Apparatus

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sensors Mode-S transponder

71C705

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

Currently assigned to HL8705 · AIRBUS A-321neo

Hex
71C705
Octal
34343405
Decimal
7,456,517
Country
KR
Tail
HL8705
Type
A21N
Broadcasting now · callsign AAR134 · 20,025 ft
Flights observed
418
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 20:05 UTC

Current position

71C705 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C705 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 Asiana Airlines 22 2026-07-22
AAR331 Asiana Airlines 15 2026-07-21
AAR739 Asiana Airlines 13 2026-07-24
AAR324 Asiana Airlines 13 2026-07-26
AAR740 Asiana Airlines 12 2026-07-24
AAR350 Asiana Airlines 12 2026-07-25
AAR349 Asiana Airlines 11 2026-07-25
AAR172 Asiana Airlines 11 2026-07-19
AAR347 - 10 2026-06-29
AAR336 - 10 2026-07-16
AAR304 - 10 2026-07-17
AAR303 Asiana Airlines 10 2026-07-17
AAR171 Asiana Airlines 10 2026-07-22
AAR708 - 9 2026-07-19
AAR707 Asiana Airlines 9 2026-07-19
AAR339 - 9 2026-07-14
AAR323 Asiana Airlines 9 2026-07-26
AAR348 - 8 2026-06-29
AAR335 - 8 2026-07-16
AAR151 - 8 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR324 TFU → ICN Jul 26, 18:40 UTCJul 26, 20:00 UTC1h 20m
2026-07-26 AAR323 ICN → TFU Jul 26, 11:20 UTCJul 26, 11:45 UTC25m
2026-07-26 AAR133 FUK → ICN Jul 26, 07:45 UTCJul 26, 08:45 UTC1h 0m
2026-07-26 AAR134 ICN → FUK Jul 26, 05:20 UTCJul 26, 06:00 UTC40m
2026-07-26 AAR115 KIX → ICN Jul 26, 01:00 UTCJul 26, 02:30 UTC1h 30m
2026-07-25 AAR116 ICN → KIX Jul 25, 11:00 UTCJul 25, 12:15 UTC1h 15m
2026-07-25 AAR350 NKG → ICN Jul 25, 08:25 UTCJul 25, 09:05 UTC40m
2026-07-25 AAR349 ICN → NKG Jul 25, 04:10 UTCJul 25, 04:50 UTC40m
2026-07-24 AAR740 PNH → ICN Jul 24, 22:05 UTCJul 24, 22:35 UTC30m
2026-07-24 AAR739 ICN → PNH Jul 24, 10:45 UTCJul 24, 19:15 UTC8h 30m
2026-07-24 AAR722 HKG → ICN Jul 24, 05:30 UTCJul 24, 08:45 UTC3h 15m
2026-07-24 AAR721 ICN → HKG Jul 24, 00:35 UTCJul 24, 03:50 UTC3h 15m
2026-07-23 AAR113 KIX → ICN Jul 23, 11:05 UTCJul 23, 12:30 UTC1h 25m
2026-07-23 AAR114 ICN → KIX Jul 23, 08:00 UTCJul 23, 09:30 UTC1h 30m
2026-07-23 AAR328 TSN → ICN Jul 23, 04:25 UTCJul 23, 04:45 UTC20m
2026-07-23 AAR327 ICN → TSN Jul 23, 00:30 UTCJul 23, 00:55 UTC25m
2026-07-22 AAR171 OKA → ICN Jul 22, 11:15 UTCJul 22, 12:20 UTC1h 5m
2026-07-22 AAR332 PEK → ICN Jul 22, 04:40 UTCJul 22, 05:00 UTC20m
2026-07-22 AAR332 PEK → ICN Jul 22, 03:20 UTCJul 22, 03:30 UTC10m
2026-07-21 AAR331 ICN → PEK Jul 21, 23:55 UTCJul 22, 00:20 UTC25m
