Apparatus

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sensors Mode-S transponder

71BF71

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

Currently assigned to HL7771 · AIRBUS A-350-900

Hex
71BF71
Octal
34337561
Decimal
7,454,577
Country
KR
Tail
HL7771
Type
A359
Broadcasting now · 30,875 ft
Flights observed
91
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Current position

71BF71 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71BF71 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
AAR522 Asiana Airlines 16 2026-05-26
AAR521 Asiana Airlines 16 2026-05-24
AAR761 Asiana Airlines 7 2026-05-03
AAR582 - 6 2026-05-29
AAR581 Asiana Airlines 5 2026-05-28
AAR762 Asiana Airlines 4 2026-05-03
AAR751 Asiana Airlines 3 2026-04-13
AAR734 Asiana Airlines 3 2026-05-27
AAR733 Asiana Airlines 3 2026-05-27
AAR752 Asiana Airlines 2 2026-04-13
AAR512 Asiana Airlines 2 2026-04-20
AAR502 - 2 2026-04-13
AAR212 Asiana Airlines 2 2026-05-23
AAR211 Asiana Airlines 2 2026-05-24
AAR114 Asiana Airlines 2 2026-05-01
AAR113 Asiana Airlines 2 2026-05-01
AAR744 Asiana Airlines 1 2026-05-23
AAR743 Asiana Airlines 1 2026-05-22
AAR742 Asiana Airlines 1 2026-05-29
AAR741 Asiana Airlines 1 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AAR742 BKK → ICN May 29, 19:00 UTCMay 29, 23:55 UTC4h 55m
2026-05-29 AAR741 ICN → BKK May 29, 11:05 UTCMay 29, 16:10 UTC5h 5m
2026-05-29 AAR582 - May 29, 07:35 UTCMay 29, 08:00 UTC25m
2026-05-28 AAR582 - May 28, 21:20 UTCMay 29, 06:50 UTC9h 30m
2026-05-28 AAR581 ICN → MXP May 28, 06:35 UTCMay 28, 19:00 UTC12h 25m
2026-05-28 AAR581 ICN → MXP May 28, 05:15 UTCMay 28, 05:30 UTC15m
2026-05-27 AAR734 HAN → ICN May 27, 17:15 UTCMay 27, 20:50 UTC3h 35m
2026-05-27 AAR733 ICN → HAN May 27, 11:15 UTCMay 27, 15:15 UTC4h 0m
2026-05-27 AAR582 - May 27, 07:30 UTCMay 27, 07:50 UTC20m
2026-05-26 AAR582 - May 26, 21:09 UTCMay 27, 06:44 UTC9h 35m
2026-05-26 AAR581 ICN → MXP May 26, 07:24 UTCMay 26, 19:10 UTC11h 45m
2026-05-26 AAR581 ICN → MXP May 26, 06:20 UTCMay 26, 06:34 UTC15m
2026-05-26 AAR522 LHR → ICN May 26, 03:45 UTCMay 26, 04:00 UTC15m
2026-05-25 AAR522 LHR → ICN May 25, 16:15 UTCMay 26, 02:49 UTC10h 34m
2026-05-24 AAR521 ICN → LHR May 24, 23:15 UTCMay 25, 12:50 UTC13h 35m
2026-05-24 AAR211 SFO → ICN May 24, 07:25 UTCMay 24, 19:25 UTC12h 0m
2026-05-23 AAR212 ICN → SFO May 23, 12:45 UTCMay 23, 22:35 UTC9h 51m
2026-05-23 AAR744 BKK → ICN May 23, 05:30 UTCMay 23, 10:35 UTC5h 5m
2026-05-22 AAR743 ICN → BKK May 22, 22:40 UTCMay 23, 03:45 UTC5h 4m
2026-05-03 AAR762 CGK → ICN May 3, 16:40 UTCMay 3, 21:24 UTC4h 45m
