Apparatus

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sensors Mode-S transponder

71C739

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

Hex
71C739
Octal
34343471
Decimal
7,456,569
Country
KR
No current signal · last broadcast 11d ago
Flights observed
393
Distinct callsigns
20
Country
KR
Last broadcast
11d ago

Last known position

Most recent position reported by Mode-S 71C739.

Country allocation

The ICAO 24-bit address 71C739 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
JJA154 - 18 2026-06-15
JJA151 - 18 2026-06-14
JJA153 - 17 2026-06-15
JJA152 - 17 2026-06-14
JJA155 - 16 2026-06-19
JJA158 - 15 2026-06-18
JJA157 - 12 2026-06-18
JJA156 - 12 2026-06-18
JJA2661 Jeju Air 10 2026-07-23
JJA134 Jeju Air 9 2026-06-10
JJA212 - 8 2026-06-18
JJA211 - 8 2026-06-19
JJA135 Jeju Air 8 2026-06-10
JJA126 Jeju Air 8 2026-06-10
JJA125 Jeju Air 8 2026-06-10
JJA116 - 8 2026-06-19
JJA101 Jeju Air 8 2026-06-18
JJA2662 Jeju Air 7 2026-07-23
JJA8502 - 6 2026-07-18
JJA8501 - 6 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA2504 BKK → ICN Jul 26, 18:50 UTCJul 26, 22:15 UTC3h 25m
2026-07-26 JJA2503 ICN → BKK Jul 26, 11:40 UTCJul 26, 16:45 UTC5h 5m
2026-07-26 JJA1802 OKA → ICN Jul 26, 08:55 UTCJul 26, 09:35 UTC40m
2026-07-26 JJA1802 OKA → ICN Jul 26, 07:50 UTCJul 26, 08:05 UTC15m
2026-07-26 JJA1801 ICN → OKA Jul 26, 04:35 UTCJul 26, 06:15 UTC1h 40m
2026-07-26 JJA1302 ICN → KIX Jul 26, 01:15 UTCJul 26, 02:35 UTC1h 20m
2026-07-25 JJA1301 KIX → ICN Jul 25, 22:25 UTCJul 25, 23:40 UTC1h 15m
2026-07-25 JJA1204 NGO → ICN Jul 25, 09:30 UTCJul 25, 11:00 UTC1h 30m
2026-07-25 JJA1203 ICN → NGO Jul 25, 06:40 UTCJul 25, 08:05 UTC1h 25m
2026-07-25 JJA1404 FUK → ICN Jul 25, 03:35 UTCJul 25, 04:40 UTC1h 5m
2026-07-25 JJA1403 ICN → FUK Jul 25, 01:15 UTCJul 25, 02:10 UTC55m
2026-07-24 JJA2516 CNX → ICN Jul 24, 16:25 UTCJul 24, 21:35 UTC5h 10m
2026-07-24 JJA2515 ICN → CNX Jul 24, 14:15 UTCJul 24, 14:25 UTC10m
2026-07-24 JJA2515 ICN → CNX Jul 24, 09:35 UTCJul 24, 13:25 UTC3h 50m
2026-07-24 JJA1104 NRT → ICN Jul 24, 05:55 UTCJul 24, 07:55 UTC2h 0m
2026-07-24 JJA1153 NRT → PUS Jul 24, 02:15 UTCJul 24, 04:05 UTC1h 50m
2026-07-23 JJA2662 SIN → PUS Jul 23, 19:55 UTCJul 23, 22:45 UTC2h 50m
2026-07-23 JJA2662 SIN → PUS Jul 23, 16:50 UTCJul 23, 17:00 UTC10m
2026-07-23 JJA2661 PUS → SIN Jul 23, 14:15 UTCJul 23, 14:40 UTC25m
2026-07-23 JJA2661 PUS → SIN Jul 23, 10:25 UTCJul 23, 11:35 UTC1h 10m
2026-07-23 JJA2661 PUS → SIN Jul 23, 08:55 UTCJul 23, 09:10 UTC15m
2026-07-23 JJA1154 NRT → PUS Jul 23, 05:30 UTCJul 23, 07:15 UTC1h 45m
