Apparatus

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sensors Mode-S transponder

71C275

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

Currently assigned to HL8275 · BOEING 777-300ER

Hex
71C275
Octal
34341165
Decimal
7,455,349
Country
KR
Tail
HL8275
Type
B77W
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
253
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 71C275.

Country allocation

The ICAO 24-bit address 71C275 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
KAL437 Korean Air 26 2026-07-26
KAL438 Korean Air 19 2026-07-26
KAL038 - 15 2026-07-21
KAL037 Korean Air 15 2026-07-21
KAL091 - 11 2026-06-28
KAL925 - 10 2026-07-13
KAL476 - 10 2026-06-23
KAL946 Korean Air 9 2026-07-24
KAL926 - 9 2026-07-14
KAL787 - 9 2026-07-16
KAL945 Korean Air 8 2026-07-24
KAL788 - 8 2026-07-17
KAL652 - 8 2026-07-07
KAL651 - 8 2026-07-07
KAL092 Korean Air 8 2026-06-28
KAL9983 Korean Air 5 2026-06-17
KAL9984 Korean Air 4 2026-06-18
KAL874 - 4 2026-07-26
KAL873 - 4 2026-07-26
KAL624 - 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL438 CGK → ICN Jul 26, 20:55 UTCJul 26, 21:15 UTC20m
2026-07-26 KAL437 ICN → CGK Jul 26, 17:00 UTCJul 26, 17:15 UTC15m
2026-07-26 KAL437 ICN → CGK Jul 26, 11:05 UTCJul 26, 15:45 UTC4h 40m
2026-07-26 KAL874 - Jul 26, 07:35 UTCJul 26, 08:05 UTC30m
2026-07-26 KAL873 - Jul 26, 04:40 UTCJul 26, 05:00 UTC20m
2026-07-25 KAL438 CGK → ICN Jul 25, 21:20 UTCJul 26, 02:20 UTC5h 0m
2026-07-25 KAL437 ICN → CGK Jul 25, 17:20 UTCJul 25, 17:35 UTC15m
2026-07-25 KAL437 ICN → CGK Jul 25, 11:15 UTCJul 25, 16:00 UTC4h 45m
2026-07-24 KAL946 FRA → ICN Jul 24, 18:40 UTCJul 25, 05:25 UTC10h 45m
2026-07-24 KAL945 ICN → FRA Jul 24, 03:55 UTCJul 24, 15:25 UTC11h 30m
2026-07-24 KAL945 ICN → FRA Jul 24, 02:45 UTCJul 24, 03:05 UTC20m
2026-07-23 KAL006 LAS → ICN Jul 23, 07:00 UTCJul 23, 18:35 UTC11h 35m
2026-07-22 KAL005 ICN → LAS Jul 22, 12:45 UTCJul 22, 23:50 UTC11h 5m
2026-07-21 KAL038 - Jul 21, 17:50 UTCJul 22, 00:15 UTC6h 25m
2026-07-21 KAL037 ICN → ORD Jul 21, 02:15 UTCJul 21, 14:15 UTC12h 0m
2026-07-20 KAL726 KIX → ICN Jul 20, 09:45 UTCJul 20, 11:10 UTC1h 25m
2026-07-20 KAL725 ICN → KIX Jul 20, 06:30 UTCJul 20, 07:55 UTC1h 25m
2026-07-19 KAL438 CGK → ICN Jul 19, 21:20 UTCJul 20, 02:15 UTC4h 55m
2026-07-19 KAL437 - Jul 19, 17:30 UTCJul 19, 17:50 UTC20m
2026-07-19 KAL437 - Jul 19, 11:20 UTCJul 19, 16:15 UTC4h 55m
2026-07-19 KAL874 - Jul 19, 07:15 UTCJul 19, 07:40 UTC25m
2026-07-19 KAL873 - Jul 19, 04:15 UTCJul 19, 04:35 UTC20m
2026-07-18 KAL438 CGK → ICN Jul 18, 21:25 UTCJul 19, 02:25 UTC5h 0m
2026-07-18 KAL437 - Jul 18, 17:30 UTCJul 18, 17:50 UTC20m
2026-07-18 KAL437 - Jul 18, 11:25 UTCJul 18, 16:10 UTC4h 45m
2026-07-18 KAL844 TAO → ICN Jul 18, 08:15 UTCJul 18, 08:50 UTC35m
2026-07-18 KAL843 - Jul 18, 04:45 UTCJul 18, 05:10 UTC25m
2026-07-17 KAL438 CGK → ICN Jul 17, 21:25 UTCJul 18, 02:25 UTC5h 0m
2026-07-17 KAL437 - Jul 17, 17:44 UTCJul 17, 18:05 UTC20m
2026-07-17 KAL437 - Jul 17, 11:45 UTCJul 17, 16:19 UTC4h 35m
2026-07-17 KAL874 - Jul 17, 08:10 UTCJul 17, 08:45 UTC35m
2026-07-17 KAL873 - Jul 17, 05:10 UTCJul 17, 05:30 UTC20m
2026-07-17 KAL788 - Jul 17, 01:59 UTCJul 17, 02:59 UTC1h 0m
2026-07-16 KAL787 - Jul 16, 23:20 UTCJul 17, 00:10 UTC50m
2026-07-15 KAL9978 - Jul 15, 22:30 UTCJul 16, 09:30 UTC11h 0m
2026-07-15 KAL9977 - Jul 15, 04:50 UTCJul 15, 17:00 UTC12h 10m
2026-07-15 KAL9977 - Jul 15, 03:35 UTCJul 15, 03:50 UTC15m
2026-07-14 KAL475 - Jul 14, 10:35 UTCJul 14, 22:10 UTC11h 35m
2026-07-14 KAL926 - Jul 14, 06:40 UTCJul 14, 07:05 UTC25m
2026-07-13 KAL926 - Jul 13, 19:55 UTCJul 14, 05:55 UTC10h 0m
2026-07-13 KAL925 - Jul 13, 04:20 UTCJul 13, 16:15 UTC11h 55m
2026-07-13 KAL925 - Jul 13, 03:10 UTCJul 13, 03:30 UTC20m
2026-07-11 KAL438 - Jul 11, 23:25 UTCJul 12, 04:25 UTC5h 0m
2026-07-11 KAL437 - Jul 11, 19:40 UTCJul 11, 19:55 UTC15m
2026-07-11 KAL437 - Jul 11, 13:20 UTCJul 11, 18:10 UTC4h 50m
2026-07-11 KAL2042 - Jul 11, 07:50 UTCJul 11, 08:10 UTC20m
2026-07-11 KAL2041 - Jul 11, 00:15 UTCJul 11, 06:55 UTC6h 40m
2026-07-09 KAL038 - Jul 9, 17:55 UTCJul 10, 07:20 UTC13h 25m
2026-07-09 KAL037 ICN → ORD Jul 9, 02:15 UTCJul 9, 14:35 UTC12h 20m
2026-07-08 KAL874 - Jul 8, 07:15 UTCJul 8, 07:35 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 HL8275 page for operator, model, and routing details .

Mode-S 71C275 frequently asked

What is Mode-S code 71C275?
71C275 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8275.
Where is Mode-S 71C275 registered?
Mode-S code 71C275 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 71C275 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C275, octal 34341165, decimal 7,455,349.
What flights does 71C275 operate?
Mode-S 71C275 has broadcast 20 distinct callsigns, including KAL437, KAL438, KAL038, KAL037, KAL091.