Apparatus

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sensors Mode-S transponder

71C510

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

Currently assigned to HL8510 · AIRBUS A-321neo

Hex
71C510
Octal
34342420
Decimal
7,456,016
Country
KR
Tail
HL8510
Type
A21N
No current signal · last broadcast 1d ago
Flights observed
361
Distinct callsigns
20
Country
KR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 71C510.

Country allocation

The ICAO 24-bit address 71C510 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
AAR172 - 27 2026-07-02
AAR171 - 26 2026-07-02
AAR327 - 19 2026-07-02
AAR328 - 14 2026-07-02
AAR721 - 13 2026-07-11
AAR106 Asiana Airlines 11 2026-05-17
AAR105 Asiana Airlines 11 2026-05-17
AAR722 - 10 2026-07-11
AAR354 - 10 2026-07-02
AAR353 - 10 2026-07-02
AAR303 - 10 2026-07-04
AAR707 - 9 2026-06-21
AAR708 - 8 2026-06-21
AAR352 - 7 2026-07-07
AAR351 - 7 2026-07-07
AAR152 - 7 2026-06-22
AAR151 - 7 2026-06-22
AAR739 - 6 2026-07-11
AAR332 Asiana Airlines 6 2026-06-07
AAR746 - 5 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAR336 - Jul 13, 10:10 UTCJul 13, 10:30 UTC20m
2026-07-13 AAR336 - Jul 13, 09:10 UTCJul 13, 09:20 UTC10m
2026-07-13 AAR335 - Jul 13, 06:10 UTCJul 13, 06:30 UTC20m
2026-07-13 AAR115 - Jul 13, 00:50 UTCJul 13, 02:10 UTC1h 20m
2026-07-12 AAR116 ICN → KIX Jul 12, 11:01 UTCJul 12, 12:25 UTC1h 25m
2026-07-12 AAR350 - Jul 12, 08:20 UTCJul 12, 08:45 UTC25m
2026-07-12 AAR349 - Jul 12, 03:45 UTCJul 12, 04:25 UTC40m
2026-07-11 AAR740 - Jul 11, 22:55 UTCJul 11, 23:10 UTC15m
2026-07-11 AAR739 - Jul 11, 14:55 UTCJul 11, 19:35 UTC4h 40m
2026-07-11 AAR739 - Jul 11, 11:25 UTCJul 11, 11:40 UTC15m
2026-07-11 AAR722 - Jul 11, 08:20 UTCJul 11, 08:50 UTC30m
2026-07-11 AAR722 - Jul 11, 05:40 UTCJul 11, 06:01 UTC20m
2026-07-11 AAR721 - Jul 11, 00:45 UTCJul 11, 04:01 UTC3h 15m
2026-07-10 AAR324 - Jul 10, 19:25 UTCJul 10, 19:50 UTC25m
2026-07-10 AAR323 - Jul 10, 11:25 UTCJul 10, 11:50 UTC25m
2026-07-10 AAR348 - Jul 10, 07:50 UTCJul 10, 08:15 UTC25m
2026-07-10 AAR347 - Jul 10, 01:05 UTCJul 10, 06:55 UTC5h 50m
2026-07-09 AAR378 - Jul 9, 13:40 UTCJul 9, 14:00 UTC20m
2026-07-09 AAR377 - Jul 9, 10:30 UTCJul 9, 10:50 UTC20m
2026-07-09 AAR348 - Jul 9, 07:45 UTCJul 9, 08:10 UTC25m
2026-07-09 AAR347 - Jul 9, 01:15 UTCJul 9, 02:40 UTC1h 25m
2026-07-08 AAR735 ICN → ICN Jul 8, 11:10 UTCJul 8, 23:05 UTC11h 55m
2026-07-07 AAR352 - Jul 7, 11:25 UTCJul 7, 11:50 UTC25m
2026-07-07 AAR351 - Jul 7, 06:35 UTCJul 7, 07:00 UTC25m
2026-07-07 AAR121 - Jul 7, 03:10 UTCJul 7, 04:45 UTC1h 35m
2026-07-07 AAR122 - Jul 7, 00:30 UTCJul 7, 01:50 UTC1h 20m
2026-07-06 AAR368 ICN → ICN Jul 6, 11:50 UTCJul 6, 19:05 UTC7h 15m
2026-07-06 AAR350 - Jul 6, 09:40 UTCJul 6, 10:05 UTC25m
2026-07-06 AAR349 - Jul 6, 04:45 UTCJul 6, 05:25 UTC40m
2026-07-05 AAR756 ICN → ICN Jul 5, 10:15 UTCJul 5, 20:20 UTC10h 5m
2026-07-05 AAR722 HKG → ICN Jul 5, 05:20 UTCJul 5, 08:35 UTC3h 15m
2026-07-05 AAR721 - Jul 5, 03:40 UTCJul 5, 03:55 UTC15m
2026-07-05 AAR721 - Jul 5, 00:50 UTCJul 5, 03:05 UTC2h 15m
2026-07-04 AAR113 - Jul 4, 11:20 UTCJul 4, 12:45 UTC1h 25m
2026-07-04 AAR114 ICN → KIX Jul 4, 08:15 UTCJul 4, 09:35 UTC1h 20m
2026-07-04 AAR304 - Jul 4, 05:35 UTCJul 4, 05:55 UTC20m
2026-07-04 AAR303 - Jul 4, 00:30 UTCJul 4, 00:55 UTC25m
2026-07-03 AAR352 - Jul 3, 12:05 UTCJul 3, 12:25 UTC20m
2026-07-03 AAR351 - Jul 3, 06:40 UTCJul 3, 07:05 UTC25m
2026-07-03 AAR121 - Jul 3, 03:15 UTCJul 3, 04:45 UTC1h 30m
2026-07-03 AAR122 - Jul 3, 00:30 UTCJul 3, 01:45 UTC1h 15m
2026-07-02 AAR354 - Jul 2, 20:55 UTCJul 2, 21:25 UTC30m
2026-07-02 AAR353 - Jul 2, 13:25 UTCJul 2, 20:10 UTC6h 45m
2026-07-02 AAR171 - Jul 2, 10:30 UTCJul 2, 11:10 UTC40m
2026-07-02 AAR171 - Jul 2, 09:25 UTCJul 2, 09:35 UTC10m
2026-07-02 AAR172 - Jul 2, 07:35 UTCJul 2, 07:55 UTC20m
2026-07-02 AAR172 - Jul 2, 06:15 UTCJul 2, 06:45 UTC30m
2026-07-02 AAR328 - Jul 2, 04:15 UTCJul 2, 04:40 UTC25m
2026-07-02 AAR327 - Jul 2, 00:25 UTCJul 2, 00:50 UTC25m
2026-07-01 AAR368 ICN → ICN Jul 1, 11:30 UTCJul 1, 18:55 UTC7h 25m

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 HL8510 page for operator, model, and routing details .

Mode-S 71C510 frequently asked

What is Mode-S code 71C510?
71C510 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8510.
Where is Mode-S 71C510 registered?
Mode-S code 71C510 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 71C510 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C510, octal 34342420, decimal 7,456,016.
What flights does 71C510 operate?
Mode-S 71C510 has broadcast 20 distinct callsigns, including AAR172, AAR171, AAR327, AAR328, AAR721.