Apparatus

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sensors Mode-S transponder

71C594

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

Currently assigned to HL8594 · BOEING 737 MAX 8

Hex
71C594
Octal
34342624
Decimal
7,456,148
Country
KR
Tail
HL8594
Type
B38M
No current signal · last broadcast 14h ago
Flights observed
215
Distinct callsigns
20
Country
KR
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 71C594.

Country allocation

The ICAO 24-bit address 71C594 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
JJA1203 Jeju Air 14 2026-05-09
JJA6102 Jeju Air 12 2026-05-27
JJA6101 Jeju Air 12 2026-05-27
JJA1802 Jeju Air 11 2026-05-28
JJA1204 Jeju Air 9 2026-05-09
JJA2503 Jeju Air 8 2026-05-28
JJA1302 Jeju Air 8 2026-05-28
JJA1301 Jeju Air 8 2026-05-27
JJA1108 Jeju Air 8 2026-05-29
JJA1107 Jeju Air 8 2026-05-29
JJA8502 Jeju Air 7 2026-05-29
JJA2504 Jeju Air 7 2026-05-28
JJA1404 Jeju Air 7 2026-05-10
JJA1154 Jeju Air 7 2026-05-07
JJA1801 Jeju Air 6 2026-05-17
JJA1403 Jeju Air 6 2026-05-10
JJA8501 Jeju Air 5 2026-05-29
JJA2661 Jeju Air 5 2026-05-07
JJA1307 Jeju Air 5 2026-05-26
JJA1153 Jeju Air 5 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JJA1108 NRT → ICN May 29, 09:55 UTCMay 29, 12:10 UTC2h 15m
2026-05-29 JJA1107 NRT → ICN May 29, 06:20 UTCMay 29, 08:05 UTC1h 45m
2026-05-29 JJA8502 WEH → ICN May 29, 04:25 UTCMay 29, 04:50 UTC25m
2026-05-29 JJA8501 ICN → WEH May 29, 01:55 UTCMay 29, 02:10 UTC15m
2026-05-28 JJA2504 BKK → ICN May 28, 18:25 UTCMay 28, 23:40 UTC5h 15m
2026-05-28 JJA2503 ICN → BKK May 28, 11:45 UTCMay 28, 16:45 UTC5h 0m
2026-05-28 JJA2503 ICN → BKK May 28, 11:35 UTCMay 28, 11:40 UTC5m
2026-05-28 JJA1802 OKA → ICN May 28, 04:55 UTCMay 28, 10:05 UTC5h 10m
2026-05-28 JJA1302 ICN → KIX May 28, 01:20 UTCMay 28, 02:40 UTC1h 20m
2026-05-27 JJA1301 KIX → ICN May 27, 22:30 UTCMay 27, 23:45 UTC1h 15m
2026-05-27 JJA2316 PQC → ICN May 27, 08:40 UTCMay 27, 20:35 UTC11h 55m
2026-05-27 JJA6102 TPE → ICN May 27, 04:24 UTCMay 27, 06:55 UTC2h 30m
2026-05-27 JJA6101 ICN → TPE May 27, 00:39 UTCMay 27, 02:49 UTC2h 10m
2026-05-26 JJA1308 KIX → ICN May 26, 11:00 UTCMay 26, 12:24 UTC1h 25m
2026-05-26 JJA1307 ICN → KIX May 26, 08:19 UTCMay 26, 09:45 UTC1h 25m
2026-05-26 JJA6102 TPE → ICN May 26, 04:04 UTCMay 26, 06:10 UTC2h 5m
2026-05-26 JJA6101 ICN → TPE May 26, 00:24 UTCMay 26, 02:35 UTC2h 10m
2026-05-25 JJA1108 NRT → ICN May 25, 10:05 UTCMay 25, 12:05 UTC2h 0m
2026-05-25 JJA1107 NRT → ICN May 25, 06:30 UTCMay 25, 08:20 UTC1h 50m
2026-05-25 JJA8502 WEH → ICN May 25, 04:35 UTCMay 25, 04:55 UTC20m
2026-05-24 JJA2504 BKK → ICN May 24, 18:35 UTCMay 24, 23:45 UTC5h 10m
