Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C515

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

Currently assigned to HL8515 · BOEING 787-10 Dreamliner

Hex
71C515
Octal
34342425
Decimal
7,456,021
Country
KR
Tail
HL8515
Type
B78X
Broadcasting now · callsign KAL024 · 40,000 ft
Flights observed
216
Distinct callsigns
20
Country
KR
Last broadcast
9h ago

Current position

71C515 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C515 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
KAL041 - 15 2026-07-09
KAL042 - 14 2026-07-09
KAL053 - 13 2026-07-12
KAL724 - 11 2026-07-17
KAL723 Korean Air 11 2026-07-17
KAL023 - 11 2026-07-17
KAL054 - 10 2026-07-12
KAL024 Korean Air 10 2026-07-17
KAL928 - 8 2026-06-16
KAL447 - 8 2026-07-10
KAL402 - 8 2026-07-15
KAL401 - 8 2026-07-15
KAL970 - 7 2026-06-20
KAL927 - 7 2026-06-15
KAL448 - 7 2026-07-10
KAL434 - 7 2026-07-11
KAL969 - 6 2026-06-19
KAL938 - 6 2026-07-09
KAL937 - 5 2026-07-08
KAL882 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 KAL024 SFO → ICN Jul 17, 20:40 UTCJul 17, 21:10 UTC30m
2026-07-17 KAL023 ICN → SFO Jul 17, 07:40 UTCJul 17, 18:05 UTC10h 25m
2026-07-17 KAL724 - Jul 17, 04:14 UTCJul 17, 05:30 UTC1h 15m
2026-07-17 KAL723 ICN → KIX Jul 17, 01:05 UTCJul 17, 02:25 UTC1h 20m
2026-07-15 KAL402 SYD → ICN Jul 15, 22:20 UTCJul 16, 08:00 UTC9h 40m
2026-07-15 KAL401 ICN → SYD Jul 15, 10:45 UTCJul 15, 20:20 UTC9h 35m
2026-07-14 KAL024 SFO → ICN Jul 14, 21:10 UTCJul 15, 08:20 UTC11h 9m
2026-07-14 KAL023 ICN → SFO Jul 14, 07:50 UTCJul 14, 18:45 UTC10h 55m
2026-07-13 KAL882 - Jul 13, 23:55 UTCJul 14, 05:20 UTC5h 25m
2026-07-12 KAL054 - Jul 12, 23:25 UTCJul 13, 08:40 UTC9h 15m
2026-07-12 KAL053 - Jul 12, 12:40 UTCJul 12, 20:50 UTC8h 10m
2026-07-12 KAL887 - Jul 12, 05:25 UTCJul 12, 10:35 UTC5h 10m
2026-07-11 KAL434 ICN → ICN Jul 11, 09:40 UTCJul 12, 00:01 UTC14h 20m
2026-07-11 KAL724 KIX → ICN Jul 11, 03:55 UTCJul 11, 05:10 UTC1h 15m
2026-07-11 KAL723 ICN → KIX Jul 11, 00:50 UTCJul 11, 02:15 UTC1h 25m
2026-07-10 KAL448 - Jul 10, 20:00 UTCJul 10, 20:45 UTC45m
2026-07-10 KAL447 - Jul 10, 10:20 UTCJul 10, 11:00 UTC40m
2026-07-09 KAL042 SEA → ICN Jul 9, 20:40 UTCJul 10, 07:30 UTC10h 50m
2026-07-09 KAL041 ICN → SEA Jul 9, 08:10 UTCJul 9, 17:40 UTC9h 30m
2026-07-09 KAL938 - Jul 9, 02:15 UTCJul 9, 02:35 UTC20m
2026-07-08 KAL938 - Jul 8, 16:45 UTCJul 9, 01:30 UTC8h 45m
2026-07-08 KAL937 - Jul 8, 03:45 UTCJul 8, 14:35 UTC10h 50m
