Apparatus

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sensors Mode-S transponder

71C398

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

Currently assigned to HL8398 · AIRBUS A-321neo

Hex
71C398
Octal
34341630
Decimal
7,455,640
Country
KR
Tail
HL8398
Type
A21N
Broadcasting now · callsign AAR366 · 31,000 ft
Flights observed
282
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

Current position

71C398 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C398 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
AAR735 - 40 2026-07-01
AAR736 - 26 2026-06-28
AAR372 - 26 2026-07-02
AAR371 - 21 2026-07-02
AAR744 - 16 2026-07-07
AAR743 Asiana Airlines 16 2026-07-06
AAR173 - 10 2026-06-30
AAR721 - 9 2026-06-27
AAR174 - 8 2026-06-30
AAR722 - 7 2026-06-27
AAR745 - 6 2026-07-10
AAR755 Asiana Airlines 5 2026-06-09
AAR746 - 5 2026-07-10
AAR713 Asiana Airlines 5 2026-06-08
AAR347 - 5 2026-07-12
AAR348 - 4 2026-07-12
AAR714 Asiana Airlines 3 2026-06-08
AAR370 Asiana Airlines 3 2026-06-09
AAR359 - 3 2026-06-24
AAR353 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAR365 - Jul 14, 05:30 UTCJul 14, 06:15 UTC45m
2026-07-13 AAR739 - Jul 13, 10:00 UTCJul 13, 22:15 UTC12h 15m
2026-07-12 AAR740 - Jul 12, 11:45 UTCJul 12, 21:40 UTC9h 55m
2026-07-12 AAR739 - Jul 12, 10:10 UTCJul 12, 10:50 UTC40m
2026-07-12 AAR348 - Jul 12, 07:40 UTCJul 12, 08:01 UTC20m
2026-07-12 AAR347 - Jul 12, 01:20 UTCJul 12, 06:40 UTC5h 20m
2026-07-11 AAR113 KIX → ICN Jul 11, 11:10 UTCJul 11, 12:30 UTC1h 20m
2026-07-11 AAR114 ICN → KIX Jul 11, 08:10 UTCJul 11, 09:40 UTC1h 30m
2026-07-10 AAR746 - Jul 10, 20:40 UTCJul 10, 21:10 UTC30m
2026-07-10 AAR746 - Jul 10, 18:15 UTCJul 10, 18:30 UTC15m
2026-07-10 AAR745 - Jul 10, 13:20 UTCJul 10, 16:30 UTC3h 10m
2026-07-10 AAR133 - Jul 10, 07:40 UTCJul 10, 08:45 UTC1h 5m
2026-07-10 AAR134 - Jul 10, 05:15 UTCJul 10, 06:10 UTC55m
2026-07-10 AAR115 - Jul 10, 00:50 UTCJul 10, 02:15 UTC1h 25m
2026-07-09 AAR116 - Jul 9, 10:50 UTCJul 9, 12:25 UTC1h 35m
2026-07-09 AAR349 - Jul 9, 03:50 UTCJul 9, 09:00 UTC5h 10m
2026-07-08 AAR740 - Jul 8, 10:50 UTCJul 8, 22:15 UTC11h 25m
2026-07-08 AAR340 - Jul 8, 08:50 UTCJul 8, 09:10 UTC20m
2026-07-08 AAR339 - Jul 8, 03:45 UTCJul 8, 04:10 UTC25m
2026-07-07 AAR746 HKG → ICN Jul 7, 17:55 UTCJul 7, 21:05 UTC3h 10m
2026-07-07 AAR745 - Jul 7, 12:15 UTCJul 7, 15:35 UTC3h 20m
2026-07-07 AAR744 - Jul 7, 05:30 UTCJul 7, 10:40 UTC5h 10m
2026-07-06 AAR743 ICN → BKK Jul 6, 22:45 UTCJul 7, 03:55 UTC5h 10m
2026-07-06 AAR744 - Jul 6, 10:30 UTCJul 6, 11:15 UTC45m
2026-07-06 AAR744 - Jul 6, 05:50 UTCJul 6, 09:25 UTC3h 35m
2026-07-05 AAR743 ICN → BKK Jul 5, 22:45 UTCJul 6, 04:10 UTC5h 25m
2026-07-05 AAR744 - Jul 5, 05:20 UTCJul 5, 10:30 UTC5h 10m
2026-07-04 AAR743 ICN → BKK Jul 4, 22:25 UTCJul 5, 03:35 UTC5h 10m
2026-07-04 AAR117 KIX → ICN Jul 4, 15:25 UTCJul 4, 16:50 UTC1h 25m
2026-07-04 AAR118 ICN → KIX Jul 4, 12:05 UTCJul 4, 13:15 UTC1h 10m
2026-07-04 AAR360 - Jul 4, 03:45 UTCJul 4, 09:30 UTC5h 45m
2026-07-03 AAR730 - Jul 3, 06:50 UTCJul 3, 10:30 UTC3h 40m
2026-07-03 AAR729 - Jul 3, 00:45 UTCJul 3, 04:40 UTC3h 55m
2026-07-02 AAR746 - Jul 2, 18:00 UTCJul 2, 21:10 UTC3h 10m
2026-07-02 AAR745 - Jul 2, 14:55 UTCJul 2, 15:20 UTC25m
2026-07-02 AAR745 - Jul 2, 12:00 UTCJul 2, 14:20 UTC2h 20m
2026-07-02 AAR372 - Jul 2, 09:00 UTCJul 2, 09:40 UTC40m
2026-07-02 AAR372 - Jul 2, 06:41 UTCJul 2, 06:51 UTC10m
2026-07-02 AAR371 - Jul 2, 04:20 UTCJul 2, 04:40 UTC20m
2026-07-02 AAR371 - Jul 2, 01:30 UTCJul 2, 02:20 UTC50m
2026-07-01 AAR735 ICN → ICN Jul 1, 11:40 UTCJul 1, 22:40 UTC11h 0m
2026-07-01 AAR372 - Jul 1, 09:05 UTCJul 1, 09:45 UTC40m
2026-07-01 AAR372 - Jul 1, 06:55 UTCJul 1, 07:05 UTC10m
2026-07-01 AAR371 - Jul 1, 04:45 UTCJul 1, 05:00 UTC15m
2026-07-01 AAR371 - Jul 1, 01:40 UTCJul 1, 02:20 UTC40m
2026-06-30 AAR735 ICN → ICN Jun 30, 10:55 UTCJun 30, 22:50 UTC11h 55m
2026-06-30 AAR173 - Jun 30, 05:35 UTCJun 30, 08:00 UTC2h 25m
2026-06-30 AAR174 ICN → CTS Jun 30, 01:40 UTCJun 30, 04:00 UTC2h 20m
2026-06-29 AAR352 - Jun 29, 11:20 UTCJun 29, 11:50 UTC30m
2026-06-29 AAR351 - Jun 29, 06:34 UTCJun 29, 06:54 UTC20m

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 HL8398 page for operator, model, and routing details .

Mode-S 71C398 frequently asked

What is Mode-S code 71C398?
71C398 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8398.
Where is Mode-S 71C398 registered?
Mode-S code 71C398 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 71C398 broadcasting right now?
Yes. Mode-S 71C398 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C398, octal 34341630, decimal 7,455,640.
What flights does 71C398 operate?
Mode-S 71C398 has broadcast 20 distinct callsigns, including AAR735, AAR736, AAR372, AAR371, AAR744.