Apparatus

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sensors Mode-S transponder

71C535

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

Currently assigned to HL8535 · BOEING 787-10 Dreamliner

Hex
71C535
Octal
34342465
Decimal
7,456,053
Country
KR
Tail
HL8535
Type
B78X
No current signal · last broadcast Jul 26, 14:15 UTC
Flights observed
254
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 14:15 UTC

Last known position

Most recent position reported by Mode-S 71C535.

Country allocation

The ICAO 24-bit address 71C535 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
KAL970 Korean Air 14 2026-07-24
KAL928 - 14 2026-07-11
KAL927 - 14 2026-07-10
KAL053 Korean Air 14 2026-07-26
KAL402 - 11 2026-07-14
KAL401 - 11 2026-07-14
KAL054 Korean Air 11 2026-07-25
KAL969 Korean Air 10 2026-07-24
KAL447 - 10 2026-07-15
KAL448 - 9 2026-07-15
KAL434 Korean Air 9 2026-07-23
KAL024 Korean Air 9 2026-07-21
KAL023 Korean Air 9 2026-07-21
KAL437 - 7 2026-06-27
KAL938 Korean Air 6 2026-07-21
KAL914 - 6 2026-06-27
KAL913 - 6 2026-06-26
KAL882 Korean Air 5 2026-07-22
KAL724 - 5 2026-07-16
KAL2022 - 5 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL053 ICN → HNL Jul 26, 12:25 UTCJul 26, 14:15 UTC1h 50m
2026-07-25 KAL054 HNL → ICN Jul 25, 23:30 UTCJul 26, 08:30 UTC9h 1m
2026-07-25 KAL053 ICN → HNL Jul 25, 12:35 UTCJul 25, 14:25 UTC1h 50m
2026-07-24 KAL970 PRG → ICN Jul 24, 17:20 UTCJul 25, 03:55 UTC10h 35m
2026-07-24 KAL969 ICN → PRG Jul 24, 04:15 UTCJul 24, 15:10 UTC10h 55m
2026-07-24 KAL969 ICN → PRG Jul 24, 03:05 UTCJul 24, 03:20 UTC15m
2026-07-23 KAL434 DPS → ICN Jul 23, 09:35 UTCJul 24, 00:00 UTC14h 25m
2026-07-22 KAL882 PVG → ICN Jul 22, 23:55 UTCJul 23, 05:55 UTC6h 0m
2026-07-21 KAL024 SFO → ICN Jul 21, 21:10 UTCJul 21, 21:40 UTC30m
2026-07-21 KAL023 ICN → SFO Jul 21, 07:50 UTCJul 21, 18:20 UTC10h 30m
2026-07-21 KAL938 VIE → ICN Jul 21, 02:05 UTCJul 21, 02:30 UTC25m
2026-07-20 KAL938 VIE → ICN Jul 20, 16:40 UTCJul 21, 01:15 UTC8h 35m
2026-07-20 KAL937 ICN → VIE Jul 20, 03:10 UTCJul 20, 13:55 UTC10h 45m
2026-07-20 KAL937 ICN → VIE Jul 20, 02:10 UTCJul 20, 02:25 UTC15m
2026-07-19 KAL2022 TPE → ICN Jul 19, 05:40 UTCJul 19, 07:45 UTC2h 5m
2026-07-19 KAL2021 ICN → TPE Jul 19, 01:45 UTCJul 19, 03:45 UTC2h 0m
2026-07-18 KAL8054 - Jul 18, 08:05 UTCJul 18, 10:20 UTC2h 15m
2026-07-18 KAL8054 - Jul 18, 01:10 UTCJul 18, 01:20 UTC10m
2026-07-17 KAL8053 - Jul 17, 22:00 UTCJul 17, 22:20 UTC20m
