Apparatus

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sensors Mode-S transponder

71C511

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

Currently assigned to HL8511 · AIRBUS A-321neo

Hex
71C511
Octal
34342421
Decimal
7,456,017
Country
KR
Tail
HL8511
Type
A21N
Transponder active on ground
Flights observed
327
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 12:15 UTC

Last known position

Most recent position reported by Mode-S 71C511.

Country allocation

The ICAO 24-bit address 71C511 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
AAR103 Asiana Airlines 14 2026-05-19
AAR372 - 12 2026-06-22
AAR371 - 12 2026-06-22
AAR104 Asiana Airlines 12 2026-05-19
AAR739 - 10 2026-07-10
AAR721 - 8 2026-07-09
AAR336 - 8 2026-07-20
AAR324 - 8 2026-07-11
AAR323 - 8 2026-07-11
AAR152 - 8 2026-06-30
AAR151 - 8 2026-06-30
AAR722 - 7 2026-07-09
AAR368 - 7 2026-07-09
AAR339 Asiana Airlines 7 2026-07-26
AAR335 - 7 2026-07-20
AAR334 Asiana Airlines 7 2026-06-05
AAR174 - 7 2026-06-29
AAR173 - 7 2026-06-29
AAR340 Asiana Airlines 6 2026-07-26
AAR333 Asiana Airlines 6 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR116 ICN → KIX Jul 26, 10:55 UTCJul 26, 12:15 UTC1h 20m
2026-07-26 AAR340 HRB → ICN Jul 26, 08:00 UTCJul 26, 08:45 UTC45m
2026-07-26 AAR339 ICN → HRB Jul 26, 03:40 UTCJul 26, 04:15 UTC35m
2026-07-25 AAR352 YNJ → ICN Jul 25, 11:10 UTCJul 25, 11:35 UTC25m
2026-07-25 AAR351 ICN → YNJ Jul 25, 06:40 UTCJul 25, 07:15 UTC35m
2026-07-25 AAR338 - Jul 25, 04:25 UTCJul 25, 05:00 UTC35m
2026-07-25 AAR337 - Jul 25, 01:10 UTCJul 25, 01:50 UTC40m
2026-07-24 AAR746 HKG → ICN Jul 24, 17:50 UTCJul 24, 21:05 UTC3h 15m
2026-07-24 AAR745 ICN → HKG Jul 24, 12:10 UTCJul 24, 15:15 UTC3h 5m
2026-07-24 AAR348 XIY → ICN Jul 24, 07:45 UTCJul 24, 08:05 UTC20m
2026-07-24 AAR348 XIY → ICN Jul 24, 01:25 UTCJul 24, 06:55 UTC5h 30m
2026-07-23 AAR740 PNH → ICN Jul 23, 10:15 UTCJul 23, 21:35 UTC11h 20m
2026-07-23 AAR1031 - Jul 23, 04:15 UTCJul 23, 06:15 UTC2h 0m
2026-07-23 AAR1041 - Jul 23, 00:45 UTCJul 23, 02:40 UTC1h 55m
2026-07-22 AAR105 NRT → ICN Jul 22, 11:15 UTCJul 22, 13:15 UTC2h 0m
2026-07-22 AAR303 ICN → CGQ Jul 22, 00:40 UTCJul 22, 01:10 UTC30m
2026-07-21 AAR123 - Jul 21, 10:15 UTCJul 21, 11:40 UTC1h 25m
2026-07-21 AAR124 - Jul 21, 07:30 UTCJul 21, 08:50 UTC1h 20m
2026-07-21 AAR338 - Jul 21, 01:10 UTCJul 21, 05:10 UTC4h 0m
2026-07-20 AAR336 - Jul 20, 11:15 UTCJul 20, 11:40 UTC25m
2026-07-20 AAR335 - Jul 20, 06:10 UTCJul 20, 06:40 UTC30m
2026-07-18 AAR708 - Jul 18, 21:25 UTCJul 18, 22:20 UTC55m
2026-07-18 AAR708 - Jul 18, 18:40 UTCJul 18, 20:35 UTC1h 55m
2026-07-18 AAR707 - Jul 18, 13:30 UTCJul 18, 16:50 UTC3h 20m
2026-07-18 AAR336 - Jul 18, 10:25 UTCJul 18, 10:45 UTC20m
2026-07-18 AAR335 - Jul 18, 06:05 UTCJul 18, 06:30 UTC25m
2026-07-18 AAR115 KIX → ICN Jul 18, 00:55 UTCJul 18, 02:14 UTC1h 20m
2026-07-17 AAR116 ICN → KIX Jul 17, 11:00 UTCJul 17, 12:35 UTC1h 35m
2026-07-17 AAR370 - Jul 17, 07:20 UTCJul 17, 08:04 UTC45m
2026-07-17 AAR369 - Jul 17, 00:20 UTCJul 17, 01:05 UTC45m
2026-07-16 AAR115 KIX → ICN Jul 16, 00:50 UTCJul 16, 02:10 UTC1h 20m
2026-07-15 AAR116 ICN → KIX Jul 15, 11:00 UTCJul 15, 12:25 UTC1h 25m
2026-07-15 AAR349 ICN → ICN Jul 15, 04:30 UTCJul 15, 09:20 UTC4h 50m
2026-07-14 AAR354 - Jul 14, 21:15 UTCJul 14, 21:35 UTC20m
2026-07-14 AAR353 - Jul 14, 13:50 UTCJul 14, 20:25 UTC6h 35m
2026-07-14 AAR171 - Jul 14, 09:40 UTCJul 14, 11:30 UTC1h 50m
2026-07-14 AAR172 - Jul 14, 07:30 UTCJul 14, 07:50 UTC20m
2026-07-14 AAR172 - Jul 14, 06:10 UTCJul 14, 06:45 UTC35m
2026-07-13 AAR322 - Jul 13, 19:20 UTCJul 13, 19:40 UTC20m
2026-07-13 AAR321 - Jul 13, 12:45 UTCJul 13, 13:05 UTC20m
2026-07-13 AAR730 - Jul 13, 10:25 UTCJul 13, 11:10 UTC45m
2026-07-13 AAR730 - Jul 13, 07:10 UTCJul 13, 07:20 UTC10m
2026-07-13 AAR729 - Jul 13, 00:55 UTCJul 13, 01:40 UTC45m
2026-07-12 AAR322 - Jul 12, 19:05 UTCJul 12, 19:25 UTC20m
2026-07-12 AAR321 - Jul 12, 12:35 UTCJul 12, 12:55 UTC20m
2026-07-12 AAR133 - Jul 12, 07:40 UTCJul 12, 08:35 UTC55m
2026-07-12 AAR134 - Jul 12, 05:15 UTCJul 12, 06:01 UTC45m
2026-07-12 AAR111 KIX → ICN Jul 12, 01:50 UTCJul 12, 03:10 UTC1h 20m
2026-07-11 AAR112 ICN → KIX Jul 11, 22:10 UTCJul 11, 23:30 UTC1h 20m
2026-07-11 AAR324 - Jul 11, 19:35 UTCJul 11, 19:50 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 HL8511 page for operator, model, and routing details .

Mode-S 71C511 frequently asked

What is Mode-S code 71C511?
71C511 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8511.
Where is Mode-S 71C511 registered?
Mode-S code 71C511 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 71C511 broadcasting right now?
Mode-S 71C511 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C511, octal 34342421, decimal 7,456,017.
What flights does 71C511 operate?
Mode-S 71C511 has broadcast 20 distinct callsigns, including AAR103, AAR372, AAR371, AAR104, AAR739.