Apparatus

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sensors Mode-S transponder

71C538

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

Currently assigned to HL8538 · BOEING 787-10 Dreamliner

Hex
71C538
Octal
34342470
Decimal
7,456,056
Country
KR
Tail
HL8538
Type
B78X
No current signal · last broadcast Jul 26, 09:05 UTC
Flights observed
242
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 09:05 UTC

Last known position

Most recent position reported by Mode-S 71C538.

Country allocation

The ICAO 24-bit address 71C538 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
KAL969 - 22 2026-07-08
KAL970 - 19 2026-07-09
KAL402 Korean Air 15 2026-07-25
KAL401 Korean Air 14 2026-07-25
KAL024 Korean Air 14 2026-07-22
KAL023 Korean Air 13 2026-07-22
KAL928 - 12 2026-07-04
KAL927 - 11 2026-07-03
KAL434 - 9 2026-06-18
KAL448 Korean Air 8 2026-07-20
KAL042 Korean Air 8 2026-07-19
KAL041 Korean Air 8 2026-07-19
KAL723 Korean Air 7 2026-07-19
KAL447 Korean Air 7 2026-07-20
KAL938 - 6 2026-07-16
KAL937 - 6 2026-07-15
KAL724 Korean Air 6 2026-07-19
KAL053 Korean Air 5 2026-05-25
KAL918 - 4 2026-07-22
KAL917 Korean Air 4 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 KAL402 SYD → ICN Jul 25, 23:10 UTCJul 26, 09:05 UTC9h 56m
2026-07-25 KAL401 ICN → SYD Jul 25, 10:55 UTCJul 25, 21:00 UTC10h 5m
2026-07-24 KAL402 SYD → ICN Jul 24, 22:45 UTCJul 25, 08:30 UTC9h 45m
2026-07-24 KAL401 ICN → SYD Jul 24, 10:55 UTCJul 24, 20:35 UTC9h 40m
2026-07-24 KAL887 ICN → PVG Jul 24, 02:35 UTCJul 24, 07:35 UTC5h 0m
2026-07-22 KAL024 SFO → ICN Jul 22, 21:35 UTCJul 23, 08:40 UTC11h 5m
2026-07-22 KAL023 ICN → SFO Jul 22, 17:45 UTCJul 22, 18:45 UTC1h 0m
2026-07-22 KAL918 - Jul 22, 04:10 UTCJul 22, 04:35 UTC25m
2026-07-21 KAL918 - Jul 21, 18:05 UTCJul 22, 03:30 UTC9h 25m
2026-07-21 KAL917 ICN → ZRH Jul 21, 03:55 UTCJul 21, 15:30 UTC11h 35m
2026-07-21 KAL917 ICN → ZRH Jul 21, 02:35 UTCJul 21, 03:00 UTC25m
2026-07-20 KAL448 HAN → ICN Jul 20, 19:25 UTCJul 20, 20:05 UTC40m
2026-07-20 KAL448 HAN → ICN Jul 20, 16:25 UTCJul 20, 16:40 UTC15m
2026-07-20 KAL447 ICN → HAN Jul 20, 10:45 UTCJul 20, 11:25 UTC40m
2026-07-19 KAL042 SEA → ICN Jul 19, 20:50 UTCJul 20, 07:30 UTC10h 40m
2026-07-19 KAL041 ICN → SEA Jul 19, 07:55 UTCJul 19, 17:45 UTC9h 50m
2026-07-19 KAL724 KIX → ICN Jul 19, 04:15 UTCJul 19, 05:35 UTC1h 20m
2026-07-19 KAL723 ICN → KIX Jul 19, 01:15 UTCJul 19, 02:35 UTC1h 20m
2026-07-19 KAL723 ICN → KIX Jul 19, 01:00 UTCJul 19, 01:05 UTC5m
2026-07-17 KAL402 SYD → ICN Jul 17, 22:45 UTCJul 18, 08:25 UTC9h 41m
