Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71BF56

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

Currently assigned to HL7756 · BOEING 777-200

Hex
71BF56
Octal
34337526
Decimal
7,454,550
Country
KR
Tail
HL7756
Type
B772
No current signal · last broadcast Jul 26, 14:50 UTC
Flights observed
178
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 14:50 UTC

Last known position

Most recent position reported by Mode-S 71BF56.

Country allocation

The ICAO 24-bit address 71BF56 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 - 22 2026-07-22
AAR704 - 20 2026-07-22
AAR562 Asiana Airlines 15 2026-06-05
AAR551 Asiana Airlines 15 2026-05-28
AAR552 Asiana Airlines 14 2026-05-29
AAR561 Asiana Airlines 13 2026-06-04
AAR602 Asiana Airlines 8 2026-06-05
AAR601 Asiana Airlines 8 2026-06-05
AAR711 - 7 2026-07-12
AAR712 - 5 2026-07-12
AAR359 Asiana Airlines 5 2026-07-20
AAR734 Asiana Airlines 4 2026-07-21
AAR733 - 4 2026-07-21
AAR334 - 4 2026-07-14
AAR713 - 3 2026-06-26
AAR360 Asiana Airlines 3 2026-07-20
AAR174 Asiana Airlines 3 2026-07-19
AAR173 - 3 2026-07-19
AAR730 Asiana Airlines 2 2026-05-31
AAR714 - 2 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR370 CAN → ICN Jul 26, 11:25 UTCJul 26, 14:45 UTC3h 20m
2026-07-26 AAR369 ICN → CAN Jul 26, 09:05 UTCJul 26, 09:15 UTC10m
2026-07-26 AAR369 ICN → CAN Jul 26, 06:05 UTCJul 26, 08:30 UTC2h 26m
2026-07-23 AAR364 PVG → ICN Jul 23, 02:05 UTCJul 23, 08:35 UTC6h 30m
2026-07-22 AAR704 - Jul 22, 16:15 UTCJul 22, 19:30 UTC3h 15m
2026-07-22 AAR703 - Jul 22, 11:10 UTCJul 22, 14:05 UTC2h 55m
2026-07-21 AAR734 HAN → ICN Jul 21, 20:05 UTCJul 21, 20:45 UTC40m
2026-07-21 AAR733 - Jul 21, 15:00 UTCJul 21, 15:10 UTC10m
2026-07-21 AAR733 - Jul 21, 11:40 UTCJul 21, 12:15 UTC35m
2026-07-21 AAR370 ICN → ICN Jul 21, 00:50 UTCJul 21, 09:20 UTC8h 30m
2026-07-20 AAR360 HGH → ICN Jul 20, 08:50 UTCJul 20, 09:35 UTC45m
2026-07-20 AAR359 ICN → HGH Jul 20, 04:00 UTCJul 20, 04:40 UTC40m
2026-07-19 AAR734 HAN → ICN Jul 19, 19:50 UTCJul 19, 20:30 UTC40m
2026-07-19 AAR734 HAN → ICN Jul 19, 16:50 UTCJul 19, 17:00 UTC10m
2026-07-19 AAR733 - Jul 19, 10:50 UTCJul 19, 13:40 UTC2h 50m
2026-07-19 AAR173 - Jul 19, 05:50 UTCJul 19, 08:10 UTC2h 20m
2026-07-19 AAR174 ICN → CTS Jul 19, 01:55 UTCJul 19, 04:20 UTC2h 25m
2026-07-18 AAR704 - Jul 18, 16:20 UTCJul 18, 19:45 UTC3h 25m
2026-07-18 AAR703 ICN → MNL Jul 18, 10:50 UTCJul 18, 14:15 UTC3h 25m
2026-07-18 AAR173 - Jul 18, 05:45 UTCJul 18, 08:05 UTC2h 20m
