Apparatus

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sensors Mode-S transponder

71C378

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

Currently assigned to HL8378 · BOEING 737-800

Hex
71C378
Octal
34341570
Decimal
7,455,608
Country
KR
Tail
HL8378
Type
B738
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
487
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S 71C378.

Country allocation

The ICAO 24-bit address 71C378 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
TWB639 Tway Airlines 12 2026-07-23
TWB728 Tway Airlines 10 2026-07-20
TWB706 - 10 2026-07-26
TWB640 Tway Airlines 10 2026-07-23
TWB735 Tway Airlines 9 2026-07-20
TWB668 Tway Airlines 9 2026-07-26
TWB922 Tway Airlines 8 2026-07-24
TWB736 - 8 2026-07-20
TWB703 Tway Airlines 8 2026-07-25
TWB676 Tway Airlines 8 2026-07-24
TWB667 Tway Airlines 8 2026-07-26
TWB331 Tway Airlines 8 2026-07-23
TWB322 - 8 2026-07-14
TWB701 Tway Airlines 7 2026-07-20
TWB672 - 7 2026-06-23
TWB320 Tway Airlines 7 2026-07-23
TWB905 Tway Airlines 6 2026-07-20
TWB904 Tway Airlines 6 2026-07-20
TWB850 - 6 2026-07-18
TWB849 - 6 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB9642 - Jul 26, 20:40 UTCJul 26, 21:25 UTC45m
2026-07-26 TWB9642 - Jul 26, 17:55 UTCJul 26, 19:30 UTC1h 35m
2026-07-26 TWB9641 - Jul 26, 15:30 UTCJul 26, 15:40 UTC10m
2026-07-26 TWB9641 - Jul 26, 12:30 UTCJul 26, 14:40 UTC2h 10m
2026-07-26 TWB927 GMP → PUS Jul 26, 10:20 UTCJul 26, 11:00 UTC40m
2026-07-26 TWB668 TSA → GMP Jul 26, 06:00 UTCJul 26, 08:05 UTC2h 6m
2026-07-26 TWB667 GMP → TSA Jul 26, 02:35 UTCJul 26, 04:45 UTC2h 10m
2026-07-26 TWB706 - Jul 26, 00:15 UTCJul 26, 01:00 UTC45m
2026-07-25 TWB703 GMP → CJU Jul 25, 22:10 UTCJul 25, 22:45 UTC35m
2026-07-25 TWB734 - Jul 25, 12:10 UTCJul 25, 12:55 UTC45m
2026-07-25 TWB733 - Jul 25, 10:00 UTCJul 25, 10:35 UTC35m
2026-07-25 TWB726 CJU → GMP Jul 25, 08:05 UTCJul 25, 08:50 UTC45m
2026-07-25 TWB721 GMP → CJU Jul 25, 05:40 UTCJul 25, 06:15 UTC35m
2026-07-25 TWB716 CJU → GMP Jul 25, 03:55 UTCJul 25, 04:35 UTC40m
2026-07-25 TWB709 GMP → CJU Jul 25, 01:35 UTCJul 25, 02:05 UTC30m
2026-07-24 TWB922 PUS → GMP Jul 24, 23:45 UTCJul 25, 00:25 UTC40m
2026-07-24 TWB676 KHH → PUS Jul 24, 09:45 UTCJul 24, 12:00 UTC2h 15m
2026-07-24 TWB675 PUS → KHH Jul 24, 06:10 UTCJul 24, 08:30 UTC2h 20m
2026-07-24 TWB270 CTS → PUS Jul 24, 02:40 UTCJul 24, 04:55 UTC2h 15m
2026-07-23 TWB269 PUS → CTS Jul 23, 23:15 UTCJul 24, 01:30 UTC2h 15m
