Apparatus

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sensors Mode-S transponder

71C584

ICAO 24-bit transponder address · allocated to Korea, South

Currently assigned to HL8584 · AIRBUS A-321neo

Hex
71C584
Octal
34342604
Decimal
7,456,132
Country
KR
Tail
HL8584
Type
A21N
No current signal · last broadcast 50m ago
Flights observed
358
Distinct callsigns
20
Country
KR
Last broadcast
50m ago

Last known position

Most recent position reported by Mode-S 71C584.

Country allocation

The ICAO 24-bit address 71C584 falls within the block assigned to Korea, South (KR) by ICAO Annex 10, Volume III. Every aircraft registered in Korea, South 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
AAR332 - 21 2026-07-06
AAR331 - 13 2026-07-05
AAR336 - 11 2026-06-26
AAR353 - 9 2026-07-08
AAR335 - 9 2026-06-26
AAR132 Asiana Airlines 9 2026-06-26
AAR131 Asiana Airlines 9 2026-06-27
AAR104 - 9 2026-06-29
AAR745 - 8 2026-07-05
AAR739 - 8 2026-07-01
AAR354 - 8 2026-07-08
AAR352 Asiana Airlines 8 2026-06-17
AAR173 Asiana Airlines 8 2026-05-28
AAR103 - 8 2026-06-29
AAR740 - 7 2026-07-02
AAR367 - 7 2026-06-27
AAR351 - 7 2026-06-17
AAR347 - 7 2026-07-02
AAR171 - 7 2026-07-06
AAR116 - 7 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAR722 HKG → ICN Jul 14, 05:15 UTCJul 14, 08:35 UTC3h 20m
2026-07-14 AAR721 - Jul 14, 00:20 UTCJul 14, 03:25 UTC3h 5m
2026-07-09 AAR756 - Jul 9, 12:25 UTCJul 9, 20:20 UTC7h 55m
2026-07-09 AAR755 - Jul 9, 10:50 UTCJul 9, 11:25 UTC35m
2026-07-08 AAR354 - Jul 8, 21:35 UTCJul 8, 22:00 UTC25m
2026-07-08 AAR353 - Jul 8, 13:15 UTCJul 8, 20:50 UTC7h 35m
2026-07-08 AAR372D - Jul 8, 10:35 UTCJul 8, 11:20 UTC45m
2026-07-08 AAR372D - Jul 8, 08:20 UTCJul 8, 08:30 UTC10m
2026-07-07 AAR371 - Jul 7, 04:25 UTCJul 7, 05:05 UTC40m
2026-07-07 AAR371 - Jul 7, 01:35 UTCJul 7, 02:20 UTC45m
2026-07-06 AAR171 - Jul 6, 09:35 UTCJul 6, 11:20 UTC1h 45m
2026-07-06 AAR172 - Jul 6, 06:15 UTCJul 6, 08:00 UTC1h 45m
2026-07-06 AAR332 - Jul 6, 04:05 UTCJul 6, 04:30 UTC25m
2026-07-06 AAR332 - Jul 6, 03:05 UTCJul 6, 03:15 UTC10m
2026-07-05 AAR331 - Jul 5, 23:50 UTCJul 6, 00:05 UTC15m
2026-07-05 AAR746 HKG → ICN Jul 5, 18:00 UTCJul 5, 21:10 UTC3h 10m
2026-07-05 AAR745 - Jul 5, 12:15 UTCJul 5, 15:20 UTC3h 5m
2026-07-05 AAR133 - Jul 5, 07:50 UTCJul 5, 08:55 UTC1h 5m
2026-07-05 AAR134 - Jul 5, 05:10 UTCJul 5, 05:50 UTC40m
2026-07-05 AAR115 - Jul 5, 00:50 UTCJul 5, 02:20 UTC1h 30m
2026-07-04 AAR116 ICN → KIX Jul 4, 11:05 UTCJul 4, 12:25 UTC1h 20m
