Apparatus

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sensors Mode-S transponder

71C531

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

Currently assigned to HL8531 · AIRBUS A-321neo

Hex
71C531
Octal
34342461
Decimal
7,456,049
Country
KR
Tail
HL8531
Type
A21N
Broadcasting now · callsign KAL2131 · 33,000 ft
Flights observed
322
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Current position

71C531 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C531 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
KAL2174 - 10 2026-07-09
KAL2171 - 10 2026-07-09
KAL2173 - 9 2026-07-09
KAL2172 - 9 2026-07-09
KAL2066 - 9 2026-06-26
KAL726 - 7 2026-07-11
KAL725 - 7 2026-07-11
KAL626 Korean Air 7 2026-06-11
KAL625 Korean Air 7 2026-06-11
KAL2190 - 7 2026-07-11
KAL851 - 6 2026-06-25
KAL656 - 6 2026-07-12
KAL655 - 6 2026-07-11
KAL2189 - 6 2026-07-10
KAL2016 - 6 2026-06-23
KAL742 - 5 2026-07-01
KAL712 - 5 2026-07-02
KAL711 - 5 2026-07-02
KAL690 - 5 2026-07-07
KAL2180 Korean Air 5 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL2130 - Jul 14, 03:50 UTCJul 14, 05:30 UTC1h 40m
2026-07-14 KAL2129 PUS → NRT Jul 14, 00:40 UTCJul 14, 02:20 UTC1h 40m
2026-07-13 KAL2132 NRT → PUS Jul 13, 10:35 UTCJul 13, 12:10 UTC1h 35m
2026-07-13 KAL2131 - Jul 13, 07:05 UTCJul 13, 09:00 UTC1h 55m
2026-07-13 KAL2130 - Jul 13, 04:05 UTCJul 13, 05:40 UTC1h 35m
2026-07-13 KAL2129 - Jul 13, 00:50 UTCJul 13, 02:40 UTC1h 50m
2026-07-12 KAL1401 ICN → PUS Jul 12, 21:50 UTCJul 12, 22:30 UTC40m
2026-07-12 KAL457 ICN → ICN Jul 12, 03:25 UTCJul 12, 13:10 UTC9h 45m
2026-07-12 KAL656 - Jul 12, 01:00 UTCJul 12, 01:20 UTC20m
2026-07-11 KAL656 - Jul 11, 21:25 UTCJul 11, 21:45 UTC20m
2026-07-11 KAL656 - Jul 11, 20:05 UTCJul 11, 20:20 UTC15m
2026-07-11 KAL655 - Jul 11, 17:55 UTCJul 11, 18:05 UTC10m
2026-07-11 KAL655 - Jul 11, 16:35 UTCJul 11, 16:50 UTC15m
2026-07-11 KAL655 - Jul 11, 13:05 UTCJul 11, 13:25 UTC20m
2026-07-11 KAL726 KIX → ICN Jul 11, 09:45 UTCJul 11, 11:05 UTC1h 20m
2026-07-11 KAL725 ICN → KIX Jul 11, 06:40 UTCJul 11, 08:10 UTC1h 30m
2026-07-11 KAL2190 - Jul 11, 01:25 UTCJul 11, 02:50 UTC1h 25m
2026-07-10 KAL2189 - Jul 10, 22:45 UTCJul 11, 00:05 UTC1h 20m
2026-07-10 KAL726 KIX → ICN Jul 10, 09:35 UTCJul 10, 11:00 UTC1h 25m
2026-07-10 KAL725 - Jul 10, 06:20 UTCJul 10, 07:45 UTC1h 25m
2026-07-09 KAL2174 UKB → ICN Jul 9, 10:15 UTCJul 9, 11:40 UTC1h 25m
