Apparatus

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sensors Mode-S transponder

71C740

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

Hex
71C740
Octal
34343500
Decimal
7,456,576
Country
KR
Broadcasting now · callsign JJA8501 · 18,000 ft
Flights observed
375
Distinct callsigns
20
Country
KR
Last broadcast
23d ago

Current position

71C740 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C740 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
JJA136 - 18 2026-06-19
JJA127 - 17 2026-06-19
JJA226 - 16 2026-06-19
JJA225 - 16 2026-06-19
JJA152 - 12 2026-06-18
JJA151 - 12 2026-06-18
JJA153 - 11 2026-06-19
JJA154 - 10 2026-06-19
JJA118 Jeju Air 10 2026-06-10
JJA113 Jeju Air 10 2026-06-10
JJA105 Jeju Air 10 2026-06-09
JJA104 Jeju Air 10 2026-06-10
JJA212 - 8 2026-06-25
JJA211 - 8 2026-06-26
JJA158 - 8 2026-06-25
JJA155 - 8 2026-06-26
JJA116 - 8 2026-06-26
JJA101 Jeju Air 8 2026-06-25
JJA157 - 7 2026-06-25
JJA1404 - 7 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA1308 KIX → ICN Jul 26, 11:05 UTCJul 26, 12:25 UTC1h 20m
2026-07-26 JJA1307 ICN → KIX Jul 26, 08:20 UTCJul 26, 09:45 UTC1h 25m
2026-07-26 JJA1176 NRT → ICN Jul 26, 04:50 UTCJul 26, 06:50 UTC2h 1m
2026-07-26 JJA1175 NRT → PUS Jul 26, 01:10 UTCJul 26, 03:10 UTC2h 0m
2026-07-25 JJA1106 NRT → ICN Jul 25, 10:10 UTCJul 25, 12:05 UTC1h 55m
2026-07-25 JJA1105 NRT → ICN Jul 25, 06:20 UTCJul 25, 08:20 UTC2h 0m
2026-07-25 JJA8402 TAO → ICN Jul 25, 04:00 UTCJul 25, 04:35 UTC35m
2026-07-24 JJA8401 ICN → TAO Jul 24, 23:20 UTCJul 24, 23:45 UTC25m
2026-07-24 JJA1308 KIX → ICN Jul 24, 11:10 UTCJul 24, 12:30 UTC1h 20m
2026-07-24 JJA1307 ICN → KIX Jul 24, 08:30 UTCJul 24, 09:50 UTC1h 20m
2026-07-24 JJA8502 WEH → ICN Jul 24, 06:35 UTCJul 24, 06:55 UTC20m
2026-07-24 JJA8501 ICN → WEH Jul 24, 02:00 UTCJul 24, 02:15 UTC15m
2026-07-23 JJA2504 BKK → ICN Jul 23, 18:55 UTCJul 23, 23:55 UTC5h 0m
2026-07-23 JJA2503 ICN → BKK Jul 23, 12:00 UTCJul 23, 17:10 UTC5h 10m
2026-07-23 JJA1802 OKA → ICN Jul 23, 08:25 UTCJul 23, 10:15 UTC1h 50m
2026-07-23 JJA1801 ICN → OKA Jul 23, 06:10 UTCJul 23, 06:30 UTC20m
2026-07-23 JJA1801 ICN → OKA Jul 23, 04:40 UTCJul 23, 05:15 UTC35m
2026-07-23 JJA1302 ICN → KIX Jul 23, 01:20 UTCJul 23, 02:40 UTC1h 20m
2026-07-22 JJA1301 KIX → ICN Jul 22, 22:30 UTCJul 22, 23:50 UTC1h 20m
2026-07-22 JJA6014 - Jul 22, 17:05 UTCJul 22, 20:25 UTC3h 20m
2026-07-22 JJA6013 ICN → HKG Jul 22, 12:35 UTCJul 22, 15:45 UTC3h 10m
