Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Transponder active on ground
Flights observed
619
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 71C305.

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
JJA141 - 10 2026-07-12
JJA1408 Jeju Air 9 2026-06-11
JJA132 - 9 2026-07-11
JJA126 Jeju Air 9 2026-07-20
JJA1407 Jeju Air 8 2026-06-11
JJA135 - 8 2026-07-18
JJA125 - 8 2026-07-18
JJA154 Jeju Air 7 2026-07-22
JJA153 Jeju Air 7 2026-07-22
JJA152 Jeju Air 7 2026-07-21
JJA151 Jeju Air 7 2026-07-21
JJA134 - 7 2026-07-22
JJA133 - 7 2026-07-12
JJA1328 Jeju Air 7 2026-07-21
JJA1327 Jeju Air 7 2026-07-21
JJA1326 Jeju Air 7 2026-07-21
JJA1325 - 7 2026-07-20
JJA124 - 7 2026-07-12
JJA121 - 7 2026-07-12
JJA112 - 7 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA8352 PVG → PUS Jul 26, 21:05 UTCJul 26, 21:15 UTC10m
2026-07-26 JJA8351 PUS → PVG Jul 26, 12:55 UTCJul 26, 13:15 UTC20m
2026-07-26 JJA1354 KIX → PUS Jul 26, 10:15 UTCJul 26, 11:10 UTC55m
2026-07-26 JJA1353 PUS → KIX Jul 26, 07:30 UTCJul 26, 08:35 UTC1h 5m
2026-07-26 JJA6152 TPE → PUS Jul 26, 05:40 UTCJul 26, 06:00 UTC20m
2026-07-26 JJA6152 TPE → PUS Jul 26, 04:10 UTCJul 26, 04:30 UTC20m
2026-07-26 JJA6151 PUS → TPE Jul 26, 00:35 UTCJul 26, 02:35 UTC2h 0m
2026-07-25 JJA2552 BKK → PUS Jul 25, 18:15 UTCJul 25, 23:10 UTC4h 55m
2026-07-25 JJA2551 PUS → BKK Jul 25, 11:35 UTCJul 25, 16:40 UTC5h 5m
2026-07-25 JJA8254 DYG → PUS Jul 25, 08:50 UTCJul 25, 09:10 UTC20m
2026-07-25 JJA8253 PUS → DYG Jul 25, 02:10 UTCJul 25, 02:30 UTC20m
2026-07-25 JJA1452 FUK → PUS Jul 25, 00:05 UTCJul 25, 00:30 UTC25m
2026-07-24 JJA1451 PUS → FUK Jul 24, 22:10 UTCJul 24, 22:25 UTC15m
2026-07-24 JJA514 CJU → PUS Jul 24, 11:30 UTCJul 24, 11:50 UTC20m
2026-07-24 JJA305 KWJ → CJU Jul 24, 09:40 UTCJul 24, 09:50 UTC10m
2026-07-24 JJA306 CJU → KWJ Jul 24, 08:30 UTCJul 24, 08:40 UTC10m
2026-07-24 JJA507 PUS → CJU Jul 24, 06:35 UTCJul 24, 06:50 UTC15m
2026-07-24 JJA506 CJU → PUS Jul 24, 05:15 UTCJul 24, 05:35 UTC20m
2026-07-24 JJA213 CJJ → CJU Jul 24, 03:05 UTCJul 24, 03:35 UTC30m
2026-07-24 JJA214 CJU → CJJ Jul 24, 01:20 UTCJul 24, 02:05 UTC45m
2026-07-23 JJA107 GMP → CJU Jul 23, 22:50 UTCJul 23, 23:25 UTC35m
2026-07-23 JJA158 CJU → GMP Jul 23, 11:30 UTCJul 23, 12:10 UTC40m
2026-07-23 JJA157 GMP → CJU Jul 23, 09:30 UTCJul 23, 10:05 UTC35m
2026-07-23 JJA156 CJU → GMP Jul 23, 07:50 UTCJul 23, 08:35 UTC45m
2026-07-23 JJA155 GMP → CJU Jul 23, 05:30 UTCJul 23, 06:00 UTC30m
2026-07-23 JJA116 CJU → GMP Jul 23, 03:20 UTCJul 23, 04:05 UTC45m
2026-07-23 JJA211 PUS → GMP Jul 23, 01:05 UTCJul 23, 01:35 UTC30m
2026-07-22 JJA212 CJU → CJJ Jul 22, 23:30 UTCJul 23, 00:05 UTC35m
2026-07-22 JJA101 GMP → CJU Jul 22, 21:30 UTCJul 22, 22:05 UTC35m
2026-07-22 JJA134 - Jul 22, 11:35 UTCJul 22, 12:20 UTC45m
2026-07-22 JJA154 CJU → GMP Jul 22, 03:45 UTCJul 22, 04:25 UTC40m
2026-07-22 JJA153 GMP → CJU Jul 22, 01:40 UTCJul 22, 02:25 UTC45m
2026-07-21 JJA152 CJU → GMP Jul 21, 23:50 UTCJul 22, 00:35 UTC45m
2026-07-21 JJA151 GMP → CJU Jul 21, 21:40 UTCJul 21, 22:15 UTC35m
2026-07-21 JJA142 CJU → GMP Jul 21, 13:00 UTCJul 21, 13:40 UTC40m
2026-07-21 JJA139 GMP → CJU Jul 21, 10:45 UTCJul 21, 11:20 UTC35m
2026-07-21 JJA1328 KIX → GMP Jul 21, 08:05 UTCJul 21, 09:25 UTC1h 20m
2026-07-21 JJA1327 GMP → KIX Jul 21, 05:20 UTCJul 21, 06:45 UTC1h 25m
2026-07-21 JJA1326 KIX → GMP Jul 21, 02:05 UTCJul 21, 03:25 UTC1h 20m
2026-07-20 JJA1325 GMP → KIX Jul 20, 23:20 UTCJul 21, 00:45 UTC1h 24m
2026-07-20 JJA094F ICN → GMP Jul 20, 21:25 UTCJul 20, 21:40 UTC15m
2026-07-20 JJA142 CJU → GMP Jul 20, 13:30 UTCJul 20, 14:05 UTC35m
2026-07-20 JJA139 GMP → CJU Jul 20, 11:25 UTCJul 20, 12:05 UTC40m
2026-07-20 JJA126 CJU → GMP Jul 20, 09:50 UTCJul 20, 10:30 UTC40m
2026-07-20 JJA129 GMP → CJU Jul 20, 07:30 UTCJul 20, 08:05 UTC35m
2026-07-20 JJA122 CJU → GMP Jul 20, 05:35 UTCJul 20, 06:15 UTC40m
2026-07-20 JJA117 GMP → CJU Jul 20, 03:30 UTCJul 20, 04:05 UTC35m
2026-07-20 JJA108 CJU → GMP Jul 20, 02:00 UTCJul 20, 02:30 UTC30m
2026-07-19 JJA711 TAE → CJU Jul 19, 23:20 UTCJul 19, 23:35 UTC15m
2026-07-19 JJA706 - Jul 19, 09:15 UTCJul 19, 09:40 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 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?
Mode-S 71C305 is currently broadcasting from the ground.
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 JJA141, JJA1408, JJA132, JJA126, JJA1407.