Apparatus

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sensors Mode-S transponder

71C371

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

Currently assigned to HL8371 · AIRBUS A-321neo

Hex
71C371
Octal
34341561
Decimal
7,455,601
Country
KR
Tail
HL8371
Type
A21N
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
447
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S 71C371.

Country allocation

The ICAO 24-bit address 71C371 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
AAR336 - 22 2026-07-04
AAR335 - 15 2026-07-04
AAR332 - 15 2026-07-04
AAR304 Asiana Airlines 14 2026-07-24
AAR303 - 13 2026-07-06
AAR745 Asiana Airlines 12 2026-07-21
AAR331 - 12 2026-07-03
AAR172 Asiana Airlines 12 2026-07-23
AAR353 - 11 2026-07-05
AAR354 - 10 2026-07-05
AAR327 - 10 2026-07-05
AAR105 Asiana Airlines 10 2026-07-24
AAR708 Asiana Airlines 9 2026-07-23
AAR349 - 9 2026-07-11
AAR328 - 9 2026-07-05
AAR171 Asiana Airlines 9 2026-07-23
AAR746 - 8 2026-07-21
AAR707 Asiana Airlines 8 2026-07-23
AAR350 Asiana Airlines 8 2026-07-26
AAR322 Asiana Airlines 8 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR735 ICN → SGN Jul 26, 11:30 UTCJul 26, 21:40 UTC10h 10m
2026-07-26 AAR350 NKG → ICN Jul 26, 04:00 UTCJul 26, 09:10 UTC5h 11m
2026-07-25 AAR736 SGN → ICN Jul 25, 23:15 UTCJul 25, 23:45 UTC30m
2026-07-25 AAR735 ICN → SGN Jul 25, 11:25 UTCJul 25, 20:25 UTC9h 0m
2026-07-25 AAR372 SZX → ICN Jul 25, 08:50 UTCJul 25, 09:35 UTC45m
2026-07-25 AAR371 ICN → SZX Jul 25, 04:35 UTCJul 25, 04:50 UTC15m
2026-07-25 AAR371 ICN → SZX Jul 25, 01:40 UTCJul 25, 02:20 UTC40m
2026-07-24 AAR105 NRT → ICN Jul 24, 11:10 UTCJul 24, 13:20 UTC2h 10m
2026-07-24 AAR106 ICN → NRT Jul 24, 07:45 UTCJul 24, 09:45 UTC2h 0m
2026-07-24 AAR304 CGQ → ICN Jul 24, 00:50 UTCJul 24, 05:25 UTC4h 35m
2026-07-23 AAR708 CRK → ICN Jul 23, 18:00 UTCJul 23, 21:50 UTC3h 50m
2026-07-23 AAR707 ICN → CRK Jul 23, 13:20 UTCJul 23, 16:40 UTC3h 20m
2026-07-23 AAR171 OKA → ICN Jul 23, 09:45 UTCJul 23, 11:30 UTC1h 45m
2026-07-23 AAR172 ICN → OKA Jul 23, 06:30 UTCJul 23, 08:20 UTC1h 50m
2026-07-23 AAR111 KIX → ICN Jul 23, 01:50 UTCJul 23, 03:15 UTC1h 25m
2026-07-22 AAR112 ICN → KIX Jul 22, 22:15 UTCJul 22, 23:40 UTC1h 25m
2026-07-22 AAR352 YNJ → ICN Jul 22, 11:45 UTCJul 22, 12:10 UTC25m
2026-07-22 AAR121 NGO → ICN Jul 22, 03:30 UTCJul 22, 05:05 UTC1h 35m
2026-07-22 AAR122 ICN → NGO Jul 22, 00:50 UTCJul 22, 02:10 UTC1h 20m
2026-07-21 AAR746 - Jul 21, 18:00 UTCJul 21, 21:05 UTC3h 5m
