 UTC35m
2026-07-01 ASA923 - Jul 1, 14:15 UTCJul 1, 14:45 UTC30m
2026-06-30 ASA968 - Jun 30, 23:55 UTCJul 1, 04:25 UTC4h 30m
2026-06-30 ASA963 - Jun 30, 16:15 UTCJun 30, 21:30 UTC5h 15m
2026-06-29 ASA964 - Jun 29, 22:05 UTCJun 30, 03:00 UTC4h 56m
2026-06-29 ASA967 - Jun 29, 15:00 UTCJun 29, 15:34 UTC35m

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 N204HA page for operator, model, and routing details .

Mode-S A1A18F frequently asked

What is Mode-S code A1A18F?
A1A18F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N204HA.
Where is Mode-S A1A18F registered?
Mode-S code A1A18F 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 A1A18F 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 A1A18F, octal 50320617, decimal 10,592,655.
What flights does A1A18F operate?
Mode-S A1A18F has broadcast 20 distinct callsigns, including ASA923, ASA924, ASA842, ASA965, ASA892.