2026-07-22 JJA1105 NRT → ICN Jul 22, 04:50 UTCJul 22, 11:30 UTC6h 40m
2026-07-22 JJA1302 ICN → KIX Jul 22, 01:40 UTCJul 22, 03:00 UTC1h 20m
2026-07-21 JJA1301 KIX → ICN Jul 21, 22:30 UTCJul 21, 23:50 UTC1h 20m
2026-07-21 JJA6014 - Jul 21, 17:00 UTCJul 21, 20:10 UTC3h 10m
2026-07-21 JJA6013 ICN → HKG Jul 21, 12:15 UTCJul 21, 15:20 UTC3h 5m
2026-07-21 JJA1406 FUK → ICN Jul 21, 09:30 UTCJul 21, 10:25 UTC55m
2026-07-21 JJA1405 ICN → FUK Jul 21, 07:10 UTCJul 21, 08:15 UTC1h 5m
2026-07-21 JJA1502 - Jul 21, 03:15 UTCJul 21, 05:35 UTC2h 20m
2026-07-20 JJA1501 ICN → CTS Jul 20, 22:35 UTCJul 21, 00:45 UTC2h 9m
2026-07-20 JJA6014 HKG → ICN Jul 20, 16:55 UTCJul 20, 20:00 UTC3h 5m
2026-07-20 JJA6013 ICN → HKG Jul 20, 12:05 UTCJul 20, 15:15 UTC3h 10m
2026-07-20 JJA1176 NRT → ICN Jul 20, 04:45 UTCJul 20, 06:45 UTC2h 0m
2026-07-20 JJA1175 NRT → PUS Jul 20, 01:20 UTCJul 20, 03:15 UTC1h 55m
2026-07-19 JJA1308 KIX → ICN Jul 19, 11:05 UTCJul 19, 12:25 UTC1h 20m
2026-07-19 JJA1307 ICN → KIX Jul 19, 08:10 UTCJul 19, 09:45 UTC1h 35m
2026-07-19 JJA6102 TPE → ICN Jul 19, 04:15 UTCJul 19, 06:25 UTC2h 10m
2026-07-19 JJA6101 ICN → TPE Jul 19, 00:25 UTCJul 19, 02:25 UTC2h 0m
2026-07-18 JJA2516 - Jul 18, 16:15 UTCJul 18, 21:35 UTC5h 20m
2026-07-18 JJA2515 - Jul 18, 09:30 UTCJul 18, 14:05 UTC4h 35m
2026-07-18 JJA1104 NRT → ICN Jul 18, 05:20 UTCJul 18, 07:20 UTC2h 0m
2026-07-18 JJA1103 ICN → NRT Jul 18, 01:39 UTCJul 18, 03:35 UTC1h 56m
2026-07-17 JJA1108 NRT → ICN Jul 17, 10:05 UTCJul 17, 11:55 UTC1h 50m
2026-07-17 JJA1107 - Jul 17, 06:20 UTCJul 17, 08:25 UTC2h 5m
2026-07-17 JJA1404 - Jul 17, 03:30 UTCJul 17, 04:35 UTC1h 5m
2026-07-17 JJA1403 ICN → FUK Jul 17, 01:05 UTCJul 17, 01:45 UTC40m
2026-07-16 JJA2624 - Jul 16, 20:25 UTCJul 16, 23:25 UTC3h 0m
2026-07-16 JJA2624 - Jul 16, 17:10 UTCJul 16, 17:20 UTC10m
2026-07-16 JJA2623 - Jul 16, 15:14 UTCJul 16, 15:30 UTC15m
2026-07-16 JJA2623 - Jul 16, 09:40 UTCJul 16, 12:25 UTC2h 45m

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 71C740 frequently asked

What is Mode-S code 71C740?
71C740 is an ICAO 24-bit transponder address. Allocated to Korea, South.
Where is Mode-S 71C740 registered?
Mode-S code 71C740 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 71C740 broadcasting right now?
Yes. Mode-S 71C740 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C740, octal 34343500, decimal 7,456,576.
What flights does 71C740 operate?
Mode-S 71C740 has broadcast 20 distinct callsigns, including JJA136, JJA127, JJA226, JJA225, JJA152.