Apparatus

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sensors Mode-S transponder

71C235

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

Currently assigned to HL8235 · BOEING 737-800

Hex
71C235
Octal
34341065
Decimal
7,455,285
Country
KR
Tail
HL8235
Type
B738
No current signal · last broadcast 15d ago
Flights observed
297
Distinct callsigns
20
Country
KR
Last broadcast
15d ago

Last known position

Most recent position reported by Mode-S 71C235.

Country allocation

The ICAO 24-bit address 71C235 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
TWB688 Tway Airlines 12 2026-07-25
TWB687 Tway Airlines 12 2026-07-25
TWB736 - 11 2026-07-26
TWB735 Tway Airlines 11 2026-07-26
TWB728 Tway Airlines 11 2026-07-26
TWB908 Tway Airlines 8 2026-07-25
TWB725 Tway Airlines 8 2026-07-24
TWB807 Tway Airlines 7 2026-07-25
TWB802 Tway Airlines 7 2026-07-24
TWB720 Tway Airlines 7 2026-07-24
TWB707 - 7 2026-07-15
TWB328 - 7 2026-06-17
TWB327 - 7 2026-06-17
TWB226 - 7 2026-06-17
TWB225 - 7 2026-06-17
TWB812 - 6 2026-07-24
TWB806 Tway Airlines 6 2026-07-24
TWB251 - 6 2026-07-05
TWB905 Tway Airlines 5 2026-07-26
TWB904 Tway Airlines 5 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB736 - Jul 26, 12:30 UTCJul 26, 13:05 UTC35m
2026-07-26 TWB735 GMP → CJU Jul 26, 10:15 UTCJul 26, 10:50 UTC35m
2026-07-26 TWB728 CJU → GMP Jul 26, 08:35 UTCJul 26, 09:10 UTC35m
2026-07-26 TWB905 KWJ → CJU Jul 26, 06:35 UTCJul 26, 06:50 UTC15m
2026-07-26 TWB904 CJU → KWJ Jul 26, 05:20 UTCJul 26, 05:30 UTC10m
2026-07-26 TWB903 KWJ → CJU Jul 26, 03:10 UTCJul 26, 03:20 UTC10m
2026-07-26 TWB902 CJU → KWJ Jul 26, 01:50 UTCJul 26, 02:10 UTC20m
2026-07-25 TWB901 KWJ → CJU Jul 25, 23:50 UTCJul 26, 00:00 UTC10m
2026-07-25 TWB908 CJU → KWJ Jul 25, 10:30 UTCJul 25, 10:45 UTC15m
2026-07-25 TWB688 TPE → CJU Jul 25, 06:40 UTCJul 25, 06:55 UTC15m
2026-07-25 TWB687 CJU → TPE Jul 25, 04:40 UTCJul 25, 04:55 UTC15m
2026-07-25 TWB807 TAE → CJU Jul 25, 01:20 UTCJul 25, 01:30 UTC10m
2026-07-24 TWB802 CJU → TAE Jul 24, 23:40 UTCJul 25, 00:00 UTC20m
2026-07-24 TWB803 - Jul 24, 21:45 UTCJul 24, 22:00 UTC15m
2026-07-24 TWB812 - Jul 24, 12:50 UTCJul 24, 13:00 UTC10m
2026-07-24 TWB811 - Jul 24, 10:50 UTCJul 24, 11:05 UTC15m
2026-07-24 TWB806 CJU → TAE Jul 24, 09:20 UTCJul 24, 09:40 UTC20m
2026-07-24 TWB725 GMP → CJU Jul 24, 06:40 UTCJul 24, 07:20 UTC40m
2026-07-24 TWB720 CJU → GMP Jul 24, 04:50 UTCJul 24, 05:35 UTC45m
2026-07-23 TWB901 KWJ → CJU Jul 23, 23:55 UTCJul 24, 00:05 UTC10m