2026-05-03 AAR761 ICN → CGK May 3, 13:00 UTCMay 3, 13:15 UTC15m
2026-05-03 AAR761 ICN → CGK May 3, 06:30 UTCMay 3, 11:35 UTC5h 5m
2026-05-03 AAR522 LHR → ICN May 3, 04:10 UTCMay 3, 04:30 UTC20m
2026-05-02 AAR522 LHR → ICN May 2, 16:20 UTCMay 3, 03:10 UTC10h 50m
2026-05-01 AAR521 ICN → LHR May 1, 23:30 UTCMay 2, 12:55 UTC13h 25m
2026-05-01 AAR113 KIX → ICN May 1, 11:40 UTCMay 1, 13:00 UTC1h 20m
2026-05-01 AAR114 ICN → KIX May 1, 08:20 UTCMay 1, 09:45 UTC1h 25m
2026-05-01 AAR115 KIX → ICN May 1, 01:40 UTCMay 1, 02:50 UTC1h 10m
2026-04-30 AAR116 ICN → KIX Apr 30, 11:40 UTCApr 30, 12:45 UTC1h 5m
2026-04-30 AAR133 FUK → ICN Apr 30, 08:40 UTCApr 30, 09:35 UTC55m
2026-04-30 AAR134 ICN → FUK Apr 30, 06:10 UTCApr 30, 06:40 UTC30m
2026-04-30 AAR522 LHR → ICN Apr 30, 03:40 UTCApr 30, 03:50 UTC10m
2026-04-29 AAR522 LHR → ICN Apr 29, 16:00 UTCApr 30, 02:40 UTC10h 39m
2026-04-29 AAR521 ICN → LHR Apr 29, 00:50 UTCApr 29, 13:20 UTC12h 31m
2026-04-28 AAR521 ICN → LHR Apr 28, 23:35 UTCApr 28, 23:45 UTC10m
2026-04-28 AAR211 SFO → ICN Apr 28, 07:20 UTCApr 28, 19:25 UTC12h 5m
2026-04-27 AAR212 ICN → SFO Apr 27, 12:15 UTCApr 27, 22:00 UTC9h 45m
2026-04-27 AAR103 NRT → ICN Apr 27, 08:00 UTCApr 27, 10:10 UTC2h 10m
2026-04-27 AAR104 ICN → NRT Apr 27, 03:30 UTCApr 27, 05:25 UTC1h 55m
2026-04-26 AAR762 CGK → ICN Apr 26, 16:35 UTCApr 26, 21:20 UTC4h 45m
2026-04-26 AAR761 ICN → CGK Apr 26, 12:45 UTCApr 26, 13:00 UTC15m
2026-04-26 AAR761 ICN → CGK Apr 26, 06:25 UTCApr 26, 11:10 UTC4h 45m
2026-04-26 AAR522 LHR → ICN Apr 26, 03:20 UTCApr 26, 03:40 UTC20m
2026-04-25 AAR522 LHR → ICN Apr 25, 16:05 UTCApr 26, 02:25 UTC10h 20m
2026-04-25 AAR521 ICN → LHR Apr 25, 00:30 UTCApr 25, 13:35 UTC13h 5m
2026-04-24 AAR521 ICN → LHR Apr 24, 23:20 UTCApr 24, 23:35 UTC15m
2026-04-24 AAR734 HAN → ICN Apr 24, 11:00 UTCApr 24, 21:05 UTC10h 5m
2026-04-24 AAR582 - Apr 24, 07:20 UTCApr 24, 07:35 UTC15m
2026-04-23 AAR582 - Apr 23, 20:30 UTCApr 24, 06:25 UTC9h 55m
2026-04-23 AAR581 ICN → MXP Apr 23, 06:25 UTCApr 23, 18:15 UTC11h 49m

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 HL7771 page for operator, model, and routing details .

Mode-S 71BF71 frequently asked

What is Mode-S code 71BF71?
71BF71 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7771.
Where is Mode-S 71BF71 registered?
Mode-S code 71BF71 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 71BF71 broadcasting right now?
Yes. Mode-S 71BF71 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF71, octal 34337561, decimal 7,454,577.
What flights does 71BF71 operate?
Mode-S 71BF71 has broadcast 20 distinct callsigns, including AAR522, AAR521, AAR761, AAR582, AAR581.