Apparatus

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sensors Mode-S transponder

71C305

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

Currently assigned to HL8305 · BOEING 737-800

Hex
71C305
Octal
34341405
Decimal
7,455,493
Country
KR
Tail
HL8305
Type
B738
Broadcasting now · callsign JJA106 · 23,000 ft
Flights observed
237
Distinct callsigns
20
Country
KR
Last broadcast
5h ago

Current position

71C305 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C305 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
JJA1408 Jeju Air 8 2026-05-14
JJA1407 Jeju Air 7 2026-05-14
JJA6013 Jeju Air 6 2026-04-24
JJA2604 Jeju Air 5 2026-05-03
JJA2603 Jeju Air 5 2026-05-03
JJA1704 Jeju Air 5 2026-05-15
JJA1503 Jeju Air 5 2026-04-28
JJA1175 Jeju Air 5 2026-05-16
JJA1102 Jeju Air 5 2026-05-10
JJA1101 Jeju Air 5 2026-05-09
JJA8503 Jeju Air 4 2026-05-10
JJA6014 Jeju Air 4 2026-04-24
JJA1703 Jeju Air 4 2026-05-15
JJA1602 Jeju Air 4 2026-05-15
JJA1504 Jeju Air 4 2026-04-28
JJA1402 Jeju Air 4 2026-05-11
JJA1401 Jeju Air 4 2026-05-10
JJA1275 - 4 2026-05-07
JJA1176 Jeju Air 4 2026-05-16
JJA1172 Jeju Air 4 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JJA6154 TPE → PUS May 29, 19:20 UTCMay 29, 19:40 UTC20m
2026-05-29 JJA1354 KIX → PUS May 29, 10:20 UTCMay 29, 15:35 UTC5h 15m
2026-05-29 JJA1353 PUS → KIX May 29, 04:50 UTCMay 29, 08:40 UTC3h 50m
2026-05-28 JJA2552 BKK → PUS May 28, 18:10 UTCMay 29, 02:40 UTC8h 30m
2026-05-28 JJA2551 PUS → BKK May 28, 12:55 UTCMay 28, 16:30 UTC3h 35m
2026-05-28 JJA1453 PUS → FUK May 28, 04:40 UTCMay 28, 04:50 UTC10m
2026-05-28 JJA1352 KIX → PUS May 28, 01:45 UTCMay 28, 02:20 UTC35m
2026-05-27 JJA1162 NRT → PUS May 27, 06:55 UTCMay 28, 00:25 UTC17h 30m
2026-05-27 JJA1161 PUS → NRT May 27, 03:59 UTCMay 27, 05:19 UTC1h 20m
2026-05-26 JJA213 CJJ → CJU May 26, 02:44 UTCMay 26, 03:00 UTC15m
2026-05-26 JJA214 CJU → CJJ May 26, 01:20 UTCMay 26, 01:40 UTC20m
2026-05-25 JJA107 GMP → CJU May 25, 22:44 UTCMay 25, 23:10 UTC25m
2026-05-25 JJA1328 KIX → GMP May 25, 07:45 UTCMay 25, 09:05 UTC1h 20m
2026-05-25 JJA1327 GMP → KIX May 25, 05:00 UTCMay 25, 06:25 UTC1h 25m
2026-05-25 JJA1326 KIX → GMP May 25, 02:15 UTCMay 25, 03:35 UTC1h 20m
2026-05-24 JJA1325 GMP → KIX May 24, 23:20 UTCMay 24, 23:46 UTC26m
2026-05-24 JJA134 CJU → GMP May 24, 11:40 UTCMay 24, 12:10 UTC30m
2026-05-24 JJA135 GMP → CJU May 24, 09:30 UTCMay 24, 09:55 UTC25m
2026-05-24 JJA126 CJU → GMP May 24, 08:00 UTCMay 24, 08:35 UTC35m
2026-05-24 JJA125 GMP → CJU May 24, 05:40 UTCMay 24, 06:05 UTC25m
2026-05-24 JJA110 CJU → GMP May 24, 02:05 UTCMay 24, 02:40 UTC35m
