Apparatus

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sensors Mode-S transponder

71C597

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

Currently assigned to HL8597 · AIRBUS A-350-900

Hex
71C597
Octal
34342627
Decimal
7,456,151
Country
KR
Tail
HL8597
Type
A359
No current signal · last broadcast Jul 26, 07:45 UTC
Flights observed
206
Distinct callsigns
12
Country
KR
Last broadcast
Jul 26, 07:45 UTC

Last known position

Most recent position reported by Mode-S 71C597.

Country allocation

The ICAO 24-bit address 71C597 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 12 distinct

Callsign Airline Flights Last seen
KAL077 Korean Air 48 2026-07-25
KAL078 Korean Air 44 2026-07-25
KAL932 Korean Air 28 2026-07-23
KAL931 Korean Air 21 2026-07-22
KAL752 Korean Air 20 2026-07-24
KAL751 Korean Air 20 2026-07-24
KAL2011 Korean Air 12 2026-05-06
KAL2012 Korean Air 8 2026-05-06
KAL2021 Korean Air 2 2026-07-24
KE752 Korean Air 1 2026-05-24
KE751 Korean Air 1 2026-05-24
KAL2022 Korean Air 1 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 KAL078 YYZ → ICN Jul 25, 17:15 UTCJul 26, 07:45 UTC14h 31m
2026-07-25 KAL077 ICN → YYZ Jul 25, 01:00 UTCJul 25, 13:40 UTC12h 40m
2026-07-24 KAL752 NGO → ICN Jul 24, 17:20 UTCJul 24, 19:05 UTC1h 45m
2026-07-24 KAL751 ICN → NGO Jul 24, 11:55 UTCJul 24, 13:55 UTC2h 0m
2026-07-24 KAL2022 TPE → ICN Jul 24, 05:45 UTCJul 24, 07:50 UTC2h 5m
2026-07-24 KAL2021 ICN → TPE Jul 24, 03:45 UTCJul 24, 04:05 UTC20m
2026-07-24 KAL2021 ICN → TPE Jul 24, 02:00 UTCJul 24, 02:35 UTC35m
2026-07-23 KAL752 NGO → ICN Jul 23, 17:25 UTCJul 23, 19:15 UTC1h 50m
2026-07-23 KAL751 ICN → HND Jul 23, 11:50 UTCJul 23, 13:40 UTC1h 50m
2026-07-23 KAL932 FCO → ICN Jul 23, 07:10 UTCJul 23, 07:35 UTC25m
2026-07-22 KAL932 FCO → ICN Jul 22, 21:05 UTCJul 23, 06:25 UTC9h 20m
2026-07-22 KAL931 ICN → FCO Jul 22, 14:15 UTCJul 22, 18:25 UTC4h 10m
2026-07-20 KAL078 YYZ → ICN Jul 20, 17:10 UTCJul 21, 07:10 UTC13h 59m
2026-07-20 KAL077 ICN → YYZ Jul 20, 01:15 UTCJul 20, 14:05 UTC12h 50m
2026-07-19 KAL932 - Jul 19, 05:40 UTCJul 19, 06:05 UTC25m
2026-07-18 KAL932 - Jul 18, 19:50 UTCJul 19, 04:50 UTC9h 0m
2026-07-18 KAL931 ICN → FCO Jul 18, 06:05 UTCJul 18, 17:20 UTC11h 15m
2026-07-18 KAL931 ICN → FCO Jul 18, 04:55 UTCJul 18, 05:15 UTC20m
2026-07-16 KAL078 YYZ → ICN Jul 16, 17:14 UTCJul 17, 06:45 UTC13h 30m
2026-07-16 KAL077 ICN → YYZ Jul 16, 01:05 UTCJul 16, 13:25 UTC12h 20m
2026-07-15 KAL752 HND → ICN Jul 15, 17:20 UTCJul 15, 19:15 UTC1h 55m
