Apparatus

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sensors Mode-S transponder

71BF91

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

Currently assigned to HL7791 · BOEING 777-200

Hex
71BF91
Octal
34337621
Decimal
7,454,609
Country
KR
Tail
HL7791
Type
B772
No current signal · last broadcast 1h ago
Flights observed
99
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71BF91.

Country allocation

The ICAO 24-bit address 71BF91 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
AAR704 Asiana Airlines 11 2026-05-24
AAR703 Asiana Airlines 10 2026-05-24
AAR729 Asiana Airlines 5 2026-05-22
AAR730 Asiana Airlines 4 2026-05-26
AAR713 Asiana Airlines 4 2026-04-29
AAR371 Asiana Airlines 4 2026-05-18
AAR370 Asiana Airlines 4 2026-05-02
AAR360 Asiana Airlines 4 2026-05-23
AAR232 Asiana Airlines 4 2026-05-23
AAR231 Asiana Airlines 4 2026-05-23
AAR714 Asiana Airlines 3 2026-04-29
AAR551 Asiana Airlines 3 2026-04-16
AAR372 Asiana Airlines 3 2026-05-18
AAR369 Asiana Airlines 3 2026-05-02
AAR363 Asiana Airlines 3 2026-04-26
AAR122 Asiana Airlines 3 2026-05-09
AAR762 Asiana Airlines 2 2026-05-25
AAR702 Asiana Airlines 2 2026-05-12
AAR602 Asiana Airlines 2 2026-05-30
AAR601 Asiana Airlines 2 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 AAR602 SYD → ICN May 30, 00:05 UTCMay 30, 00:15 UTC10m
2026-05-29 AAR601 ICN → SYD May 29, 11:55 UTCMay 29, 21:40 UTC9h 45m
2026-05-29 AAR602 SYD → ICN May 29, 00:00 UTCMay 29, 10:00 UTC10h 0m
2026-05-28 AAR601 ICN → SYD May 28, 11:35 UTCMay 28, 21:30 UTC9h 55m
2026-05-26 AAR730 SGN → PUS May 26, 00:44 UTCMay 26, 10:44 UTC10h 0m
2026-05-25 AAR762 CGK → ICN May 25, 16:30 UTCMay 25, 21:35 UTC5h 4m
2026-05-25 AAR762 CGK → ICN May 25, 14:45 UTCMay 25, 14:55 UTC10m
2026-05-25 AAR761 ICN → CGK May 25, 06:15 UTCMay 25, 10:55 UTC4h 40m
2026-05-24 AAR704 MNL → ICN May 24, 16:10 UTCMay 24, 19:35 UTC3h 25m
2026-05-24 AAR703 ICN → MNL May 24, 10:40 UTCMay 24, 14:05 UTC3h 25m
2026-05-23 AAR231 HNL → ICN May 23, 22:35 UTCMay 24, 08:10 UTC9h 35m
2026-05-23 AAR232 ICN → HNL May 23, 11:45 UTCMay 23, 13:30 UTC1h 45m
2026-05-23 AAR360 HGH → ICN May 23, 03:55 UTCMay 23, 09:15 UTC5h 20m
2026-05-22 AAR729 PUS → SGN May 22, 02:00 UTCMay 22, 11:40 UTC9h 40m
2026-05-21 AAR360 HGH → ICN May 21, 04:10 UTCMay 21, 09:10 UTC5h 0m
2026-05-20 AAR334 PEK → ICN May 20, 09:05 UTCMay 20, 09:20 UTC15m
2026-05-20 AAR333 ICN → PEK May 20, 04:35 UTCMay 20, 04:50 UTC16m
2026-05-19 AAR704 MNL → ICN May 19, 16:00 UTCMay 19, 19:20 UTC3h 20m
2026-05-19 AAR703 ICN → MNL May 19, 10:45 UTCMay 19, 14:10 UTC3h 25m
2026-05-19 AAR133 FUK → ICN May 19, 07:45 UTCMay 19, 08:45 UTC1h 0m
