Apparatus

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sensors Mode-S transponder

71BF01

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

Currently assigned to HL7701 · AIRBUS A-330-300

Hex
71BF01
Octal
34337401
Decimal
7,454,465
Country
KR
Tail
HL7701
Type
A333
No current signal · last broadcast Jul 24, 08:15 UTC
Flights observed
233
Distinct callsigns
20
Country
KR
Last broadcast
Jul 24, 08:15 UTC

Last known position

Most recent position reported by Mode-S 71BF01.

Country allocation

The ICAO 24-bit address 71BF01 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
KAL658 Korean Air 34 2026-06-28
KAL659 - 33 2026-07-23
KAL657 - 32 2026-06-28
KAL660 Korean Air 29 2026-07-24
KAL621 Korean Air 12 2026-07-21
KAL622 Korean Air 11 2026-07-22
KAL2041 - 11 2026-06-22
KAL836 - 8 2026-07-10
KAL2042 - 6 2026-06-23
KAL2001 Korean Air 5 2026-05-11
KAL624 - 4 2026-07-18
KAL623 - 4 2026-07-18
KAL2002 Korean Air 4 2026-05-11
KAL867 - 3 2026-06-30
KAL835 - 3 2026-07-10
KAL459 Korean Air 3 2026-06-12
KAL442 - 3 2026-06-20
KAL2011 Korean Air 3 2026-05-12
KAL888 Korean Air 2 2026-06-12
KAL868 Korean Air 2 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 KAL660 BKK → ICN Jul 24, 03:10 UTCJul 24, 08:15 UTC5h 5m
2026-07-23 KAL659 - Jul 23, 11:25 UTCJul 23, 16:35 UTC5h 10m
2026-07-23 KAL660 BKK → ICN Jul 23, 03:35 UTCJul 23, 08:40 UTC5h 5m
2026-07-22 KAL659 - Jul 22, 11:45 UTCJul 22, 16:50 UTC5h 5m
2026-07-22 KAL622 MNL → ICN Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-21 KAL621 ICN → MNL Jul 21, 23:15 UTCJul 22, 02:45 UTC3h 30m
2026-07-21 KAL660 BKK → ICN Jul 21, 03:15 UTCJul 21, 08:20 UTC5h 5m
2026-07-20 KAL659 ICN → BKK Jul 20, 11:40 UTCJul 20, 16:35 UTC4h 55m
2026-07-20 KAL622 - Jul 20, 04:50 UTCJul 20, 08:25 UTC3h 35m
2026-07-19 KAL621 ICN → MNL Jul 19, 23:30 UTCJul 20, 03:00 UTC3h 30m
2026-07-19 KAL788 - Jul 19, 01:50 UTCJul 19, 02:55 UTC1h 5m
2026-07-18 KAL787 - Jul 18, 23:15 UTCJul 18, 23:55 UTC40m
2026-07-18 KAL624 - Jul 18, 16:05 UTCJul 18, 19:30 UTC3h 25m
2026-07-18 KAL623 ICN → MNL Jul 18, 10:35 UTCJul 18, 14:00 UTC3h 25m
2026-07-18 KAL622 - Jul 18, 04:55 UTCJul 18, 08:30 UTC3h 35m
2026-07-17 KAL621 ICN → MNL Jul 17, 23:20 UTCJul 18, 02:40 UTC3h 20m
2026-07-17 KAL660 - Jul 17, 03:10 UTCJul 17, 08:25 UTC5h 15m
2026-07-16 KAL659 - Jul 16, 16:09 UTCJul 16, 16:25 UTC15m
2026-07-16 KAL659 - Jul 16, 11:25 UTCJul 16, 14:10 UTC2h 45m
2026-07-16 KAL622 - Jul 16, 04:50 UTCJul 16, 08:25 UTC3h 35m
2026-07-15 KAL621 - Jul 15, 23:10 UTCJul 16, 02:35 UTC3h 25m
2026-07-15 KAL660 - Jul 15, 03:10 UTCJul 15, 08:25 UTC5h 15m
2026-07-14 KAL659 - Jul 14, 16:05 UTCJul 14, 16:20 UTC15m
2026-07-14 KAL659 - Jul 14, 11:20 UTCJul 14, 14:20 UTC3h 0m
2026-07-14 KAL660 - Jul 14, 06:05 UTCJul 14, 09:00 UTC2h 55m
2026-07-14 KAL660 - Jul 14, 03:45 UTCJul 14, 04:00 UTC15m
2026-07-13 KAL659 - Jul 13, 16:00 UTCJul 13, 16:15 UTC15m
2026-07-13 KAL659 - Jul 13, 11:10 UTCJul 13, 14:00 UTC2h 50m
2026-07-13 KAL622 - Jul 13, 04:45 UTCJul 13, 08:15 UTC3h 30m
2026-07-12 KAL621 - Jul 12, 23:10 UTCJul 13, 02:35 UTC3h 25m
2026-07-12 KAL624 - Jul 12, 16:25 UTCJul 12, 20:01 UTC3h 35m
2026-07-12 KAL623 - Jul 12, 10:35 UTCJul 12, 14:40 UTC4h 5m
2026-07-12 KAL622 - Jul 12, 04:50 UTCJul 12, 08:20 UTC3h 30m
2026-07-11 KAL621 - Jul 11, 23:05 UTCJul 12, 02:30 UTC3h 25m
2026-07-11 KAL415 ICN → ICN Jul 11, 01:30 UTCJul 11, 11:35 UTC10h 5m
2026-07-10 KAL864 - Jul 10, 19:10 UTCJul 10, 19:30 UTC20m
2026-07-10 KAL863 - Jul 10, 13:05 UTCJul 10, 13:40 UTC35m
2026-07-10 KAL863 - Jul 10, 11:15 UTCJul 10, 11:35 UTC20m
2026-07-10 KAL836 - Jul 10, 07:35 UTCJul 10, 08:30 UTC55m
2026-07-10 KAL836 - Jul 10, 05:20 UTCJul 10, 05:30 UTC10m
2026-07-10 KAL835 - Jul 10, 00:10 UTCJul 10, 00:55 UTC45m
2026-07-09 KAL624 - Jul 9, 16:05 UTCJul 9, 19:25 UTC3h 20m
2026-07-09 KAL623 ICN → MNL Jul 9, 10:45 UTCJul 9, 14:10 UTC3h 25m
2026-07-09 KAL622 - Jul 9, 04:35 UTCJul 9, 08:05 UTC3h 30m
2026-07-09 KAL621 - Jul 9, 00:55 UTCJul 9, 02:50 UTC1h 55m
2026-07-08 KAL621 - Jul 8, 23:15 UTCJul 9, 00:00 UTC45m
2026-07-08 KAL660 - Jul 8, 03:15 UTCJul 8, 08:20 UTC5h 5m
2026-07-07 KAL659 ICN → BKK Jul 7, 11:00 UTCJul 7, 16:05 UTC5h 5m
2026-07-07 KAL622 - Jul 7, 05:05 UTCJul 7, 08:30 UTC3h 25m
2026-07-06 KAL621 - Jul 6, 23:45 UTCJul 7, 03:05 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 HL7701 page for operator, model, and routing details .

Mode-S 71BF01 frequently asked

What is Mode-S code 71BF01?
71BF01 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7701.
Where is Mode-S 71BF01 registered?
Mode-S code 71BF01 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 71BF01 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 08:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF01, octal 34337401, decimal 7,454,465.
What flights does 71BF01 operate?
Mode-S 71BF01 has broadcast 20 distinct callsigns, including KAL658, KAL659, KAL657, KAL660, KAL621.