Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 3h ago
Flights observed
216
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

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 - 16 2026-07-11
KAL438 - 14 2026-07-11
KAL038 - 14 2026-07-09
KAL037 - 14 2026-07-09
KAL091 - 11 2026-06-28
KAL925 - 10 2026-07-13
KAL476 - 10 2026-06-23
KAL926 - 9 2026-07-14
KAL946 - 8 2026-06-13
KAL787 Korean Air 8 2026-06-02
KAL652 - 8 2026-07-07
KAL651 - 8 2026-07-07
KAL092 Korean Air 8 2026-06-28
KAL788 Korean Air 7 2026-06-03
KAL945 Korean Air 6 2026-06-12
KAL9983 Korean Air 5 2026-06-17
KAL9984 Korean Air 4 2026-06-18
KAL624 - 4 2026-06-27
KAL623 - 4 2026-06-27
KAL9982 Korean Air 3 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL475 - Jul 14, 10:35 UTCJul 14, 13:10 UTC2h 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
2026-07-08 KAL873 - Jul 8, 04:15 UTCJul 8, 04:40 UTC25m
2026-07-07 KAL652 - Jul 7, 17:00 UTCJul 7, 21:55 UTC4h 55m
2026-07-07 KAL651 - Jul 7, 09:25 UTCJul 7, 14:25 UTC5h 0m
2026-07-06 KAL038 ORD → ICN Jul 6, 17:55 UTCJul 7, 07:25 UTC13h 30m
2026-07-06 KAL037 ICN → ORD Jul 6, 02:20 UTCJul 6, 14:30 UTC12h 10m
2026-07-05 KAL652 - Jul 5, 17:10 UTCJul 5, 22:10 UTC5h 0m
2026-07-05 KAL651 - Jul 5, 09:25 UTCJul 5, 14:25 UTC5h 0m
2026-07-04 KAL438 - Jul 4, 20:55 UTCJul 5, 01:40 UTC4h 45m
2026-07-04 KAL437 - Jul 4, 17:20 UTCJul 4, 17:35 UTC15m
2026-07-04 KAL437 - Jul 4, 11:05 UTCJul 4, 15:55 UTC4h 50m
2026-07-04 KAL926 - Jul 4, 06:50 UTCJul 4, 07:10 UTC20m
2026-07-03 KAL926 - Jul 3, 19:55 UTCJul 4, 06:00 UTC10h 5m
2026-07-03 KAL925 - Jul 3, 03:10 UTCJul 3, 16:20 UTC13h 10m
2026-07-02 KAL888 - Jul 2, 02:30 UTCJul 2, 07:40 UTC5h 10m
2026-07-01 KAL652 - Jul 1, 19:45 UTCJul 1, 22:45 UTC3h 0m
2026-07-01 KAL651 - Jul 1, 09:30 UTCJul 1, 12:00 UTC2h 30m
2026-07-01 KAL908 - Jul 1, 06:30 UTCJul 1, 06:55 UTC25m
2026-06-30 KAL908 - Jun 30, 19:00 UTCJul 1, 05:50 UTC10h 50m
2026-06-30 KAL907 - Jun 30, 03:45 UTCJun 30, 15:50 UTC12h 5m
2026-06-30 KAL907 - Jun 30, 02:35 UTCJun 30, 02:50 UTC15m
2026-06-28 KAL092 BOS → ICN Jun 28, 17:19 UTCJun 29, 07:59 UTC14h 40m
2026-06-28 KAL091 ICN → BOS Jun 28, 00:50 UTCJun 28, 14:04 UTC13h 15m
2026-06-27 KAL624 MNL → ICN Jun 27, 15:49 UTCJun 27, 19:00 UTC3h 10m
2026-06-27 KAL623 - Jun 27, 10:10 UTCJun 27, 13:35 UTC3h 25m
2026-06-26 KAL038 ORD → ICN Jun 26, 17:50 UTCJun 27, 07:39 UTC13h 50m
2026-06-26 KAL037 ICN → ORD Jun 26, 02:20 UTCJun 26, 14:19 UTC12h 0m
2026-06-24 KAL092 BOS → ICN Jun 24, 17:14 UTCJun 25, 07:49 UTC14h 35m
2026-06-24 KAL091 ICN → BOS Jun 24, 00:59 UTCJun 24, 14:15 UTC13h 15m
2026-06-23 KAL476 ICN → ICN Jun 23, 10:39 UTCJun 23, 21:54 UTC11h 15m
2026-06-22 KAL038 ORD → ICN Jun 22, 18:09 UTCJun 23, 07:29 UTC13h 20m
2026-06-22 KAL037 ICN → ORD Jun 22, 02:04 UTCJun 22, 14:10 UTC12h 5m
2026-06-21 KAL624 MNL → ICN Jun 21, 16:04 UTCJun 21, 19:09 UTC3h 5m
2026-06-21 KAL623 - Jun 21, 10:19 UTCJun 21, 13:44 UTC3h 25m
2026-06-20 KAL006 LAS → ICN Jun 20, 07:00 UTCJun 20, 18:49 UTC11h 50m
2026-06-19 KAL005 ICN → LAS Jun 19, 12:19 UTCJun 19, 23:19 UTC11h 0m
2026-06-19 KAL926 - Jun 19, 07:19 UTCJun 19, 07:45 UTC25m
2026-06-18 KAL926 - Jun 18, 20:00 UTCJun 18, 22:35 UTC2h 35m

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 3h ago.
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.