Apparatus

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sensors Mode-S transponder

71C539

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

Currently assigned to HL8539 · BOEING 737-800

Hex
71C539
Octal
34342471
Decimal
7,456,057
Country
KR
Tail
HL8539
Type
B738
No current signal · last broadcast 2h ago
Flights observed
223
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C539.

Country allocation

The ICAO 24-bit address 71C539 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
JJA1101 Jeju Air 9 2026-05-22
JJA1616 Jeju Air 7 2026-05-22
JJA1615 Jeju Air 7 2026-05-22
JJA1504 Jeju Air 7 2026-05-18
JJA1503 Jeju Air 7 2026-05-18
JJA1408 Jeju Air 7 2026-05-20
JJA1407 Jeju Air 7 2026-05-20
JJA1402 Jeju Air 7 2026-05-20
JJA1401 Jeju Air 7 2026-05-19
JJA2126 - 6 2026-05-14
JJA1102 Jeju Air 6 2026-05-23
JJA2315 Jeju Air 5 2026-05-05
JJA2125 - 5 2026-04-17
JJA1702 Jeju Air 5 2026-05-18
JJA1603 Jeju Air 5 2026-05-09
JJA8488 - 4 2026-04-18
JJA1701 Jeju Air 4 2026-05-17
JJA1611 Jeju Air 4 2026-04-28
JJA1604 Jeju Air 4 2026-05-09
JJA8905 Jeju Air 3 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 JJA108 CJU → GMP May 30, 01:40 UTCMay 30, 02:15 UTC35m
2026-05-29 JJA131 GMP → CJU May 29, 07:10 UTCMay 29, 07:35 UTC25m
2026-05-29 JJA114 CJU → GMP May 29, 03:20 UTCMay 29, 03:50 UTC30m
2026-05-28 JJA103 GMP → CJU May 28, 21:50 UTCMay 28, 22:15 UTC25m
2026-05-28 JJA142 CJU → GMP May 28, 13:05 UTCMay 28, 13:30 UTC25m
2026-05-28 JJA139 GMP → CJU May 28, 10:45 UTCMay 28, 11:10 UTC25m
2026-05-28 JJA1328 KIX → GMP May 28, 07:45 UTCMay 28, 09:05 UTC1h 20m
2026-05-28 JJA1327 GMP → KIX May 28, 05:05 UTCMay 28, 06:25 UTC1h 20m
2026-05-28 JJA1326 KIX → GMP May 28, 02:10 UTCMay 28, 03:30 UTC1h 20m
2026-05-27 JJA1325 GMP → KIX May 27, 23:20 UTCMay 28, 00:40 UTC1h 20m
2026-05-27 JJA186 CJU → GMP May 27, 10:35 UTCMay 27, 11:00 UTC25m
2026-05-27 JJA8135 CJU → PKX May 27, 03:45 UTCMay 27, 08:00 UTC4h 15m
2026-05-27 JJA109 GMP → CJU May 27, 00:14 UTCMay 27, 00:39 UTC25m
2026-05-26 JJA138 CJU → GMP May 26, 12:54 UTCMay 26, 13:34 UTC40m
2026-05-26 JJA227 CJJ → CJU May 26, 10:39 UTCMay 26, 11:00 UTC20m
2026-05-26 JJA228 CJU → CJJ May 26, 09:15 UTCMay 26, 09:40 UTC25m
2026-05-26 JJA109 GMP → CJU May 26, 00:09 UTCMay 26, 00:35 UTC25m
2026-05-25 JJA142 CJU → GMP May 25, 13:30 UTCMay 25, 13:55 UTC25m
2026-05-25 JJA139 GMP → CJU May 25, 10:55 UTCMay 25, 11:20 UTC25m
2026-05-25 JJA128 CJU → GMP May 25, 09:30 UTCMay 25, 10:00 UTC30m
2026-05-25 JJA129 GMP → CJU May 25, 07:15 UTCMay 25, 07:40 UTC25m
