Apparatus

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sensors Mode-S transponder

71C243

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

Currently assigned to HL8243 · BOEING 737-800

Hex
71C243
Octal
34341103
Decimal
7,455,299
Country
KR
Tail
HL8243
Type
B738
No current signal · last broadcast 9h ago
Flights observed
419
Distinct callsigns
20
Country
KR
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 71C243.

Country allocation

The ICAO 24-bit address 71C243 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
JNA236 - 14 2026-07-10
JNA037 - 11 2026-07-11
JNA256 - 10 2026-06-22
JNA752 - 8 2026-07-02
JNA742 - 8 2026-07-12
JNA201 Jin Air 8 2026-07-01
JNA251 - 7 2026-07-10
JNA222 - 7 2026-07-02
JNA751 - 6 2026-07-02
JNA738 Jin Air 6 2026-06-05
JNA737 Jin Air 6 2026-06-05
JNA713 - 6 2026-07-03
JNA401 - 6 2026-07-13
JNA371 - 6 2026-06-20
JNA273 Jin Air 6 2026-06-09
JNA255 - 6 2026-06-21
JNA234 - 6 2026-06-29
JNA231 Jin Air 6 2026-06-19
JNA202 Jin Air 6 2026-06-07
JNA741 - 5 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JNA564 - Jul 14, 08:40 UTCJul 14, 08:55 UTC15m
2026-07-14 JNA567 - Jul 14, 06:10 UTCJul 14, 06:30 UTC20m
2026-07-14 JNA562 - Jul 14, 04:50 UTCJul 14, 05:05 UTC15m
2026-07-14 JNA463 - Jul 14, 02:25 UTCJul 14, 02:35 UTC10m
2026-07-14 JNA464 - Jul 14, 00:55 UTCJul 14, 01:05 UTC10m
2026-07-13 JNA505 - Jul 13, 22:50 UTCJul 13, 23:25 UTC35m
2026-07-13 JNA512 - Jul 13, 12:55 UTCJul 13, 13:35 UTC40m
2026-07-13 JNA569 - Jul 13, 10:55 UTCJul 13, 11:10 UTC15m
2026-07-13 JNA566 - Jul 13, 09:40 UTCJul 13, 10:05 UTC25m
2026-07-13 JNA427 - Jul 13, 07:15 UTCJul 13, 07:55 UTC40m
2026-07-13 JNA428 - Jul 13, 05:40 UTCJul 13, 06:01 UTC20m
2026-07-13 JNA401 - Jul 13, 03:01 UTCJul 13, 03:30 UTC30m
2026-07-13 JNA402 - Jul 13, 01:25 UTCJul 13, 01:55 UTC30m
2026-07-12 JNA563 - Jul 12, 23:10 UTCJul 12, 23:25 UTC15m
2026-07-12 JNA922 PUS → PUS Jul 12, 11:45 UTCJul 12, 21:10 UTC9h 25m
2026-07-12 JNA254 KIX → PUS Jul 12, 09:05 UTCJul 12, 10:05 UTC1h 0m
2026-07-12 JNA253 PUS → KIX Jul 12, 06:50 UTCJul 12, 07:50 UTC1h 0m
2026-07-12 JNA742 - Jul 12, 05:25 UTCJul 12, 05:40 UTC15m
2026-07-12 JNA742 - Jul 12, 03:45 UTCJul 12, 04:15 UTC30m
2026-07-12 JNA741 - Jul 12, 00:25 UTCJul 12, 02:15 UTC1h 50m
2026-07-11 JNA066 - Jul 11, 19:35 UTCJul 11, 22:35 UTC3h 0m
2026-07-11 JNA037 - Jul 11, 14:55 UTCJul 11, 18:20 UTC3h 25m
2026-07-11 JNA266 - Jul 11, 09:20 UTCJul 11, 10:15 UTC55m
2026-07-11 LJ265 - Jul 11, 06:55 UTCJul 11, 07:55 UTC1h 0m
2026-07-10 JNA002 - Jul 10, 19:55 UTCJul 11, 01:10 UTC5h 15m
2026-07-10 JNA001 ICN → BKK Jul 10, 12:55 UTCJul 10, 18:00 UTC5h 5m
2026-07-10 JNA236 KIX → ICN Jul 10, 07:20 UTCJul 10, 08:45 UTC1h 25m
2026-07-10 JNA251 PUS → KIX Jul 10, 04:50 UTCJul 10, 06:00 UTC1h 10m
2026-07-09 JNA062 - Jul 9, 23:05 UTCJul 9, 23:25 UTC20m
2026-07-09 JNA031 - Jul 9, 14:15 UTCJul 9, 22:00 UTC7h 45m
2026-07-09 JNA272 - Jul 9, 11:15 UTCJul 9, 12:20 UTC1h 5m
2026-07-09 JNA271 - Jul 9, 08:30 UTCJul 9, 09:10 UTC40m
2026-07-08 JNA132 - Jul 8, 20:55 UTCJul 8, 21:35 UTC40m
2026-07-08 JNA132 - Jul 8, 16:40 UTCJul 8, 20:05 UTC3h 25m
2026-07-08 JNA131 - Jul 8, 10:40 UTCJul 8, 15:25 UTC4h 45m
2026-07-08 JNA342 - Jul 8, 06:05 UTCJul 8, 06:50 UTC45m
2026-07-08 JNA342 - Jul 8, 05:05 UTCJul 8, 05:15 UTC10m
2026-07-08 JNA341 - Jul 8, 03:15 UTCJul 8, 03:35 UTC20m
2026-07-08 JNA341 - Jul 8, 01:50 UTCJul 8, 02:25 UTC35m
2026-07-07 JNA032 - Jul 7, 13:00 UTCJul 7, 22:45 UTC9h 45m
2026-07-06 JNA240 KIX → ICN Jul 6, 10:25 UTCJul 6, 11:55 UTC1h 30m
2026-07-06 JNA239 ICN → KIX Jul 6, 07:35 UTCJul 6, 08:55 UTC1h 20m
2026-07-05 JNA032 PUS → ICN Jul 5, 13:20 UTCJul 5, 23:00 UTC9h 40m
2026-07-05 JNA568 - Jul 5, 10:50 UTCJul 5, 11:10 UTC20m
2026-07-05 JNA467 - Jul 5, 09:05 UTCJul 5, 09:15 UTC10m
2026-07-05 JNA437 - Jul 5, 05:15 UTCJul 5, 05:30 UTC15m
2026-07-05 JNA436 - Jul 5, 03:40 UTCJul 5, 03:50 UTC10m
2026-07-05 JNA435 - Jul 5, 01:55 UTCJul 5, 02:15 UTC20m
2026-07-05 JNA659 - Jul 5, 00:10 UTCJul 5, 00:35 UTC25m
2026-07-04 JNA512 - Jul 4, 12:45 UTCJul 4, 13:20 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 HL8243 page for operator, model, and routing details .

Mode-S 71C243 frequently asked

What is Mode-S code 71C243?
71C243 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8243.
Where is Mode-S 71C243 registered?
Mode-S code 71C243 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 71C243 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C243, octal 34341103, decimal 7,455,299.
What flights does 71C243 operate?
Mode-S 71C243 has broadcast 20 distinct callsigns, including JNA236, JNA037, JNA256, JNA752, JNA742.