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 1h ago
Flights observed
104
Distinct callsigns
17
Country
KR
Last broadcast
1h ago

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 17 distinct

Callsign Airline Flights Last seen
AAR551 Asiana Airlines 15 2026-05-28
AAR703 Asiana Airlines 14 2026-05-25
AAR552 Asiana Airlines 14 2026-05-29
AAR704 Asiana Airlines 12 2026-05-25
AAR562 Asiana Airlines 12 2026-05-29
AAR561 Asiana Airlines 12 2026-05-29
AAR602 Asiana Airlines 6 2026-05-26
AAR601 Asiana Airlines 6 2026-05-26
AAR359 Asiana Airlines 2 2026-05-26
AAR272 Asiana Airlines 2 2026-05-11
AAR271 Asiana Airlines 2 2026-05-12
AAR730 Asiana Airlines 1 2026-04-19
AAR714 Asiana Airlines 1 2026-05-10
AAR713 Asiana Airlines 1 2026-05-10
AAR364 - 1 2026-04-14
AAR361 Asiana Airlines 1 2026-05-07
AAR360 Asiana Airlines 1 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AAR562 FCO → ICN May 29, 20:20 UTCMay 29, 23:40 UTC3h 20m
2026-05-29 AAR561 ICN → FCO May 29, 06:30 UTCMay 29, 18:05 UTC11h 35m
2026-05-29 AAR561 ICN → FCO May 29, 05:10 UTCMay 29, 05:25 UTC15m
2026-05-29 AAR552 IST → ICN May 29, 00:30 UTCMay 29, 00:50 UTC20m
2026-05-28 AAR552 IST → ICN May 28, 15:40 UTCMay 28, 23:50 UTC8h 10m
2026-05-28 AAR551 ICN → IST May 28, 13:35 UTCMay 28, 13:50 UTC15m
2026-05-28 AAR551 ICN → IST May 28, 03:25 UTCMay 28, 12:45 UTC9h 20m
2026-05-28 AAR551 ICN → IST May 28, 02:05 UTCMay 28, 02:20 UTC15m
2026-05-26 AAR602 SYD → ICN May 26, 23:49 UTCMay 27, 10:10 UTC10h 21m
2026-05-26 AAR601 ICN → SYD May 26, 11:30 UTCMay 26, 20:50 UTC9h 20m
2026-05-26 AAR359 ICN → HGH May 26, 03:55 UTCMay 26, 09:25 UTC5h 30m
2026-05-25 AAR704 MNL → ICN May 25, 16:25 UTCMay 25, 19:40 UTC3h 15m
2026-05-25 AAR703 ICN → MNL May 25, 10:40 UTCMay 25, 14:00 UTC3h 20m
2026-05-25 AAR562 FCO → ICN May 25, 06:40 UTCMay 25, 07:00 UTC20m
2026-05-24 AAR562 FCO → ICN May 24, 19:50 UTCMay 24, 23:35 UTC3h 45m
2026-05-24 AAR561 ICN → FCO May 24, 13:55 UTCMay 24, 17:55 UTC4h 0m
2026-05-24 AAR561 ICN → FCO May 24, 04:50 UTCMay 24, 05:10 UTC20m
2026-05-23 AAR562 FCO → ICN May 23, 06:25 UTCMay 23, 06:45 UTC20m
2026-05-22 AAR562 FCO → ICN May 22, 19:45 UTCMay 22, 23:30 UTC3h 45m
2026-05-22 AAR561 ICN → FCO May 22, 05:15 UTCMay 22, 17:40 UTC12h 25m
2026-05-22 AAR552 IST → ICN May 22, 00:30 UTCMay 22, 00:50 UTC20m
2026-05-21 AAR552 IST → ICN May 21, 15:25 UTCMay 21, 23:50 UTC8h 25m
2026-05-21 AAR551 ICN → IST May 21, 13:10 UTCMay 21, 13:20 UTC10m
2026-05-21 AAR551 ICN → IST May 21, 01:45 UTCMay 21, 12:20 UTC10h 35m
2026-05-20 AAR704 MNL → ICN May 20, 16:15 UTCMay 20, 19:40 UTC3h 25m
2026-05-20 AAR703 ICN → MNL May 20, 10:55 UTCMay 20, 14:30 UTC3h 35m
2026-05-20 AAR552 IST → ICN May 20, 00:30 UTCMay 20, 00:55 UTC25m
2026-05-19 AAR552 IST → ICN May 19, 16:10 UTCMay 19, 23:35 UTC7h 25m
2026-05-19 AAR552 IST → ICN May 19, 15:25 UTCMay 19, 15:35 UTC10m
2026-05-19 AAR551 ICN → IST May 19, 03:10 UTCMay 19, 12:00 UTC8h 50m
2026-05-19 AAR551 ICN → IST May 19, 01:50 UTCMay 19, 02:15 UTC25m
2026-05-18 AAR602 SYD → ICN May 18, 00:15 UTCMay 18, 10:40 UTC10h 25m
2026-05-17 AAR601 ICN → SYD May 17, 12:05 UTCMay 17, 22:01 UTC9h 55m
2026-05-17 AAR602 SYD → ICN May 17, 00:10 UTCMay 17, 10:10 UTC10h 0m
2026-05-16 AAR601 ICN → SYD May 16, 12:01 UTCMay 16, 22:00 UTC9h 59m
2026-05-15 AAR602 SYD → ICN May 15, 23:50 UTCMay 16, 10:11 UTC10h 21m
2026-05-15 AAR601 ICN → SYD May 15, 11:35 UTCMay 15, 21:35 UTC9h 59m
2026-05-15 AAR360 HGH → ICN May 15, 04:10 UTCMay 15, 09:20 UTC5h 10m
2026-05-13 AAR602 SYD → ICN May 13, 23:50 UTCMay 14, 10:31 UTC10h 40m
2026-05-13 AAR601 ICN → SYD May 13, 11:35 UTCMay 13, 20:55 UTC9h 20m
2026-05-12 AAR271 SEA → ICN May 12, 07:15 UTCMay 12, 17:55 UTC10h 40m
2026-05-11 AAR272 ICN → SEA May 11, 12:45 UTCMay 11, 22:15 UTC9h 30m
2026-05-10 AAR714 TPE → ICN May 10, 09:15 UTCMay 10, 11:15 UTC2h 0m
2026-05-10 AAR713 ICN → TPE May 10, 05:20 UTCMay 10, 07:30 UTC2h 10m
2026-05-09 AAR551 ICN → IST May 9, 05:30 UTCMay 9, 19:19 UTC13h 50m
2026-05-09 AAR552 IST → ICN May 9, 02:00 UTCMay 9, 02:15 UTC15m
2026-05-08 AAR552 IST → ICN May 8, 12:14 UTCMay 9, 01:05 UTC12h 50m
2026-05-08 AAR551 ICN → IST May 8, 04:34 UTCMay 9, 01:05 UTC20h 30m
2026-05-08 AAR551 ICN → IST May 8, 03:14 UTCMay 8, 03:24 UTC10m
2026-05-07 AAR704 MNL → ICN May 7, 16:05 UTCMay 7, 19:25 UTC3h 20m

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 1h ago.
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 17 distinct callsigns, including AAR551, AAR703, AAR552, AAR704, AAR562.