Apparatus

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sensors Mode-S transponder

A4A4E8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N399HA · AIRBUS A-330-200 · operated by HAWAIIAN AIRLINES INC

Hex
A4A4E8
Octal
51122350
Decimal
10,790,120
Country
US
Tail
N399HA
Type
A332
No current signal · last broadcast 1d ago
Flights observed
241
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A4A4E8.

Country allocation

The ICAO 24-bit address A4A4E8 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
ASA900 - 11 2026-06-28
ASA821 Alaska Airlines 10 2026-07-01
ASA829 - 9 2026-06-24
ASA835 - 8 2026-07-09
ASA811 Alaska Airlines 8 2026-07-05
ASA805 - 8 2026-07-08
ASA929 - 7 2026-06-28
ASA850 - 7 2026-07-10
ASA849 - 7 2026-07-10
ASA847 - 7 2026-07-12
ASA817 - 7 2026-07-07
ASA809 Alaska Airlines 7 2026-05-30
ASA830 - 6 2026-06-24
ASA822 - 6 2026-06-30
ASA807 Alaska Airlines 6 2026-05-30
ASA934 - 5 2026-06-29
ASA930 - 5 2026-06-30
ASA836 - 5 2026-07-08
ASA832 - 5 2026-06-22
ASA824 - 5 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 ASA812 - Jul 12, 22:55 UTCJul 13, 03:40 UTC4h 45m
2026-07-12 ASA847 - Jul 12, 20:25 UTCJul 12, 20:45 UTC20m
2026-07-12 ASA847 - Jul 12, 15:50 UTCJul 12, 16:25 UTC35m
2026-07-11 ASA848 - Jul 11, 22:35 UTCJul 12, 03:20 UTC4h 45m
2026-07-11 ASA847 - Jul 11, 20:15 UTCJul 11, 20:35 UTC20m
2026-07-11 ASA847 - Jul 11, 15:40 UTCJul 11, 16:15 UTC35m
2026-07-10 ASA848 - Jul 10, 22:40 UTCJul 11, 03:05 UTC4h 25m
2026-07-10 ASA850 - Jul 10, 19:35 UTCJul 10, 19:45 UTC10m
2026-07-10 ASA850 - Jul 10, 12:00 UTCJul 10, 13:15 UTC1h 15m
2026-07-10 ASA849 - Jul 10, 09:20 UTCJul 10, 09:45 UTC25m
2026-07-10 ASA849 - Jul 10, 00:55 UTCJul 10, 01:15 UTC20m
2026-07-09 ASA835 - Jul 9, 15:30 UTCJul 9, 21:45 UTC6h 15m
2026-07-08 ASA836 - Jul 8, 21:35 UTCJul 9, 02:55 UTC5h 20m
2026-07-08 ASA805 - Jul 8, 01:50 UTCJul 8, 07:30 UTC5h 40m
2026-07-07 ASA806 - Jul 7, 18:10 UTCJul 7, 23:20 UTC5h 10m
2026-07-07 ASA817 LAS → HNL Jul 7, 09:20 UTCJul 7, 15:05 UTC5h 45m
2026-07-06 ASA876 - Jul 6, 23:50 UTCJul 7, 04:55 UTC5h 5m
2026-07-06 ASA850 - Jul 6, 12:15 UTCJul 6, 19:55 UTC7h 40m
2026-07-06 ASA849 - Jul 6, 01:10 UTCJul 6, 09:55 UTC8h 45m
2026-07-05 ASA811 SEA → HNL Jul 5, 20:55 UTCJul 5, 21:10 UTC15m
2026-07-05 ASA811 SEA → HNL Jul 5, 16:10 UTCJul 5, 16:40 UTC30m
2026-07-04 ASA812 - Jul 4, 22:45 UTCJul 5, 03:15 UTC4h 30m
2026-07-04 ASA847 - Jul 4, 15:45 UTCJul 4, 20:50 UTC5h 5m
2026-07-03 ASA848 - Jul 3, 22:45 UTCJul 4, 03:10 UTC4h 25m
2026-07-03 ASA819 PAE → HNL Jul 3, 15:00 UTCJul 3, 20:15 UTC5h 15m
2026-07-03 ASA820 - Jul 3, 00:25 UTCJul 3, 05:05 UTC4h 40m
2026-07-02 ASA815 - Jul 2, 16:50 UTCJul 2, 22:25 UTC5h 35m
2026-07-01 ASA816 - Jul 1, 23:10 UTCJul 2, 03:55 UTC4h 45m
2026-07-01 ASA821 SJC → OGG Jul 1, 20:35 UTCJul 1, 20:55 UTC20m
2026-07-01 ASA821 SJC → OGG Jul 1, 15:30 UTCJul 1, 16:20 UTC50m
2026-06-30 ASA822 - Jun 30, 23:30 UTCJul 1, 04:45 UTC5h 15m
2026-06-30 ASA821 SJC → OGG Jun 30, 20:50 UTCJun 30, 21:15 UTC25m
2026-06-30 ASA821 SJC → OGG Jun 30, 15:45 UTCJun 30, 16:35 UTC50m
2026-06-30 ASA930 - Jun 30, 03:05 UTCJun 30, 04:15 UTC1h 10m
2026-06-29 ASA933 - Jun 29, 15:54 UTCJun 29, 16:29 UTC35m
2026-06-29 ASA934 - Jun 29, 05:20 UTCJun 29, 06:05 UTC45m
2026-06-28 ASA929 - Jun 28, 18:00 UTCJun 28, 18:49 UTC50m
2026-06-28 ASA900 - Jun 28, 14:50 UTCJun 28, 15:49 UTC1h 0m
2026-06-28 ASA900 - Jun 28, 10:35 UTCJun 28, 10:44 UTC10m
2026-06-27 ASA835 SFO → PDX Jun 27, 20:39 UTCJun 27, 21:04 UTC25m
2026-06-27 ASA835 SFO → PDX Jun 27, 15:19 UTCJun 27, 16:39 UTC1h 20m
2026-06-26 ASA836 ANC → OGG Jun 26, 21:30 UTCJun 27, 03:04 UTC5h 35m
2026-06-26 ASA805 LAS → HNL Jun 26, 02:09 UTCJun 26, 07:50 UTC5h 40m
2026-06-25 ASA806 - Jun 25, 18:19 UTCJun 25, 23:24 UTC5h 5m
2026-06-25 ASA866 - Jun 25, 03:04 UTCJun 25, 15:59 UTC12h 55m
2026-06-24 ASA829 - Jun 24, 23:50 UTCJun 25, 00:09 UTC20m
2026-06-24 ASA829 - Jun 24, 13:24 UTCJun 24, 19:44 UTC6h 20m
2026-06-24 ASA830 HNL → JFK Jun 24, 01:24 UTCJun 24, 10:10 UTC8h 45m
2026-06-23 ASA811 SEA → HNL Jun 23, 20:59 UTCJun 23, 21:20 UTC20m
2026-06-23 ASA811 SEA → HNL Jun 23, 16:09 UTCJun 23, 16:44 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 N399HA page for operator, model, and routing details .

Mode-S A4A4E8 frequently asked

What is Mode-S code A4A4E8?
A4A4E8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N399HA.
Where is Mode-S A4A4E8 registered?
Mode-S code A4A4E8 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 A4A4E8 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4A4E8, octal 51122350, decimal 10,790,120.
What flights does A4A4E8 operate?
Mode-S A4A4E8 has broadcast 20 distinct callsigns, including ASA900, ASA821, ASA829, ASA835, ASA811.