2026-07-21 AAR324 - Jul 21, 11:35 UTCJul 21, 19:50 UTC8h 15m
2026-07-21 AAR372 - Jul 21, 09:00 UTCJul 21, 09:40 UTC40m
2026-07-21 AAR371 ICN → SZX Jul 21, 04:50 UTCJul 21, 05:00 UTC10m
2026-07-21 AAR371 ICN → SZX Jul 21, 01:35 UTCJul 21, 02:20 UTC45m
2026-07-20 AAR352 YNJ → ICN Jul 20, 11:40 UTCJul 20, 12:05 UTC25m
2026-07-20 AAR351 ICN → YNJ Jul 20, 06:55 UTCJul 20, 07:30 UTC35m
2026-07-20 AAR332 PEK → ICN Jul 20, 04:05 UTCJul 20, 04:30 UTC25m
2026-07-20 AAR332 PEK → ICN Jul 20, 03:00 UTCJul 20, 03:15 UTC15m
2026-07-19 AAR331 - Jul 19, 23:45 UTCJul 20, 00:10 UTC25m
2026-07-19 AAR708 - Jul 19, 18:10 UTCJul 19, 21:35 UTC3h 25m
2026-07-19 AAR707 ICN → CRK Jul 19, 13:15 UTCJul 19, 16:45 UTC3h 30m
2026-07-19 AAR171 - Jul 19, 09:45 UTCJul 19, 11:20 UTC1h 35m
2026-07-19 AAR172 ICN → OKA Jul 19, 07:50 UTCJul 19, 08:00 UTC10m
2026-07-19 AAR172 ICN → OKA Jul 19, 06:15 UTCJul 19, 06:50 UTC35m
2026-07-19 AAR328 - Jul 19, 04:05 UTCJul 19, 04:30 UTC25m
2026-07-19 AAR327 ICN → TSN Jul 19, 00:15 UTCJul 19, 00:45 UTC30m
2026-07-18 AAR324 - Jul 18, 11:35 UTCJul 18, 19:55 UTC8h 20m
2026-07-18 AAR370 - Jul 18, 09:00 UTCJul 18, 09:40 UTC40m
2026-07-18 AAR369 - Jul 18, 01:05 UTCJul 18, 01:34 UTC30m
2026-07-17 AAR105 - Jul 17, 11:00 UTCJul 17, 12:55 UTC1h 55m
2026-07-17 AAR106 ICN → NRT Jul 17, 07:00 UTCJul 17, 08:59 UTC2h 0m
2026-07-17 AAR304 - Jul 17, 04:59 UTCJul 17, 05:25 UTC25m
2026-07-17 AAR303 ICN → CGQ Jul 17, 00:40 UTCJul 17, 01:15 UTC35m
2026-07-16 AAR322 - Jul 16, 18:59 UTCJul 16, 19:30 UTC30m
2026-07-16 AAR321 - Jul 16, 12:34 UTCJul 16, 13:00 UTC25m
2026-07-16 AAR336 - Jul 16, 10:29 UTCJul 16, 10:55 UTC25m
2026-07-16 AAR335 - Jul 16, 06:15 UTCJul 16, 06:35 UTC20m
2026-07-16 AAR332 - Jul 16, 04:05 UTCJul 16, 04:25 UTC20m
2026-07-16 AAR332 - Jul 16, 02:55 UTCJul 16, 03:05 UTC10m
2026-07-15 AAR331 - Jul 15, 23:45 UTCJul 16, 00:15 UTC30m

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 HL8705 page for operator, model, and routing details .

Mode-S 71C705 frequently asked

What is Mode-S code 71C705?
71C705 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8705.
Where is Mode-S 71C705 registered?
Mode-S code 71C705 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 71C705 broadcasting right now?
Yes. Mode-S 71C705 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C705, octal 34343405, decimal 7,456,517.
What flights does 71C705 operate?
Mode-S 71C705 has broadcast 20 distinct callsigns, including AAR332, AAR331, AAR739, AAR324, AAR740.