Apparatus

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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
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
499
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S 71C331.

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
JJA2103 Jeju Air 9 2026-07-25
JJA2104 Jeju Air 8 2026-07-25
JJA212 - 7 2026-07-09
JJA1702 Jeju Air 7 2026-07-21
JJA1701 Jeju Air 7 2026-07-20
JJA1504 - 7 2026-07-15
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
JJA1622 Jeju Air 6 2026-07-26
JJA1621 Jeju Air 6 2026-07-26
JJA1503 - 6 2026-07-15
JJA139 Jeju Air 6 2026-05-31
JJA130 Jeju Air 6 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA2402 VTE → ICN Jul 26, 12:00 UTCJul 26, 22:15 UTC10h 15m
2026-07-26 JJA1622 UKB → ICN Jul 26, 07:05 UTCJul 26, 08:30 UTC1h 25m
2026-07-26 JJA1621 ICN → UKB Jul 26, 04:35 UTCJul 26, 06:05 UTC1h 30m
2026-07-26 JJA1602 FSZ → ICN Jul 26, 01:15 UTCJul 26, 02:55 UTC1h 40m
2026-07-25 JJA1601 ICN → FSZ Jul 25, 22:15 UTCJul 25, 23:50 UTC1h 35m
2026-07-25 JJA2104 MNL → ICN Jul 25, 15:55 UTCJul 25, 19:30 UTC3h 35m
2026-07-25 JJA2103 ICN → MNL Jul 25, 10:20 UTCJul 25, 13:50 UTC3h 30m
2026-07-25 JJA1704 MYJ → ICN Jul 25, 06:45 UTCJul 25, 07:55 UTC1h 10m
2026-07-25 JJA1703 ICN → MYJ Jul 25, 04:35 UTCJul 25, 05:35 UTC1h 0m
2026-07-25 JJA1402 FUK → ICN Jul 25, 00:10 UTCJul 25, 01:20 UTC1h 10m
2026-07-24 JJA1401 ICN → FUK Jul 24, 21:45 UTCJul 24, 22:30 UTC45m
2026-07-24 JJA1408 FUK → ICN Jul 24, 11:00 UTCJul 24, 12:00 UTC1h 0m
2026-07-24 JJA1407 ICN → FUK Jul 24, 08:40 UTCJul 24, 09:20 UTC40m
2026-07-24 JJA1616 HIJ → ICN Jul 24, 05:50 UTCJul 24, 07:00 UTC1h 10m
2026-07-24 JJA1615 ICN → HIJ Jul 24, 03:20 UTCJul 24, 04:25 UTC1h 5m
2026-07-24 JJA1396 KIX → ICN Jul 24, 00:00 UTCJul 24, 01:15 UTC1h 15m
2026-07-23 JJA1395 ICN → KIX Jul 23, 10:40 UTCJul 23, 12:05 UTC1h 25m
2026-07-23 JJA1622 UKB → ICN Jul 23, 07:10 UTCJul 23, 08:30 UTC1h 20m
2026-07-23 JJA1621 ICN → UKB Jul 23, 04:50 UTCJul 23, 06:15 UTC1h 25m
2026-07-23 JJA1612 HIJ → ICN Jul 23, 01:40 UTCJul 23, 02:55 UTC1h 15m
2026-07-22 JJA1611 ICN → HIJ Jul 22, 23:00 UTCJul 23, 00:10 UTC1h 10m
2026-07-22 JJA1308 KIX → ICN Jul 22, 11:10 UTCJul 22, 12:30 UTC1h 20m
2026-07-22 JJA1102 ICN → NRT Jul 22, 04:25 UTCJul 22, 05:25 UTC1h 0m
2026-07-21 JJA1101 ICN → NRT Jul 21, 23:25 UTCJul 22, 01:25 UTC2h 0m
2026-07-21 JJA2104 MNL → ICN Jul 21, 15:40 UTCJul 21, 19:10 UTC3h 30m
2026-07-21 JJA2103 ICN → MNL Jul 21, 10:25 UTCJul 21, 14:05 UTC3h 40m
2026-07-21 JJA1622 UKB → ICN Jul 21, 07:00 UTCJul 21, 08:25 UTC1h 25m
2026-07-21 JJA1621 ICN → UKB Jul 21, 04:40 UTCJul 21, 06:00 UTC1h 20m
2026-07-21 JJA1702 MYJ → ICN Jul 21, 00:40 UTCJul 21, 01:50 UTC1h 10m
2026-07-20 JJA1701 ICN → MYJ Jul 20, 22:15 UTCJul 20, 23:20 UTC1h 5m
2026-07-20 JJA1604 FSZ → ICN Jul 20, 09:20 UTCJul 20, 11:10 UTC1h 50m
2026-07-20 JJA1603 ICN → FSZ Jul 20, 06:20 UTCJul 20, 07:55 UTC1h 35m
2026-07-20 JJA1602 FSZ → ICN Jul 20, 01:20 UTCJul 20, 03:00 UTC1h 40m
2026-07-19 JJA1601 ICN → FSZ Jul 19, 22:15 UTCJul 20, 00:00 UTC1h 45m
2026-07-19 JJA1408 - Jul 19, 11:00 UTCJul 19, 12:00 UTC1h 0m
2026-07-19 JJA1407 - Jul 19, 08:35 UTCJul 19, 09:20 UTC45m
2026-07-19 JJA1102 ICN → NRT Jul 19, 03:05 UTCJul 19, 04:55 UTC1h 50m
2026-07-18 JJA1101 ICN → NRT Jul 18, 23:30 UTCJul 19, 01:25 UTC1h 55m
2026-07-18 JJA1408 - Jul 18, 11:05 UTCJul 18, 12:00 UTC55m
2026-07-18 JJA1407 - Jul 18, 08:30 UTCJul 18, 09:20 UTC50m
2026-07-18 JJA1616 - Jul 18, 05:50 UTCJul 18, 07:00 UTC1h 10m
2026-07-18 JJA1615 ICN → HIJ Jul 18, 03:10 UTCJul 18, 04:20 UTC1h 10m
2026-07-18 JJA1402 FUK → ICN Jul 18, 00:04 UTCJul 18, 01:00 UTC55m
2026-07-17 JJA1401 ICN → FUK Jul 17, 21:39 UTCJul 17, 22:25 UTC45m
2026-07-17 JJA1604 - Jul 17, 09:25 UTCJul 17, 11:00 UTC1h 35m
2026-07-17 JJA1603 - Jul 17, 06:15 UTCJul 17, 07:50 UTC1h 35m
2026-07-17 JJA1304 - Jul 17, 03:14 UTCJul 17, 04:29 UTC1h 15m
2026-07-17 JJA1303 ICN → KIX Jul 17, 00:20 UTCJul 17, 01:39 UTC1h 20m
2026-07-16 JJA8904 - Jul 16, 12:34 UTCJul 16, 12:55 UTC20m
2026-07-16 JJA8903 - Jul 16, 07:05 UTCJul 16, 07:40 UTC35m

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?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
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, JJA2103.