Apparatus

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sensors Mode-S transponder

71BF40

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

Currently assigned to HL7740 · AIRBUS A-330-300

Hex
71BF40
Octal
34337500
Decimal
7,454,528
Country
KR
Tail
HL7740
Type
A333
No current signal · last broadcast 23d ago
Flights observed
236
Distinct callsigns
20
Country
KR
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S 71BF40.

Country allocation

The ICAO 24-bit address 71BF40 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
AAR731 Asiana Airlines 13 2026-07-22
AAR713 - 8 2026-07-19
AAR711 - 8 2026-07-14
AAR747 Asiana Airlines 7 2026-07-20
AAR574 - 7 2026-07-25
AAR573 - 7 2026-07-25
AAR301 - 7 2026-07-21
AAR124 - 7 2026-06-22
AAR123 - 7 2026-06-22
AAR107 - 7 2026-06-26
AAR578 Asiana Airlines 6 2026-07-24
AAR567 - 6 2026-07-11
AAR178 - 6 2026-07-17
AAR177 - 6 2026-07-17
AAR122 - 6 2026-06-22
AAR121 - 6 2026-06-22
AAR108 - 6 2026-06-25
AAR714 - 5 2026-07-19
AAR712 - 5 2026-07-14
AAR577 Asiana Airlines 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR173 CTS → ICN Jul 26, 06:00 UTCJul 26, 08:30 UTC2h 31m
2026-07-26 AAR174 ICN → CTS Jul 26, 01:50 UTCJul 26, 04:10 UTC2h 20m
2026-07-25 AAR574 - Jul 25, 22:50 UTCJul 25, 23:05 UTC15m
2026-07-25 AAR573 - Jul 25, 08:10 UTCJul 25, 21:55 UTC13h 45m
2026-07-25 AAR362 PVG → ICN Jul 25, 00:40 UTCJul 25, 05:55 UTC5h 15m
2026-07-24 AAR578 ALA → ICN Jul 24, 22:25 UTCJul 24, 22:45 UTC20m
2026-07-24 AAR578 ALA → ICN Jul 24, 10:55 UTCJul 24, 21:35 UTC10h 40m
2026-07-24 AAR577 ICN → ALA Jul 24, 09:40 UTCJul 24, 10:10 UTC30m
2026-07-24 AAR364 PVG → ICN Jul 24, 02:05 UTCJul 24, 07:10 UTC5h 5m
2026-07-23 AAR578 ALA → ICN Jul 23, 10:05 UTCJul 23, 22:45 UTC12h 40m
2026-07-23 AAR369 ICN → CAN Jul 23, 00:10 UTCJul 23, 08:00 UTC7h 50m
2026-07-22 AAR731 ICN → SGN Jul 22, 00:40 UTCJul 22, 01:45 UTC1h 5m
2026-07-21 AAR731 ICN → SGN Jul 21, 23:00 UTCJul 21, 23:40 UTC40m
2026-07-21 AAR105 NRT → ICN Jul 21, 11:05 UTCJul 21, 13:20 UTC2h 15m
2026-07-21 AAR106 ICN → NRT Jul 21, 07:00 UTCJul 21, 08:55 UTC1h 55m
2026-07-21 AAR302 - Jul 21, 03:30 UTCJul 21, 03:55 UTC25m
2026-07-21 AAR301 - Jul 21, 00:40 UTCJul 21, 01:15 UTC35m
2026-07-20 AAR747 ICN → HKT Jul 20, 09:00 UTCJul 20, 21:50 UTC12h 50m
2026-07-20 AAR361 ICN → PVG Jul 20, 00:35 UTCJul 20, 05:50 UTC5h 15m
2026-07-19 AAR714 TPE → ICN Jul 19, 10:55 UTCJul 19, 12:50 UTC1h 55m
