Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71BF55

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

Currently assigned to HL7755 · BOEING 777-200

Hex
71BF55
Octal
34337525
Decimal
7,454,549
Country
KR
Tail
HL7755
Type
B772
No current signal · last broadcast 10d ago
Flights observed
103
Distinct callsigns
20
Country
KR
Last broadcast
10d ago

Last known position

Most recent position reported by Mode-S 71BF55.

Country allocation

The ICAO 24-bit address 71BF55 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
AAR703 Asiana Airlines 12 2026-05-10
AAR371 Asiana Airlines 12 2026-05-14
AAR372 Asiana Airlines 11 2026-05-14
AAR704 Asiana Airlines 10 2026-05-10
AAR602 Asiana Airlines 9 2026-05-02
AAR601 Asiana Airlines 9 2026-05-02
AAR562 Asiana Airlines 6 2026-04-22
AAR561 Asiana Airlines 4 2026-04-21
AAR232 Asiana Airlines 4 2026-04-24
AAR730 Asiana Airlines 3 2026-05-17
AAR712 Asiana Airlines 2 2026-05-19
AAR7113 Asiana Airlines 2 2026-05-19
AAR370 Asiana Airlines 2 2026-04-16
AAR334 Asiana Airlines 2 2026-04-27
AAR301 - 2 2026-05-15
AAR231 Asiana Airlines 2 2026-04-24
AAR729 Asiana Airlines 1 2026-05-13
AAR714 Asiana Airlines 1 2026-05-12
AAR713 Asiana Airlines 1 2026-05-12
AAR711 Asiana Airlines 1 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-19 AAR712 TPE → ICN May 19, 06:50 UTCMay 19, 08:50 UTC2h 0m
2026-05-19 AAR7113 ICN → TPE May 19, 03:40 UTCMay 19, 04:05 UTC25m
2026-05-19 AAR7113 ICN → TPE May 19, 02:05 UTCMay 19, 02:30 UTC25m
2026-05-17 AAR730 SGN → PUS May 17, 00:45 UTCMay 17, 10:35 UTC9h 50m
2026-05-16 AAR712 TPE → ICN May 16, 04:50 UTCMay 16, 07:01 UTC2h 11m
2026-05-16 AAR711 ICN → TPE May 16, 00:05 UTCMay 16, 02:05 UTC2h 0m
2026-05-15 AAR302 - May 15, 03:55 UTCMay 15, 04:15 UTC20m
2026-05-15 AAR301 - May 15, 00:45 UTCMay 15, 01:05 UTC20m
2026-05-14 AAR372 SZX → ICN May 14, 09:00 UTCMay 14, 09:35 UTC35m
2026-05-14 AAR372 SZX → ICN May 14, 06:35 UTCMay 14, 06:45 UTC10m
2026-05-14 - - May 14, 04:25 UTCMay 14, 04:45 UTC20m
2026-05-14 AAR371 ICN → SZX May 14, 01:30 UTCMay 14, 02:10 UTC40m
2026-05-13 AAR729 PUS → SGN May 13, 00:50 UTCMay 13, 10:20 UTC9h 30m
2026-05-12 AAR714 TPE → ICN May 12, 09:20 UTCMay 12, 11:25 UTC2h 5m
2026-05-12 AAR713 ICN → TPE May 12, 05:20 UTCMay 12, 07:25 UTC2h 5m
2026-05-11 AAR372 SZX → ICN May 11, 08:55 UTCMay 11, 09:40 UTC45m
2026-05-11 AAR372 SZX → ICN May 11, 06:50 UTCMay 11, 07:00 UTC10m
2026-05-11 AAR371 ICN → SZX May 11, 04:35 UTCMay 11, 04:55 UTC20m
2026-05-11 AAR371 ICN → SZX May 11, 01:30 UTCMay 11, 02:10 UTC40m
2026-05-10 AAR704 MNL → ICN May 10, 16:34 UTCMay 10, 20:00 UTC3h 25m