2026-07-15 KAL751 ICN → HND Jul 15, 12:00 UTCJul 15, 13:50 UTC1h 50m
2026-07-14 KAL078 YYZ → ICN Jul 14, 17:10 UTCJul 15, 07:00 UTC13h 49m
2026-07-14 KAL077 ICN → YYZ Jul 14, 01:20 UTCJul 14, 13:35 UTC12h 15m
2026-07-08 KAL078 YYZ → ICN Jul 8, 17:20 UTCJul 9, 06:55 UTC13h 35m
2026-07-08 KAL077 ICN → YYZ Jul 8, 01:10 UTCJul 8, 13:50 UTC12h 40m
2026-07-07 KAL932 - Jul 7, 06:45 UTCJul 7, 07:05 UTC20m
2026-07-06 KAL932 - Jul 6, 20:20 UTCJul 7, 05:50 UTC9h 30m
2026-07-06 KAL931 - Jul 6, 05:25 UTCJul 6, 17:45 UTC12h 20m
2026-07-05 KAL932 - Jul 5, 05:55 UTCJul 5, 06:20 UTC25m
2026-07-04 KAL932 - Jul 4, 19:55 UTCJul 5, 05:10 UTC9h 15m
2026-07-04 KAL931 - Jul 4, 06:00 UTCJul 4, 17:10 UTC11h 10m
2026-07-04 KAL931 - Jul 4, 04:55 UTCJul 4, 05:10 UTC15m
2026-07-02 KAL078 YYZ → ICN Jul 2, 17:10 UTCJul 3, 06:40 UTC13h 30m
2026-07-02 KAL077 ICN → YYZ Jul 2, 01:20 UTCJul 2, 13:45 UTC12h 25m
2026-07-01 KAL752 HND → ICN Jul 1, 17:25 UTCJul 1, 19:25 UTC2h 0m
2026-07-01 KAL751 ICN → HND Jul 1, 11:50 UTCJul 1, 13:40 UTC1h 50m
2026-06-30 KAL078 YYZ → ICN Jun 30, 17:05 UTCJul 1, 06:40 UTC13h 35m
2026-06-30 KAL077 ICN → YYZ Jun 30, 01:04 UTCJun 30, 13:40 UTC12h 36m
2026-06-29 KAL752 - Jun 29, 17:14 UTCJun 29, 19:05 UTC1h 50m
2026-06-29 KAL751 ICN → HND Jun 29, 11:50 UTCJun 29, 13:39 UTC1h 50m
2026-06-28 KAL078 YYZ → ICN Jun 28, 17:10 UTCJun 29, 07:09 UTC14h 0m
2026-06-28 KAL077 ICN → YYZ Jun 28, 01:04 UTCJun 28, 13:19 UTC12h 15m
2026-06-27 KAL752 HND → ICN Jun 27, 17:20 UTCJun 27, 19:09 UTC1h 50m
2026-06-27 KAL751 ICN → HND Jun 27, 11:44 UTCJun 27, 13:30 UTC1h 45m
2026-06-26 KAL078 - Jun 26, 17:19 UTCJun 27, 07:24 UTC14h 5m
2026-06-26 KAL077 ICN → YYZ Jun 26, 01:10 UTCJun 26, 13:34 UTC12h 25m
2026-06-25 KAL752 HND → ICN Jun 25, 17:20 UTCJun 25, 19:09 UTC1h 50m
2026-06-25 KAL751 ICN → HND Jun 25, 11:44 UTCJun 25, 13:29 UTC1h 45m
2026-06-24 KAL078 YYZ → ICN Jun 24, 17:10 UTCJun 25, 06:55 UTC13h 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 HL8597 page for operator, model, and routing details .

Mode-S 71C597 frequently asked

What is Mode-S code 71C597?
71C597 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8597.
Where is Mode-S 71C597 registered?
Mode-S code 71C597 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 71C597 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 07:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C597, octal 34342627, decimal 7,456,151.
What flights does 71C597 operate?
Mode-S 71C597 has broadcast 12 distinct callsigns, including KAL077, KAL078, KAL932, KAL931, KAL752.