Apparatus

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sensors Mode-S transponder

71C391

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

Currently assigned to HL8391 · BOEING 787-9 Dreamliner

Hex
71C391
Octal
34341621
Decimal
7,455,633
Country
KR
Tail
HL8391
Type
B789
Broadcasting now · callsign KAL032 · 35,975 ft
Flights observed
234
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 22:15 UTC

Current position

71C391 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C391 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
KAL922 Korean Air 15 2026-07-26
KAL921 Korean Air 12 2026-07-26
KAL498 - 10 2026-06-29
KAL956 Korean Air 9 2026-07-21
KAL468 Korean Air 9 2026-07-24
KAL032 - 9 2026-07-16
KAL031 - 9 2026-07-16
KAL472 - 8 2026-07-15
KAL471 - 8 2026-06-26
KAL964 - 7 2026-07-03
KAL955 - 7 2026-07-20
KAL918 Korean Air 6 2026-05-22
KAL914 Korean Air 6 2026-07-24
KAL696 Korean Air 6 2026-07-25
KAL678 Korean Air 6 2026-07-22
KAL497 - 6 2026-06-29
KAL963 - 5 2026-07-02
KAL913 Korean Air 5 2026-07-23
KAL677 - 5 2026-07-09
KAL917 Korean Air 4 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL922 LIS → ICN Jul 26, 21:55 UTCJul 26, 22:15 UTC20m
2026-07-26 KAL921 ICN → LIS Jul 26, 04:05 UTCJul 26, 18:20 UTC14h 16m
2026-07-25 KAL696 KTM → ICN Jul 25, 19:00 UTCJul 25, 19:25 UTC25m
2026-07-25 KAL696 KTM → ICN Jul 25, 13:50 UTCJul 25, 15:40 UTC1h 50m
2026-07-25 KAL695 ICN → KTM Jul 25, 05:35 UTCJul 25, 11:35 UTC6h 0m
2026-07-24 KAL468 CXR → ICN Jul 24, 22:00 UTCJul 24, 22:25 UTC25m
2026-07-24 KAL467 ICN → CNX Jul 24, 11:40 UTCJul 24, 19:15 UTC7h 35m
2026-07-24 KAL914 MAD → ICN Jul 24, 06:20 UTCJul 24, 06:40 UTC20m
2026-07-23 KAL914 MAD → ICN Jul 23, 19:00 UTCJul 24, 05:30 UTC10h 30m
2026-07-23 KAL913 ICN → MAD Jul 23, 02:35 UTCJul 23, 15:30 UTC12h 55m
2026-07-23 KAL913 ICN → MAD Jul 23, 01:20 UTCJul 23, 01:45 UTC25m
2026-07-22 KAL678 HKT → ICN Jul 22, 11:10 UTCJul 22, 22:30 UTC11h 20m
2026-07-22 KAL165 ICN → WUH Jul 22, 00:35 UTCJul 22, 00:55 UTC20m
2026-07-21 KAL492 RGN → ICN Jul 21, 15:30 UTCJul 21, 20:40 UTC5h 10m
2026-07-21 KAL491 ICN → RGN Jul 21, 07:15 UTCJul 21, 12:05 UTC4h 50m
2026-07-21 KAL956 IST → ICN Jul 21, 03:05 UTCJul 21, 03:25 UTC20m
2026-07-20 KAL956 IST → ICN Jul 20, 20:20 UTCJul 21, 02:15 UTC5h 55m
2026-07-20 KAL956 IST → ICN Jul 20, 18:40 UTCJul 20, 19:10 UTC30m
2026-07-20 KAL955 - Jul 20, 15:50 UTCJul 20, 16:10 UTC20m
2026-07-20 KAL955 - Jul 20, 05:15 UTCJul 20, 15:10 UTC9h 55m