2026-07-23 TWB908 CJU → KWJ Jul 23, 10:30 UTCJul 23, 10:40 UTC10m
2026-07-23 TWB688 TPE → CJU Jul 23, 07:10 UTCJul 23, 07:20 UTC10m
2026-07-23 TWB687 CJU → TPE Jul 23, 05:00 UTCJul 23, 05:40 UTC40m
2026-07-23 TWB807 TAE → CJU Jul 23, 01:20 UTCJul 23, 01:30 UTC10m
2026-07-22 TWB802 CJU → TAE Jul 22, 23:40 UTCJul 23, 00:00 UTC20m
2026-07-22 TWB701 GMP → CJU Jul 22, 21:45 UTCJul 22, 22:15 UTC30m
2026-07-22 TWB736 - Jul 22, 12:30 UTCJul 22, 13:10 UTC40m
2026-07-22 TWB904 CJU → KWJ Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 TWB903 KWJ → CJU Jul 22, 03:10 UTCJul 22, 03:20 UTC10m
2026-07-22 TWB902 CJU → KWJ Jul 22, 01:55 UTCJul 22, 02:05 UTC10m
2026-07-21 TWB908 CJU → KWJ Jul 21, 10:35 UTCJul 21, 10:45 UTC10m
2026-07-21 TWB688 TPE → CJU Jul 21, 07:30 UTCJul 21, 07:40 UTC10m
2026-07-21 TWB687 CJU → TPE Jul 21, 05:15 UTCJul 21, 05:30 UTC15m
2026-07-21 TWB807 - Jul 21, 01:15 UTCJul 21, 01:25 UTC10m
2026-07-20 TWB802 CJU → TAE Jul 20, 23:40 UTCJul 21, 00:05 UTC25m
2026-07-20 TWB803 - Jul 20, 21:40 UTCJul 20, 21:55 UTC15m
2026-07-20 TWB808 - Jul 20, 09:50 UTCJul 20, 10:15 UTC25m
2026-07-20 TWB906 - Jul 20, 06:50 UTCJul 20, 07:05 UTC15m
2026-07-20 TWB761 ICN → KHH Jul 20, 03:35 UTCJul 20, 04:10 UTC35m
2026-07-19 TWB736 - Jul 19, 12:25 UTCJul 19, 13:00 UTC35m
2026-07-19 TWB735 GMP → CJU Jul 19, 10:15 UTCJul 19, 10:50 UTC35m
2026-07-19 TWB728 CJU → GMP Jul 19, 08:35 UTCJul 19, 09:05 UTC30m
2026-07-19 TWB905 KWJ → CJU Jul 19, 06:25 UTCJul 19, 06:35 UTC10m
2026-07-19 TWB904 CJU → KWJ Jul 19, 05:15 UTCJul 19, 05:25 UTC10m
2026-07-19 TWB902 - Jul 19, 01:55 UTCJul 19, 02:05 UTC10m
2026-07-18 TWB908 - Jul 18, 10:25 UTCJul 18, 10:35 UTC10m
2026-07-18 TWB688 - Jul 18, 06:35 UTCJul 18, 06:50 UTC15m
2026-07-18 TWB687 - Jul 18, 04:50 UTCJul 18, 05:05 UTC15m
2026-07-18 TWB807 - Jul 18, 01:15 UTCJul 18, 01:30 UTC15m
2026-07-17 TWB802 CJU → TAE Jul 17, 23:50 UTCJul 18, 00:15 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 HL8235 page for operator, model, and routing details .

Mode-S 71C235 frequently asked

What is Mode-S code 71C235?
71C235 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8235.
Where is Mode-S 71C235 registered?
Mode-S code 71C235 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 71C235 broadcasting right now?
No active broadcast right now. Last signal was 15d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C235, octal 34341065, decimal 7,455,285.
What flights does 71C235 operate?
Mode-S 71C235 has broadcast 20 distinct callsigns, including TWB688, TWB687, TWB736, TWB735, TWB728.