2026-07-21 AAR745 ICN → HKG Jul 21, 12:25 UTCJul 21, 15:40 UTC3h 15m
2026-07-21 AAR744 BKK → ICN Jul 21, 05:15 UTCJul 21, 10:30 UTC5h 15m
2026-07-20 AAR743 - Jul 20, 22:20 UTCJul 21, 03:35 UTC5h 14m
2026-07-20 AAR322 CSX → ICN Jul 20, 19:00 UTCJul 20, 19:25 UTC25m
2026-07-20 AAR321 ICN → CSX Jul 20, 12:30 UTCJul 20, 12:55 UTC25m
2026-07-20 AAR730 - Jul 20, 06:55 UTCJul 20, 11:05 UTC4h 10m
2026-07-20 AAR729 PUS → SGN Jul 20, 01:00 UTCJul 20, 01:50 UTC50m
2026-07-19 AAR746 HKG → ICN Jul 19, 17:55 UTCJul 19, 21:05 UTC3h 10m
2026-07-19 AAR745 ICN → HKG Jul 19, 12:20 UTCJul 19, 15:30 UTC3h 10m
2026-07-19 AAR744 BKK → ICN Jul 19, 07:40 UTCJul 19, 10:25 UTC2h 45m
2026-07-19 AAR744 BKK → ICN Jul 19, 05:15 UTCJul 19, 05:30 UTC15m
2026-07-19 AAR743 - Jul 19, 03:15 UTCJul 19, 03:30 UTC15m
2026-07-18 AAR743 - Jul 18, 22:30 UTCJul 19, 01:15 UTC2h 45m
2026-07-18 AAR105 NRT → ICN Jul 18, 11:05 UTCJul 18, 12:55 UTC1h 50m
2026-07-18 AAR106 ICN → NRT Jul 18, 07:05 UTCJul 18, 09:00 UTC1h 55m
2026-07-18 AAR121 - Jul 18, 03:25 UTCJul 18, 04:50 UTC1h 25m
2026-07-18 AAR122 ICN → NGO Jul 18, 00:39 UTCJul 18, 02:00 UTC1h 20m
2026-07-17 AAR730 - Jul 17, 06:45 UTCJul 17, 10:40 UTC3h 55m
2026-07-17 AAR729 PUS → SGN Jul 17, 01:05 UTCJul 17, 01:39 UTC35m
2026-07-16 AAR746 HKG → ICN Jul 16, 17:54 UTCJul 16, 21:05 UTC3h 10m
2026-07-16 AAR745 ICN → HKG Jul 16, 13:05 UTCJul 16, 16:09 UTC3h 5m
2026-07-16 AAR730 - Jul 16, 10:15 UTCJul 16, 10:59 UTC45m
2026-07-16 AAR730 - Jul 16, 07:00 UTCJul 16, 07:10 UTC10m
2026-07-16 AAR729 - Jul 16, 00:55 UTCJul 16, 03:35 UTC2h 40m
2026-07-15 AAR322 - Jul 15, 19:10 UTCJul 15, 19:35 UTC25m
2026-07-15 AAR321 - Jul 15, 12:40 UTCJul 15, 13:05 UTC25m
2026-07-15 AAR730 - Jul 15, 07:00 UTCJul 15, 10:55 UTC3h 55m
2026-07-15 AAR729 - Jul 15, 00:45 UTCJul 15, 01:30 UTC45m
2026-07-14 AAR352 - Jul 14, 11:35 UTCJul 14, 12:55 UTC1h 20m
2026-07-14 AAR351 - Jul 14, 06:45 UTCJul 14, 07:10 UTC25m

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 HL8371 page for operator, model, and routing details .

Mode-S 71C371 frequently asked

What is Mode-S code 71C371?
71C371 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8371.
Where is Mode-S 71C371 registered?
Mode-S code 71C371 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 71C371 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 71C371, octal 34341561, decimal 7,455,601.
What flights does 71C371 operate?
Mode-S 71C371 has broadcast 20 distinct callsigns, including AAR336, AAR335, AAR332, AAR304, AAR303.