Apparatus

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sensors Mode-S transponder

71C524

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

Currently assigned to HL8524 · BOEING 737 MAX 8

Hex
71C524
Octal
34342444
Decimal
7,456,036
Country
KR
Tail
HL8524
Type
B38M
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
489
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S 71C524.

Country allocation

The ICAO 24-bit address 71C524 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
JJA1802 Jeju Air 23 2026-07-21
JJA1107 Jeju Air 21 2026-07-24
JJA8502 Jeju Air 20 2026-07-20
JJA1302 Jeju Air 20 2026-07-21
JJA1301 Jeju Air 20 2026-07-20
JJA8501 - 19 2026-07-20
JJA6101 Jeju Air 19 2026-07-26
JJA1801 Jeju Air 18 2026-07-21
JJA1108 Jeju Air 18 2026-07-24
JJA2504 - 17 2026-07-18
JJA6102 Jeju Air 16 2026-07-26
JJA6013 Jeju Air 16 2026-07-17
JJA2503 - 15 2026-07-18
JJA1406 Jeju Air 13 2026-07-25
JJA1405 Jeju Air 13 2026-07-25
JJA1404 Jeju Air 13 2026-07-24
JJA1203 Jeju Air 13 2026-07-19
JJA1403 Jeju Air 12 2026-07-24
JJA1204 Jeju Air 12 2026-07-19
JJA1308 - 11 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA2315 ICN → PQC Jul 26, 09:10 UTCJul 26, 20:50 UTC11h 40m
2026-07-26 JJA6102 TPE → ICN Jul 26, 04:05 UTCJul 26, 06:15 UTC2h 10m
2026-07-26 JJA6101 ICN → TPE Jul 26, 00:25 UTCJul 26, 02:25 UTC2h 0m
2026-07-25 JJA2114 CEB → ICN Jul 25, 12:20 UTCJul 25, 22:20 UTC10h 0m
2026-07-25 JJA1406 FUK → ICN Jul 25, 09:00 UTCJul 25, 10:00 UTC1h 0m
2026-07-25 JJA1405 ICN → FUK Jul 25, 06:30 UTCJul 25, 07:25 UTC55m
2026-07-25 JJA1502 CTS → ICN Jul 25, 02:05 UTCJul 25, 04:30 UTC2h 25m
2026-07-24 JJA1501 ICN → CTS Jul 24, 22:25 UTCJul 25, 00:45 UTC2h 20m
2026-07-24 JJA1108 NRT → ICN Jul 24, 10:25 UTCJul 24, 12:25 UTC2h 0m
2026-07-24 JJA1107 NRT → ICN Jul 24, 06:55 UTCJul 24, 08:50 UTC1h 55m
2026-07-24 JJA1404 FUK → ICN Jul 24, 03:50 UTCJul 24, 04:40 UTC50m
2026-07-24 JJA1403 ICN → FUK Jul 24, 01:20 UTCJul 24, 02:15 UTC55m
2026-07-23 JJA2624 SIN → ICN Jul 23, 20:25 UTCJul 23, 23:30 UTC3h 5m
2026-07-23 JJA2624 SIN → ICN Jul 23, 17:20 UTCJul 23, 17:30 UTC10m
2026-07-23 JJA2623 - Jul 23, 15:10 UTCJul 23, 15:30 UTC20m
2026-07-23 JJA2623 - Jul 23, 09:40 UTCJul 23, 12:25 UTC2h 45m
2026-07-23 JJA2623 ICN → ICN Jul 23, 09:15 UTCJul 23, 09:20 UTC5m
2026-07-23 JJA1176 NRT → ICN Jul 23, 04:50 UTCJul 23, 06:45 UTC1h 55m
2026-07-23 JJA1175 NRT → PUS Jul 23, 01:15 UTCJul 23, 03:20 UTC2h 5m
2026-07-22 JJA2316 PQC → ICN Jul 22, 04:50 UTCJul 22, 20:40 UTC15h 50m
