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 1d ago
Flights observed
189
Distinct callsigns
20
Country
KR
Last broadcast
1d ago

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
KAL2134 - 14 2026-07-07
KAL2133 - 13 2026-07-07
KAL1432 - 13 2026-07-11
KAL1431 - 13 2026-07-11
KAL1402 - 12 2026-07-08
KAL115 - 10 2026-07-09
KAL2081 - 9 2026-06-13
KAL1405 - 9 2026-07-06
KAL133 - 9 2026-07-12
KAL116 - 9 2026-07-09
KAL134 - 7 2026-07-13
KAL2082 - 5 2026-07-07
KAL126 - 5 2026-06-28
KAL125 - 5 2026-06-28
KAL108 - 5 2026-07-10
KAL2062 Korean Air 4 2026-06-10
KAL107 - 4 2026-07-01
KAL620 - 3 2026-06-30
KAL619 - 3 2026-06-30
KAL2061 Korean Air 3 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-08 KAL1402 PUS → ICN Jul 8, 22:15 UTCJul 8, 23:00 UTC45m
2026-07-08 KAL1409 - Jul 8, 12:15 UTCJul 8, 13:00 UTC45m
2026-07-08 KAL108 - Jul 8, 05:00 UTCJul 8, 10:35 UTC5h 35m
2026-07-07 KAL1402 PUS → ICN Jul 7, 22:20 UTCJul 7, 23:05 UTC45m
2026-07-07 KAL2134 - Jul 7, 11:30 UTCJul 7, 12:35 UTC1h 5m
2026-07-07 KAL2133 - Jul 7, 08:50 UTCJul 7, 09:55 UTC1h 5m
2026-07-07 KAL2082 PUS → PUS Jul 7, 02:10 UTCJul 7, 07:10 UTC5h 0m
2026-07-06 KAL1405 - Jul 6, 08:40 UTCJul 6, 09:25 UTC45m
2026-07-06 KAL116 - Jul 6, 06:05 UTCJul 6, 06:30 UTC25m
2026-07-06 KAL115 - Jul 6, 01:10 UTCJul 6, 01:35 UTC25m
2026-07-05 KAL1402 PUS → ICN Jul 5, 22:00 UTCJul 5, 22:50 UTC50m
2026-07-05 KAL1405 - Jul 5, 08:20 UTCJul 5, 09:05 UTC45m
2026-07-05 KAL116 - Jul 5, 05:55 UTCJul 5, 06:20 UTC25m
2026-07-05 KAL115 - Jul 5, 00:50 UTCJul 5, 01:15 UTC25m
2026-07-04 KAL708 - Jul 4, 10:15 UTCJul 4, 12:10 UTC1h 55m
2026-07-04 KAL707 - Jul 4, 06:05 UTCJul 4, 08:25 UTC2h 20m
2026-07-03 KAL1432 TAE → ICN Jul 3, 23:00 UTCJul 3, 23:40 UTC40m
2026-07-03 KAL1431 - Jul 3, 10:10 UTCJul 3, 10:45 UTC35m
2026-07-03 KAL108 - Jul 3, 03:35 UTCJul 3, 08:40 UTC5h 5m
2026-07-02 KAL796 CTS → ICN Jul 2, 11:25 UTCJul 2, 12:20 UTC55m
2026-07-02 KAL795 - Jul 2, 05:45 UTCJul 2, 06:51 UTC1h 6m
2026-07-01 KAL1432 TAE → ICN Jul 1, 22:55 UTCJul 1, 23:40 UTC45m
2026-07-01 KAL1431 - Jul 1, 10:35 UTCJul 1, 11:05 UTC30m
2026-07-01 KAL107 - Jul 1, 03:35 UTCJul 1, 08:55 UTC5h 20m
2026-06-30 KAL620 - Jun 30, 19:30 UTCJun 30, 22:55 UTC3h 25m
2026-06-30 KAL619 - Jun 30, 13:50 UTCJun 30, 17:20 UTC3h 30m
2026-06-29 KAL1432 TAE → ICN Jun 29, 22:59 UTCJun 29, 23:25 UTC25m
2026-06-29 KAL1431 - Jun 29, 10:15 UTCJun 29, 10:50 UTC35m
2026-06-29 KAL107 - Jun 29, 03:34 UTCJun 29, 08:44 UTC5h 10m
2026-06-28 KAL620 - Jun 28, 19:55 UTCJun 28, 23:29 UTC3h 35m
2026-06-28 KAL619 - Jun 28, 13:49 UTCJun 28, 17:30 UTC3h 40m
2026-06-28 KAL126 - Jun 28, 06:05 UTCJun 28, 08:19 UTC2h 15m
2026-06-28 KAL125 - Jun 28, 01:44 UTCJun 28, 02:20 UTC35m
2026-06-27 KAL1404 - Jun 27, 23:10 UTCJun 27, 23:55 UTC45m
2026-06-27 KAL1409 - Jun 27, 11:00 UTCJun 27, 11:44 UTC45m
2026-06-27 KAL134 - Jun 27, 04:29 UTCJun 27, 04:49 UTC20m
2026-06-26 KAL133 - Jun 26, 23:25 UTCJun 26, 23:39 UTC15m
2026-06-26 KAL108 - Jun 26, 03:24 UTCJun 26, 08:45 UTC5h 20m
2026-06-25 KAL1432 TAE → ICN Jun 25, 22:59 UTCJun 25, 23:24 UTC25m

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 1d ago.
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 KAL2134, KAL2133, KAL1432, KAL1431, KAL1402.