2026-05-19 AAR134 ICN → FUK May 19, 05:15 UTCMay 19, 05:45 UTC30m
2026-05-18 AAR372 SZX → ICN May 18, 09:10 UTCMay 18, 09:40 UTC30m
2026-05-18 AAR371 ICN → SZX May 18, 04:40 UTCMay 18, 04:51 UTC10m
2026-05-18 AAR371 ICN → SZX May 18, 01:45 UTCMay 18, 02:10 UTC25m
2026-05-15 AAR704 MNL → ICN May 15, 16:25 UTCMay 15, 19:55 UTC3h 30m
2026-05-15 AAR703 ICN → MNL May 15, 10:40 UTCMay 15, 14:05 UTC3h 25m
2026-05-15 AAR115 KIX → ICN May 15, 00:55 UTCMay 15, 02:15 UTC1h 20m
2026-05-14 AAR116 ICN → KIX May 14, 11:01 UTCMay 14, 12:35 UTC1h 35m
2026-05-13 AAR704 MNL → ICN May 13, 16:20 UTCMay 13, 19:40 UTC3h 20m
2026-05-13 AAR703 ICN → MNL May 13, 11:15 UTCMay 13, 14:40 UTC3h 25m
2026-05-13 AAR360 HGH → ICN May 13, 04:05 UTCMay 13, 09:20 UTC5h 15m
2026-05-12 AAR704 MNL → ICN May 12, 15:55 UTCMay 12, 19:15 UTC3h 20m
2026-05-12 AAR703 ICN → MNL May 12, 10:50 UTCMay 12, 14:15 UTC3h 25m
2026-05-12 AAR702 MNL → ICN May 12, 04:35 UTCMay 12, 08:05 UTC3h 30m
2026-05-11 AAR702 MNL → ICN May 11, 04:30 UTCMay 11, 07:50 UTC3h 20m
2026-05-10 AAR701 ICN → MNL May 10, 23:25 UTCMay 11, 02:50 UTC3h 25m
2026-05-09 AAR123 NGO → ICN May 9, 10:20 UTCMay 9, 11:50 UTC1h 30m
2026-05-09 AAR124 ICN → NGO May 9, 07:30 UTCMay 9, 08:40 UTC1h 10m
2026-05-09 AAR121 NGO → ICN May 9, 03:25 UTCMay 9, 04:55 UTC1h 30m
2026-05-09 AAR122 ICN → NGO May 9, 00:35 UTCMay 9, 01:45 UTC1h 10m
2026-05-04 AAR729 PUS → SGN May 4, 00:55 UTCMay 4, 10:30 UTC9h 35m
2026-05-03 AAR360 HGH → ICN May 3, 04:05 UTCMay 3, 09:25 UTC5h 20m
2026-05-02 AAR704 MNL → ICN May 2, 16:20 UTCMay 2, 19:30 UTC3h 10m
2026-05-02 AAR703 ICN → MNL May 2, 11:00 UTCMay 2, 14:45 UTC3h 45m
2026-05-02 AAR370 CAN → ICN May 2, 07:00 UTCMay 2, 07:40 UTC40m
2026-05-02 AAR369 ICN → CAN May 2, 00:00 UTCMay 2, 00:40 UTC40m
2026-05-01 AAR123 NGO → ICN May 1, 10:30 UTCMay 1, 12:00 UTC1h 30m
2026-05-01 AAR124 ICN → NGO May 1, 07:25 UTCMay 1, 07:45 UTC20m
2026-05-01 AAR121 NGO → ICN May 1, 03:25 UTCMay 1, 04:50 UTC1h 25m
2026-05-01 AAR122 ICN → NGO May 1, 01:35 UTCMay 1, 01:55 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 HL7791 page for operator, model, and routing details .

Mode-S 71BF91 frequently asked

What is Mode-S code 71BF91?
71BF91 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7791.
Where is Mode-S 71BF91 registered?
Mode-S code 71BF91 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 71BF91 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF91, octal 34337621, decimal 7,454,609.
What flights does 71BF91 operate?
Mode-S 71BF91 has broadcast 20 distinct callsigns, including AAR704, AAR703, AAR729, AAR730, AAR713.