Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71BF09

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

Currently assigned to HL7709 · AIRBUS A-330-300

Hex
71BF09
Octal
34337411
Decimal
7,454,473
Country
KR
Tail
HL7709
Type
A333
No current signal · last broadcast 19h ago
Flights observed
337
Distinct callsigns
20
Country
KR
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S 71BF09.

Country allocation

The ICAO 24-bit address 71BF09 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
KAL836 - 41 2026-07-13
KAL835 - 30 2026-07-13
KAL864 - 21 2026-07-06
KAL2027 - 21 2026-07-02
KAL2028 - 16 2026-07-02
KAL863 - 15 2026-07-06
KAL831 - 14 2026-07-11
KAL832 - 12 2026-07-12
KAL441 Korean Air 10 2026-07-05
KAL442 - 9 2026-07-06
KAL2105 Korean Air 8 2026-06-04
KAL1246 Korean Air 8 2026-06-04
KAL2106 Korean Air 7 2026-06-05
KAL1312 Korean Air 7 2026-06-05
KAL1177 Korean Air 7 2026-06-05
KAL1121 Korean Air 7 2026-06-04
KAL1113 Korean Air 7 2026-06-05
KAL1055 Korean Air 7 2026-06-04
KAL843 Korean Air 6 2026-05-14
KAL744 Korean Air 6 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KAL836 - Jul 13, 07:25 UTCJul 13, 08:05 UTC40m
2026-07-13 KAL836 - Jul 13, 05:05 UTCJul 13, 05:15 UTC10m
2026-07-13 KAL835 - Jul 13, 02:45 UTCJul 13, 03:05 UTC20m
2026-07-13 KAL835 - Jul 13, 00:10 UTCJul 13, 00:50 UTC40m
2026-07-12 KAL499P GMP → ICN Jul 12, 21:25 UTCJul 12, 21:40 UTC15m
2026-07-12 KAL1374 - Jul 12, 12:25 UTCJul 12, 13:01 UTC35m
2026-07-12 KAL1371 - Jul 12, 09:55 UTCJul 12, 10:30 UTC35m
2026-07-12 KAL1372 - Jul 12, 08:05 UTCJul 12, 08:40 UTC35m
2026-07-12 KAL299P - Jul 12, 05:35 UTCJul 12, 06:10 UTC35m
2026-07-12 KAL832 - Jul 12, 03:40 UTCJul 12, 04:01 UTC20m
2026-07-11 KAL831 - Jul 11, 23:25 UTCJul 11, 23:50 UTC25m
2026-07-11 KAL887 - Jul 11, 02:30 UTCJul 11, 07:20 UTC4h 50m
2026-07-10 KAL876 - Jul 10, 13:15 UTCJul 10, 13:30 UTC15m
2026-07-10 KAL875 - Jul 10, 10:00 UTCJul 10, 10:25 UTC25m
2026-07-10 KAL832 - Jul 10, 03:45 UTCJul 10, 04:05 UTC20m
2026-07-09 KAL831 - Jul 9, 23:20 UTCJul 9, 23:45 UTC25m
2026-07-09 KAL2012 - Jul 9, 17:15 UTCJul 9, 20:10 UTC2h 55m
2026-07-09 KAL2011 - Jul 9, 11:05 UTCJul 9, 14:10 UTC3h 5m
2026-07-09 KAL836 - Jul 9, 07:15 UTCJul 9, 08:00 UTC45m
2026-07-09 KAL836 - Jul 9, 05:05 UTCJul 9, 05:15 UTC10m
2026-07-09 KAL835 - Jul 9, 03:10 UTCJul 9, 03:20 UTC10m
2026-07-09 KAL835 - Jul 9, 00:15 UTCJul 9, 01:00 UTC45m
2026-07-08 KAL459 ICN → ICN Jul 8, 09:45 UTCJul 8, 20:05 UTC10h 20m
2026-07-08 KAL832 - Jul 8, 03:35 UTCJul 8, 04:00 UTC25m
2026-07-07 KAL831 - Jul 7, 23:25 UTCJul 7, 23:50 UTC25m
2026-07-07 KAL836 - Jul 7, 13:05 UTCJul 7, 13:45 UTC40m
2026-07-07 KAL836 - Jul 7, 10:55 UTCJul 7, 11:05 UTC10m
2026-07-07 KAL835 - Jul 7, 00:10 UTCJul 7, 00:55 UTC45m
2026-07-06 KAL864 - Jul 6, 19:05 UTCJul 6, 19:30 UTC25m
2026-07-06 KAL863 - Jul 6, 11:30 UTCJul 6, 11:55 UTC25m
2026-07-06 KAL442 - Jul 6, 09:05 UTCJul 6, 09:45 UTC40m
2026-07-06 KAL442 - Jul 6, 05:55 UTCJul 6, 06:05 UTC10m
2026-07-05 KAL441 ICN → HAN Jul 5, 23:35 UTCJul 6, 00:20 UTC45m
2026-07-05 KAL888 ICN → ICN Jul 5, 02:50 UTCJul 5, 07:55 UTC5h 5m
2026-07-04 KAL832 - Jul 4, 05:55 UTCJul 4, 06:15 UTC20m
2026-07-03 KAL831 - Jul 3, 23:25 UTCJul 3, 23:45 UTC20m
2026-07-03 KAL864 - Jul 3, 18:55 UTCJul 3, 19:15 UTC20m
2026-07-03 KAL863 - Jul 3, 11:20 UTCJul 3, 11:35 UTC15m
2026-07-03 KAL836 - Jul 3, 07:30 UTCJul 3, 08:15 UTC45m
2026-07-03 KAL836 - Jul 3, 05:15 UTCJul 3, 05:25 UTC10m
2026-07-03 KAL835 - Jul 3, 03:00 UTCJul 3, 03:10 UTC10m
2026-07-03 KAL835 - Jul 3, 00:00 UTCJul 3, 00:40 UTC40m
2026-07-02 KAL2028 TPE → ICN Jul 2, 11:10 UTCJul 2, 13:05 UTC1h 55m
2026-07-02 KAL2027 ICN → TPE Jul 2, 07:30 UTCJul 2, 09:45 UTC2h 15m
2026-07-02 KAL832 - Jul 2, 03:40 UTCJul 2, 04:00 UTC20m
2026-07-01 KAL831 - Jul 1, 23:30 UTCJul 1, 23:50 UTC20m
2026-07-01 KAL2028 TPE → ICN Jul 1, 11:10 UTCJul 1, 13:05 UTC1h 55m
2026-07-01 KAL2027 - Jul 1, 09:10 UTCJul 1, 09:40 UTC30m
2026-07-01 KAL2027 - Jul 1, 07:30 UTCJul 1, 08:05 UTC35m
2026-07-01 KAL832 - Jul 1, 03:20 UTCJul 1, 03:40 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 HL7709 page for operator, model, and routing details .

Mode-S 71BF09 frequently asked

What is Mode-S code 71BF09?
71BF09 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL7709.
Where is Mode-S 71BF09 registered?
Mode-S code 71BF09 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 71BF09 broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71BF09, octal 34337411, decimal 7,454,473.
What flights does 71BF09 operate?
Mode-S 71BF09 has broadcast 20 distinct callsigns, including KAL836, KAL835, KAL864, KAL2027, KAL2028.