2026-07-04 AAR133 - Jul 4, 07:45 UTCJul 4, 08:45 UTC1h 0m
2026-07-04 AAR134 - Jul 4, 05:15 UTCJul 4, 06:05 UTC50m
2026-07-03 AAR746 - Jul 3, 18:30 UTCJul 3, 21:45 UTC3h 15m
2026-07-03 AAR745 ICN → HKG Jul 3, 12:00 UTCJul 3, 15:10 UTC3h 10m
2026-07-03 AAR340 - Jul 3, 08:40 UTCJul 3, 09:00 UTC20m
2026-07-03 AAR339 - Jul 3, 03:55 UTCJul 3, 04:20 UTC25m
2026-07-02 AAR740 ICN → ICN Jul 2, 10:05 UTCJul 2, 22:15 UTC12h 10m
2026-07-02 AAR348 - Jul 2, 07:40 UTCJul 2, 08:05 UTC25m
2026-07-02 AAR347 - Jul 2, 01:15 UTCJul 2, 01:35 UTC20m
2026-07-01 AAR739 ICN → ICN Jul 1, 10:10 UTCJul 1, 22:10 UTC12h 0m
2026-07-01 AAR121 - Jul 1, 03:15 UTCJul 1, 04:55 UTC1h 40m
2026-07-01 AAR122 - Jul 1, 00:35 UTCJul 1, 01:55 UTC1h 20m
2026-06-30 AAR755 ICN → ICN Jun 30, 10:25 UTCJun 30, 20:30 UTC10h 5m
2026-06-30 AAR722 HKG → ICN Jun 30, 05:20 UTCJun 30, 08:35 UTC3h 15m
2026-06-30 AAR721 - Jun 30, 00:25 UTCJun 30, 03:40 UTC3h 16m
2026-06-29 AAR103 - Jun 29, 07:59 UTCJun 29, 09:54 UTC1h 55m
2026-06-29 AAR104 ICN → NRT Jun 29, 03:39 UTCJun 29, 05:34 UTC1h 55m
2026-06-28 AAR746 HKG → ICN Jun 28, 18:05 UTCJun 28, 21:04 UTC3h 0m
2026-06-28 AAR745 - Jun 28, 14:50 UTCJun 28, 15:09 UTC20m
2026-06-28 AAR745 - Jun 28, 12:05 UTCJun 28, 14:19 UTC2h 15m
2026-06-28 AAR350 - Jun 28, 09:25 UTCJun 28, 10:00 UTC35m
2026-06-28 AAR349 - Jun 28, 04:20 UTCJun 28, 04:44 UTC25m
2026-06-27 AAR367 ICN → ICN Jun 27, 11:20 UTCJun 28, 02:29 UTC15h 10m
2026-06-27 AAR334 - Jun 27, 09:09 UTCJun 27, 09:29 UTC20m
2026-06-27 AAR333 - Jun 27, 04:24 UTCJun 27, 04:44 UTC20m
2026-06-27 AAR131 FUK → ICN Jun 27, 00:50 UTCJun 27, 01:44 UTC55m
2026-06-26 AAR132 ICN → FUK Jun 26, 21:50 UTCJun 26, 22:34 UTC45m
2026-06-26 AAR322 - Jun 26, 19:24 UTCJun 26, 19:45 UTC20m
2026-06-26 AAR321 - Jun 26, 12:34 UTCJun 26, 12:50 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 HL8584 page for operator, model, and routing details .

Mode-S 71C584 frequently asked

What is Mode-S code 71C584?
71C584 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8584.
Where is Mode-S 71C584 registered?
Mode-S code 71C584 is allocated to Korea, South (KR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 71C584 broadcasting right now?
No active broadcast right now. Last signal was 50m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C584, octal 34342604, decimal 7,456,132.
What flights does 71C584 operate?
Mode-S 71C584 has broadcast 20 distinct callsigns, including AAR332, AAR331, AAR336, AAR353, AAR335.