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
No current signal · last broadcast 1h ago
Flights observed
290
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

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
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
AAR334 Asiana Airlines 7 2026-06-05
AAR174 - 7 2026-06-29
AAR173 - 7 2026-06-29
AAR339 - 6 2026-07-11
AAR336 - 6 2026-07-03
AAR333 Asiana Airlines 6 2026-06-05
AAR322 - 6 2026-07-13
AAR340 - 5 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAR172 - Jul 14, 06:10 UTCJul 14, 06:15 UTC5m
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
2026-07-11 AAR323 - Jul 11, 11:20 UTCJul 11, 11:35 UTC15m
2026-07-11 AAR340 - Jul 11, 08:20 UTCJul 11, 08:40 UTC20m
2026-07-11 AAR339 - Jul 11, 03:45 UTCJul 11, 04:40 UTC55m
2026-07-10 AAR740 - Jul 10, 22:05 UTCJul 10, 22:25 UTC20m
2026-07-10 AAR739 - Jul 10, 10:25 UTCJul 10, 18:50 UTC8h 25m
2026-07-10 AAR328 - Jul 10, 04:05 UTCJul 10, 04:25 UTC20m
2026-07-10 AAR327 - Jul 10, 00:15 UTCJul 10, 00:35 UTC20m
2026-07-09 AAR368 - Jul 9, 11:40 UTCJul 9, 19:00 UTC7h 20m
2026-07-09 AAR722 HKG → ICN Jul 9, 05:35 UTCJul 9, 08:45 UTC3h 10m
2026-07-09 AAR721 ICN → HKG Jul 9, 00:40 UTCJul 9, 03:45 UTC3h 5m
2026-07-08 AAR755 ICN → ICN Jul 8, 10:15 UTCJul 8, 20:30 UTC10h 15m
2026-07-07 AAR324 - Jul 7, 20:15 UTCJul 7, 20:35 UTC20m
2026-07-07 AAR323 - Jul 7, 12:30 UTCJul 7, 12:50 UTC20m
2026-07-07 AAR133 - Jul 7, 07:40 UTCJul 7, 08:40 UTC1h 0m
2026-07-07 AAR134 - Jul 7, 05:15 UTCJul 7, 05:55 UTC40m
2026-07-07 AAR115 - Jul 7, 00:55 UTCJul 7, 02:20 UTC1h 25m
2026-07-06 AAR116 - Jul 6, 10:50 UTCJul 6, 12:10 UTC1h 20m
2026-07-05 AAR349 - Jul 5, 04:15 UTCJul 5, 08:55 UTC4h 40m
2026-07-04 AAR352 - Jul 4, 11:20 UTCJul 4, 11:45 UTC25m
2026-07-04 AAR351 - Jul 4, 06:45 UTCJul 4, 07:05 UTC20m
2026-07-04 AAR121 - Jul 4, 03:15 UTCJul 4, 04:50 UTC1h 35m
2026-07-04 AAR122 - Jul 4, 00:30 UTCJul 4, 01:50 UTC1h 20m
2026-07-03 AAR354 - Jul 3, 21:10 UTCJul 3, 21:30 UTC20m
2026-07-03 AAR353 - Jul 3, 13:15 UTCJul 3, 20:20 UTC7h 5m
2026-07-03 AAR336 - Jul 3, 10:45 UTCJul 3, 11:10 UTC25m
2026-07-03 AAR335 - Jul 3, 06:20 UTCJul 3, 06:35 UTC15m
2026-07-02 AAR324 - Jul 2, 19:25 UTCJul 2, 19:45 UTC20m
2026-07-02 AAR323 - Jul 2, 11:25 UTCJul 2, 18:35 UTC7h 10m
2026-07-02 AAR722 HKG → ICN Jul 2, 05:20 UTCJul 2, 08:30 UTC3h 10m
2026-07-02 AAR721 - Jul 2, 03:25 UTCJul 2, 03:40 UTC15m
2026-07-02 AAR721 - Jul 2, 00:35 UTCJul 2, 02:50 UTC2h 15m
2026-07-01 AAR340 - Jul 1, 11:55 UTCJul 1, 12:20 UTC25m
2026-07-01 AAR339 - Jul 1, 03:40 UTCJul 1, 04:05 UTC25m
2026-06-30 AAR739 ICN → ICN Jun 30, 10:20 UTCJun 30, 21:35 UTC11h 15m
2026-06-30 AAR151 - Jun 30, 04:05 UTCJun 30, 06:00 UTC1h 55m
2026-06-30 AAR152 - Jun 30, 00:55 UTCJun 30, 02:30 UTC1h 36m
2026-06-29 AAR756 ICN → ICN Jun 29, 10:15 UTCJun 29, 20:30 UTC10h 15m

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?
No active broadcast right now. Last signal was 1h ago.
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.