2026-05-10 AAR703 ICN → MNL May 10, 11:05 UTCMay 10, 14:40 UTC3h 35m
2026-05-10 AAR301 - May 10, 00:39 UTCMay 10, 00:55 UTC15m
2026-05-09 AAR704 MNL → ICN May 9, 16:25 UTCMay 9, 19:49 UTC3h 25m
2026-05-09 AAR703 ICN → MNL May 9, 10:55 UTCMay 9, 14:25 UTC3h 30m
2026-05-07 AAR730 SGN → PUS May 7, 00:45 UTCMay 7, 10:25 UTC9h 40m
2026-05-06 AAR704 MNL → ICN May 6, 16:05 UTCMay 6, 19:35 UTC3h 29m
2026-05-06 AAR703 ICN → MNL May 6, 11:00 UTCMay 6, 14:30 UTC3h 30m
2026-05-06 AAR360 HGH → ICN May 6, 04:05 UTCMay 6, 09:05 UTC5h 0m
2026-05-05 AAR372 SZX → ICN May 5, 09:10 UTCMay 5, 09:55 UTC45m
2026-05-05 AAR372 SZX → ICN May 5, 07:00 UTCMay 5, 07:10 UTC10m
2026-05-05 AAR371 ICN → SZX May 5, 04:50 UTCMay 5, 05:00 UTC10m
2026-05-05 AAR371 ICN → SZX May 5, 01:45 UTCMay 5, 02:25 UTC40m
2026-05-04 AAR704 MNL → ICN May 4, 16:15 UTCMay 4, 19:20 UTC3h 6m
2026-05-04 AAR703 ICN → MNL May 4, 10:50 UTCMay 4, 14:30 UTC3h 40m
2026-05-04 AAR363 ICN → PVG May 4, 02:10 UTCMay 4, 07:15 UTC5h 5m
2026-05-02 AAR602 SYD → ICN May 2, 23:50 UTCMay 3, 09:45 UTC9h 54m
2026-05-02 AAR601 ICN → SYD May 2, 11:50 UTCMay 2, 21:45 UTC9h 55m
2026-05-01 AAR602 SYD → ICN May 1, 23:45 UTCMay 2, 09:55 UTC10h 11m
2026-05-01 AAR601 ICN → SYD May 1, 11:50 UTCMay 1, 21:35 UTC9h 45m
2026-05-01 AAR372 SZX → ICN May 1, 09:05 UTCMay 1, 09:50 UTC45m
2026-05-01 AAR371 ICN → SZX May 1, 01:30 UTCMay 1, 02:05 UTC35m
2026-04-30 AAR602 SYD → ICN Apr 30, 00:20 UTCApr 30, 10:25 UTC10h 5m
2026-04-29 AAR601 ICN → SYD Apr 29, 12:40 UTCApr 29, 22:25 UTC9h 45m
2026-04-29 AAR372 SZX → ICN Apr 29, 10:05 UTCApr 29, 10:40 UTC35m
2026-04-29 AAR371 ICN → SZX Apr 29, 04:55 UTCApr 29, 05:20 UTC25m
2026-04-29 AAR371 ICN → SZX Apr 29, 01:45 UTCApr 29, 02:24 UTC40m
2026-04-27 AAR602 SYD → ICN Apr 27, 23:45 UTCApr 28, 10:15 UTC10h 30m
2026-04-27 AAR601 ICN → SYD Apr 27, 20:25 UTCApr 27, 21:35 UTC1h 10m
2026-04-27 AAR601 ICN → SYD Apr 27, 11:45 UTCApr 27, 12:30 UTC45m
2026-04-27 AAR334 PEK → ICN Apr 27, 08:55 UTCApr 27, 09:15 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 HL7755 page for operator, model, and routing details .

Mode-S 71BF55 frequently asked

What is Mode-S code 71BF55?
71BF55 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7755.
Where is Mode-S 71BF55 registered?
Mode-S code 71BF55 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 71BF55 broadcasting right now?
No active broadcast right now. Last signal was 10d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF55, octal 34337525, decimal 7,454,549.
What flights does 71BF55 operate?
Mode-S 71BF55 has broadcast 20 distinct callsigns, including AAR703, AAR371, AAR372, AAR704, AAR602.