Apparatus

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sensors Mode-S transponder

71C304

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

Currently assigned to HL8304 · BOEING 737-800

Hex
71C304
Octal
34341404
Decimal
7,455,492
Country
KR
Tail
HL8304
Type
B738
No current signal · last broadcast Jul 26, 09:45 UTC
Flights observed
569
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 09:45 UTC

Last known position

Most recent position reported by Mode-S 71C304.

Country allocation

The ICAO 24-bit address 71C304 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
JJA1354 Jeju Air 14 2026-07-24
JJA6151 Jeju Air 13 2026-07-24
JJA1353 Jeju Air 13 2026-07-24
JJA141 - 12 2026-07-19
JJA132 - 12 2026-07-19
JJA6152 Jeju Air 10 2026-07-24
JJA5257 - 10 2026-07-09
JJA133 Jeju Air 10 2026-07-19
JJA124 Jeju Air 10 2026-07-19
JJA121 Jeju Air 10 2026-07-19
JJA112 Jeju Air 10 2026-07-19
JJA111 Jeju Air 9 2026-07-20
JJA102 Jeju Air 9 2026-07-19
JJA142 - 8 2026-07-14
JJA139 - 8 2026-07-14
JJA1352 Jeju Air 8 2026-07-23
JJA110 - 8 2026-07-15
JJA213 Jeju Air 7 2026-07-21
JJA1351 Jeju Air 7 2026-07-22
JJA130 - 7 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA706 CJU → TAE Jul 26, 09:20 UTCJul 26, 09:45 UTC25m
2026-07-26 JJA131 GMP → CJU Jul 26, 07:05 UTCJul 26, 07:40 UTC35m
2026-07-26 JJA122 CJU → GMP Jul 26, 05:15 UTCJul 26, 06:00 UTC45m
2026-07-26 JJA117 GMP → CJU Jul 26, 03:15 UTCJul 26, 03:50 UTC35m
2026-07-26 JJA108 CJU → GMP Jul 26, 01:35 UTCJul 26, 02:20 UTC45m
2026-07-25 JJA711 TAE → CJU Jul 25, 23:25 UTCJul 25, 23:45 UTC20m
2026-07-25 JJA706 CJU → TAE Jul 25, 09:25 UTCJul 25, 09:35 UTC10m
2026-07-25 JJA131 GMP → CJU Jul 25, 07:15 UTCJul 25, 07:45 UTC30m
2026-07-25 JJA120 CJU → GMP Jul 25, 05:20 UTCJul 25, 06:05 UTC45m
2026-07-25 JJA115 GMP → CJU Jul 25, 03:10 UTCJul 25, 03:45 UTC35m
2026-07-25 JJA106 CJU → GMP Jul 25, 01:20 UTCJul 25, 02:00 UTC40m
2026-07-24 JJA501 PUS → CJU Jul 24, 23:15 UTCJul 24, 23:30 UTC15m
2026-07-24 JJA8352 PVG → PUS Jul 24, 21:10 UTCJul 24, 21:40 UTC30m
2026-07-24 JJA8351 PUS → PVG Jul 24, 13:10 UTCJul 24, 13:25 UTC15m
2026-07-24 JJA1354 KIX → PUS Jul 24, 10:20 UTCJul 24, 11:35 UTC1h 15m
2026-07-24 JJA1353 PUS → KIX Jul 24, 07:55 UTCJul 24, 08:55 UTC1h 0m
2026-07-24 JJA6152 TPE → PUS Jul 24, 06:05 UTCJul 24, 06:40 UTC35m
2026-07-24 JJA6152 TPE → PUS Jul 24, 04:40 UTCJul 24, 04:55 UTC15m
2026-07-24 JJA6151 PUS → TPE Jul 24, 02:15 UTCJul 24, 02:35 UTC20m
2026-07-24 JJA6151 PUS → TPE Jul 24, 00:40 UTCJul 24, 01:00 UTC20m
2026-07-23 JJA2552 BKK → PUS Jul 23, 23:00 UTCJul 23, 23:25 UTC25m
