Apparatus

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sensors Mode-S transponder

71BF54

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

Currently assigned to HL7754 · AIRBUS A-330-300

Hex
71BF54
Octal
34337524
Decimal
7,454,548
Country
KR
Tail
HL7754
Type
A333
No current signal · last broadcast Jul 26, 11:25 UTC
Flights observed
347
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 11:25 UTC

Last known position

Most recent position reported by Mode-S 71BF54.

Country allocation

The ICAO 24-bit address 71BF54 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
AAR301 - 16 2026-07-25
AAR731 Asiana Airlines 15 2026-07-23
AAR302 - 14 2026-07-25
AAR122 - 14 2026-06-21
AAR358 - 12 2026-07-22
AAR178 - 11 2026-07-25
AAR177 - 11 2026-07-25
AAR124 Asiana Airlines 11 2026-06-12
AAR713 Asiana Airlines 10 2026-07-26
AAR123 - 10 2026-06-12
AAR121 - 10 2026-06-21
AAR108 - 10 2026-07-05
AAR107 - 10 2026-07-06
AAR714 Asiana Airlines 9 2026-07-26
AAR747 - 8 2026-07-17
AAR364 - 8 2026-07-17
AAR357 - 8 2026-07-22
AAR133 - 8 2026-06-30
AAR748 - 7 2026-07-21
AAR732 - 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR714 TPE → ICN Jul 26, 09:25 UTCJul 26, 11:25 UTC2h 0m
2026-07-26 AAR713 ICN → TPE Jul 26, 05:40 UTCJul 26, 07:40 UTC2h 1m
2026-07-26 AAR111 KIX → ICN Jul 26, 01:55 UTCJul 26, 03:20 UTC1h 25m
2026-07-25 AAR112 ICN → KIX Jul 25, 22:15 UTCJul 25, 23:30 UTC1h 15m
2026-07-25 AAR177 - Jul 25, 16:45 UTCJul 25, 18:30 UTC1h 45m
2026-07-25 AAR178 ICN → HND Jul 25, 12:25 UTCJul 25, 14:10 UTC1h 45m
2026-07-25 AAR302 - Jul 25, 04:00 UTCJul 25, 04:25 UTC25m
2026-07-25 AAR301 - Jul 25, 00:45 UTCJul 25, 01:10 UTC25m
2026-07-24 AAR177 HND → ICN Jul 24, 17:40 UTCJul 24, 19:25 UTC1h 45m
2026-07-24 AAR178 ICN → HND Jul 24, 12:40 UTCJul 24, 14:40 UTC2h 0m
2026-07-23 AAR731 ICN → SGN Jul 23, 22:55 UTCJul 24, 10:30 UTC11h 35m
2026-07-23 AAR177 HND → ICN Jul 23, 16:55 UTCJul 23, 18:50 UTC1h 55m
2026-07-23 AAR178 ICN → HND Jul 23, 12:55 UTCJul 23, 14:40 UTC1h 45m
2026-07-22 AAR732 - Jul 22, 23:20 UTCJul 23, 10:50 UTC11h 30m
2026-07-22 AAR358 - Jul 22, 19:45 UTCJul 22, 20:35 UTC50m
2026-07-22 AAR358 - Jul 22, 17:30 UTCJul 22, 17:40 UTC10m
2026-07-22 AAR357 - Jul 22, 12:40 UTCJul 22, 13:20 UTC40m
2026-07-22 AAR369 ICN → CAN Jul 22, 00:00 UTCJul 22, 00:45 UTC45m
2026-07-21 AAR748 - Jul 21, 08:40 UTCJul 21, 22:00 UTC13h 20m
2026-07-21 AAR712 TPE → ICN Jul 21, 04:50 UTCJul 21, 06:55 UTC2h 5m
2026-07-21 AAR711 - Jul 21, 01:45 UTCJul 21, 01:55 UTC10m
2026-07-20 AAR711 - Jul 20, 23:55 UTCJul 21, 00:30 UTC35m
2026-07-20 AAR356 - Jul 20, 20:00 UTCJul 20, 20:45 UTC45m
2026-07-20 AAR355 - Jul 20, 12:45 UTCJul 20, 13:25 UTC40m
2026-07-19 AAR732 - Jul 19, 23:20 UTCJul 20, 10:50 UTC11h 30m
2026-07-19 AAR368 ICN → ICN Jul 19, 12:20 UTCJul 19, 19:25 UTC7h 5m
2026-07-17 AAR747 ICN → ICN Jul 17, 09:50 UTCJul 17, 22:45 UTC12h 55m
2026-07-17 AAR364 - Jul 17, 07:14 UTCJul 17, 07:55 UTC40m
2026-07-17 AAR363 - Jul 17, 02:15 UTCJul 17, 02:59 UTC45m
2026-07-16 AAR578 - Jul 16, 22:00 UTCJul 16, 22:25 UTC25m
2026-07-16 AAR577 - Jul 16, 10:59 UTCJul 16, 21:15 UTC10h 15m
2026-07-16 AAR577 - Jul 16, 09:45 UTCJul 16, 10:04 UTC20m
2026-07-16 AAR363 ICN → ICN Jul 16, 02:20 UTCJul 16, 07:45 UTC5h 25m
2026-07-15 AAR574 - Jul 15, 22:25 UTCJul 15, 22:50 UTC25m
2026-07-15 AAR574 - Jul 15, 09:35 UTCJul 15, 21:50 UTC12h 15m
2026-07-15 AAR573 - Jul 15, 08:20 UTCJul 15, 08:40 UTC20m
2026-07-15 AAR361 - Jul 15, 00:25 UTCJul 15, 05:55 UTC5h 30m
2026-07-14 AAR177 HND → ICN Jul 14, 16:50 UTCJul 14, 18:40 UTC1h 50m
2026-07-14 AAR178 - Jul 14, 13:45 UTCJul 14, 15:30 UTC1h 45m
2026-07-13 AAR731 ICN → ICN Jul 13, 23:05 UTCJul 14, 11:05 UTC12h 0m
2026-07-13 AAR714 - Jul 13, 09:35 UTCJul 13, 11:40 UTC2h 5m
2026-07-13 AAR713 - Jul 13, 05:55 UTCJul 13, 08:01 UTC2h 5m
2026-07-13 AAR302 - Jul 13, 03:40 UTCJul 13, 03:55 UTC15m
2026-07-13 AAR301 - Jul 13, 00:30 UTCJul 13, 00:55 UTC25m
2026-07-12 AAR748 - Jul 12, 08:45 UTCJul 12, 21:50 UTC13h 5m
2026-07-11 AAR356 - Jul 11, 20:20 UTCJul 11, 20:35 UTC15m
2026-07-11 AAR355 - Jul 11, 12:30 UTCJul 11, 13:20 UTC50m
2026-07-11 AAR365 ICN → ICN Jul 11, 05:35 UTCJul 11, 10:05 UTC4h 30m
2026-07-11 AAR302 - Jul 11, 03:35 UTCJul 11, 04:01 UTC25m
2026-07-11 AAR301 - Jul 11, 00:35 UTCJul 11, 00:55 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 HL7754 page for operator, model, and routing details .

Mode-S 71BF54 frequently asked

What is Mode-S code 71BF54?
71BF54 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7754.
Where is Mode-S 71BF54 registered?
Mode-S code 71BF54 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 71BF54 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF54, octal 34337524, decimal 7,454,548.
What flights does 71BF54 operate?
Mode-S 71BF54 has broadcast 20 distinct callsigns, including AAR301, AAR731, AAR302, AAR122, AAR358.