Apparatus

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sensors Mode-S transponder

71C223

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

Currently assigned to HL8223 · BOEING 737-900

Hex
71C223
Octal
34341043
Decimal
7,455,267
Country
KR
Tail
HL8223
Type
B739
No current signal · last broadcast Jul 26, 13:15 UTC
Flights observed
228
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 13:15 UTC

Last known position

Most recent position reported by Mode-S 71C223.

Country allocation

The ICAO 24-bit address 71C223 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
KAL115 Korean Air 15 2026-07-26
KAL2134 - 14 2026-07-07
KAL1402 Korean Air 14 2026-07-23
KAL2133 - 13 2026-07-07
KAL1432 - 13 2026-07-11
KAL1431 - 13 2026-07-11
KAL1405 Korean Air 13 2026-07-26
KAL116 Korean Air 13 2026-07-26
KAL133 - 10 2026-07-14
KAL2081 - 9 2026-06-13
KAL134 - 8 2026-07-15
KAL126 Korean Air 8 2026-07-24
KAL125 Korean Air 7 2026-07-24
KAL2082 - 5 2026-07-07
KAL108 - 5 2026-07-10
KAL620 - 4 2026-07-19
KAL619 - 4 2026-07-19
KAL2062 Korean Air 4 2026-06-10
KAL107 - 4 2026-07-01
KAL2061 Korean Air 3 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL1562 CJU → PUS Jul 26, 12:55 UTCJul 26, 13:15 UTC20m
2026-07-26 KAL1549 PUS → CJU Jul 26, 10:50 UTCJul 26, 11:05 UTC15m
2026-07-26 KAL1405 ICN → PUS Jul 26, 08:30 UTCJul 26, 09:10 UTC40m
2026-07-26 KAL116 YNJ → ICN Jul 26, 06:00 UTCJul 26, 06:30 UTC30m
2026-07-26 KAL115 ICN → YNJ Jul 26, 00:55 UTCJul 26, 01:30 UTC35m
2026-07-25 KAL1412 PUS → ICN Jul 25, 10:20 UTCJul 25, 11:00 UTC40m
2026-07-25 KAL1405 ICN → PUS Jul 25, 08:35 UTCJul 25, 09:10 UTC35m
2026-07-24 KAL128 FOC → ICN Jul 24, 23:30 UTCJul 25, 06:20 UTC6h 50m
2026-07-24 KAL146 CSX → ICN Jul 24, 19:25 UTCJul 24, 19:50 UTC25m
2026-07-24 KAL145 ICN → CSX Jul 24, 13:00 UTCJul 24, 14:25 UTC1h 25m
2026-07-24 KAL126 MEL → ICN Jul 24, 07:50 UTCJul 24, 08:35 UTC45m
2026-07-24 KAL125 ICN → MEL Jul 24, 01:55 UTCJul 24, 02:30 UTC35m
2026-07-23 KAL1402 PUS → ICN Jul 23, 22:15 UTCJul 23, 23:05 UTC50m
2026-07-23 KAL1562 CJU → PUS Jul 23, 12:35 UTCJul 23, 12:50 UTC15m
2026-07-23 KAL1549 PUS → CJU Jul 23, 10:35 UTCJul 23, 10:50 UTC15m
2026-07-23 KAL1405 ICN → PUS Jul 23, 08:30 UTCJul 23, 09:10 UTC40m
2026-07-23 KAL116 YNJ → ICN Jul 23, 06:25 UTCJul 23, 06:50 UTC25m
2026-07-23 KAL115 ICN → YNJ Jul 23, 01:10 UTCJul 23, 01:35 UTC25m
2026-07-22 KAL115 ICN → YNJ Jul 22, 01:10 UTCJul 22, 02:00 UTC50m
2026-07-20 KAL127 ICN → FOC Jul 20, 23:35 UTCJul 21, 06:15 UTC6h 40m
2026-07-20 KAL146 CSX → ICN Jul 20, 20:05 UTCJul 20, 20:45 UTC40m
2026-07-20 KAL145 ICN → CSX Jul 20, 14:10 UTCJul 20, 14:35 UTC25m
2026-07-20 KAL125 ICN → MEL Jul 20, 01:50 UTCJul 20, 08:45 UTC6h 55m
2026-07-19 KAL620 - Jul 19, 19:45 UTCJul 19, 23:05 UTC3h 20m
2026-07-19 KAL619 - Jul 19, 14:15 UTCJul 19, 17:50 UTC3h 35m
2026-07-19 KAL126 - Jul 19, 01:55 UTCJul 19, 08:20 UTC6h 25m
2026-07-18 KAL116 - Jul 18, 05:40 UTCJul 18, 06:00 UTC20m
2026-07-18 KAL115 - Jul 18, 00:45 UTCJul 18, 01:05 UTC20m
2026-07-17 KAL126 - Jul 17, 02:05 UTCJul 17, 08:59 UTC6h 55m
2026-07-16 KAL782 - Jul 16, 12:09 UTCJul 16, 13:05 UTC55m
2026-07-16 KAL781 - Jul 16, 09:50 UTCJul 16, 10:29 UTC40m
2026-07-16 KAL116 - Jul 16, 06:15 UTCJul 16, 06:35 UTC20m
2026-07-16 KAL115 - Jul 16, 00:50 UTCJul 16, 01:15 UTC25m
2026-07-15 KAL1402 - Jul 15, 22:05 UTCJul 15, 22:50 UTC45m
2026-07-15 KAL1562 - Jul 15, 12:35 UTCJul 15, 12:50 UTC15m
2026-07-15 KAL1549 - Jul 15, 10:35 UTCJul 15, 10:45 UTC10m
2026-07-15 KAL1405 - Jul 15, 08:30 UTCJul 15, 09:15 UTC45m
2026-07-15 KAL134 - Jul 15, 04:45 UTCJul 15, 05:05 UTC20m
2026-07-14 KAL133 - Jul 14, 23:25 UTCJul 14, 23:45 UTC20m
2026-07-13 KAL134 - Jul 13, 04:40 UTCJul 13, 05:05 UTC25m
2026-07-12 KAL133 - Jul 12, 23:30 UTCJul 12, 23:55 UTC25m
2026-07-11 KAL1432 - Jul 11, 23:05 UTCJul 11, 23:35 UTC30m
2026-07-11 KAL1431 - Jul 11, 10:15 UTCJul 11, 10:40 UTC25m
2026-07-10 KAL1432 - Jul 10, 23:00 UTCJul 10, 23:35 UTC35m
2026-07-10 KAL1431 - Jul 10, 10:05 UTCJul 10, 10:40 UTC35m
2026-07-10 KAL108 - Jul 10, 03:30 UTCJul 10, 08:40 UTC5h 10m
2026-07-09 KAL1432 - Jul 9, 23:00 UTCJul 9, 23:30 UTC30m
2026-07-09 KAL1431 - Jul 9, 10:10 UTCJul 9, 10:40 UTC30m
2026-07-09 KAL116 - Jul 9, 06:20 UTCJul 9, 06:40 UTC20m
2026-07-09 KAL115 - Jul 9, 00:50 UTCJul 9, 01:10 UTC20m

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 HL8223 page for operator, model, and routing details .

Mode-S 71C223 frequently asked

What is Mode-S code 71C223?
71C223 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8223.
Where is Mode-S 71C223 registered?
Mode-S code 71C223 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 71C223 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C223, octal 34341043, decimal 7,455,267.
What flights does 71C223 operate?
Mode-S 71C223 has broadcast 20 distinct callsigns, including KAL115, KAL2134, KAL1402, KAL2133, KAL1432.