Apparatus

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sensors Mode-S transponder

71C300

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

Currently assigned to HL8300 · BOEING 737-800

Hex
71C300
Octal
34341400
Decimal
7,455,488
Country
KR
Tail
HL8300
Type
B738
No current signal · last broadcast 37m ago
Flights observed
175
Distinct callsigns
20
Country
KR
Last broadcast
37m ago

Last known position

Most recent position reported by Mode-S 71C300.

Country allocation

The ICAO 24-bit address 71C300 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
TWB126 Tway Airlines 13 2026-05-28
TWB125 Tway Airlines 10 2026-05-27
TWB669 Tway Airlines 8 2026-05-23
TWB670 Tway Airlines 7 2026-05-23
TWB287 Tway Airlines 6 2026-05-22
TWB243 Tway Airlines 6 2026-05-27
TWB288 Tway Airlines 5 2026-05-23
TWB244 Tway Airlines 5 2026-05-27
TWB672 Tway Airlines 4 2026-05-20
TWB286 Tway Airlines 4 2026-05-01
TWB734 - 3 2026-05-15
TWB733 - 3 2026-05-15
TWB671 Tway Airlines 3 2026-05-20
TWB667 Tway Airlines 3 2026-05-15
TWB664 Tway Airlines 3 2026-05-29
TWB663 Tway Airlines 3 2026-05-29
TWB354 - 3 2026-05-22
TWB353 - 3 2026-05-22
TWB285 Tway Airlines 3 2026-04-30
TWB014 Tway Airlines 3 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 TWB717 GMP → CJU May 30, 05:20 UTCMay 30, 05:40 UTC20m
2026-05-30 TWB710 CJU → GMP May 30, 02:00 UTCMay 30, 02:40 UTC40m
2026-05-29 TWB664 TPE → TAE May 29, 18:15 UTCMay 29, 18:40 UTC25m
2026-05-29 TWB663 TAE → TPE May 29, 15:10 UTCMay 29, 15:45 UTC35m
2026-05-29 TWB663 TAE → TPE May 29, 13:45 UTCMay 29, 13:55 UTC10m
2026-05-29 TWB314 KIX → TAE May 29, 10:45 UTCMay 29, 11:15 UTC30m
2026-05-29 TWB305 ICN → KIX May 29, 07:15 UTCMay 29, 08:30 UTC1h 15m
2026-05-28 TWB126 KLO → ICN May 28, 05:00 UTCMay 28, 08:45 UTC3h 45m
2026-05-27 TWB125 ICN → KLO May 27, 23:45 UTCMay 28, 03:25 UTC3h 40m
2026-05-27 TWB244 NRT → ICN May 27, 05:40 UTCMay 27, 07:50 UTC2h 11m
2026-05-27 TWB243 ICN → NRT May 27, 01:49 UTCMay 27, 03:50 UTC2h 0m
2026-05-26 TWB034 CXR → ICN May 26, 10:34 UTCMay 26, 21:34 UTC11h 0m
2026-05-26 TWB244 NRT → ICN May 26, 06:10 UTCMay 26, 08:04 UTC1h 55m
2026-05-26 TWB243 ICN → NRT May 26, 01:44 UTCMay 26, 03:40 UTC1h 55m
2026-05-25 TWB013 ICN → DAD May 25, 13:00 UTCMay 26, 00:00 UTC10h 59m
2026-05-25 TWB126 KLO → ICN May 25, 05:25 UTCMay 25, 09:15 UTC3h 50m
2026-05-25 TWB125 ICN → KLO May 25, 02:50 UTCMay 25, 03:35 UTC45m
2026-05-23 TWB670 RMQ → ICN May 23, 10:50 UTCMay 23, 11:25 UTC35m
2026-05-23 TWB670 RMQ → ICN May 23, 09:05 UTCMay 23, 09:40 UTC35m
2026-05-23 TWB669 ICN → RMQ May 23, 05:30 UTCMay 23, 07:40 UTC2h 10m
2026-05-23 TWB288 KMJ → ICN May 23, 01:40 UTCMay 23, 02:50 UTC1h 9m
