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
No current signal · last broadcast Jul 26, 15:25 UTC
Flights observed
211
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 15:25 UTC

Last known position

Most recent position reported by Mode-S 71BF71.

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 23 2026-07-17
AAR521 - 22 2026-07-16
AAR761 Asiana Airlines 15 2026-07-21
AAR582 - 10 2026-07-19
AAR581 - 9 2026-07-18
AAR212 - 9 2026-07-15
AAR762 Asiana Airlines 8 2026-07-21
AAR211 - 8 2026-07-16
AAR751 - 6 2026-06-30
AAR512 - 6 2026-07-15
AAR502 - 6 2026-07-07
AAR752 Asiana Airlines 5 2026-06-30
AAR741 Asiana Airlines 5 2026-06-19
AAR733 Asiana Airlines 5 2026-06-02
AAR511 - 5 2026-07-14
AAR742 - 4 2026-06-19
AAR734 Asiana Airlines 4 2026-06-02
AAR548 - 4 2026-06-08
AAR547 - 4 2026-06-07
AAR546 - 4 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR204 ICN → LAX Jul 26, 13:30 UTCJul 26, 15:25 UTC1h 55m
2026-07-21 AAR762 CGK → ICN Jul 21, 16:25 UTCJul 21, 21:30 UTC5h 5m
2026-07-21 AAR761 ICN → CGK Jul 21, 12:35 UTCJul 21, 12:55 UTC20m
2026-07-21 AAR761 ICN → CGK Jul 21, 06:30 UTCJul 21, 11:15 UTC4h 45m
2026-07-20 AAR203 LAX → ICN Jul 20, 06:30 UTCJul 20, 18:15 UTC11h 45m
2026-07-19 AAR204 ICN → LAX Jul 19, 13:05 UTCJul 20, 00:15 UTC11h 10m
2026-07-19 AAR582 - Jul 19, 10:10 UTCJul 19, 10:35 UTC25m
2026-07-19 AAR582 - Jul 19, 00:05 UTCJul 19, 09:30 UTC9h 25m
2026-07-18 AAR581 - Jul 18, 10:20 UTCJul 18, 21:35 UTC11h 15m
2026-07-18 AAR581 - Jul 18, 09:05 UTCJul 18, 09:30 UTC25m
2026-07-17 AAR522 LHR → ICN Jul 17, 16:00 UTCJul 18, 03:10 UTC11h 11m
2026-07-16 AAR521 ICN → LHR Jul 16, 23:29 UTCJul 17, 13:05 UTC13h 35m
2026-07-16 AAR211 - Jul 16, 07:25 UTCJul 16, 18:44 UTC11h 20m
2026-07-15 AAR212 ICN → SFO Jul 15, 12:55 UTCJul 15, 23:30 UTC10h 35m
2026-07-15 AAR512 - Jul 15, 06:20 UTCJul 15, 06:40 UTC20m
2026-07-14 AAR512 - Jul 14, 19:35 UTCJul 15, 05:30 UTC9h 54m
2026-07-14 AAR511 - Jul 14, 04:25 UTCJul 14, 16:50 UTC12h 25m
2026-07-14 AAR511 - Jul 14, 03:10 UTCJul 14, 03:30 UTC20m
2026-07-13 AAR211 SFO → ICN Jul 13, 07:10 UTCJul 13, 18:25 UTC11h 15m
2026-07-12 AAR212 ICN → SFO Jul 12, 12:20 UTCJul 12, 22:50 UTC10h 30m
2026-07-11 AAR221 JFK → ICN Jul 11, 16:25 UTCJul 12, 06:45 UTC14h 20m
2026-07-10 AAR222 ICN → JFK Jul 10, 23:55 UTCJul 11, 13:20 UTC13h 25m
2026-07-10 AAR2151 - Jul 10, 02:40 UTCJul 10, 14:30 UTC11h 50m
2026-07-09 AAR212 ICN → SFO Jul 9, 13:35 UTCJul 9, 23:55 UTC10h 20m
2026-07-08 AAR221 JFK → ICN Jul 8, 16:15 UTCJul 9, 07:20 UTC15h 5m
2026-07-08 AAR222 - Jul 8, 00:15 UTCJul 8, 13:35 UTC13h 20m
2026-07-07 AAR105 - Jul 7, 11:00 UTCJul 7, 12:55 UTC1h 55m
2026-07-07 AAR106 - Jul 7, 07:00 UTCJul 7, 08:55 UTC1h 55m
2026-07-07 AAR502 - Jul 7, 04:35 UTCJul 7, 05:00 UTC25m
2026-07-06 AAR502 - Jul 6, 17:45 UTCJul 7, 03:45 UTC10h 0m
2026-07-06 AAR501 - Jul 6, 03:30 UTCJul 6, 15:30 UTC12h 0m
2026-07-06 AAR501 - Jul 6, 02:10 UTCJul 6, 02:35 UTC25m
2026-07-04 AAR221 JFK → ICN Jul 4, 17:15 UTCJul 5, 07:30 UTC14h 15m
2026-07-04 AAR222 - Jul 4, 00:00 UTCJul 4, 13:55 UTC13h 55m
2026-07-03 AAR211 - Jul 3, 07:00 UTCJul 3, 19:00 UTC12h 0m
2026-07-02 AAR212 ICN → SFO Jul 2, 12:25 UTCJul 2, 22:05 UTC9h 40m
2026-07-01 AAR221 JFK → ICN Jul 1, 16:15 UTCJul 2, 06:45 UTC14h 30m
2026-07-01 AAR222 - Jul 1, 00:10 UTCJul 1, 13:40 UTC13h 30m
2026-06-30 AAR752 SIN → ICN Jun 30, 18:10 UTCJun 30, 21:10 UTC3h 0m
2026-06-30 AAR752 SIN → ICN Jun 30, 15:05 UTCJun 30, 15:15 UTC10m
2026-06-30 AAR751 - Jun 30, 07:50 UTCJun 30, 13:15 UTC5h 25m
2026-06-30 AAR522 - Jun 30, 03:30 UTCJun 30, 03:50 UTC20m
2026-06-29 AAR522 - Jun 29, 16:00 UTCJun 30, 02:40 UTC10h 40m
2026-06-29 AAR521 ICN → LHR Jun 29, 00:44 UTCJun 29, 13:00 UTC12h 15m
2026-06-28 AAR521 ICN → LHR Jun 28, 23:29 UTCJun 28, 23:44 UTC15m
2026-06-27 AAR201 LAX → ICN Jun 27, 17:39 UTCJun 28, 06:24 UTC12h 45m
2026-06-27 AAR202 ICN → LAX Jun 27, 04:05 UTCJun 27, 14:25 UTC10h 20m
2026-06-26 AAR752 SIN → ICN Jun 26, 17:59 UTCJun 26, 20:59 UTC3h 0m
2026-06-26 AAR751 - Jun 26, 12:50 UTCJun 26, 13:19 UTC30m
2026-06-26 AAR751 - Jun 26, 07:39 UTCJun 26, 10:20 UTC2h 40m

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?
No active broadcast right now. Last signal was Jul 26, 15:25 UTC.
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.