Apparatus

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sensors Mode-S transponder

71C536

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

Currently assigned to HL8537 · BOEING 787-10 Dreamliner

Hex
71C536
Octal
34342466
Decimal
7,456,054
Country
KR
Tail
HL8537
Type
B78X
No current signal · last broadcast 3h ago
Flights observed
178
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 71C536.

Country allocation

The ICAO 24-bit address 71C536 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
KAL401 - 10 2026-07-11
KAL053 Korean Air 10 2026-06-02
KAL928 - 9 2026-06-15
KAL402 - 9 2026-07-11
KAL927 - 8 2026-06-14
KAL041 - 8 2026-07-07
KAL963 - 7 2026-07-14
KAL448 - 7 2026-06-20
KAL042 - 7 2026-07-07
KAL964 Korean Air 6 2026-05-29
KAL704 - 6 2026-06-21
KAL434 - 6 2026-07-08
KAL054 Korean Air 6 2026-06-02
KAL024 - 6 2026-07-10
KAL023 - 6 2026-07-10
KAL724 Korean Air 5 2026-05-25
KAL723 Korean Air 5 2026-05-25
KAL703 - 5 2026-06-21
KAL447 - 5 2026-06-20
KAL2021 Korean Air 5 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL963 - Jul 14, 04:55 UTCJul 14, 05:15 UTC20m
2026-07-14 KAL938 - Jul 14, 02:30 UTCJul 14, 02:55 UTC25m
2026-07-13 KAL938 - Jul 13, 16:50 UTCJul 14, 01:40 UTC8h 50m
2026-07-13 KAL937 - Jul 13, 03:10 UTCJul 13, 13:55 UTC10h 45m
2026-07-13 KAL937 - Jul 13, 01:55 UTCJul 13, 02:10 UTC15m
2026-07-11 KAL402 SYD → ICN Jul 11, 23:00 UTCJul 12, 08:50 UTC9h 50m
2026-07-11 KAL401 ICN → SYD Jul 11, 11:00 UTCJul 11, 20:50 UTC9h 50m
2026-07-10 KAL024 SFO → ICN Jul 10, 20:35 UTCJul 11, 07:50 UTC11h 15m
2026-07-10 KAL023 ICN → SFO Jul 10, 07:35 UTCJul 10, 17:55 UTC10h 20m
2026-07-10 KAL918 - Jul 10, 04:10 UTCJul 10, 04:35 UTC25m
2026-07-09 KAL918 - Jul 9, 18:10 UTCJul 9, 21:35 UTC3h 25m
2026-07-09 KAL917 - Jul 9, 04:05 UTCJul 9, 15:25 UTC11h 20m
2026-07-09 KAL917 - Jul 9, 02:45 UTCJul 9, 03:05 UTC20m
2026-07-08 KAL434 ICN → ICN Jul 8, 09:40 UTCJul 8, 23:55 UTC14h 15m
2026-07-07 KAL042 SEA → ICN Jul 7, 20:40 UTCJul 8, 07:15 UTC10h 35m
2026-07-07 KAL041 ICN → SEA Jul 7, 08:05 UTCJul 7, 17:35 UTC9h 30m
2026-07-07 KAL882 - Jul 7, 00:00 UTCJul 7, 05:15 UTC5h 15m
2026-07-06 KAL196P PUS → ICN Jul 6, 07:30 UTCJul 6, 08:20 UTC50m
2026-06-23 KAL195F ICN → PUS Jun 23, 22:25 UTCJun 23, 23:05 UTC40m
2026-06-22 KAL881 - Jun 22, 23:45 UTCJun 23, 05:09 UTC5h 25m
2026-06-21 KAL412 - Jun 21, 23:34 UTCJun 22, 10:55 UTC11h 20m
2026-06-21 KAL411 - Jun 21, 09:35 UTCJun 21, 20:09 UTC10h 35m