2026-07-23 JJA1153 NRT → PUS Jul 23, 02:10 UTCJul 23, 03:55 UTC1h 45m
2026-07-22 JJA2662 SIN → PUS Jul 22, 19:45 UTCJul 22, 22:20 UTC2h 35m
2026-07-22 JJA2661 PUS → SIN Jul 22, 14:05 UTCJul 22, 14:25 UTC20m
2026-07-22 JJA2661 PUS → SIN Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-22 JJA1153 NRT → PUS Jul 22, 02:05 UTCJul 22, 03:45 UTC1h 40m
2026-07-21 JJA2662 SIN → PUS Jul 21, 22:15 UTCJul 21, 22:40 UTC25m
2026-07-21 JJA2662 SIN → PUS Jul 21, 19:55 UTCJul 21, 21:05 UTC1h 10m
2026-07-21 JJA2661 PUS → SIN Jul 21, 14:00 UTCJul 21, 14:20 UTC20m
2026-07-21 JJA2661 PUS → SIN Jul 21, 10:20 UTCJul 21, 11:20 UTC1h 0m
2026-07-21 JJA2661 PUS → SIN Jul 21, 08:50 UTCJul 21, 09:10 UTC20m
2026-07-21 JJA1154 NRT → PUS Jul 21, 05:55 UTCJul 21, 07:35 UTC1h 40m
2026-07-21 JJA1153 NRT → PUS Jul 21, 02:20 UTCJul 21, 04:05 UTC1h 45m
2026-07-20 JJA2662 SIN → PUS Jul 20, 22:05 UTCJul 20, 22:25 UTC20m
2026-07-20 JJA2662 SIN → PUS Jul 20, 19:55 UTCJul 20, 20:55 UTC1h 0m
2026-07-20 JJA2661 PUS → SIN Jul 20, 14:15 UTCJul 20, 14:40 UTC25m
2026-07-20 JJA2661 PUS → SIN Jul 20, 09:00 UTCJul 20, 11:35 UTC2h 35m
2026-07-20 JJA1154 NRT → PUS Jul 20, 05:40 UTCJul 20, 07:25 UTC1h 45m
2026-07-20 JJA1103 NRT → ICN Jul 20, 01:55 UTCJul 20, 03:55 UTC2h 0m
2026-07-19 JJA2504 - Jul 19, 21:10 UTCJul 20, 00:10 UTC3h 0m
2026-07-19 JJA2504 - Jul 19, 18:55 UTCJul 19, 19:05 UTC10m
2026-07-19 JJA2503 ICN → BKK Jul 19, 16:40 UTCJul 19, 16:50 UTC10m
2026-07-19 JJA2503 ICN → BKK Jul 19, 11:45 UTCJul 19, 14:30 UTC2h 45m
2026-07-19 JJA1802 - Jul 19, 08:05 UTCJul 19, 09:55 UTC1h 50m
2026-07-19 JJA1801 - Jul 19, 05:55 UTCJul 19, 06:25 UTC30m
2026-07-19 JJA1801 - Jul 19, 04:35 UTCJul 19, 05:10 UTC35m
2026-07-19 JJA1302 ICN → KIX Jul 19, 01:30 UTCJul 19, 02:55 UTC1h 25m
2026-07-18 JJA1301 KIX → ICN Jul 18, 22:20 UTCJul 18, 23:40 UTC1h 20m
2026-07-18 JJA1108 NRT → ICN Jul 18, 10:05 UTCJul 18, 12:00 UTC1h 55m

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.

Mode-S 71C739 frequently asked

What is Mode-S code 71C739?
71C739 is an ICAO 24-bit transponder address. Allocated to Korea, South.
Where is Mode-S 71C739 registered?
Mode-S code 71C739 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 71C739 broadcasting right now?
No active broadcast right now. Last signal was 11d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C739, octal 34343471, decimal 7,456,569.
What flights does 71C739 operate?
Mode-S 71C739 has broadcast 20 distinct callsigns, including JJA154, JJA151, JJA153, JJA152, JJA155.