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
No current signal · last broadcast 1h ago
Flights observed
200
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C391.

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 - 14 2026-07-11
KAL921 - 11 2026-07-10
KAL498 - 10 2026-06-29
KAL471 - 8 2026-06-26
KAL032 Korean Air 8 2026-07-06
KAL031 - 8 2026-07-06
KAL964 - 7 2026-07-03
KAL472 - 7 2026-06-17
KAL468 Korean Air 7 2026-06-19
KAL918 Korean Air 6 2026-05-22
KAL497 - 6 2026-06-29
KAL963 - 5 2026-07-02
KAL678 Korean Air 5 2026-05-22
KAL677 - 5 2026-07-09
KAL956 - 4 2026-06-21
KAL917 Korean Air 4 2026-05-21
KAL914 - 4 2026-07-01
KAL647 Korean Air 4 2026-05-07
KAL480 - 4 2026-07-08
KAL432 Korean Air 4 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL695 - Jul 14, 05:25 UTCJul 14, 06:05 UTC40m
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
2026-07-07 KAL705 ICN → NRT Jul 7, 10:00 UTCJul 7, 11:50 UTC1h 50m
2026-07-06 KAL032 DFW → ICN Jul 6, 17:40 UTCJul 7, 07:15 UTC13h 35m
2026-07-06 KAL031 - Jul 6, 01:20 UTCJul 6, 13:30 UTC12h 10m
2026-07-04 KAL408 BNE → ICN Jul 4, 23:10 UTCJul 5, 08:40 UTC9h 30m
2026-07-04 KAL407 ICN → BNE Jul 4, 11:30 UTCJul 4, 20:15 UTC8h 45m
2026-07-04 KAL2022 TPE → ICN Jul 4, 05:30 UTCJul 4, 07:30 UTC2h 0m
2026-07-04 KAL2021 ICN → TPE Jul 4, 01:50 UTCJul 4, 03:45 UTC1h 55m
2026-07-03 KAL431 ICN → ICN Jul 3, 07:35 UTCJul 3, 22:40 UTC15h 5m
2026-07-03 KAL964 - Jul 3, 04:20 UTCJul 3, 04:40 UTC20m
2026-07-02 KAL964 - Jul 2, 18:35 UTCJul 3, 03:25 UTC8h 50m
2026-07-02 KAL963 ICN → BUD Jul 2, 04:25 UTCJul 2, 16:05 UTC11h 40m
2026-07-01 KAL914 - Jul 1, 06:30 UTCJul 1, 06:50 UTC20m
2026-06-30 KAL914 - Jun 30, 18:50 UTCJul 1, 05:35 UTC10h 45m
2026-06-30 KAL913 - Jun 30, 02:40 UTCJun 30, 15:30 UTC12h 50m
2026-06-30 KAL913 - Jun 30, 01:30 UTCJun 30, 01:40 UTC10m
2026-06-29 KAL498 - Jun 29, 20:04 UTCJun 29, 20:24 UTC20m
2026-06-29 KAL498 - Jun 29, 13:44 UTCJun 29, 16:25 UTC2h 40m
2026-06-29 KAL497 ICN → DEL Jun 29, 04:25 UTCJun 29, 11:20 UTC6h 55m
2026-06-28 KAL498 - Jun 28, 20:09 UTCJun 28, 20:34 UTC25m
2026-06-28 KAL498 - Jun 28, 14:09 UTCJun 28, 16:49 UTC2h 40m
2026-06-28 KAL497 ICN → DEL Jun 28, 04:25 UTCJun 28, 11:19 UTC6h 55m
2026-06-27 KAL076 YVR → ICN Jun 27, 08:10 UTCJun 27, 18:49 UTC10h 40m
2026-06-26 KAL075 ICN → YVR Jun 26, 14:29 UTCJun 26, 23:25 UTC8h 55m
2026-06-26 KAL471 ICN → ICN Jun 26, 01:05 UTCJun 26, 11:49 UTC10h 45m
2026-06-24 KAL408 BNE → ICN Jun 24, 23:14 UTCJun 25, 08:34 UTC9h 20m
2026-06-24 KAL407 ICN → BNE Jun 24, 11:29 UTCJun 24, 20:30 UTC9h 0m
2026-06-24 KAL914 - Jun 24, 06:50 UTCJun 24, 07:10 UTC20m
2026-06-23 KAL914 - Jun 23, 19:15 UTCJun 24, 05:59 UTC10h 45m
2026-06-23 KAL913 - Jun 23, 01:25 UTCJun 23, 15:50 UTC14h 25m
2026-06-22 KAL498 - Jun 22, 20:04 UTCJun 22, 20:30 UTC25m
2026-06-22 KAL498 - Jun 22, 13:44 UTCJun 22, 15:50 UTC2h 5m
2026-06-22 KAL497 ICN → DEL Jun 22, 04:15 UTCJun 22, 11:14 UTC7h 0m
2026-06-21 KAL432 DPS → ICN Jun 21, 07:29 UTCJun 21, 22:29 UTC15h 0m
2026-06-21 KAL956 - Jun 21, 03:25 UTCJun 21, 03:44 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 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?
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 71C391, octal 34341621, decimal 7,455,633.
What flights does 71C391 operate?
Mode-S 71C391 has broadcast 20 distinct callsigns, including KAL922, KAL921, KAL498, KAL471, KAL032.