Apparatus

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sensors Mode-S transponder

71C559

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

Currently assigned to HL8559 · AIRBUS A-321neo

Hex
71C559
Octal
34342531
Decimal
7,456,089
Country
KR
Tail
HL8559
Type
A21N
No current signal · last broadcast 6h ago
Flights observed
350
Distinct callsigns
20
Country
KR
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 71C559.

Country allocation

The ICAO 24-bit address 71C559 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
KAL737 - 11 2026-07-05
KAL2005 - 11 2026-07-13
KAL1406 - 11 2026-07-13
KAL738 - 10 2026-07-05
KAL2147 - 10 2026-07-06
KAL792 - 9 2026-07-14
KAL791 - 9 2026-07-14
KAL485 - 9 2026-07-10
KAL1401 - 9 2026-07-11
KAL2174 Korean Air 8 2026-06-11
KAL2173 Korean Air 8 2026-06-11
KAL2172 Korean Air 8 2026-06-11
KAL2148 - 8 2026-07-06
KAL2016 - 8 2026-07-05
KAL2006 - 8 2026-07-13
KAL1403 - 8 2026-06-29
KAL741 Korean Air 7 2026-05-25
KAL2180 - 7 2026-06-18
KAL2171 Korean Air 7 2026-06-11
KAL1408 - 7 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL417 - Jul 14, 09:45 UTCJul 14, 10:45 UTC1h 0m
2026-07-14 KAL792 - Jul 14, 06:10 UTCJul 14, 07:10 UTC1h 0m
2026-07-14 KAL791 - Jul 14, 02:20 UTCJul 14, 03:20 UTC1h 0m
2026-07-13 KAL2006 - Jul 13, 10:20 UTCJul 13, 13:35 UTC3h 15m
2026-07-13 KAL2005 - Jul 13, 04:45 UTCJul 13, 07:55 UTC3h 10m
2026-07-13 KAL1406 PUS → ICN Jul 13, 00:05 UTCJul 13, 00:50 UTC45m
2026-07-12 KAL1407 ICN → PUS Jul 12, 09:50 UTCJul 12, 10:30 UTC40m
2026-07-12 KAL792 - Jul 12, 06:15 UTCJul 12, 07:15 UTC1h 0m
2026-07-12 KAL791 - Jul 12, 02:30 UTCJul 12, 03:15 UTC45m
2026-07-12 KAL1406 PUS → ICN Jul 12, 00:01 UTCJul 12, 00:45 UTC45m
2026-07-11 KAL1401 ICN → PUS Jul 11, 21:50 UTCJul 11, 22:30 UTC40m
2026-07-11 KAL772 - Jul 11, 12:10 UTCJul 11, 14:30 UTC2h 20m
2026-07-11 KAL771 - Jul 11, 08:20 UTCJul 11, 10:45 UTC2h 25m
2026-07-10 KAL486 - Jul 10, 22:30 UTCJul 10, 22:50 UTC20m
2026-07-10 KAL485 - Jul 10, 10:50 UTCJul 10, 19:10 UTC8h 20m
2026-07-09 KAL690 - Jul 9, 10:50 UTCJul 9, 22:35 UTC11h 45m
2026-07-09 KAL142 - Jul 9, 07:10 UTCJul 9, 07:35 UTC25m
2026-07-09 KAL141 - Jul 9, 00:25 UTCJul 9, 06:20 UTC5h 55m
2026-07-08 KAL690 - Jul 8, 10:25 UTCJul 8, 22:00 UTC11h 35m
2026-07-08 KAL792 - Jul 8, 06:25 UTCJul 8, 07:20 UTC55m
2026-07-08 KAL791 - Jul 8, 03:05 UTCJul 8, 03:55 UTC50m
2026-07-07 KAL458 ICN → ICN Jul 7, 03:10 UTCJul 7, 13:25 UTC10h 15m
2026-07-06 KAL1406 PUS → ICN Jul 6, 23:50 UTCJul 7, 00:45 UTC55m
2026-07-06 KAL1401 ICN → PUS Jul 6, 21:50 UTCJul 6, 22:30 UTC40m
2026-07-06 KAL2198 - Jul 6, 11:30 UTCJul 6, 13:15 UTC1h 45m
2026-07-06 KAL2197 - Jul 6, 08:25 UTCJul 6, 09:50 UTC1h 25m
2026-07-06 KAL2148 - Jul 6, 05:05 UTCJul 6, 06:55 UTC1h 50m
2026-07-06 KAL2147 - Jul 6, 01:35 UTCJul 6, 03:25 UTC1h 50m
2026-07-05 KAL738 KIX → ICN Jul 5, 17:25 UTCJul 5, 18:55 UTC1h 30m
2026-07-05 KAL737 ICN → KIX Jul 5, 12:10 UTCJul 5, 13:35 UTC1h 25m
2026-07-05 KAL2016 - Jul 5, 07:10 UTCJul 5, 10:20 UTC3h 10m
2026-07-05 KAL2015 - Jul 5, 02:00 UTCJul 5, 05:10 UTC3h 10m
2026-07-04 KAL485 ICN → ICN Jul 4, 10:25 UTCJul 4, 22:45 UTC12h 20m
2026-07-04 KAL2148 - Jul 4, 04:15 UTCJul 4, 06:00 UTC1h 45m
2026-07-04 KAL2147 - Jul 4, 00:45 UTCJul 4, 02:30 UTC1h 45m
2026-07-03 KAL418 ICN → ICN Jul 3, 09:55 UTCJul 3, 20:55 UTC11h 0m
2026-07-03 KAL856 - Jul 3, 07:00 UTCJul 3, 07:20 UTC20m
2026-07-03 KAL855 - Jul 3, 01:55 UTCJul 3, 02:15 UTC20m
2026-07-02 KAL418 ICN → ICN Jul 2, 09:45 UTCJul 2, 20:25 UTC10h 40m
2026-07-02 KAL2148 - Jul 2, 04:30 UTCJul 2, 06:00 UTC1h 30m
2026-07-02 KAL2147 - Jul 2, 02:20 UTCJul 2, 02:45 UTC25m
2026-07-02 KAL2147 - Jul 2, 01:00 UTCJul 2, 01:30 UTC30m
2026-07-01 KAL738 KIX → ICN Jul 1, 17:30 UTCJul 1, 19:05 UTC1h 35m
2026-07-01 KAL737 ICN → KIX Jul 1, 12:05 UTCJul 1, 13:30 UTC1h 25m
2026-07-01 KAL770 - Jul 1, 07:30 UTCJul 1, 10:00 UTC2h 30m
2026-07-01 KAL769 ICN → CTS Jul 1, 03:55 UTCJul 1, 06:05 UTC2h 10m
2026-06-30 KAL1406 PUS → ICN Jun 30, 23:50 UTCJul 1, 00:35 UTC45m
2026-06-30 KAL1401 ICN → PUS Jun 30, 21:45 UTCJun 30, 22:35 UTC50m
2026-06-30 KAL2006 HKG → ICN Jun 30, 10:20 UTCJun 30, 13:25 UTC3h 5m
2026-06-30 KAL2005 - Jun 30, 07:50 UTCJun 30, 08:15 UTC25m

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 HL8559 page for operator, model, and routing details .

Mode-S 71C559 frequently asked

What is Mode-S code 71C559?
71C559 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8559.
Where is Mode-S 71C559 registered?
Mode-S code 71C559 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 71C559 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C559, octal 34342531, decimal 7,456,089.
What flights does 71C559 operate?
Mode-S 71C559 has broadcast 20 distinct callsigns, including KAL737, KAL2005, KAL1406, KAL738, KAL2147.