Apparatus

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sensors Mode-S transponder

71C323

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

Currently assigned to HL8323 · BOEING 737-800

Hex
71C323
Octal
34341443
Decimal
7,455,523
Country
KR
Tail
HL8323
Type
B738
No current signal · last broadcast 4h ago
Flights observed
238
Distinct callsigns
20
Country
KR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 71C323.

Country allocation

The ICAO 24-bit address 71C323 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
TWB671 - 11 2026-07-08
TWB643 - 10 2026-07-02
TWB672 - 9 2026-07-08
TWB243 Tway Airlines 8 2026-05-22
TWB683 - 7 2026-07-14
TWB682 Tway Airlines 7 2026-06-14
TWB644 - 7 2026-07-02
TWB034 - 7 2026-07-01
TWB314 - 6 2026-07-11
TWB305 - 6 2026-07-11
TWB251 - 6 2026-06-13
TWB670 - 5 2026-07-07
TWB669 - 5 2026-07-07
TWB313 - 5 2026-06-27
TWB306 - 5 2026-06-27
TWB288 - 5 2026-07-04
TWB287 - 5 2026-07-03
TWB264 Tway Airlines 5 2026-05-08
TWB263 Tway Airlines 5 2026-05-08
TWB252 Tway Airlines 5 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB683 - Jul 14, 02:15 UTCJul 14, 02:55 UTC40m
2026-07-12 TWB312 - Jul 12, 02:01 UTCJul 12, 02:35 UTC35m
2026-07-11 TWB311 - Jul 11, 23:10 UTCJul 12, 00:10 UTC1h 0m
2026-07-11 TWB314 - Jul 11, 10:45 UTCJul 11, 11:15 UTC30m
2026-07-11 TWB305 - Jul 11, 07:10 UTCJul 11, 08:35 UTC1h 25m
2026-07-08 TWB672 KHH → ICN Jul 8, 10:00 UTCJul 8, 12:30 UTC2h 30m
2026-07-08 TWB671 ICN → KHH Jul 8, 06:10 UTCJul 8, 08:45 UTC2h 35m
2026-07-07 TWB616 - Jul 7, 19:15 UTCJul 7, 19:35 UTC20m
2026-07-07 TWB615 - Jul 7, 13:40 UTCJul 7, 14:05 UTC25m
2026-07-07 TWB670 RMQ → ICN Jul 7, 09:00 UTCJul 7, 11:05 UTC2h 5m
2026-07-07 TWB669 - Jul 7, 05:10 UTCJul 7, 07:20 UTC2h 10m
2026-07-05 TWB672 KHH → ICN Jul 5, 08:15 UTCJul 5, 10:45 UTC2h 30m
2026-07-05 TWB671 ICN → KHH Jul 5, 04:35 UTCJul 5, 07:05 UTC2h 30m
2026-07-04 TWB013 ICN → ICN Jul 4, 13:00 UTCJul 4, 23:45 UTC10h 45m
2026-07-04 TWB672 KHH → ICN Jul 4, 08:10 UTCJul 4, 10:40 UTC2h 30m
2026-07-04 TWB671 ICN → KHH Jul 4, 04:25 UTCJul 4, 06:55 UTC2h 30m
2026-07-04 TWB288 - Jul 4, 01:30 UTCJul 4, 02:40 UTC1h 10m
2026-07-03 TWB287 - Jul 3, 22:55 UTCJul 3, 23:55 UTC1h 0m
2026-07-02 TWB644 HKG → ICN Jul 2, 05:25 UTCJul 2, 08:40 UTC3h 15m
2026-07-02 TWB643 - Jul 2, 02:55 UTCJul 2, 03:15 UTC20m
2026-07-02 TWB643 - Jul 2, 00:10 UTCJul 2, 02:25 UTC2h 15m
2026-07-01 TWB034 ICN → ICN Jul 1, 11:00 UTCJul 1, 21:40 UTC10h 40m
2026-07-01 TWB644 HKG → ICN Jul 1, 05:35 UTCJul 1, 08:45 UTC3h 10m
2026-07-01 TWB643 ICN → HKG Jul 1, 00:20 UTCJul 1, 03:30 UTC3h 10m
2026-06-30 TWB034 ICN → ICN Jun 30, 10:50 UTCJun 30, 21:50 UTC11h 0m
2026-06-28 TWB644 HKG → ICN Jun 28, 06:20 UTCJun 28, 09:20 UTC3h 0m
2026-06-28 TWB643 - Jun 28, 03:00 UTCJun 28, 03:19 UTC20m
2026-06-28 TWB643 - Jun 28, 00:09 UTCJun 28, 02:25 UTC2h 15m
2026-06-27 TWB306 - Jun 27, 10:54 UTCJun 27, 12:19 UTC1h 25m
2026-06-27 TWB313 - Jun 27, 08:14 UTCJun 27, 08:55 UTC40m
2026-06-27 TWB214 - Jun 27, 06:09 UTCJun 27, 06:40 UTC30m
2026-06-27 TWB227 - Jun 27, 03:49 UTCJun 27, 04:24 UTC35m
2026-06-27 TWB707 - Jun 27, 01:00 UTCJun 27, 01:39 UTC40m
2026-06-26 TWB702 - Jun 26, 23:19 UTCJun 27, 00:00 UTC40m
2026-06-26 TWB761 - Jun 26, 11:40 UTCJun 26, 12:14 UTC35m
2026-06-26 TWB652 KHH → GMP Jun 26, 05:39 UTCJun 26, 08:05 UTC2h 25m
2026-06-26 TWB651 GMP → KHH Jun 26, 02:09 UTCJun 26, 04:30 UTC2h 20m
2026-06-25 TWB922 PUS → GMP Jun 25, 21:44 UTCJun 25, 22:24 UTC40m
2026-06-25 TWB236 - Jun 25, 11:30 UTCJun 25, 11:59 UTC30m
2026-06-25 TWB235 - Jun 25, 09:10 UTCJun 25, 09:29 UTC20m
2026-06-25 TWB3001 - Jun 25, 07:49 UTCJun 25, 08:04 UTC15m
2026-06-23 TWB683 - Jun 23, 02:24 UTCJun 23, 09:14 UTC6h 50m
2026-06-21 TWB683 - Jun 21, 02:15 UTCJun 21, 08:04 UTC5h 50m
2026-06-20 TWB808 - Jun 20, 09:54 UTCJun 20, 10:09 UTC15m
2026-06-19 TWB689 - Jun 19, 23:49 UTCJun 20, 04:20 UTC4h 30m
2026-06-19 TWB808 - Jun 19, 09:55 UTCJun 19, 10:19 UTC25m
2026-06-19 TWB945 - Jun 19, 07:45 UTCJun 19, 07:54 UTC10m
2026-06-19 TWB946 - Jun 19, 06:29 UTCJun 19, 06:44 UTC15m
2026-06-19 TWB785 - Jun 19, 04:10 UTCJun 19, 04:44 UTC35m
2026-06-19 TWB786 - Jun 19, 01:59 UTCJun 19, 02:39 UTC40m

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 HL8323 page for operator, model, and routing details .

Mode-S 71C323 frequently asked

What is Mode-S code 71C323?
71C323 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8323.
Where is Mode-S 71C323 registered?
Mode-S code 71C323 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 71C323 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C323, octal 34341443, decimal 7,455,523.
What flights does 71C323 operate?
Mode-S 71C323 has broadcast 20 distinct callsigns, including TWB671, TWB643, TWB672, TWB243, TWB683.