2026-07-22 JJA6101 ICN → TPE Jul 22, 02:55 UTCJul 22, 03:15 UTC20m
2026-07-22 JJA6101 ICN → TPE Jul 22, 01:05 UTCJul 22, 01:45 UTC40m
2026-07-21 JJA2114 ICN → ICN Jul 21, 12:20 UTCJul 21, 22:20 UTC10h 0m
2026-07-21 JJA1802 OKA → ICN Jul 21, 08:50 UTCJul 21, 10:35 UTC1h 45m
2026-07-21 JJA1801 ICN → OKA Jul 21, 07:05 UTCJul 21, 07:25 UTC20m
2026-07-21 JJA1801 ICN → OKA Jul 21, 05:40 UTCJul 21, 06:15 UTC35m
2026-07-21 JJA1302 ICN → KIX Jul 21, 02:15 UTCJul 21, 03:35 UTC1h 20m
2026-07-20 JJA1301 KIX → ICN Jul 20, 22:30 UTCJul 20, 23:50 UTC1h 20m
2026-07-20 JJA1108 NRT → ICN Jul 20, 10:10 UTCJul 20, 12:10 UTC2h 0m
2026-07-20 JJA1107 NRT → ICN Jul 20, 06:40 UTCJul 20, 08:35 UTC1h 55m
2026-07-20 JJA8502 WEH → ICN Jul 20, 04:25 UTCJul 20, 04:50 UTC25m
2026-07-20 JJA8501 - Jul 20, 02:00 UTCJul 20, 02:15 UTC15m
2026-07-19 JJA2304 - Jul 19, 22:50 UTCJul 19, 23:25 UTC35m
2026-07-19 JJA2303 ICN → CXR Jul 19, 13:10 UTCJul 19, 21:45 UTC8h 35m
2026-07-19 JJA1204 NGO → ICN Jul 19, 09:20 UTCJul 19, 10:40 UTC1h 20m
2026-07-19 JJA1203 ICN → NGO Jul 19, 06:20 UTCJul 19, 07:40 UTC1h 20m
2026-07-19 JJA8502 - Jul 19, 04:20 UTCJul 19, 04:50 UTC30m
2026-07-19 JJA8501 - Jul 19, 01:50 UTCJul 19, 02:15 UTC25m
2026-07-18 JJA2504 - Jul 18, 20:55 UTCJul 18, 23:55 UTC3h 0m
2026-07-18 JJA2504 - Jul 18, 18:40 UTCJul 18, 18:50 UTC10m
2026-07-18 JJA2503 - Jul 18, 11:45 UTCJul 18, 14:40 UTC2h 55m
2026-07-18 JJA1802 - Jul 18, 08:10 UTCJul 18, 09:50 UTC1h 40m
2026-07-18 JJA1801 - Jul 18, 04:45 UTCJul 18, 06:30 UTC1h 45m
2026-07-18 JJA1302 KIX → ICN Jul 18, 01:20 UTCJul 18, 02:35 UTC1h 15m
2026-07-17 JJA1301 KIX → ICN Jul 17, 22:20 UTCJul 17, 23:39 UTC1h 20m
2026-07-17 JJA6014 - Jul 17, 19:49 UTCJul 17, 20:35 UTC45m
2026-07-17 JJA6014 - Jul 17, 17:15 UTCJul 17, 18:44 UTC1h 30m
2026-07-17 JJA6013 ICN → HKG Jul 17, 12:19 UTCJul 17, 15:35 UTC3h 15m
2026-07-17 JJA1406 - Jul 17, 09:10 UTCJul 17, 10:05 UTC55m
2026-07-17 JJA1405 - Jul 17, 06:35 UTCJul 17, 07:25 UTC50m

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 HL8524 page for operator, model, and routing details .

Mode-S 71C524 frequently asked

What is Mode-S code 71C524?
71C524 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8524.
Where is Mode-S 71C524 registered?
Mode-S code 71C524 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 71C524 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C524, octal 34342444, decimal 7,456,036.
What flights does 71C524 operate?
Mode-S 71C524 has broadcast 20 distinct callsigns, including JJA1802, JJA1107, JJA8502, JJA1302, JJA1301.