2026-07-20 KAL788 FUK → ICN Jul 20, 02:05 UTCJul 20, 03:00 UTC55m
2026-07-19 KAL787 - Jul 19, 23:30 UTCJul 20, 00:15 UTC45m
2026-07-19 KAL726 KIX → ICN Jul 19, 09:40 UTCJul 19, 10:50 UTC1h 10m
2026-07-19 KAL725 ICN → KIX Jul 19, 06:30 UTCJul 19, 08:00 UTC1h 30m
2026-07-19 KAL956 IST → ICN Jul 19, 03:10 UTCJul 19, 03:45 UTC35m
2026-07-18 KAL956 IST → ICN Jul 18, 18:35 UTCJul 19, 02:15 UTC7h 40m
2026-07-18 KAL955 - Jul 18, 06:10 UTCJul 18, 14:50 UTC8h 40m
2026-07-18 KAL955 - Jul 18, 05:00 UTCJul 18, 05:20 UTC20m
2026-07-17 KAL468 ICN → ICN Jul 17, 12:10 UTCJul 17, 22:49 UTC10h 40m
2026-07-16 KAL032 DFW → ICN Jul 16, 17:49 UTCJul 17, 07:20 UTC13h 30m
2026-07-16 KAL031 ICN → DFW Jul 16, 00:50 UTCJul 16, 13:40 UTC12h 50m
2026-07-15 KAL472 ICN → ICN Jul 15, 01:05 UTCJul 15, 12:10 UTC11h 5m
2026-07-14 KAL696 - Jul 14, 18:55 UTCJul 14, 19:20 UTC25m
2026-07-14 KAL696 - Jul 14, 13:30 UTCJul 14, 15:25 UTC1h 55m
2026-07-14 KAL695 - Jul 14, 05:25 UTCJul 14, 11:10 UTC5h 45m
2026-07-14 KAL788 - Jul 14, 01:55 UTCJul 14, 03:00 UTC1h 5m
2026-07-13 KAL787 - Jul 13, 23:30 UTCJul 14, 00:15 UTC45m
2026-07-13 KAL8054 - Jul 13, 01:10 UTCJul 13, 10:25 UTC9h 15m
2026-07-12 KAL8053 - Jul 12, 22:00 UTCJul 12, 22:30 UTC30m
2026-07-12 KAL8053 - Jul 12, 14:10 UTCJul 12, 16:15 UTC2h 5m
2026-07-12 KAL8054 - Jul 12, 07:40 UTCJul 12, 10:05 UTC2h 25m
2026-07-12 KAL8054 - Jul 12, 00:50 UTCJul 12, 01:05 UTC15m
2026-07-11 KAL8053 - Jul 11, 14:10 UTCJul 11, 22:15 UTC8h 5m
2026-07-11 KAL922 - Jul 11, 10:05 UTCJul 11, 10:25 UTC20m
2026-07-10 KAL922 - Jul 10, 22:00 UTCJul 11, 09:00 UTC11h 0m
2026-07-10 KAL921 - Jul 10, 05:25 UTCJul 10, 19:05 UTC13h 40m
2026-07-10 KAL921 - Jul 10, 04:20 UTCJul 10, 04:35 UTC15m
2026-07-09 KAL677 ICN → ICN Jul 9, 09:30 UTCJul 9, 23:05 UTC13h 35m
2026-07-08 KAL480 - Jul 8, 11:10 UTCJul 9, 06:00 UTC18h 50m
2026-07-08 KAL706 - Jul 8, 00:30 UTCJul 8, 02:20 UTC1h 50m

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 HL8391 page for operator, model, and routing details .

Mode-S 71C391 frequently asked

What is Mode-S code 71C391?
71C391 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8391.
Where is Mode-S 71C391 registered?
Mode-S code 71C391 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 71C391 broadcasting right now?
Yes. Mode-S 71C391 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C391, octal 34341621, decimal 7,455,633.
What flights does 71C391 operate?
Mode-S 71C391 has broadcast 20 distinct callsigns, including KAL922, KAL921, KAL498, KAL956, KAL468.