2026-07-17 KAL401 ICN → SYD Jul 17, 10:40 UTCJul 17, 20:29 UTC9h 50m
2026-07-16 KAL024 SFO → ICN Jul 16, 20:49 UTCJul 17, 08:00 UTC11h 10m
2026-07-16 KAL023 ICN → SFO Jul 16, 07:35 UTCJul 16, 18:15 UTC10h 40m
2026-07-16 KAL938 - Jul 16, 02:05 UTCJul 16, 02:30 UTC25m
2026-07-15 KAL938 - Jul 15, 16:45 UTCJul 16, 01:25 UTC8h 40m
2026-07-15 KAL937 - Jul 15, 03:35 UTCJul 15, 14:25 UTC10h 50m
2026-07-15 KAL937 - Jul 15, 02:20 UTCJul 15, 02:40 UTC20m
2026-07-14 KAL468 - Jul 14, 11:15 UTCJul 14, 21:50 UTC10h 35m
2026-07-14 KAL704 - Jul 14, 05:05 UTCJul 14, 07:00 UTC1h 55m
2026-07-14 KAL703 ICN → NRT Jul 14, 01:40 UTCJul 14, 03:30 UTC1h 50m
2026-07-13 KAL448 - Jul 13, 19:40 UTCJul 13, 20:20 UTC40m
2026-07-13 KAL448 - Jul 13, 16:30 UTCJul 13, 16:45 UTC15m
2026-07-13 KAL447 - Jul 13, 10:25 UTCJul 13, 11:00 UTC35m
2026-07-12 KAL024 SFO → ICN Jul 12, 20:40 UTCJul 13, 08:01 UTC11h 20m
2026-07-12 KAL023 ICN → SFO Jul 12, 07:25 UTCJul 12, 17:55 UTC10h 30m
2026-07-12 KAL706 - Jul 12, 02:01 UTCJul 12, 02:30 UTC30m
2026-07-12 KAL706 - Jul 12, 00:35 UTCJul 12, 01:30 UTC55m
2026-07-11 KAL705 ICN → NRT Jul 11, 10:40 UTCJul 11, 12:30 UTC1h 50m
2026-07-10 KAL402 SYD → ICN Jul 10, 22:30 UTCJul 11, 08:15 UTC9h 45m
2026-07-10 KAL401 ICN → SYD Jul 10, 10:50 UTCJul 10, 20:15 UTC9h 25m
2026-07-09 KAL024 - Jul 9, 20:50 UTCJul 10, 08:25 UTC11h 35m
2026-07-09 KAL023 ICN → SFO Jul 9, 07:50 UTCJul 9, 18:20 UTC10h 30m
2026-07-09 KAL970 - Jul 9, 03:20 UTCJul 9, 03:40 UTC20m
2026-07-08 KAL970 - Jul 8, 17:40 UTCJul 9, 02:35 UTC8h 55m
2026-07-08 KAL969 - Jul 8, 04:25 UTCJul 8, 15:30 UTC11h 5m
2026-07-08 KAL969 - Jul 8, 03:05 UTCJul 8, 03:25 UTC20m
2026-07-07 KAL970 - Jul 7, 03:40 UTCJul 7, 04:05 UTC25m
2026-07-06 KAL970 - Jul 6, 17:40 UTCJul 7, 02:55 UTC9h 15m
2026-07-06 KAL969 - Jul 6, 04:20 UTCJul 6, 15:15 UTC10h 55m
2026-07-06 KAL969 - Jul 6, 03:10 UTCJul 6, 03:25 UTC15m

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 HL8538 page for operator, model, and routing details .

Mode-S 71C538 frequently asked

What is Mode-S code 71C538?
71C538 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8538.
Where is Mode-S 71C538 registered?
Mode-S code 71C538 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 71C538 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 09:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C538, octal 34342470, decimal 7,456,056.
What flights does 71C538 operate?
Mode-S 71C538 has broadcast 20 distinct callsigns, including KAL969, KAL970, KAL402, KAL401, KAL024.