Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 3h ago
Flights observed
229
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

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 6 2026-05-27
JJA6151 Jeju Air 5 2026-05-27
JJA141 Jeju Air 5 2026-05-11
JJA1353 Jeju Air 5 2026-05-27
JJA1352 Jeju Air 5 2026-05-18
JJA132 Jeju Air 5 2026-05-11
JJA5257 Jeju Air 4 2026-05-28
JJA212 Jeju Air 4 2026-05-19
JJA211 Jeju Air 4 2026-05-20
JJA158 Jeju Air 4 2026-05-20
JJA157 Jeju Air 4 2026-05-20
JJA156 Jeju Air 4 2026-05-20
JJA155 Jeju Air 4 2026-05-20
JJA1351 Jeju Air 4 2026-05-17
JJA133 Jeju Air 4 2026-05-11
JJA124 Jeju Air 4 2026-05-11
JJA123 Jeju Air 4 2026-05-26
JJA121 Jeju Air 4 2026-05-11
JJA116 Jeju Air 4 2026-05-20
JJA112 Jeju Air 4 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 JJA110 CJU → GMP May 30, 02:00 UTCMay 30, 02:40 UTC40m
2026-05-29 JJA6256 KHH → PUS May 29, 09:05 UTCMay 29, 09:50 UTC45m
2026-05-29 JJA1152 NRT → PUS May 29, 01:40 UTCMay 29, 07:55 UTC6h 15m
2026-05-28 JJA1151 PUS → NRT May 28, 22:55 UTCMay 29, 00:10 UTC1h 15m
2026-05-28 JJA5257 PUS → UBN May 28, 12:45 UTCMay 28, 20:25 UTC7h 40m
2026-05-28 JJA6256 KHH → PUS May 28, 09:05 UTCMay 28, 09:45 UTC40m
2026-05-28 JJA1152 NRT → PUS May 28, 01:50 UTCMay 28, 07:40 UTC5h 50m
2026-05-27 JJA1151 PUS → NRT May 27, 22:50 UTCMay 28, 00:05 UTC1h 15m
2026-05-27 JJA5257 PUS → UBN May 27, 12:55 UTCMay 27, 20:10 UTC7h 15m
2026-05-27 JJA1354 KIX → PUS May 27, 10:10 UTCMay 27, 10:40 UTC30m
2026-05-27 JJA1353 PUS → KIX May 27, 04:24 UTCMay 27, 08:30 UTC4h 5m
2026-05-27 JJA6151 PUS → TPE May 27, 02:19 UTCMay 27, 02:54 UTC35m
2026-05-26 JJA123 GMP → CJU May 26, 04:35 UTCMay 26, 05:00 UTC25m
2026-05-26 JJA110 CJU → GMP May 26, 02:15 UTCMay 26, 02:39 UTC25m
2026-05-25 JJA213 CJJ → CJU May 25, 02:35 UTCMay 25, 02:55 UTC20m
2026-05-24 JJA186 CJU → GMP May 24, 10:30 UTCMay 24, 11:00 UTC30m
2026-05-24 JJA8135 CJU → PKX May 24, 03:30 UTCMay 24, 07:55 UTC4h 25m
2026-05-24 JJA109 GMP → CJU May 24, 00:10 UTCMay 24, 00:30 UTC20m
2026-05-23 JJA142 CJU → GMP May 23, 13:00 UTCMay 23, 13:25 UTC25m
2026-05-23 JJA139 GMP → CJU May 23, 10:45 UTCMay 23, 11:10 UTC25m
2026-05-23 JJA128 CJU → GMP May 23, 09:10 UTCMay 23, 09:35 UTC25m
2026-05-23 JJA129 GMP → CJU May 23, 06:50 UTCMay 23, 07:15 UTC25m
2026-05-23 JJA118 CJU → GMP May 23, 04:10 UTCMay 23, 04:45 UTC35m
2026-05-23 JJA113 GMP → CJU May 23, 01:55 UTCMay 23, 02:20 UTC25m
2026-05-23 JJA104 CJU → GMP May 23, 00:15 UTCMay 23, 00:50 UTC35m
2026-05-22 JJA105 GMP → CJU May 22, 22:05 UTCMay 22, 22:35 UTC30m
2026-05-22 JJA122 CJU → GMP May 22, 05:55 UTCMay 22, 06:30 UTC35m
2026-05-22 JJA117 GMP → CJU May 22, 03:35 UTCMay 22, 04:00 UTC25m
2026-05-22 JJA108 CJU → GMP May 22, 01:55 UTCMay 22, 02:35 UTC40m
2026-05-21 JJA8632 KWL → TAE May 21, 22:25 UTCMay 21, 22:35 UTC10m
2026-05-21 JJA971F - May 21, 14:00 UTCMay 21, 14:10 UTC10m
2026-05-21 JJA907 GMP → PUS May 21, 11:10 UTCMay 21, 11:40 UTC30m
2026-05-21 JJA1328 KIX → GMP May 21, 07:45 UTCMay 21, 09:10 UTC1h 25m
2026-05-21 JJA1327 GMP → KIX May 21, 05:05 UTCMay 21, 06:30 UTC1h 25m
2026-05-21 JJA1326 KIX → GMP May 21, 02:10 UTCMay 21, 03:40 UTC1h 30m
2026-05-20 JJA1325 GMP → KIX May 20, 23:35 UTCMay 21, 01:10 UTC1h 35m
2026-05-20 JJA158 CJU → GMP May 20, 12:05 UTCMay 20, 12:45 UTC40m
2026-05-20 JJA157 GMP → CJU May 20, 09:50 UTCMay 20, 10:15 UTC25m
2026-05-20 JJA156 CJU → GMP May 20, 07:50 UTCMay 20, 08:25 UTC35m
2026-05-20 JJA155 GMP → CJU May 20, 05:30 UTCMay 20, 05:55 UTC25m
2026-05-20 JJA116 CJU → GMP May 20, 03:30 UTCMay 20, 04:20 UTC50m
2026-05-20 JJA211 PUS → GMP May 20, 01:15 UTCMay 20, 01:35 UTC20m
2026-05-19 JJA212 CJU → CJJ May 19, 23:35 UTCMay 20, 00:05 UTC30m
2026-05-19 JJA101 GMP → CJU May 19, 21:30 UTCMay 19, 21:55 UTC25m
2026-05-19 JJA142 CJU → GMP May 19, 13:05 UTCMay 19, 13:30 UTC25m
2026-05-19 JJA139 GMP → CJU May 19, 10:45 UTCMay 19, 11:10 UTC25m
2026-05-19 JJA128 CJU → GMP May 19, 09:20 UTCMay 19, 09:50 UTC30m
2026-05-19 JJA129 GMP → CJU May 19, 07:10 UTCMay 19, 07:35 UTC25m
2026-05-19 JJA122 CJU → GMP May 19, 05:30 UTCMay 19, 05:55 UTC25m
2026-05-19 JJA115 GMP → CJU May 19, 03:20 UTCMay 19, 03:45 UTC25m

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 3h ago.
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, JJA141, JJA1353, JJA1352.