2026-07-17 KAL8053 - Jul 17, 14:10 UTCJul 17, 16:00 UTC1h 50m
2026-07-16 KAL054 - Jul 16, 23:20 UTCJul 17, 08:30 UTC9h 10m
2026-07-16 KAL053 - Jul 16, 20:19 UTCJul 16, 20:35 UTC15m
2026-07-16 KAL053 - Jul 16, 12:25 UTCJul 16, 14:15 UTC1h 50m
2026-07-16 KAL724 KIX → ICN Jul 16, 04:10 UTCJul 16, 05:30 UTC1h 20m
2026-07-16 KAL723 ICN → KIX Jul 16, 01:20 UTCJul 16, 02:40 UTC1h 20m
2026-07-15 KAL448 - Jul 15, 19:40 UTCJul 15, 20:20 UTC40m
2026-07-15 KAL448 - Jul 15, 16:30 UTCJul 15, 16:40 UTC10m
2026-07-15 KAL447 - Jul 15, 13:45 UTCJul 15, 13:55 UTC10m
2026-07-15 KAL447 - Jul 15, 10:30 UTCJul 15, 11:10 UTC40m
2026-07-14 KAL402 SYD → ICN Jul 14, 22:30 UTCJul 15, 08:15 UTC9h 44m
2026-07-14 KAL401 ICN → SYD Jul 14, 10:45 UTCJul 14, 20:30 UTC9h 45m
2026-07-13 KAL024 SFO → ICN Jul 13, 20:50 UTCJul 14, 08:05 UTC11h 15m
2026-07-13 KAL023 ICN → SFO Jul 13, 07:45 UTCJul 13, 18:20 UTC10h 35m
2026-07-12 KAL882 - Jul 12, 23:50 UTCJul 13, 05:35 UTC5h 45m
2026-07-12 KAL448 - Jul 12, 19:40 UTCJul 12, 20:20 UTC40m
2026-07-12 KAL448 - Jul 12, 16:35 UTCJul 12, 16:45 UTC10m
2026-07-12 KAL447 - Jul 12, 10:20 UTCJul 12, 10:35 UTC15m
2026-07-11 KAL448 - Jul 11, 20:20 UTCJul 11, 20:40 UTC20m
2026-07-11 KAL448 - Jul 11, 17:05 UTCJul 11, 17:15 UTC10m
2026-07-11 KAL447 - Jul 11, 14:30 UTCJul 11, 14:40 UTC10m
2026-07-11 KAL447 - Jul 11, 11:10 UTCJul 11, 11:20 UTC10m
2026-07-11 KAL928 - Jul 11, 06:35 UTCJul 11, 06:55 UTC20m
2026-07-10 KAL928 - Jul 10, 20:25 UTCJul 11, 05:50 UTC9h 25m
2026-07-10 KAL927 - Jul 10, 06:20 UTCJul 10, 18:10 UTC11h 50m
2026-07-10 KAL927 - Jul 10, 05:10 UTCJul 10, 05:30 UTC20m
2026-07-09 KAL434 - Jul 9, 09:45 UTCJul 10, 00:00 UTC14h 15m
2026-07-09 KAL928 - Jul 9, 06:45 UTCJul 9, 07:05 UTC20m
2026-07-08 KAL928 - Jul 8, 20:45 UTCJul 9, 05:55 UTC9h 10m
2026-07-08 KAL927 - Jul 8, 06:30 UTCJul 8, 18:10 UTC11h 40m
2026-07-08 KAL927 - Jul 8, 05:15 UTCJul 8, 05:35 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 HL8535 page for operator, model, and routing details .

Mode-S 71C535 frequently asked

What is Mode-S code 71C535?
71C535 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8535.
Where is Mode-S 71C535 registered?
Mode-S code 71C535 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 71C535 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C535, octal 34342465, decimal 7,456,053.
What flights does 71C535 operate?
Mode-S 71C535 has broadcast 20 distinct callsigns, including KAL970, KAL928, KAL927, KAL053, KAL402.