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
No current signal · last broadcast 1h ago
Flights observed
143
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C398.

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 Asiana Airlines 30 2026-05-25
AAR736 Asiana Airlines 23 2026-05-25
AAR372 Asiana Airlines 12 2026-05-19
AAR371 Asiana Airlines 10 2026-05-19
AAR173 Asiana Airlines 9 2026-05-23
AAR721 Asiana Airlines 7 2026-05-15
AAR174 Asiana Airlines 7 2026-05-23
AAR743 Asiana Airlines 6 2026-05-30
AAR722 Asiana Airlines 6 2026-05-15
AAR755 Asiana Airlines 4 2026-05-26
AAR744 Asiana Airlines 4 2026-05-29
AAR756 Asiana Airlines 2 2026-05-27
AAR713 Asiana Airlines 2 2026-05-13
AAR353 Asiana Airlines 2 2026-05-13
AAR118 Asiana Airlines 2 2026-05-29
AAR117 Asiana Airlines 2 2026-05-29
AAR714 Asiana Airlines 1 2026-05-13
AAR370 Asiana Airlines 1 2026-05-27
AAR369 Asiana Airlines 1 2026-05-27
AAR365 Asiana Airlines 1 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 AAR743 ICN → BKK May 30, 03:30 UTCMay 30, 04:00 UTC30m
2026-05-29 AAR743 ICN → BKK May 29, 22:50 UTCMay 30, 01:40 UTC2h 50m
2026-05-29 AAR117 KIX → ICN May 29, 15:30 UTCMay 29, 17:00 UTC1h 30m
2026-05-29 AAR118 ICN → KIX May 29, 12:20 UTCMay 29, 13:35 UTC1h 15m
2026-05-29 AAR744 BKK → ICN May 29, 05:30 UTCMay 29, 10:45 UTC5h 15m
2026-05-28 AAR743 ICN → BKK May 28, 22:40 UTCMay 29, 04:00 UTC5h 20m
2026-05-28 AAR117 KIX → ICN May 28, 15:35 UTCMay 28, 17:00 UTC1h 25m
2026-05-28 AAR118 ICN → KIX May 28, 12:15 UTCMay 28, 13:35 UTC1h 20m
2026-05-28 AAR744 BKK → ICN May 28, 05:20 UTCMay 28, 10:40 UTC5h 20m
2026-05-27 AAR743 ICN → BKK May 27, 22:40 UTCMay 28, 03:50 UTC5h 10m
2026-05-27 AAR756 DAD → ICN May 27, 10:15 UTCMay 27, 20:25 UTC10h 10m
2026-05-27 AAR370 CAN → ICN May 27, 07:25 UTCMay 27, 08:00 UTC35m
2026-05-27 AAR369 ICN → CAN May 27, 00:00 UTCMay 27, 00:19 UTC20m
2026-05-26 AAR755 ICN → DAD May 26, 10:14 UTCMay 26, 20:54 UTC10h 40m
2026-05-25 AAR736 SGN → ICN May 25, 12:25 UTCMay 25, 22:15 UTC9h 49m
2026-05-25 AAR735 ICN → SGN May 25, 10:55 UTCMay 25, 11:20 UTC25m
2026-05-24 AAR735 ICN → SGN May 24, 10:55 UTCMay 24, 20:50 UTC9h 55m
2026-05-23 AAR736 SGN → ICN May 23, 13:05 UTCMay 23, 22:55 UTC9h 50m
2026-05-23 AAR735 ICN → SGN May 23, 11:30 UTCMay 23, 11:55 UTC25m
2026-05-23 AAR173 CTS → ICN May 23, 05:45 UTCMay 23, 08:20 UTC2h 35m
2026-05-23 AAR174 ICN → CTS May 23, 01:35 UTCMay 23, 03:55 UTC2h 19m
2026-05-22 AAR756 DAD → ICN May 22, 10:15 UTCMay 22, 20:20 UTC10h 5m
2026-05-21 AAR736 SGN → ICN May 21, 11:05 UTCMay 21, 22:35 UTC11h 30m
2026-05-21 AAR173 CTS → ICN May 21, 05:40 UTCMay 21, 08:25 UTC2h 45m
2026-05-21 AAR174 ICN → CTS May 21, 01:35 UTCMay 21, 03:40 UTC2h 5m
2026-05-20 AAR736 SGN → ICN May 20, 11:05 UTCMay 20, 22:40 UTC11h 35m
2026-05-19 AAR736 SGN → ICN May 19, 11:05 UTCMay 19, 22:50 UTC11h 45m
2026-05-19 AAR372 SZX → ICN May 19, 08:55 UTCMay 19, 09:20 UTC25m
2026-05-19 AAR371 ICN → SZX May 19, 04:10 UTCMay 19, 04:35 UTC25m
2026-05-19 AAR371 ICN → SZX May 19, 01:25 UTCMay 19, 01:50 UTC25m
2026-05-18 AAR735 ICN → SGN May 18, 11:05 UTCMay 18, 22:35 UTC11h 29m
2026-05-17 AAR735 ICN → SGN May 17, 11:10 UTCMay 17, 22:40 UTC11h 30m
2026-05-17 AAR372 SZX → ICN May 17, 08:55 UTCMay 17, 09:30 UTC35m
2026-05-17 AAR372 SZX → ICN May 17, 06:25 UTCMay 17, 06:35 UTC10m
2026-05-17 AAR371 ICN → SZX May 17, 01:30 UTCMay 17, 01:55 UTC25m
2026-05-16 AAR736 SGN → ICN May 16, 11:01 UTCMay 16, 22:55 UTC11h 55m
2026-05-16 AAR334 PEK → ICN May 16, 08:55 UTCMay 16, 09:25 UTC30m
2026-05-16 AAR333 ICN → PEK May 16, 04:15 UTCMay 16, 04:30 UTC15m
2026-05-15 AAR735 ICN → SGN May 15, 12:40 UTCMay 15, 23:55 UTC11h 14m
2026-05-15 AAR722 HKG → ICN May 15, 07:45 UTCMay 15, 10:55 UTC3h 10m
2026-05-15 AAR721 ICN → HKG May 15, 00:50 UTCMay 15, 04:05 UTC3h 15m
2026-05-14 AAR735 ICN → SGN May 14, 10:50 UTCMay 14, 22:30 UTC11h 40m
2026-05-14 AAR173 CTS → ICN May 14, 05:40 UTCMay 14, 07:55 UTC2h 15m
2026-05-14 AAR174 ICN → CTS May 14, 01:50 UTCMay 14, 04:25 UTC2h 35m
2026-05-13 AAR354 CKG → ICN May 13, 21:10 UTCMay 13, 21:30 UTC20m
2026-05-13 AAR353 ICN → CKG May 13, 13:20 UTCMay 13, 13:35 UTC15m
2026-05-13 AAR714 TPE → ICN May 13, 09:15 UTCMay 13, 11:20 UTC2h 5m
2026-05-13 AAR713 ICN → TPE May 13, 06:55 UTCMay 13, 07:35 UTC40m
2026-05-13 AAR713 ICN → TPE May 13, 05:25 UTCMay 13, 06:00 UTC35m
2026-05-12 AAR736 SGN → ICN May 12, 11:20 UTCMay 12, 22:45 UTC11h 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 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?
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 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, AAR173.