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 5h ago
Flights observed
308
Distinct callsigns
20
Country
KR
Last broadcast
5h ago

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 - 15 2026-07-13
AAR731 - 14 2026-07-13
AAR122 - 14 2026-06-21
AAR302 - 13 2026-07-13
AAR124 Asiana Airlines 11 2026-06-12
AAR358 - 10 2026-07-08
AAR123 - 10 2026-06-12
AAR121 - 10 2026-06-21
AAR108 - 10 2026-07-05
AAR107 - 10 2026-07-06
AAR713 - 9 2026-07-13
AAR714 - 8 2026-07-13
AAR133 - 8 2026-06-30
AAR747 - 7 2026-06-27
AAR370 - 7 2026-06-22
AAR364 - 7 2026-07-10
AAR357 - 7 2026-07-08
AAR178 - 7 2026-07-06
AAR177 - 7 2026-07-06
AAR748 - 6 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAR731 - Jul 13, 23:05 UTCJul 14, 01:55 UTC2h 50m
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
2026-07-10 AAR578 - Jul 10, 22:25 UTCJul 10, 22:45 UTC20m
2026-07-10 AAR577 - Jul 10, 09:50 UTCJul 10, 21:30 UTC11h 40m
2026-07-10 AAR364 - Jul 10, 02:30 UTCJul 10, 07:10 UTC4h 40m
2026-07-09 AAR105 - Jul 9, 11:35 UTCJul 9, 13:30 UTC1h 55m
2026-07-09 AAR106 ICN → NRT Jul 9, 08:05 UTCJul 9, 10:00 UTC1h 55m
2026-07-09 AAR362 - Jul 9, 00:45 UTCJul 9, 06:15 UTC5h 30m
2026-07-08 AAR358 - Jul 8, 19:50 UTCJul 8, 20:35 UTC45m
2026-07-08 AAR357 - Jul 8, 12:25 UTCJul 8, 13:10 UTC45m
2026-07-07 AAR731 - Jul 7, 22:55 UTCJul 8, 10:35 UTC11h 40m
2026-07-07 AAR714 - Jul 7, 09:15 UTCJul 7, 11:10 UTC1h 55m
2026-07-07 AAR713 ICN → TPE Jul 7, 05:20 UTCJul 7, 07:30 UTC2h 10m
2026-07-07 AAR111 KIX → ICN Jul 7, 01:45 UTCJul 7, 03:15 UTC1h 30m
2026-07-06 AAR112 - Jul 6, 22:20 UTCJul 6, 23:40 UTC1h 20m
2026-07-06 AAR177 HND → ICN Jul 6, 17:00 UTCJul 6, 19:00 UTC2h 0m
2026-07-06 AAR178 - Jul 6, 12:30 UTCJul 6, 14:05 UTC1h 35m
2026-07-06 AAR334 - Jul 6, 09:25 UTCJul 6, 09:45 UTC20m
2026-07-06 AAR333 - Jul 6, 05:05 UTCJul 6, 05:25 UTC20m
2026-07-06 AAR107 - Jul 6, 00:20 UTCJul 6, 02:25 UTC2h 5m
2026-07-05 AAR108 - Jul 5, 09:50 UTCJul 5, 11:40 UTC1h 50m
2026-07-05 AAR712 TPE → ICN Jul 5, 04:50 UTCJul 5, 07:05 UTC2h 15m
2026-07-05 AAR711 ICN → TPE Jul 5, 00:15 UTCJul 5, 02:20 UTC2h 5m
2026-07-04 AAR177 HND → ICN Jul 4, 16:45 UTCJul 4, 18:45 UTC2h 0m
2026-07-04 AAR178 - Jul 4, 12:40 UTCJul 4, 14:30 UTC1h 50m
2026-07-04 AAR334 - Jul 4, 09:45 UTCJul 4, 10:05 UTC20m
2026-07-04 AAR333 - Jul 4, 04:20 UTCJul 4, 04:40 UTC20m
2026-07-04 AAR107 - Jul 4, 00:20 UTCJul 4, 02:30 UTC2h 10m
2026-07-03 AAR108 - Jul 3, 09:50 UTCJul 3, 11:40 UTC1h 50m
2026-07-03 AAR702 - Jul 3, 04:20 UTCJul 3, 07:45 UTC3h 25m
2026-07-02 AAR701 - Jul 2, 23:10 UTCJul 3, 02:40 UTC3h 30m
2026-07-02 AAR105 - Jul 2, 11:15 UTCJul 2, 13:15 UTC2h 0m
2026-07-02 AAR106 - Jul 2, 07:50 UTCJul 2, 09:40 UTC1h 50m
2026-07-02 AAR362 - Jul 2, 05:15 UTCJul 2, 05:55 UTC40m
2026-07-02 AAR361 - Jul 2, 01:00 UTCJul 2, 01:40 UTC40m
2026-07-01 AAR568 - Jul 1, 19:05 UTCJul 1, 19:30 UTC25m
2026-07-01 AAR567 - Jul 1, 12:05 UTCJul 1, 13:35 UTC1h 30m
2026-07-01 AAR173 - Jul 1, 05:50 UTCJul 1, 08:20 UTC2h 30m
2026-07-01 AAR174 - Jul 1, 01:35 UTCJul 1, 03:45 UTC2h 10m
2026-06-30 AAR177 - Jun 30, 16:50 UTCJun 30, 18:45 UTC1h 55m
2026-06-30 AAR178 ICN → HND Jun 30, 12:35 UTCJun 30, 14:25 UTC1h 50m

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 5h ago.
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, AAR122, AAR302, AAR124.