2026-07-08 KAL937 - Jul 8, 02:30 UTCJul 8, 02:45 UTC15m
2026-07-06 KAL042 SEA → ICN Jul 6, 20:40 UTCJul 7, 07:10 UTC10h 30m
2026-07-06 KAL041 ICN → SEA Jul 6, 08:05 UTCJul 6, 17:25 UTC9h 20m
2026-07-06 KAL724 KIX → ICN Jul 6, 04:20 UTCJul 6, 05:45 UTC1h 25m
2026-07-06 KAL723 - Jul 6, 01:20 UTCJul 6, 02:45 UTC1h 25m
2026-07-05 KAL468 CXR → ICN Jul 5, 11:15 UTCJul 5, 22:05 UTC10h 50m
2026-07-04 KAL054 - Jul 4, 23:25 UTCJul 5, 08:45 UTC9h 20m
2026-07-04 KAL053 - Jul 4, 20:10 UTCJul 4, 20:35 UTC25m
2026-07-04 KAL053 - Jul 4, 12:35 UTCJul 4, 14:25 UTC1h 50m
2026-07-03 KAL402 SYD → ICN Jul 3, 22:35 UTCJul 4, 08:25 UTC9h 50m
2026-07-03 KAL401 ICN → SYD Jul 3, 10:50 UTCJul 3, 20:25 UTC9h 35m
2026-07-02 KAL402 SYD → ICN Jul 2, 22:40 UTCJul 3, 08:30 UTC9h 50m
2026-07-02 KAL401 ICN → SYD Jul 2, 11:00 UTCJul 2, 20:30 UTC9h 30m
2026-07-01 KAL024 SFO → ICN Jul 1, 20:45 UTCJul 2, 08:45 UTC12h 0m
2026-07-01 KAL023 - Jul 1, 07:20 UTCJul 1, 17:25 UTC10h 5m
2026-06-29 KAL054 - Jun 29, 23:25 UTCJun 30, 08:35 UTC9h 11m
2026-06-29 KAL053 - Jun 29, 20:19 UTCJun 29, 20:30 UTC10m
2026-06-29 KAL053 - Jun 29, 12:29 UTCJun 29, 14:19 UTC1h 50m
2026-06-29 KAL054 - Jun 29, 06:05 UTCJun 29, 08:29 UTC2h 25m
2026-06-28 KAL054 - Jun 28, 23:25 UTCJun 28, 23:34 UTC10m
2026-06-28 KAL053 - Jun 28, 20:34 UTCJun 28, 20:45 UTC10m
2026-06-28 KAL053 - Jun 28, 12:55 UTCJun 28, 14:34 UTC1h 40m
2026-06-27 KAL677 ICN → ICN Jun 27, 09:15 UTCJun 27, 22:15 UTC13h 0m
2026-06-27 KAL724 - Jun 27, 04:05 UTCJun 27, 05:19 UTC1h 15m
2026-06-27 KAL723 ICN → KIX Jun 27, 01:00 UTCJun 27, 02:20 UTC1h 20m
2026-06-26 KAL448 - Jun 26, 16:30 UTCJun 26, 20:00 UTC3h 30m
2026-06-26 KAL447 - Jun 26, 10:25 UTCJun 26, 14:05 UTC3h 40m
2026-06-25 KAL042 SEA → ICN Jun 25, 20:39 UTCJun 26, 07:24 UTC10h 45m

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 HL8515 page for operator, model, and routing details .

Mode-S 71C515 frequently asked

What is Mode-S code 71C515?
71C515 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8515.
Where is Mode-S 71C515 registered?
Mode-S code 71C515 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 71C515 broadcasting right now?
Yes. Mode-S 71C515 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C515, octal 34342425, decimal 7,456,021.
What flights does 71C515 operate?
Mode-S 71C515 has broadcast 20 distinct callsigns, including KAL041, KAL042, KAL053, KAL724, KAL723.