2026-07-09 KAL2173 ICN → UKB Jul 9, 07:05 UTCJul 9, 08:25 UTC1h 20m
2026-07-09 KAL2172 UKB → ICN Jul 9, 03:15 UTCJul 9, 04:45 UTC1h 30m
2026-07-09 KAL2171 ICN → UKB Jul 9, 00:20 UTCJul 9, 01:45 UTC1h 25m
2026-07-08 KAL457 ICN → ICN Jul 8, 03:10 UTCJul 8, 13:25 UTC10h 15m
2026-07-07 KAL690 ICN → ICN Jul 7, 10:20 UTCJul 7, 22:05 UTC11h 45m
2026-07-07 KAL1408 PUS → ICN Jul 7, 01:45 UTCJul 7, 02:30 UTC45m
2026-07-06 KAL1403 ICN → PUS Jul 6, 23:40 UTCJul 7, 00:20 UTC40m
2026-07-06 KAL738 KIX → ICN Jul 6, 17:20 UTCJul 6, 18:45 UTC1h 25m
2026-07-06 KAL737 ICN → KIX Jul 6, 12:30 UTCJul 6, 13:45 UTC1h 15m
2026-07-06 KAL102 - Jul 6, 06:45 UTCJul 6, 07:10 UTC25m
2026-07-06 KAL101 - Jul 6, 01:45 UTCJul 6, 02:20 UTC35m
2026-07-05 KAL726 KIX → ICN Jul 5, 09:40 UTCJul 5, 11:10 UTC1h 30m
2026-07-05 KAL725 - Jul 5, 06:40 UTCJul 5, 08:05 UTC1h 25m
2026-07-05 KAL2190 - Jul 5, 01:35 UTCJul 5, 03:10 UTC1h 35m
2026-07-04 KAL2189 - Jul 4, 22:50 UTCJul 5, 00:05 UTC1h 15m
2026-07-04 KAL417 ICN → ICN Jul 4, 09:45 UTCJul 4, 20:40 UTC10h 55m
2026-07-03 KAL726 - Jul 3, 09:40 UTCJul 3, 11:05 UTC1h 25m
2026-07-03 KAL725 ICN → KIX Jul 3, 06:35 UTCJul 3, 07:55 UTC1h 20m
2026-07-03 KAL1408 PUS → ICN Jul 3, 01:45 UTCJul 3, 02:25 UTC40m
2026-07-02 KAL1403 - Jul 2, 23:50 UTCJul 3, 00:40 UTC50m
2026-07-02 KAL712 - Jul 2, 08:35 UTCJul 2, 10:40 UTC2h 5m
2026-07-02 KAL711 - Jul 2, 04:30 UTCJul 2, 06:25 UTC1h 55m
2026-07-01 KAL1406 PUS → ICN Jul 1, 23:45 UTCJul 2, 00:30 UTC45m
2026-07-01 KAL1401 - Jul 1, 21:45 UTCJul 1, 22:20 UTC35m
2026-07-01 KAL2198 - Jul 1, 11:25 UTCJul 1, 13:15 UTC1h 50m
2026-07-01 KAL2197 - Jul 1, 08:25 UTCJul 1, 09:35 UTC1h 10m
2026-07-01 KAL742 - Jul 1, 05:00 UTCJul 1, 06:30 UTC1h 30m
2026-07-01 KAL741 - Jul 1, 01:50 UTCJul 1, 03:10 UTC1h 20m
2026-06-30 KAL486 - Jun 30, 10:25 UTCJun 30, 23:05 UTC12h 40m

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 HL8531 page for operator, model, and routing details .

Mode-S 71C531 frequently asked

What is Mode-S code 71C531?
71C531 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8531.
Where is Mode-S 71C531 registered?
Mode-S code 71C531 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 71C531 broadcasting right now?
Yes. Mode-S 71C531 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C531, octal 34342461, decimal 7,456,049.
What flights does 71C531 operate?
Mode-S 71C531 has broadcast 20 distinct callsigns, including KAL2174, KAL2171, KAL2173, KAL2172, KAL2066.