2026-07-23 JJA2552 BKK → PUS Jul 23, 18:35 UTCJul 23, 22:00 UTC3h 25m
2026-07-23 JJA2551 PUS → BKK Jul 23, 11:50 UTCJul 23, 16:50 UTC5h 0m
2026-07-23 JJA1454 - Jul 23, 06:40 UTCJul 23, 07:10 UTC30m
2026-07-23 JJA1453 PUS → FUK Jul 23, 04:05 UTCJul 23, 04:50 UTC45m
2026-07-23 JJA1352 KIX → PUS Jul 23, 01:50 UTCJul 23, 03:00 UTC1h 10m
2026-07-22 JJA1351 PUS → KIX Jul 22, 23:35 UTCJul 23, 00:40 UTC1h 5m
2026-07-22 JJA8352 PVG → PUS Jul 22, 20:55 UTCJul 22, 21:35 UTC40m
2026-07-22 JJA8351 PUS → PVG Jul 22, 13:15 UTCJul 22, 13:35 UTC20m
2026-07-22 JJA6256 KHH → PUS Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 JJA1152 NRT → PUS Jul 22, 01:45 UTCJul 22, 03:25 UTC1h 40m
2026-07-21 JJA1151 PUS → NRT Jul 21, 22:45 UTCJul 22, 00:30 UTC1h 45m
2026-07-21 JJA514 CJU → PUS Jul 21, 11:35 UTCJul 21, 11:55 UTC20m
2026-07-21 JJA305 KWJ → CJU Jul 21, 09:25 UTCJul 21, 09:40 UTC15m
2026-07-21 JJA306 CJU → KWJ Jul 21, 08:20 UTCJul 21, 08:35 UTC15m
2026-07-21 JJA507 PUS → CJU Jul 21, 06:00 UTCJul 21, 06:10 UTC10m
2026-07-21 JJA506 CJU → PUS Jul 21, 04:40 UTCJul 21, 05:00 UTC20m
2026-07-21 JJA213 CJJ → CJU Jul 21, 02:40 UTCJul 21, 03:10 UTC30m
2026-07-21 JJA214 CJU → CJJ Jul 21, 00:55 UTCJul 21, 01:30 UTC35m
2026-07-20 JJA107 - Jul 20, 22:45 UTCJul 20, 23:15 UTC30m
2026-07-20 JJA186 CJU → GMP Jul 20, 11:50 UTCJul 20, 12:25 UTC35m
2026-07-20 JJA8136 - Jul 20, 03:30 UTCJul 20, 09:45 UTC6h 15m
2026-07-20 JJA111 GMP → CJU Jul 20, 00:35 UTCJul 20, 01:10 UTC35m
2026-07-19 JJA102 CJU → GMP Jul 19, 22:30 UTCJul 19, 23:20 UTC50m
2026-07-19 JJA141 - Jul 19, 11:40 UTCJul 19, 12:15 UTC35m
2026-07-19 JJA132 - Jul 19, 10:10 UTCJul 19, 10:45 UTC35m
2026-07-19 JJA133 GMP → CJU Jul 19, 08:10 UTCJul 19, 08:45 UTC35m
2026-07-19 JJA124 CJU → GMP Jul 19, 06:25 UTCJul 19, 07:05 UTC40m
2026-07-19 JJA121 GMP → CJU Jul 19, 04:15 UTCJul 19, 04:50 UTC35m
2026-07-19 JJA112 CJU → GMP Jul 19, 02:40 UTCJul 19, 03:20 UTC40m

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 HL8304 page for operator, model, and routing details .

Mode-S 71C304 frequently asked

What is Mode-S code 71C304?
71C304 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8304.
Where is Mode-S 71C304 registered?
Mode-S code 71C304 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 71C304 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 09:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C304, octal 34341404, decimal 7,455,492.
What flights does 71C304 operate?
Mode-S 71C304 has broadcast 20 distinct callsigns, including JJA1354, JJA6151, JJA1353, JJA141, JJA132.