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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 Jul 26, 21:30 UTC
Flights observed
280
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

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
ASA965 Alaska Airlines 11 2026-07-26
ASA923 - 11 2026-07-01
ASA842 Alaska Airlines 11 2026-07-22
ASA924 - 9 2026-07-03
ASA892 Alaska Airlines 9 2026-07-19
ASA920 Alaska Airlines 8 2026-07-19
ASA894 Alaska Airlines 8 2026-07-20
ASA843 - 8 2026-07-02
ASA979 Alaska Airlines 7 2026-07-22
ASA966 Alaska Airlines 7 2026-07-26
ASA964 - 7 2026-07-05
ASA888 Alaska Airlines 7 2026-05-05
ASA978 Alaska Airlines 6 2026-07-02
ASA968 - 6 2026-07-05
ASA931 Alaska Airlines 6 2026-07-25
ASA880 Alaska Airlines 6 2026-07-20
ASA879 Alaska Airlines 6 2026-07-20
ASA870 Alaska Airlines 6 2026-07-21
ASA869 Alaska Airlines 6 2026-07-21
ASA825 Alaska Airlines 6 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA966 GEG → SEA Jul 26, 21:10 UTCJul 26, 21:30 UTC20m
2026-07-26 ASA965 SEA → SFO Jul 26, 14:10 UTCJul 26, 19:15 UTC5h 5m
2026-07-26 ASA960 SEA → GEG Jul 26, 01:10 UTCJul 26, 02:10 UTC1h 0m
2026-07-25 ASA931 RNO → SEA Jul 25, 19:45 UTCJul 25, 19:55 UTC10m
2026-07-25 ASA931 RNO → SEA Jul 25, 14:20 UTCJul 25, 15:20 UTC1h 0m
2026-07-25 ASA932 SEA → ABQ Jul 25, 00:30 UTCJul 25, 01:50 UTC1h 20m
2026-07-24 ASA953 SJC → OGG Jul 24, 14:15 UTCJul 24, 15:05 UTC50m
2026-07-24 ASA921 PDX → FLL Jul 24, 03:15 UTCJul 24, 03:55 UTC40m
2026-07-23 ASA921 PDX → FLL Jul 23, 23:30 UTCJul 23, 23:50 UTC20m
2026-07-23 ASA825 SEA → OGG Jul 23, 21:50 UTCJul 23, 22:00 UTC10m
2026-07-23 ASA825 SEA → OGG Jul 23, 16:45 UTCJul 23, 17:15 UTC30m
2026-07-23 ASA845 SEA → GEG Jul 23, 04:55 UTCJul 23, 05:40 UTC45m
2026-07-22 ASA979 FAT → SEA Jul 22, 18:40 UTCJul 22, 19:10 UTC30m
2026-07-22 ASA842 HNL → SFO Jul 22, 15:50 UTCJul 22, 16:40 UTC50m
2026-07-22 ASA842 HNL → SFO Jul 22, 12:20 UTCJul 22, 12:30 UTC10m
2026-07-22 ASA855 SEA → SJC Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-22 ASA839 SEA → LIH Jul 22, 01:55 UTCJul 22, 02:50 UTC55m
2026-07-21 ASA839 SEA → LIH Jul 21, 21:50 UTCJul 21, 22:05 UTC15m
2026-07-21 ASA869 SJC → KOA Jul 21, 14:15 UTCJul 21, 19:45 UTC5h 30m
2026-07-21 ASA870 LIH → PDX Jul 21, 02:25 UTCJul 21, 04:00 UTC1h 35m
2026-07-20 ASA870 LIH → PDX Jul 20, 22:55 UTCJul 20, 23:15 UTC20m
2026-07-20 ASA879 SFO → OGG Jul 20, 20:40 UTCJul 20, 21:05 UTC25m
2026-07-20 ASA879 SFO → OGG Jul 20, 15:30 UTCJul 20, 16:20 UTC50m
2026-07-20 ASA880 KOA → SEA Jul 20, 12:30 UTCJul 20, 13:20 UTC50m
2026-07-20 ASA880 KOA → SEA Jul 20, 08:20 UTCJul 20, 08:35 UTC15m
2026-07-20 ASA894 KOA → SAN Jul 20, 06:10 UTCJul 20, 06:30 UTC20m
2026-07-20 ASA894 KOA → SAN Jul 20, 00:50 UTCJul 20, 02:05 UTC1h 15m
2026-07-19 ASA892 HNL → SAN Jul 19, 21:20 UTCJul 19, 22:40 UTC1h 20m
2026-07-19 ASA854 SJC → SEA Jul 19, 04:25 UTCJul 19, 09:50 UTC5h 25m
2026-07-19 ASA920 RDU → SEA Jul 19, 01:45 UTCJul 19, 02:20 UTC35m
2026-07-18 ASA920 RDU → SEA Jul 18, 21:25 UTCJul 18, 21:35 UTC10m
2026-07-18 ASA965 - Jul 18, 19:45 UTCJul 18, 19:55 UTC10m
2026-07-18 ASA965 - Jul 18, 14:45 UTCJul 18, 15:40 UTC55m
2026-07-18 ASA960 - Jul 18, 01:34 UTCJul 18, 02:25 UTC50m
2026-07-17 ASA931 - Jul 17, 14:35 UTCJul 17, 15:35 UTC1h 0m
2026-07-17 ASA932 - Jul 17, 00:55 UTCJul 17, 02:10 UTC1h 15m
2026-07-16 ASA953 - Jul 16, 14:10 UTCJul 16, 14:50 UTC40m
2026-07-15 ASA956 - Jul 15, 21:10 UTCJul 16, 01:55 UTC4h 45m
2026-07-15 ASA955 - Jul 15, 14:15 UTCJul 15, 19:15 UTC5h 0m
2026-07-15 ASA921 - Jul 15, 03:15 UTCJul 15, 03:55 UTC40m
2026-07-14 ASA921 - Jul 14, 23:15 UTCJul 14, 23:30 UTC15m
2026-07-14 ASA825 - Jul 14, 21:20 UTCJul 14, 21:30 UTC10m
2026-07-14 ASA825 - Jul 14, 16:15 UTCJul 14, 16:45 UTC30m
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

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 Jul 26, 21:30 UTC.
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 ASA965, ASA923, ASA842, ASA924, ASA892.