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sensors Mode-S transponder

71C331

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

Currently assigned to HL8331 · BOEING 737-800

Hex
71C331
Octal
34341461
Decimal
7,455,537
Country
KR
Tail
HL8331
Type
B738
Broadcasting now · callsign JJA5285 · 25,600 ft
Flights observed
439
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Current position

71C331 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C331 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
JJA1326 - 18 2026-07-08
JJA1328 - 15 2026-07-08
JJA1327 - 15 2026-07-08
JJA1325 Jeju Air 15 2026-07-07
JJA212 - 7 2026-07-09
JJA2103 - 7 2026-07-13
JJA140 - 7 2026-07-08
JJA137 - 7 2026-07-08
JJA119 Jeju Air 7 2026-06-03
JJA101 - 7 2026-07-09
JJA211 - 6 2026-07-10
JJA2104 - 6 2026-07-13
JJA1702 - 6 2026-07-05
JJA1701 - 6 2026-07-04
JJA1504 - 6 2026-06-23
JJA139 Jeju Air 6 2026-05-31
JJA130 Jeju Air 6 2026-06-03
JJA116 - 6 2026-07-10
JJA5204 - 5 2026-07-04
JJA5203 - 5 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JJA1612 HIJ → ICN Jul 14, 01:40 UTCJul 14, 02:45 UTC1h 5m
2026-07-13 JJA1611 - Jul 13, 23:00 UTCJul 14, 00:05 UTC1h 5m
2026-07-13 JJA2104 MNL → ICN Jul 13, 15:55 UTCJul 13, 19:25 UTC3h 30m
2026-07-13 JJA2103 ICN → MNL Jul 13, 10:35 UTCJul 13, 14:20 UTC3h 45m
2026-07-13 JJA1704 - Jul 13, 06:50 UTCJul 13, 08:01 UTC1h 10m
2026-07-13 JJA1703 - Jul 13, 04:25 UTCJul 13, 05:31 UTC1h 5m
2026-07-13 JJA1612 - Jul 13, 01:35 UTCJul 13, 02:50 UTC1h 15m
2026-07-12 JJA1611 ICN → HIJ Jul 12, 23:00 UTCJul 13, 00:05 UTC1h 5m
2026-07-12 JJA1172 NRT → ICN Jul 12, 08:50 UTCJul 12, 10:40 UTC1h 50m
2026-07-12 JJA1171 ICN → NRT Jul 12, 05:05 UTCJul 12, 07:05 UTC2h 0m
2026-07-12 JJA1282 - Jul 12, 01:35 UTCJul 12, 03:05 UTC1h 30m
2026-07-11 JJA1281 - Jul 11, 22:50 UTCJul 12, 00:15 UTC1h 25m
2026-07-11 JJA8904 - Jul 11, 12:10 UTCJul 11, 12:30 UTC20m
2026-07-11 JJA8903 - Jul 11, 07:10 UTCJul 11, 08:01 UTC50m
2026-07-11 JJA1812 - Jul 11, 03:50 UTCJul 11, 04:50 UTC1h 0m
2026-07-11 JJA1811 - Jul 11, 01:10 UTCJul 11, 02:10 UTC1h 0m
2026-07-10 JJA166 - Jul 10, 07:20 UTCJul 10, 08:05 UTC45m
2026-07-10 JJA155 - Jul 10, 05:10 UTCJul 10, 05:45 UTC35m
2026-07-10 JJA116 - Jul 10, 03:15 UTCJul 10, 03:55 UTC40m
2026-07-10 JJA211 - Jul 10, 01:10 UTCJul 10, 01:40 UTC30m
2026-07-09 JJA212 - Jul 9, 23:35 UTCJul 10, 00:05 UTC30m
2026-07-09 JJA101 - Jul 9, 21:30 UTCJul 9, 22:05 UTC35m
2026-07-09 JJA134 - Jul 9, 12:05 UTCJul 9, 12:40 UTC35m
2026-07-09 JJA135 - Jul 9, 09:50 UTCJul 9, 10:35 UTC45m
2026-07-09 JJA126 - Jul 9, 08:05 UTCJul 9, 08:50 UTC45m
2026-07-09 JJA125 - Jul 9, 05:55 UTCJul 9, 06:30 UTC35m
2026-07-09 JJA154 - Jul 9, 04:00 UTCJul 9, 04:40 UTC40m
2026-07-09 JJA153 - Jul 9, 01:40 UTCJul 9, 02:20 UTC40m
2026-07-09 JJA152 - Jul 9, 00:05 UTCJul 9, 00:50 UTC45m
2026-07-08 JJA151 - Jul 8, 21:45 UTCJul 8, 22:30 UTC45m
2026-07-08 JJA140 - Jul 8, 12:35 UTCJul 8, 13:15 UTC40m
2026-07-08 JJA137 - Jul 8, 10:35 UTCJul 8, 11:10 UTC35m
2026-07-08 JJA1328 KIX → GMP Jul 8, 07:55 UTCJul 8, 09:15 UTC1h 20m
2026-07-08 JJA1327 GMP → KIX Jul 8, 05:10 UTCJul 8, 06:45 UTC1h 35m
2026-07-08 JJA1326 - Jul 8, 02:15 UTCJul 8, 03:40 UTC1h 25m
2026-07-07 JJA1325 GMP → KIX Jul 7, 23:15 UTCJul 8, 00:40 UTC1h 25m
2026-07-07 JJA1328 KIX → GMP Jul 7, 07:40 UTCJul 7, 08:55 UTC1h 15m
2026-07-07 JJA1327 GMP → KIX Jul 7, 05:00 UTCJul 7, 06:20 UTC1h 20m
2026-07-07 JJA1326 - Jul 7, 02:10 UTCJul 7, 03:30 UTC1h 20m
2026-07-06 JJA1325 GMP → KIX Jul 6, 23:20 UTCJul 7, 00:45 UTC1h 25m
2026-07-06 JJA158 - Jul 6, 11:25 UTCJul 6, 12:10 UTC45m
2026-07-06 JJA167 - Jul 6, 09:30 UTCJul 6, 10:05 UTC35m
2026-07-06 JJA8802 - Jul 6, 06:15 UTCJul 6, 06:40 UTC25m
2026-07-06 JJA8801 - Jul 6, 01:20 UTCJul 6, 01:40 UTC20m
2026-07-05 JJA1622 UKB → ICN Jul 5, 06:55 UTCJul 5, 08:35 UTC1h 40m
2026-07-05 JJA1621 ICN → UKB Jul 5, 04:35 UTCJul 5, 05:45 UTC1h 10m
2026-07-05 JJA1702 - Jul 5, 00:35 UTCJul 5, 01:50 UTC1h 15m
2026-07-04 JJA1701 - Jul 4, 22:05 UTCJul 4, 23:10 UTC1h 5m
2026-07-04 JJA2104 MNL → ICN Jul 4, 15:50 UTCJul 4, 19:20 UTC3h 30m
2026-07-04 JJA2103 ICN → MNL Jul 4, 10:45 UTCJul 4, 14:20 UTC3h 35m

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 HL8331 page for operator, model, and routing details .

Mode-S 71C331 frequently asked

What is Mode-S code 71C331?
71C331 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8331.
Where is Mode-S 71C331 registered?
Mode-S code 71C331 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 71C331 broadcasting right now?
Yes. Mode-S 71C331 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C331, octal 34341461, decimal 7,455,537.
What flights does 71C331 operate?
Mode-S 71C331 has broadcast 20 distinct callsigns, including JJA1326, JJA1328, JJA1327, JJA1325, JJA212.