2026-07-18 AAR174 ICN → CTS Jul 18, 01:45 UTCJul 18, 04:05 UTC2h 21m
2026-07-17 AAR173 - Jul 17, 05:50 UTCJul 17, 08:10 UTC2h 20m
2026-07-17 AAR174 ICN → CTS Jul 17, 01:45 UTCJul 17, 04:04 UTC2h 20m
2026-07-15 AAR734 - Jul 15, 01:00 UTCJul 15, 01:40 UTC40m
2026-07-14 AAR733 - Jul 14, 16:30 UTCJul 14, 17:10 UTC40m
2026-07-14 AAR334 - Jul 14, 09:00 UTCJul 14, 09:35 UTC35m
2026-07-14 AAR334 - Jul 14, 08:00 UTCJul 14, 08:10 UTC10m
2026-07-14 AAR333 - Jul 14, 04:15 UTCJul 14, 04:40 UTC25m
2026-07-13 AAR359 ICN → ICN Jul 13, 04:00 UTCJul 13, 09:25 UTC5h 25m
2026-07-12 AAR712 TPE → ICN Jul 12, 04:40 UTCJul 12, 06:50 UTC2h 10m
2026-07-12 AAR711 - Jul 12, 01:35 UTCJul 12, 02:10 UTC35m
2026-07-11 AAR711 - Jul 11, 23:55 UTCJul 12, 00:35 UTC40m
2026-07-11 AAR704 - Jul 11, 16:45 UTCJul 11, 20:15 UTC3h 30m
2026-07-11 AAR703 - Jul 11, 11:20 UTCJul 11, 15:10 UTC3h 50m
2026-07-11 AAR361 ICN → ICN Jul 11, 00:25 UTCJul 11, 05:20 UTC4h 55m
2026-07-10 AAR712 TPE → ICN Jul 10, 04:50 UTCJul 10, 06:55 UTC2h 5m
2026-07-10 AAR711 ICN → TPE Jul 10, 00:00 UTCJul 10, 02:00 UTC2h 0m
2026-07-05 AAR360 - Jul 5, 04:00 UTCJul 5, 09:20 UTC5h 20m
2026-07-02 AAR704 - Jul 2, 16:10 UTCJul 2, 19:25 UTC3h 15m
2026-07-02 AAR703 ICN → MNL Jul 2, 11:05 UTCJul 2, 14:40 UTC3h 35m
2026-07-02 AAR101 - Jul 2, 06:15 UTCJul 2, 06:35 UTC20m
2026-07-02 AAR101 - Jul 2, 04:35 UTCJul 2, 05:40 UTC1h 5m
2026-07-01 AAR102 ICN → NRT Jul 1, 23:50 UTCJul 2, 01:40 UTC1h 50m
2026-06-29 AAR704 MNL → ICN Jun 29, 16:10 UTCJun 29, 19:29 UTC3h 20m
2026-06-29 AAR703 - Jun 29, 10:44 UTCJun 29, 14:19 UTC3h 35m
2026-06-28 AAR712 TPE → ICN Jun 28, 04:50 UTCJun 28, 06:49 UTC2h 0m
2026-06-28 AAR711 - Jun 28, 01:50 UTCJun 28, 02:05 UTC15m
2026-06-28 AAR711 - Jun 28, 00:00 UTCJun 28, 00:39 UTC40m
2026-06-26 AAR714 - Jun 26, 09:14 UTCJun 26, 11:09 UTC1h 55m
2026-06-26 AAR713 - Jun 26, 07:30 UTCJun 26, 07:50 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 HL7756 page for operator, model, and routing details .

Mode-S 71BF56 frequently asked

What is Mode-S code 71BF56?
71BF56 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7756.
Where is Mode-S 71BF56 registered?
Mode-S code 71BF56 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 71BF56 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF56, octal 34337526, decimal 7,454,550.
What flights does 71BF56 operate?
Mode-S 71BF56 has broadcast 20 distinct callsigns, including AAR703, AAR704, AAR562, AAR551, AAR552.