2026-07-19 AAR713 ICN → TPE Jul 19, 07:20 UTCJul 19, 09:35 UTC2h 15m
2026-07-18 AAR714 - Jul 18, 09:15 UTCJul 18, 11:20 UTC2h 5m
2026-07-18 AAR713 - Jul 18, 07:10 UTCJul 18, 07:25 UTC15m
2026-07-18 AAR713 - Jul 18, 05:25 UTCJul 18, 06:05 UTC40m
2026-07-18 AAR111 KIX → ICN Jul 18, 02:00 UTCJul 18, 03:15 UTC1h 16m
2026-07-17 AAR112 - Jul 17, 22:25 UTCJul 17, 23:50 UTC1h 25m
2026-07-17 AAR177 HND → ICN Jul 17, 16:55 UTCJul 17, 18:55 UTC2h 0m
2026-07-17 AAR178 - Jul 17, 12:40 UTCJul 17, 14:39 UTC2h 0m
2026-07-17 AAR732 - Jul 17, 10:10 UTCJul 17, 10:44 UTC35m
2026-07-16 AAR731 - Jul 16, 22:59 UTCJul 17, 08:59 UTC10h 0m
2026-07-16 AAR714 - Jul 16, 10:35 UTCJul 16, 11:10 UTC35m
2026-07-16 AAR713 - Jul 16, 07:10 UTCJul 16, 07:25 UTC15m
2026-07-16 AAR713 - Jul 16, 05:20 UTCJul 16, 06:05 UTC45m
2026-07-16 AAR111 - Jul 16, 01:55 UTCJul 16, 03:15 UTC1h 20m
2026-07-15 AAR112 ICN → KIX Jul 15, 22:10 UTCJul 15, 23:30 UTC1h 20m
2026-07-15 AAR365 - Jul 15, 05:35 UTCJul 15, 10:20 UTC4h 45m
2026-07-15 AAR302 - Jul 15, 03:35 UTCJul 15, 03:55 UTC20m
2026-07-15 AAR301 - Jul 15, 00:30 UTCJul 15, 00:55 UTC25m
2026-07-14 AAR578 - Jul 14, 22:05 UTCJul 14, 22:25 UTC20m
2026-07-14 AAR577 - Jul 14, 09:40 UTCJul 14, 21:20 UTC11h 40m
2026-07-14 AAR712 - Jul 14, 04:45 UTCJul 14, 06:55 UTC2h 10m
2026-07-14 AAR711 - Jul 14, 02:25 UTCJul 14, 02:50 UTC25m
2026-07-14 AAR711 - Jul 14, 00:45 UTCJul 14, 01:25 UTC40m
2026-07-13 AAR574 - Jul 13, 22:15 UTCJul 13, 22:35 UTC20m
2026-07-13 AAR573 - Jul 13, 09:10 UTCJul 13, 21:25 UTC12h 15m
2026-07-13 AAR573 - Jul 13, 08:01 UTCJul 13, 08:15 UTC15m
2026-07-13 AAR361 ICN → ICN Jul 13, 00:20 UTCJul 13, 05:50 UTC5h 30m
2026-07-11 AAR732 - Jul 11, 22:55 UTCJul 12, 10:45 UTC11h 50m
2026-07-11 AAR568 - Jul 11, 19:25 UTCJul 11, 19:40 UTC15m
2026-07-11 AAR567 - Jul 11, 13:10 UTCJul 11, 13:25 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 HL7740 page for operator, model, and routing details .

Mode-S 71BF40 frequently asked

What is Mode-S code 71BF40?
71BF40 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7740.
Where is Mode-S 71BF40 registered?
Mode-S code 71BF40 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 71BF40 broadcasting right now?
No active broadcast right now. Last signal was 23d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF40, octal 34337500, decimal 7,454,528.
What flights does 71BF40 operate?
Mode-S 71BF40 has broadcast 20 distinct callsigns, including AAR731, AAR713, AAR711, AAR747, AAR574.