2026-05-24 JJA2503 ICN → BKK May 24, 11:40 UTCMay 24, 17:00 UTC5h 20m
2026-05-24 JJA1802 OKA → ICN May 24, 04:35 UTCMay 24, 09:45 UTC5h 10m
2026-05-24 JJA1302 ICN → KIX May 24, 01:15 UTCMay 24, 02:40 UTC1h 25m
2026-05-23 JJA1301 KIX → ICN May 23, 22:25 UTCMay 23, 23:40 UTC1h 15m
2026-05-23 JJA2315 ICN → PQC May 23, 08:35 UTCMay 23, 20:25 UTC11h 51m
2026-05-23 JJA6102 TPE → ICN May 23, 05:10 UTCMay 23, 07:15 UTC2h 5m
2026-05-23 JJA6101 ICN → TPE May 23, 03:10 UTCMay 23, 03:35 UTC25m
2026-05-23 JJA6101 ICN → TPE May 23, 01:25 UTCMay 23, 01:50 UTC25m
2026-05-22 JJA1108 NRT → ICN May 22, 10:20 UTCMay 22, 12:15 UTC1h 55m
2026-05-22 JJA1107 NRT → ICN May 22, 06:40 UTCMay 22, 08:40 UTC2h 0m
2026-05-22 JJA8502 WEH → ICN May 22, 04:45 UTCMay 22, 05:10 UTC25m
2026-05-22 JJA8501 ICN → WEH May 22, 01:50 UTCMay 22, 02:05 UTC15m
2026-05-21 JJA2504 BKK → ICN May 21, 18:35 UTCMay 21, 23:45 UTC5h 10m
2026-05-21 JJA2503 ICN → BKK May 21, 11:40 UTCMay 21, 17:00 UTC5h 20m
2026-05-21 JJA1802 OKA → ICN May 21, 04:40 UTCMay 21, 09:55 UTC5h 15m
2026-05-21 JJA1302 ICN → KIX May 21, 01:20 UTCMay 21, 02:50 UTC1h 30m
2026-05-20 JJA1301 KIX → ICN May 20, 22:35 UTCMay 20, 23:55 UTC1h 20m
2026-05-20 JJA2316 PQC → ICN May 20, 08:45 UTCMay 20, 20:30 UTC11h 45m
2026-05-20 JJA6102 TPE → ICN May 20, 05:45 UTCMay 20, 06:20 UTC35m
2026-05-20 JJA6102 TPE → ICN May 20, 04:15 UTCMay 20, 04:35 UTC20m
2026-05-20 JJA6101 ICN → TPE May 20, 00:40 UTCMay 20, 02:50 UTC2h 10m
2026-05-20 - ICN → ICN May 20, 00:25 UTCMay 20, 00:30 UTC5m
2026-05-19 JJA1308 KIX → ICN May 19, 11:00 UTCMay 19, 12:20 UTC1h 20m
2026-05-19 JJA1307 ICN → KIX May 19, 08:15 UTCMay 19, 09:40 UTC1h 25m
2026-05-19 JJA6102 TPE → ICN May 19, 04:15 UTCMay 19, 06:20 UTC2h 5m
2026-05-19 JJA6101 ICN → TPE May 19, 00:20 UTCMay 19, 02:20 UTC2h 0m
2026-05-18 JJA1108 NRT → ICN May 18, 10:05 UTCMay 18, 12:00 UTC1h 55m
2026-05-18 JJA1107 NRT → ICN May 18, 06:35 UTCMay 18, 08:30 UTC1h 55m
2026-05-18 JJA8502 WEH → ICN May 18, 04:11 UTCMay 18, 04:45 UTC35m

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 HL8594 page for operator, model, and routing details .

Mode-S 71C594 frequently asked

What is Mode-S code 71C594?
71C594 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8594.
Where is Mode-S 71C594 registered?
Mode-S code 71C594 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 71C594 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C594, octal 34342624, decimal 7,456,148.
What flights does 71C594 operate?
Mode-S 71C594 has broadcast 20 distinct callsigns, including JJA1203, JJA6102, JJA6101, JJA1802, JJA1204.