Apparatus

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sensors Mode-S transponder

71C274

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

Currently assigned to HL8274 · BOEING 777-300ER

Hex
71C274
Octal
34341164
Decimal
7,455,348
Country
KR
Tail
HL8274
Type
B77W
Broadcasting now · callsign KAL038 · 36,000 ft
Flights observed
217
Distinct callsigns
20
Country
KR
Last broadcast
5h ago

Current position

71C274 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C274 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
KAL926 - 17 2026-06-29
KAL092 - 17 2026-07-10
KAL652 - 15 2026-07-13
KAL038 - 15 2026-07-14
KAL651 - 14 2026-07-13
KAL037 - 14 2026-07-14
KAL946 - 12 2026-07-13
KAL925 - 12 2026-06-28
KAL945 - 11 2026-07-12
KAL091 - 10 2026-07-10
KAL623 - 9 2026-06-30
KAL624 - 8 2026-06-30
KAL476 - 7 2026-07-08
KAL622 - 6 2026-06-25
KAL788 Korean Air 5 2026-05-13
KAL787 Korean Air 5 2026-05-12
KAL621 - 5 2026-06-24
KAL645 Korean Air 3 2026-05-20
KAL643 Korean Air 3 2026-05-05
KAL475 - 3 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL038 - Jul 14, 17:45 UTCJul 15, 00:40 UTC6h 54m
2026-07-14 KAL037 ICN → ORD Jul 14, 02:10 UTCJul 14, 14:35 UTC12h 25m
2026-07-13 KAL652 - Jul 13, 19:20 UTCJul 13, 22:05 UTC2h 45m
2026-07-13 KAL652 - Jul 13, 17:10 UTCJul 13, 17:20 UTC10m
2026-07-13 KAL651 - Jul 13, 09:30 UTCJul 13, 12:10 UTC2h 40m
2026-07-13 KAL946 - Jul 13, 05:10 UTCJul 13, 05:35 UTC25m
2026-07-12 KAL946 - Jul 12, 18:30 UTCJul 13, 04:15 UTC9h 45m
2026-07-12 KAL945 - Jul 12, 03:20 UTCJul 12, 14:50 UTC11h 30m
2026-07-12 KAL945 - Jul 12, 02:15 UTCJul 12, 02:30 UTC15m
2026-07-10 KAL092 BOS → ICN Jul 10, 17:35 UTCJul 11, 07:30 UTC13h 56m
2026-07-10 KAL091 ICN → BOS Jul 10, 00:50 UTCJul 10, 14:30 UTC13h 40m
2026-07-09 KAL658 - Jul 9, 15:05 UTCJul 9, 20:00 UTC4h 55m
2026-07-09 KAL657 - Jul 9, 01:30 UTCJul 9, 06:30 UTC5h 0m
2026-07-08 KAL476 - Jul 8, 12:05 UTCJul 8, 21:50 UTC9h 45m
2026-07-08 KAL475 - Jul 8, 10:35 UTCJul 8, 11:05 UTC30m
2026-07-07 KAL092 BOS → ICN Jul 7, 17:40 UTCJul 8, 07:55 UTC14h 15m
2026-07-07 KAL091 ICN → BOS Jul 7, 01:00 UTCJul 7, 14:45 UTC13h 45m
2026-07-06 KAL652 - Jul 6, 16:55 UTCJul 6, 21:55 UTC5h 0m
2026-07-06 KAL651 - Jul 6, 09:30 UTCJul 6, 14:30 UTC5h 0m
2026-07-06 KAL946 - Jul 6, 04:40 UTCJul 6, 05:00 UTC20m
2026-07-05 KAL946 - Jul 5, 18:10 UTCJul 6, 03:50 UTC9h 40m
2026-07-05 KAL945 - Jul 5, 03:35 UTCJul 5, 11:50 UTC8h 15m
2026-07-05 KAL945 - Jul 5, 02:20 UTCJul 5, 02:40 UTC20m
2026-07-03 KAL038 ORD → ICN Jul 3, 20:45 UTCJul 4, 09:35 UTC12h 50m
2026-07-03 KAL037 - Jul 3, 02:10 UTCJul 3, 14:45 UTC12h 35m
2026-07-02 KAL476 - Jul 2, 10:35 UTCJul 2, 22:05 UTC11h 30m
2026-07-02 KAL2022 TPE → ICN Jul 2, 05:35 UTCJul 2, 07:30 UTC1h 55m
2026-07-02 KAL2021 - Jul 2, 01:45 UTCJul 2, 03:45 UTC2h 0m
2026-06-30 KAL624 - Jun 30, 16:00 UTCJun 30, 19:20 UTC3h 20m
2026-06-30 KAL623 ICN → MNL Jun 30, 10:45 UTCJun 30, 14:10 UTC3h 25m
2026-06-30 KAL844 - Jun 30, 08:35 UTCJun 30, 08:55 UTC20m
2026-06-30 KAL843 - Jun 30, 04:35 UTCJun 30, 04:45 UTC10m
2026-06-29 KAL624 - Jun 29, 15:49 UTCJun 29, 19:09 UTC3h 20m
2026-06-29 KAL623 - Jun 29, 10:24 UTCJun 29, 13:59 UTC3h 35m
2026-06-29 KAL926 - Jun 29, 07:40 UTCJun 29, 08:04 UTC25m
2026-06-28 KAL926 - Jun 28, 20:54 UTCJun 28, 23:09 UTC2h 15m
2026-06-28 KAL925 - Jun 28, 03:14 UTCJun 28, 16:25 UTC13h 10m
2026-06-27 KAL476 - Jun 27, 10:40 UTCJun 27, 22:04 UTC11h 25m
2026-06-27 KAL926 - Jun 27, 07:39 UTCJun 27, 08:05 UTC25m
2026-06-26 KAL926 - Jun 26, 20:44 UTCJun 27, 06:50 UTC10h 5m
2026-06-26 KAL925 - Jun 26, 04:24 UTCJun 26, 16:20 UTC11h 55m
2026-06-26 KAL925 - Jun 26, 03:15 UTCJun 26, 03:24 UTC10m
2026-06-25 KAL624 - Jun 25, 15:54 UTCJun 25, 19:24 UTC3h 30m
2026-06-25 KAL623 - Jun 25, 12:10 UTCJun 25, 13:45 UTC1h 35m
2026-06-25 KAL623 - Jun 25, 10:20 UTCJun 25, 10:55 UTC35m
2026-06-25 KAL622 - Jun 25, 04:45 UTCJun 25, 08:09 UTC3h 25m
2026-06-24 KAL621 - Jun 24, 23:04 UTCJun 25, 02:30 UTC3h 25m
2026-06-24 KAL624 - Jun 24, 16:09 UTCJun 24, 19:29 UTC3h 20m
2026-06-24 KAL623 - Jun 24, 10:25 UTCJun 24, 13:44 UTC3h 20m
2026-06-24 KAL622 - Jun 24, 04:34 UTCJun 24, 07:59 UTC3h 25m

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 HL8274 page for operator, model, and routing details .

Mode-S 71C274 frequently asked

What is Mode-S code 71C274?
71C274 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8274.
Where is Mode-S 71C274 registered?
Mode-S code 71C274 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 71C274 broadcasting right now?
Yes. Mode-S 71C274 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C274, octal 34341164, decimal 7,455,348.
What flights does 71C274 operate?
Mode-S 71C274 has broadcast 20 distinct callsigns, including KAL926, KAL092, KAL652, KAL038, KAL651.