2026-06-21 KAL704 - Jun 21, 05:30 UTCJun 21, 07:29 UTC2h 0m
2026-06-21 KAL703 - Jun 21, 01:35 UTCJun 21, 03:40 UTC2h 5m
2026-06-20 KAL448 - Jun 20, 16:39 UTCJun 20, 20:14 UTC3h 35m
2026-06-20 KAL447 - Jun 20, 13:19 UTCJun 20, 14:35 UTC1h 15m
2026-06-20 KAL447 - Jun 20, 10:09 UTCJun 20, 10:34 UTC25m
2026-06-19 KAL024 SFO → ICN Jun 19, 20:14 UTCJun 20, 07:14 UTC11h 0m
2026-06-19 KAL023 ICN → SFO Jun 19, 07:19 UTCJun 19, 17:34 UTC10h 15m
2026-06-18 KAL882 ICN → ICN Jun 18, 23:45 UTCJun 19, 05:19 UTC5h 34m
2026-06-17 KAL024 - Jun 17, 21:00 UTCJun 18, 08:15 UTC11h 15m
2026-06-17 KAL023 ICN → SFO Jun 17, 07:30 UTCJun 17, 18:40 UTC11h 10m
2026-06-16 KAL434 ICN → ICN Jun 16, 09:25 UTCJun 17, 00:05 UTC14h 41m
2026-06-16 KAL704 - Jun 16, 05:15 UTCJun 16, 07:05 UTC1h 50m
2026-06-16 KAL703 ICN → NRT Jun 16, 01:45 UTCJun 16, 03:35 UTC1h 50m
2026-06-15 KAL928 - Jun 15, 07:25 UTCJun 15, 07:45 UTC20m
2026-06-14 KAL928 - Jun 14, 21:00 UTCJun 15, 00:35 UTC3h 34m
2026-06-14 KAL927 - Jun 14, 13:35 UTCJun 14, 17:50 UTC4h 15m
2026-06-14 KAL927 - Jun 14, 05:10 UTCJun 14, 05:25 UTC15m
2026-06-13 KAL438 CGK → ICN Jun 13, 21:30 UTCJun 14, 02:15 UTC4h 45m
2026-06-13 KAL437 ICN → CGK Jun 13, 17:00 UTCJun 13, 17:15 UTC15m
2026-06-13 KAL437 ICN → CGK Jun 13, 10:55 UTCJun 13, 15:35 UTC4h 40m
2026-06-12 KAL402 SYD → ICN Jun 12, 23:00 UTCJun 13, 08:35 UTC9h 34m
2026-06-12 KAL401 ICN → SYD Jun 12, 11:00 UTCJun 12, 20:50 UTC9h 50m
2026-06-11 KAL677 ICN → HKT Jun 11, 09:30 UTCJun 11, 22:20 UTC12h 50m
2026-06-11 KAL938 VIE → ICN Jun 11, 02:40 UTCJun 11, 03:05 UTC25m
2026-06-10 KAL938 VIE → ICN Jun 10, 16:40 UTCJun 11, 01:50 UTC9h 10m
2026-06-10 KAL937 ICN → VIE Jun 10, 03:20 UTCJun 10, 14:00 UTC10h 40m
2026-06-08 KAL402 SYD → ICN Jun 8, 22:25 UTCJun 9, 08:20 UTC9h 55m
2026-06-08 KAL401 ICN → SYD Jun 8, 10:55 UTCJun 8, 20:25 UTC9h 30m

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 HL8537 page for operator, model, and routing details .

Mode-S 71C536 frequently asked

What is Mode-S code 71C536?
71C536 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8537.
Where is Mode-S 71C536 registered?
Mode-S code 71C536 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 71C536 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C536, octal 34342466, decimal 7,456,054.
What flights does 71C536 operate?
Mode-S 71C536 has broadcast 20 distinct callsigns, including KAL401, KAL053, KAL928, KAL402, KAL927.