2026-05-23 JJA1372 KIX → PUS May 23, 11:10 UTCMay 23, 11:50 UTC40m
2026-05-23 JJA1352 KIX → PUS May 23, 01:40 UTCMay 23, 09:40 UTC7h 59m
2026-05-22 JJA1351 PUS → KIX May 22, 23:50 UTCMay 23, 00:25 UTC35m
2026-05-22 JJA123 GMP → CJU May 22, 04:30 UTCMay 22, 04:55 UTC25m
2026-05-22 JJA110 CJU → GMP May 22, 02:35 UTCMay 22, 03:10 UTC35m
2026-05-21 JJA2552 BKK → PUS May 21, 18:10 UTCMay 21, 21:30 UTC3h 20m
2026-05-21 JJA2551 PUS → BKK May 21, 12:40 UTCMay 21, 16:05 UTC3h 25m
2026-05-20 JJA5257 PUS → UBN May 20, 12:50 UTCMay 20, 20:25 UTC7h 35m
2026-05-20 JJA1354 KIX → PUS May 20, 10:10 UTCMay 20, 10:45 UTC35m
2026-05-20 JJA1353 PUS → KIX May 20, 04:25 UTCMay 20, 08:30 UTC4h 6m
2026-05-19 JJA6154 TPE → PUS May 19, 18:50 UTCMay 20, 02:35 UTC7h 45m
2026-05-19 JJA6153 PUS → TPE May 19, 15:15 UTCMay 19, 15:35 UTC20m
2026-05-19 JJA1354 KIX → PUS May 19, 10:35 UTCMay 19, 11:05 UTC30m
2026-05-19 JJA1353 PUS → KIX May 19, 08:25 UTCMay 19, 09:15 UTC50m
2026-05-19 JJA8851 PUS → SJW May 19, 01:10 UTCMay 19, 06:20 UTC5h 10m
2026-05-18 JJA8134 - May 18, 18:50 UTCMay 18, 20:15 UTC1h 25m
2026-05-18 JJA8133 - May 18, 14:25 UTCMay 18, 14:55 UTC30m
2026-05-18 JJA141 GMP → CJU May 18, 11:55 UTCMay 18, 12:20 UTC25m
2026-05-18 JJA132 CJU → GMP May 18, 10:25 UTCMay 18, 10:55 UTC30m
2026-05-18 JJA133 GMP → CJU May 18, 08:10 UTCMay 18, 08:35 UTC25m
2026-05-18 JJA124 CJU → GMP May 18, 06:45 UTCMay 18, 07:15 UTC30m
2026-05-18 JJA121 GMP → CJU May 18, 04:40 UTCMay 18, 05:00 UTC20m
2026-05-18 JJA112 CJU → GMP May 18, 03:01 UTCMay 18, 03:30 UTC30m
2026-05-18 JJA111 GMP → CJU May 18, 00:35 UTCMay 18, 01:00 UTC25m
2026-05-17 JJA134 CJU → GMP May 17, 11:40 UTCMay 17, 12:10 UTC30m
2026-05-17 JJA135 GMP → CJU May 17, 09:25 UTCMay 17, 09:50 UTC25m
2026-05-17 JJA126 CJU → GMP May 17, 07:45 UTCMay 17, 08:15 UTC30m
2026-05-17 JJA125 GMP → CJU May 17, 05:35 UTCMay 17, 06:00 UTC25m
2026-05-17 JJA154 CJU → GMP May 17, 03:55 UTCMay 17, 04:25 UTC30m

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 HL8305 page for operator, model, and routing details .

Mode-S 71C305 frequently asked

What is Mode-S code 71C305?
71C305 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8305.
Where is Mode-S 71C305 registered?
Mode-S code 71C305 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 71C305 broadcasting right now?
Yes. Mode-S 71C305 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C305, octal 34341405, decimal 7,455,493.
What flights does 71C305 operate?
Mode-S 71C305 has broadcast 20 distinct callsigns, including JJA1408, JJA1407, JJA6013, JJA2604, JJA2603.