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 Jul 26, 21:40 UTC
Flights observed
402
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:40 UTC

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
AAR739 Asiana Airlines 12 2026-07-26
AAR353 Asiana Airlines 11 2026-07-24
AAR336 - 11 2026-06-26
AAR354 Asiana Airlines 10 2026-07-24
AAR347 Asiana Airlines 10 2026-07-26
AAR352 - 9 2026-07-17
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
AAR367 - 8 2026-07-20
AAR351 - 8 2026-07-17
AAR348 - 8 2026-07-19
AAR173 Asiana Airlines 8 2026-05-28
AAR172 Asiana Airlines 8 2026-07-24
AAR171 Asiana Airlines 8 2026-07-24
AAR103 - 8 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR739 ICN → PNH Jul 26, 10:10 UTCJul 26, 21:40 UTC11h 30m
2026-07-26 AAR347 ICN → XIY Jul 26, 01:15 UTCJul 26, 08:05 UTC6h 51m
2026-07-25 AAR324 TFU → ICN Jul 25, 19:35 UTCJul 25, 20:00 UTC25m
2026-07-25 AAR323 ICN → TFU Jul 25, 11:35 UTCJul 25, 18:45 UTC7h 10m
2026-07-25 AAR340 HRB → ICN Jul 25, 08:15 UTCJul 25, 08:40 UTC25m
2026-07-25 AAR339 ICN → HRB Jul 25, 03:35 UTCJul 25, 04:15 UTC40m
2026-07-24 AAR354 CKG → ICN Jul 24, 14:30 UTCJul 24, 21:50 UTC7h 20m
2026-07-24 AAR353 ICN → CKG Jul 24, 13:20 UTCJul 24, 13:50 UTC30m
2026-07-24 AAR171 OKA → ICN Jul 24, 09:35 UTCJul 24, 11:25 UTC1h 50m
2026-07-24 AAR172 ICN → OKA Jul 24, 07:35 UTCJul 24, 07:55 UTC20m
2026-07-24 AAR172 ICN → OKA Jul 24, 06:15 UTCJul 24, 06:50 UTC35m
2026-07-24 AAR328 TSN → ICN Jul 24, 04:15 UTCJul 24, 04:30 UTC15m
2026-07-24 AAR327 ICN → TSN Jul 24, 00:25 UTCJul 24, 00:50 UTC25m
2026-07-23 AAR730 SGN → PUS Jul 23, 10:00 UTCJul 23, 10:45 UTC45m
2026-07-23 AAR730 SGN → PUS Jul 23, 06:45 UTCJul 23, 06:55 UTC10m
2026-07-23 AAR729 PUS → SGN Jul 23, 00:50 UTCJul 23, 01:30 UTC40m
2026-07-22 AAR756 DAD → ICN Jul 22, 11:55 UTCJul 22, 20:20 UTC8h 25m
2026-07-22 AAR151 SDJ → ICN Jul 22, 04:20 UTCJul 22, 05:15 UTC55m
2026-07-22 AAR152 ICN → SDJ Jul 22, 01:00 UTCJul 22, 02:40 UTC1h 40m
2026-07-21 AAR368 PVG → ICN Jul 21, 11:30 UTCJul 21, 19:45 UTC8h 15m
2026-07-21 AAR340 HRB → ICN Jul 21, 08:30 UTCJul 21, 08:55 UTC25m
2026-07-21 AAR339 ICN → HRB Jul 21, 03:45 UTCJul 21, 04:10 UTC25m
2026-07-20 AAR368 PVG → ICN Jul 20, 18:25 UTCJul 20, 19:00 UTC35m
2026-07-20 AAR367 - Jul 20, 11:35 UTCJul 20, 12:15 UTC40m
2026-07-20 AAR350 ICN → ICN Jul 20, 04:00 UTCJul 20, 09:05 UTC5h 5m
2026-07-19 AAR739 ICN → ICN Jul 19, 10:15 UTCJul 19, 21:40 UTC11h 25m
2026-07-19 AAR348 - Jul 19, 07:50 UTCJul 19, 08:15 UTC25m
2026-07-19 AAR347 - Jul 19, 01:20 UTCJul 19, 06:55 UTC5h 35m
2026-07-18 AAR739 ICN → ICN Jul 18, 10:20 UTCJul 18, 21:55 UTC11h 35m
2026-07-18 AAR722 HKG → ICN Jul 18, 05:20 UTCJul 18, 08:40 UTC3h 20m
2026-07-18 AAR721 ICN → HKG Jul 18, 00:35 UTCJul 18, 03:40 UTC3h 6m
2026-07-17 AAR352 - Jul 17, 11:35 UTCJul 17, 12:00 UTC25m
2026-07-17 AAR351 - Jul 17, 06:40 UTCJul 17, 07:40 UTC1h 0m
2026-07-17 AAR157 - Jul 17, 04:14 UTCJul 17, 05:15 UTC1h 0m
2026-07-17 AAR158 - Jul 17, 01:05 UTCJul 17, 02:05 UTC1h 0m
2026-07-16 AAR756 DAD → ICN Jul 16, 10:20 UTCJul 16, 20:25 UTC10h 5m
2026-07-16 AAR348 - Jul 16, 07:30 UTCJul 16, 07:55 UTC25m
2026-07-16 AAR347 - Jul 16, 01:25 UTCJul 16, 06:45 UTC5h 20m
2026-07-15 AAR354 - Jul 15, 20:00 UTCJul 15, 21:10 UTC1h 10m
2026-07-15 AAR353 - Jul 15, 13:20 UTCJul 15, 13:50 UTC30m
2026-07-15 AAR380 ICN → ICN Jul 15, 07:05 UTCJul 15, 11:35 UTC4h 30m
2026-07-15 AAR328 - Jul 15, 04:05 UTCJul 15, 04:25 UTC20m
2026-07-15 AAR327 - Jul 15, 00:25 UTCJul 15, 00:40 UTC15m
2026-07-14 AAR739 ICN → ICN Jul 14, 10:35 UTCJul 14, 21:50 UTC11h 15m
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

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 Jul 26, 21:40 UTC.
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, AAR739, AAR353, AAR336.