2026-05-22 TWB287 ICN → KMJ May 22, 23:05 UTCMay 23, 00:15 UTC1h 10m
2026-05-22 TWB208 FUK → ICN May 22, 11:50 UTCMay 22, 12:45 UTC55m
2026-05-22 TWB207 ICN → FUK May 22, 09:15 UTCMay 22, 09:45 UTC30m
2026-05-22 TWB354 - May 22, 05:30 UTCMay 22, 07:00 UTC1h 30m
2026-05-22 TWB353 - May 22, 02:20 UTCMay 22, 03:30 UTC1h 10m
2026-05-22 TWB353 ICN → ICN May 22, 02:05 UTCMay 22, 02:10 UTC5m
2026-05-21 TWB014 DAD → ICN May 21, 13:01 UTCMay 21, 22:55 UTC9h 55m
2026-05-21 TWB670 RMQ → ICN May 21, 09:05 UTCMay 21, 11:20 UTC2h 15m
2026-05-21 TWB669 ICN → RMQ May 21, 07:00 UTCMay 21, 07:25 UTC25m
2026-05-21 TWB669 ICN → RMQ May 21, 05:10 UTCMay 21, 05:35 UTC25m
2026-05-21 TWB288 KMJ → ICN May 21, 01:40 UTCMay 21, 02:40 UTC1h 0m
2026-05-20 TWB287 ICN → KMJ May 20, 23:20 UTCMay 21, 00:20 UTC1h 0m
2026-05-20 TWB672 KHH → ICN May 20, 10:20 UTCMay 20, 10:55 UTC35m
2026-05-20 TWB672 KHH → ICN May 20, 08:25 UTCMay 20, 09:05 UTC40m
2026-05-20 TWB671 ICN → KHH May 20, 04:35 UTCMay 20, 07:10 UTC2h 36m
2026-05-20 TWB288 KMJ → ICN May 20, 01:40 UTCMay 20, 02:40 UTC1h 0m
2026-05-19 TWB287 ICN → KMJ May 19, 23:10 UTCMay 20, 00:10 UTC1h 0m
2026-05-19 TWB126 KLO → ICN May 19, 05:05 UTCMay 19, 08:55 UTC3h 50m
2026-05-18 TWB125 ICN → KLO May 18, 23:50 UTCMay 19, 03:25 UTC3h 35m
2026-05-18 TWB244 NRT → ICN May 18, 05:45 UTCMay 18, 07:35 UTC1h 50m
2026-05-18 TWB243 ICN → NRT May 18, 01:45 UTCMay 18, 03:45 UTC2h 0m
2026-05-17 TWB014 DAD → ICN May 17, 13:50 UTCMay 17, 22:45 UTC8h 55m
2026-05-17 TWB727 GMP → CJU May 17, 08:20 UTCMay 17, 08:45 UTC25m
2026-05-17 TWB722 CJU → GMP May 17, 06:35 UTCMay 17, 07:05 UTC30m
2026-05-17 TWB332 KIX → CJU May 17, 03:15 UTCMay 17, 03:45 UTC30m
2026-05-16 TWB042 CXR → PUS May 16, 10:05 UTCMay 17, 01:40 UTC15h 35m
2026-05-16 TWB331 CJU → KIX May 16, 07:45 UTCMay 16, 08:41 UTC55m
2026-05-16 TWB717 GMP → CJU May 16, 05:10 UTCMay 16, 05:30 UTC20m
2026-05-16 TWB718 CJU → GMP May 16, 03:35 UTCMay 16, 04:05 UTC30m

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 HL8300 page for operator, model, and routing details .

Mode-S 71C300 frequently asked

What is Mode-S code 71C300?
71C300 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8300.
Where is Mode-S 71C300 registered?
Mode-S code 71C300 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 71C300 broadcasting right now?
No active broadcast right now. Last signal was 37m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C300, octal 34341400, decimal 7,455,488.
What flights does 71C300 operate?
Mode-S 71C300 has broadcast 20 distinct callsigns, including TWB126, TWB125, TWB669, TWB670, TWB287.