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
Broadcasting now · callsign KAL042 · 36,000 ft
Flights observed
209
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 20:20 UTC

Current position

71C536 is currently broadcasting. Map zoomed to live position.

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
KAL053 Korean Air 13 2026-07-18
KAL401 - 11 2026-07-16
KAL448 Korean Air 10 2026-07-26
KAL402 Korean Air 10 2026-07-16
KAL928 - 9 2026-06-15
KAL054 - 9 2026-07-18
KAL041 Korean Air 9 2026-07-22
KAL964 - 8 2026-07-15
KAL963 - 8 2026-07-14
KAL927 - 8 2026-06-14
KAL447 Korean Air 8 2026-07-26
KAL042 Korean Air 8 2026-07-22
KAL024 Korean Air 8 2026-07-25
KAL023 Korean Air 8 2026-07-25
KAL434 Korean Air 7 2026-07-20
KAL938 Korean Air 6 2026-07-25
KAL724 Korean Air 6 2026-07-20
KAL723 Korean Air 6 2026-07-20
KAL704 - 6 2026-06-21
KAL937 Korean Air 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL448 HAN → ICN Jul 26, 16:40 UTCJul 26, 20:20 UTC3h 40m
2026-07-26 KAL447 ICN → HAN Jul 26, 10:45 UTCJul 26, 11:10 UTC25m
2026-07-25 KAL024 SFO → ICN Jul 25, 20:50 UTCJul 26, 08:20 UTC11h 31m
2026-07-25 KAL023 ICN → SFO Jul 25, 07:25 UTCJul 25, 18:00 UTC10h 35m
2026-07-25 KAL938 VIE → ICN Jul 25, 02:20 UTCJul 25, 02:40 UTC20m
2026-07-24 KAL938 VIE → ICN Jul 24, 16:50 UTCJul 25, 01:35 UTC8h 45m
2026-07-24 KAL937 ICN → VIE Jul 24, 03:50 UTCJul 24, 14:20 UTC10h 30m
2026-07-24 KAL937 ICN → VIE Jul 24, 02:25 UTCJul 24, 02:50 UTC25m
2026-07-23 KAL448 HAN → ICN Jul 23, 16:35 UTCJul 23, 20:20 UTC3h 45m
2026-07-23 KAL447 ICN → HAN Jul 23, 10:20 UTCJul 23, 11:00 UTC40m
2026-07-22 KAL042 SEA → ICN Jul 22, 20:45 UTCJul 23, 07:25 UTC10h 40m
2026-07-22 KAL041 ICN → SEA Jul 22, 10:20 UTCJul 22, 18:20 UTC8h 0m
2026-07-21 KAL882 PVG → ICN Jul 21, 23:45 UTCJul 22, 05:05 UTC5h 20m
2026-07-20 KAL434 DPS → ICN Jul 20, 09:15 UTCJul 21, 00:00 UTC14h 44m
2026-07-20 KAL724 KIX → ICN Jul 20, 04:30 UTCJul 20, 05:50 UTC1h 20m
2026-07-20 KAL723 ICN → KIX Jul 20, 01:10 UTCJul 20, 02:40 UTC1h 30m
2026-07-19 KAL448 HAN → ICN Jul 19, 20:25 UTCJul 19, 21:00 UTC35m
2026-07-19 KAL447 - Jul 19, 11:25 UTCJul 19, 14:05 UTC2h 40m
2026-07-18 KAL054 HNL → ICN Jul 18, 23:45 UTCJul 19, 08:45 UTC9h 0m
2026-07-18 KAL053 ICN → HNL Jul 18, 12:15 UTCJul 18, 14:05 UTC1h 50m
2026-07-18 KAL054 - Jul 18, 06:15 UTCJul 18, 08:25 UTC2h 10m
2026-07-17 KAL054 - Jul 17, 23:20 UTCJul 17, 23:35 UTC15m
2026-07-17 KAL053 ICN → HNL Jul 17, 20:29 UTCJul 17, 20:55 UTC25m
2026-07-17 KAL053 - Jul 17, 12:50 UTCJul 17, 14:35 UTC1h 45m
2026-07-16 KAL402 SYD → ICN Jul 16, 22:35 UTCJul 17, 08:20 UTC9h 45m
2026-07-16 KAL401 ICN → SYD Jul 16, 10:40 UTCJul 16, 20:15 UTC9h 35m
2026-07-15 KAL024 SFO → ICN Jul 15, 20:25 UTCJul 16, 07:35 UTC11h 10m
2026-07-15 KAL023 ICN → SFO Jul 15, 07:25 UTCJul 15, 17:55 UTC10h 30m
2026-07-15 KAL964 - Jul 15, 04:20 UTCJul 15, 04:45 UTC25m
2026-07-14 KAL964 - Jul 14, 19:00 UTCJul 15, 03:40 UTC8h 39m
2026-07-14 KAL963 - Jul 14, 06:10 UTCJul 14, 16:45 UTC10h 35m
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

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?
Yes. Mode-S 71C536 is currently airborne.
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 KAL053, KAL401, KAL448, KAL402, KAL928.