2026-07-23 TWB640 HKG → PUS Jul 23, 20:40 UTCJul 23, 21:15 UTC35m
2026-07-23 TWB640 HKG → PUS Jul 23, 18:05 UTCJul 23, 19:35 UTC1h 30m
2026-07-23 TWB639 PUS → HKG Jul 23, 13:05 UTCJul 23, 16:05 UTC3h 0m
2026-07-23 TWB320 KIX → PUS Jul 23, 10:40 UTCJul 23, 11:50 UTC1h 10m
2026-07-23 TWB331 CJU → KIX Jul 23, 08:00 UTCJul 23, 09:00 UTC1h 0m
2026-07-23 TWB717 GMP → CJU Jul 23, 05:15 UTCJul 23, 05:50 UTC35m
2026-07-22 TWB651 GMP → KHH Jul 22, 02:05 UTCJul 22, 04:40 UTC2h 35m
2026-07-21 TWB922 PUS → GMP Jul 21, 21:45 UTCJul 21, 22:35 UTC50m
2026-07-21 TWB320 KIX → PUS Jul 21, 11:15 UTCJul 21, 12:30 UTC1h 15m
2026-07-21 TWB331 CJU → KIX Jul 21, 08:35 UTCJul 21, 09:40 UTC1h 5m
2026-07-21 TWB717 - Jul 21, 05:40 UTCJul 21, 06:20 UTC40m
2026-07-21 TWB718 - Jul 21, 03:40 UTCJul 21, 04:20 UTC40m
2026-07-21 TWB809 - Jul 21, 01:25 UTCJul 21, 01:35 UTC10m
2026-07-20 TWB804 CJU → TAE Jul 20, 23:55 UTCJul 21, 00:20 UTC25m
2026-07-20 TWB701 GMP → CJU Jul 20, 21:40 UTCJul 20, 22:15 UTC35m
2026-07-20 TWB736 - Jul 20, 13:10 UTCJul 20, 13:50 UTC40m
2026-07-20 TWB735 GMP → CJU Jul 20, 10:50 UTCJul 20, 11:25 UTC35m
2026-07-20 TWB728 CJU → GMP Jul 20, 08:50 UTCJul 20, 09:30 UTC40m
2026-07-20 TWB905 KWJ → CJU Jul 20, 06:35 UTCJul 20, 06:45 UTC10m
2026-07-20 TWB904 CJU → KWJ Jul 20, 05:15 UTCJul 20, 05:30 UTC15m
2026-07-20 TWB903 KWJ → CJU Jul 20, 03:10 UTCJul 20, 03:20 UTC10m
2026-07-20 TWB902 CJU → KWJ Jul 20, 02:00 UTCJul 20, 02:20 UTC20m
2026-07-19 TWB901 - Jul 19, 23:55 UTCJul 20, 00:05 UTC10m
2026-07-19 TWB908 CJU → KWJ Jul 19, 10:25 UTCJul 19, 10:40 UTC15m
2026-07-19 TWB863 CJJ → CJU Jul 19, 06:50 UTCJul 19, 07:20 UTC30m
2026-07-18 TWB850 - Jul 18, 13:30 UTCJul 18, 14:00 UTC30m
2026-07-18 TWB849 - Jul 18, 11:30 UTCJul 18, 11:55 UTC25m
2026-07-18 TWB844 - Jul 18, 09:50 UTCJul 18, 10:15 UTC25m
2026-07-18 TWB907 - Jul 18, 08:00 UTCJul 18, 08:15 UTC15m
2026-07-18 TWB906 - Jul 18, 06:50 UTCJul 18, 07:05 UTC15m

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 HL8378 page for operator, model, and routing details .

Mode-S 71C378 frequently asked

What is Mode-S code 71C378?
71C378 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8378.
Where is Mode-S 71C378 registered?
Mode-S code 71C378 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 71C378 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C378, octal 34341570, decimal 7,455,608.
What flights does 71C378 operate?
Mode-S 71C378 has broadcast 20 distinct callsigns, including TWB639, TWB728, TWB706, TWB640, TWB735.