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 Jul 26, 22:40 UTC
Flights observed
470
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 22:40 UTC

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
JJA6101 Jeju Air 31 2026-07-20
JJA6102 Jeju Air 30 2026-07-20
JJA1203 - 20 2026-06-29
JJA1802 - 15 2026-07-17
JJA1204 - 15 2026-06-29
JJA1404 - 14 2026-07-16
JJA1301 Jeju Air 14 2026-07-16
JJA1403 - 13 2026-07-16
JJA1302 - 13 2026-07-17
JJA8401 - 12 2026-07-12
JJA6013 - 12 2026-06-26
JJA1307 Jeju Air 12 2026-07-20
JJA1108 - 12 2026-07-16
JJA1107 - 12 2026-07-16
JJA1105 - 12 2026-07-13
JJA8402 - 11 2026-07-13
JJA2661 Jeju Air 11 2026-07-26
JJA1308 - 11 2026-07-20
JJA8502 - 10 2026-07-10
JJA2662 Jeju Air 10 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA2662 SIN → PUS Jul 26, 22:15 UTCJul 26, 22:30 UTC15m
2026-07-26 JJA2662 SIN → PUS Jul 26, 19:50 UTCJul 26, 20:55 UTC1h 5m
2026-07-26 JJA2662 SIN → PUS Jul 26, 16:40 UTCJul 26, 16:50 UTC10m
2026-07-26 JJA2661 PUS → SIN Jul 26, 10:05 UTCJul 26, 13:10 UTC3h 5m
2026-07-26 JJA2661 PUS → SIN Jul 26, 08:55 UTCJul 26, 09:15 UTC20m
2026-07-26 JJA1154 NRT → PUS Jul 26, 05:40 UTCJul 26, 07:30 UTC1h 51m
2026-07-26 JJA1153 NRT → PUS Jul 26, 02:10 UTCJul 26, 04:00 UTC1h 50m
2026-07-25 JJA2662 SIN → PUS Jul 25, 22:05 UTCJul 25, 22:30 UTC25m
2026-07-25 JJA2662 SIN → PUS Jul 25, 19:50 UTCJul 25, 20:55 UTC1h 5m
2026-07-25 JJA2662 SIN → PUS Jul 25, 16:45 UTCJul 25, 16:55 UTC10m
2026-07-25 JJA2661 PUS → SIN Jul 25, 09:05 UTCJul 25, 14:45 UTC5h 40m
2026-07-25 JJA1154 NRT → PUS Jul 25, 05:30 UTCJul 25, 07:10 UTC1h 40m
2026-07-25 JJA1153 NRT → PUS Jul 25, 02:10 UTCJul 25, 03:55 UTC1h 45m
2026-07-24 JJA2662 SIN → PUS Jul 24, 22:20 UTCJul 24, 22:40 UTC20m
2026-07-24 JJA2662 SIN → PUS Jul 24, 18:30 UTCJul 24, 21:40 UTC3h 10m
2026-07-24 JJA2661 PUS → SIN Jul 24, 14:40 UTCJul 24, 15:00 UTC20m
2026-07-24 JJA2661 PUS → SIN Jul 24, 10:45 UTCJul 24, 11:55 UTC1h 10m
2026-07-24 JJA2661 PUS → SIN Jul 24, 09:20 UTCJul 24, 09:35 UTC15m
2026-07-24 JJA1154 NRT → PUS Jul 24, 06:00 UTCJul 24, 07:45 UTC1h 45m
2026-07-24 JJA1103 NRT → ICN Jul 24, 01:55 UTCJul 24, 03:55 UTC2h 0m
2026-07-23 JJA2304 CXR → ICN Jul 23, 12:55 UTCJul 23, 23:20 UTC10h 25m
2026-07-23 JJA1616 HIJ → ICN Jul 23, 05:50 UTCJul 23, 07:00 UTC1h 10m
2026-07-23 JJA1615 ICN → HIJ Jul 23, 03:35 UTCJul 23, 04:40 UTC1h 5m
2026-07-23 JJA1396 KIX → ICN Jul 23, 00:10 UTCJul 23, 01:35 UTC1h 25m
2026-07-22 JJA1395 ICN → KIX Jul 22, 11:10 UTCJul 22, 12:20 UTC1h 10m
2026-07-22 JJA1103 NRT → ICN Jul 22, 01:50 UTCJul 22, 04:30 UTC2h 40m
2026-07-21 JJA2212 DAD → ICN Jul 21, 00:40 UTCJul 21, 10:50 UTC10h 10m
2026-07-20 JJA1308 KIX → ICN Jul 20, 11:05 UTCJul 20, 12:40 UTC1h 35m
2026-07-20 JJA1307 ICN → KIX Jul 20, 08:30 UTCJul 20, 09:55 UTC1h 25m
2026-07-20 JJA6102 TPE → ICN Jul 20, 04:15 UTCJul 20, 06:25 UTC2h 10m
2026-07-20 JJA6101 ICN → TPE Jul 20, 00:40 UTCJul 20, 03:00 UTC2h 20m
2026-07-19 JJA2516 - Jul 19, 16:00 UTCJul 19, 21:10 UTC5h 10m
2026-07-19 JJA2515 - Jul 19, 09:30 UTCJul 19, 14:10 UTC4h 40m
2026-07-19 JJA1104 NRT → ICN Jul 19, 05:20 UTCJul 19, 07:20 UTC2h 0m
2026-07-19 JJA1103 NRT → ICN Jul 19, 02:00 UTCJul 19, 04:00 UTC2h 0m
2026-07-18 JJA2114 ICN → ICN Jul 18, 12:20 UTCJul 18, 22:20 UTC10h 0m
2026-07-18 JJA2212 - Jul 18, 02:35 UTCJul 18, 10:50 UTC8h 16m
2026-07-18 JJA2211 - Jul 18, 00:50 UTCJul 18, 01:34 UTC45m
2026-07-17 JJA2114 ICN → ICN Jul 17, 12:15 UTCJul 17, 22:05 UTC9h 50m
2026-07-17 JJA1802 - Jul 17, 08:15 UTCJul 17, 10:00 UTC1h 45m
2026-07-17 JJA1801 - Jul 17, 04:49 UTCJul 17, 06:40 UTC1h 50m
2026-07-17 JJA1302 KIX → ICN Jul 17, 01:09 UTCJul 17, 02:30 UTC1h 20m
2026-07-16 JJA1301 KIX → ICN Jul 16, 22:25 UTCJul 16, 23:55 UTC1h 30m
2026-07-16 JJA1108 NRT → ICN Jul 16, 10:00 UTCJul 16, 11:50 UTC1h 50m
2026-07-16 JJA1107 ICN → NRT Jul 16, 06:20 UTCJul 16, 08:15 UTC1h 55m
2026-07-16 JJA1404 - Jul 16, 03:30 UTCJul 16, 04:30 UTC1h 0m
2026-07-16 JJA1403 - Jul 16, 01:10 UTCJul 16, 01:50 UTC40m
2026-07-15 JJA2108 - Jul 15, 18:15 UTCJul 15, 21:45 UTC3h 30m
2026-07-15 JJA2107 - Jul 15, 13:25 UTCJul 15, 16:50 UTC3h 25m
2026-07-15 JJA2212 ICN → ICN Jul 15, 00:35 UTCJul 15, 10:35 UTC10h 0m

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 Jul 26, 22:40 UTC.
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 JJA6101, JJA6102, JJA1203, JJA1802, JJA1204.