Apparatus

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sensors Mode-S transponder

71C381

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

Currently assigned to HL8381 · AIRBUS A-350-900

Hex
71C381
Octal
34341601
Decimal
7,455,617
Country
KR
Tail
HL8381
Type
A359
Broadcasting now · callsign AAR742 · 125 ft
Flights observed
170
Distinct callsigns
20
Country
KR
Last broadcast
23d ago

Current position

71C381 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C381 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
AAR742 Asiana Airlines 8 2026-07-21
AAR741 Asiana Airlines 8 2026-07-21
AAR548 - 8 2026-07-23
AAR547 - 8 2026-07-22
AAR222 Asiana Airlines 8 2026-07-25
AAR221 Asiana Airlines 8 2026-07-25
AAR761 - 7 2026-07-09
AAR752 Asiana Airlines 7 2026-06-24
AAR751 - 7 2026-06-24
AAR562 - 6 2026-07-13
AAR561 - 6 2026-07-12
AAR512 - 6 2026-07-21
AAR204 Asiana Airlines 6 2026-07-23
AAR203 Asiana Airlines 6 2026-07-24
AAR511 - 5 2026-07-20
AAR762 - 4 2026-07-09
AAR542 - 4 2026-07-17
AAR541 - 4 2026-07-16
AAR522 - 4 2026-07-06
AAR502 Asiana Airlines 4 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR212 ICN → SFO Jul 26, 13:15 UTCJul 26, 15:10 UTC1h 55m
2026-07-25 AAR221 JFK → ICN Jul 25, 16:10 UTCJul 26, 07:05 UTC14h 56m
2026-07-25 AAR222 ICN → JFK Jul 25, 00:15 UTCJul 25, 13:25 UTC13h 10m
2026-07-24 AAR203 LAX → ICN Jul 24, 06:25 UTCJul 24, 18:00 UTC11h 35m
2026-07-23 AAR204 ICN → LAX Jul 23, 13:05 UTCJul 24, 00:20 UTC11h 15m
2026-07-23 AAR548 - Jul 23, 03:40 UTCJul 23, 04:05 UTC25m
2026-07-22 AAR548 - Jul 22, 18:15 UTCJul 23, 02:45 UTC8h 30m
2026-07-22 AAR547 - Jul 22, 05:20 UTCJul 22, 15:45 UTC10h 25m
2026-07-22 AAR547 - Jul 22, 04:00 UTCJul 22, 04:20 UTC20m
2026-07-21 AAR742 BKK → ICN Jul 21, 19:40 UTCJul 22, 00:40 UTC5h 0m
2026-07-21 AAR741 ICN → BKK Jul 21, 11:05 UTCJul 21, 16:00 UTC4h 55m
2026-07-21 AAR512 - Jul 21, 06:40 UTCJul 21, 07:00 UTC20m
2026-07-20 AAR512 - Jul 20, 20:00 UTCJul 21, 05:55 UTC9h 55m
2026-07-20 AAR511 - Jul 20, 04:35 UTCJul 20, 17:35 UTC13h 0m
2026-07-20 AAR511 - Jul 20, 03:25 UTCJul 20, 03:45 UTC20m
2026-07-18 AAR221 JFK → ICN Jul 18, 20:35 UTCJul 19, 10:55 UTC14h 20m
2026-07-18 AAR222 ICN → JFK Jul 18, 00:39 UTCJul 18, 14:30 UTC13h 51m
2026-07-17 AAR734 HAN → ICN Jul 17, 20:15 UTCJul 17, 21:15 UTC1h 0m
2026-07-17 AAR733 - Jul 17, 11:20 UTCJul 17, 12:04 UTC45m
2026-07-17 AAR542 - Jul 17, 04:54 UTCJul 17, 05:20 UTC25m
2026-07-16 AAR542 - Jul 16, 18:44 UTCJul 17, 04:10 UTC9h 25m
2026-07-16 AAR541 - Jul 16, 04:20 UTCJul 16, 16:05 UTC11h 45m
2026-07-16 AAR541 - Jul 16, 03:05 UTCJul 16, 03:30 UTC25m
2026-07-15 AAR742 - Jul 15, 22:00 UTCJul 16, 00:55 UTC2h 55m
2026-07-15 AAR742 - Jul 15, 19:50 UTCJul 15, 20:05 UTC15m
2026-07-15 AAR741 - Jul 15, 15:40 UTCJul 15, 15:55 UTC15m
2026-07-15 AAR741 - Jul 15, 11:00 UTCJul 15, 13:35 UTC2h 35m
2026-07-14 AAR221 JFK → ICN Jul 14, 16:25 UTCJul 15, 06:45 UTC14h 19m
2026-07-13 AAR222 ICN → JFK Jul 13, 23:55 UTCJul 14, 13:05 UTC13h 10m
2026-07-13 AAR562 - Jul 13, 05:50 UTCJul 13, 06:15 UTC25m
2026-07-12 AAR562 - Jul 12, 19:55 UTCJul 13, 05:05 UTC9h 10m
2026-07-12 AAR561 - Jul 12, 05:55 UTCJul 12, 16:55 UTC11h 0m
2026-07-12 AAR561 - Jul 12, 04:45 UTCJul 12, 05:05 UTC20m
2026-07-11 AAR742 - Jul 11, 23:35 UTCJul 11, 23:50 UTC15m
2026-07-11 AAR742 - Jul 11, 20:10 UTCJul 11, 20:30 UTC20m
2026-07-11 AAR742 - Jul 11, 19:00 UTCJul 11, 19:15 UTC15m
2026-07-11 AAR741 - Jul 11, 16:40 UTCJul 11, 16:55 UTC15m
2026-07-11 AAR741 - Jul 11, 15:25 UTCJul 11, 15:45 UTC20m
2026-07-11 AAR741 - Jul 11, 12:00 UTCJul 11, 12:15 UTC15m
2026-07-11 AAR562 - Jul 11, 05:55 UTCJul 11, 06:20 UTC25m
2026-07-10 AAR562 - Jul 10, 20:05 UTCJul 11, 05:05 UTC9h 0m
2026-07-10 AAR561 - Jul 10, 06:05 UTCJul 10, 17:50 UTC11h 45m
2026-07-10 AAR561 - Jul 10, 04:55 UTCJul 10, 05:15 UTC20m
2026-07-09 AAR762 - Jul 9, 16:20 UTCJul 9, 21:30 UTC5h 10m
2026-07-09 AAR761 - Jul 9, 12:25 UTCJul 9, 12:40 UTC15m
2026-07-09 AAR761 - Jul 9, 06:15 UTCJul 9, 10:50 UTC4h 35m
2026-07-09 AAR548 - Jul 9, 03:40 UTCJul 9, 04:05 UTC25m
2026-07-08 AAR548 - Jul 8, 18:10 UTCJul 9, 02:55 UTC8h 45m
2026-07-08 AAR547 - Jul 8, 05:40 UTCJul 8, 16:30 UTC10h 50m
2026-07-08 AAR547 - Jul 8, 04:20 UTCJul 8, 04:35 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 HL8381 page for operator, model, and routing details .

Mode-S 71C381 frequently asked

What is Mode-S code 71C381?
71C381 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8381.
Where is Mode-S 71C381 registered?
Mode-S code 71C381 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 71C381 broadcasting right now?
Yes. Mode-S 71C381 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C381, octal 34341601, decimal 7,455,617.
What flights does 71C381 operate?
Mode-S 71C381 has broadcast 20 distinct callsigns, including AAR742, AAR741, AAR548, AAR547, AAR222.