2026-05-25 JJA120 CJU → GMP May 25, 05:30 UTCMay 25, 06:10 UTC40m
2026-05-25 JJA115 GMP → CJU May 25, 03:10 UTCMay 25, 03:35 UTC25m
2026-05-25 JJA106 CJU → GMP May 25, 01:55 UTCMay 25, 02:10 UTC15m
2026-05-24 JJA213 CJJ → CJU May 24, 02:40 UTCMay 24, 03:00 UTC20m
2026-05-24 JJA214 CJU → CJJ May 24, 01:15 UTCMay 24, 01:40 UTC25m
2026-05-23 JJA107 GMP → CJU May 23, 22:45 UTCMay 23, 23:10 UTC25m
2026-05-23 JJA158 CJU → GMP May 23, 11:50 UTCMay 23, 12:25 UTC35m
2026-05-23 JJA167 ICN → CJU May 23, 09:30 UTCMay 23, 09:55 UTC25m
2026-05-23 JJA1102 ICN → NRT May 23, 03:00 UTCMay 23, 05:10 UTC2h 10m
2026-05-22 JJA1101 NRT → ICN May 22, 23:25 UTCMay 23, 01:20 UTC1h 55m
2026-05-22 JJA1616 HIJ → ICN May 22, 05:50 UTCMay 22, 07:05 UTC1h 15m
2026-05-22 JJA1615 ICN → HIJ May 22, 03:15 UTCMay 22, 04:20 UTC1h 5m
2026-05-22 JJA1396 KIX → ICN May 22, 00:10 UTCMay 22, 01:45 UTC1h 35m
2026-05-21 JJA1395 ICN → KIX May 21, 10:35 UTCMay 21, 11:55 UTC1h 20m
2026-05-21 JJA1176 NRT → ICN May 21, 04:45 UTCMay 21, 07:00 UTC2h 15m
2026-05-21 JJA1175 NRT → PUS May 21, 01:05 UTCMay 21, 03:05 UTC2h 0m
2026-05-20 JJA1408 FUK → ICN May 20, 11:20 UTCMay 20, 12:20 UTC1h 0m
2026-05-20 JJA1407 ICN → FUK May 20, 08:30 UTCMay 20, 09:00 UTC30m
2026-05-20 JJA1472 FUK → ICN May 20, 05:05 UTCMay 20, 06:10 UTC1h 5m
2026-05-20 JJA1471 ICN → FUK May 20, 02:50 UTCMay 20, 03:20 UTC30m
2026-05-20 JJA1402 FUK → ICN May 20, 00:05 UTCMay 20, 01:10 UTC1h 5m
2026-05-19 JJA1401 ICN → FUK May 19, 21:45 UTCMay 19, 22:15 UTC30m
2026-05-19 JJA1471 ICN → FUK May 19, 02:55 UTCMay 19, 06:25 UTC3h 30m
2026-05-19 JJA1402 FUK → ICN May 19, 00:10 UTCMay 19, 01:10 UTC1h 0m
2026-05-18 JJA1401 ICN → FUK May 18, 21:45 UTCMay 18, 22:15 UTC30m
2026-05-18 JJA1504 CTS → ICN May 18, 07:05 UTCMay 18, 09:35 UTC2h 30m
2026-05-18 JJA1503 ICN → CTS May 18, 03:25 UTCMay 18, 05:50 UTC2h 25m
2026-05-18 JJA1702 MYJ → ICN May 18, 00:35 UTCMay 18, 01:45 UTC1h 10m
2026-05-17 JJA1701 ICN → MYJ May 17, 22:10 UTCMay 17, 23:10 UTC1h 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 HL8539 page for operator, model, and routing details .

Mode-S 71C539 frequently asked

What is Mode-S code 71C539?
71C539 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8539.
Where is Mode-S 71C539 registered?
Mode-S code 71C539 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 71C539 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C539, octal 34342471, decimal 7,456,057.
What flights does 71C539 operate?
Mode-S 71C539 has broadcast 20 distinct callsigns, including JJA1101, JJA1616, JJA1615, JJA1504, JJA1503.