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 1d ago
Flights observed
162
Distinct callsigns
20
Country
KR
Last broadcast
1d 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
TWB328 - 7 2026-06-17
TWB327 - 7 2026-06-17
TWB226 - 7 2026-06-17
TWB225 - 7 2026-06-17
TWB736 - 6 2026-06-12
TWB735 Tway Airlines 6 2026-06-12
TWB728 Tway Airlines 6 2026-06-12
TWB688 Tway Airlines 6 2026-06-10
TWB687 Tway Airlines 6 2026-06-10
TWB725 - 4 2026-06-07
TWB715 Tway Airlines 4 2026-05-30
TWB707 Tway Airlines 4 2026-06-07
TWB808 Tway Airlines 3 2026-05-24
TWB720 Tway Airlines 3 2026-06-05
TWB710 Tway Airlines 3 2026-05-26
TWB702 Tway Airlines 3 2026-06-06
TWB668 Tway Airlines 3 2026-05-20
TWB667 Tway Airlines 3 2026-05-20
TWB664 Tway Airlines 3 2026-05-16
TWB252 Tway Airlines 3 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 TWB208 - Jun 25, 11:44 UTCJun 25, 12:44 UTC1h 0m
2026-06-25 TWB207 - Jun 25, 09:25 UTCJun 25, 10:09 UTC45m
2026-06-25 TWB244 - Jun 25, 07:25 UTCJun 25, 07:59 UTC35m
2026-06-25 TWB244 - Jun 25, 05:50 UTCJun 25, 06:55 UTC1h 5m
2026-06-25 TWB243 - Jun 25, 01:44 UTCJun 25, 03:34 UTC1h 50m
2026-06-24 TWB244 NRT → ICN Jun 24, 05:34 UTCJun 24, 07:44 UTC2h 10m
2026-06-24 TWB243 - Jun 24, 01:39 UTCJun 24, 03:29 UTC1h 50m
2026-06-22 TWB281 - Jun 22, 02:14 UTCJun 22, 07:54 UTC5h 40m
2026-06-21 TWB672 KHH → ICN Jun 21, 08:25 UTCJun 21, 10:54 UTC2h 30m
2026-06-21 TWB671 - Jun 21, 04:20 UTCJun 21, 06:50 UTC2h 30m
2026-06-21 TWB288 - Jun 21, 01:45 UTCJun 21, 02:40 UTC55m
2026-06-20 TWB287 - Jun 20, 23:04 UTCJun 20, 23:59 UTC55m
2026-06-20 TWB206 - Jun 20, 08:34 UTCJun 20, 09:34 UTC1h 0m
2026-06-20 TWB205 - Jun 20, 06:14 UTCJun 20, 07:00 UTC45m
2026-06-20 TWB288 - Jun 20, 01:55 UTCJun 20, 02:54 UTC1h 0m
2026-06-19 TWB287 - Jun 19, 23:09 UTCJun 19, 23:54 UTC45m
2026-06-19 TWB306 KIX → ICN Jun 19, 10:59 UTCJun 19, 12:14 UTC1h 15m
2026-06-19 TWB313 - Jun 19, 08:09 UTCJun 19, 08:59 UTC50m
2026-06-19 TWB214 - Jun 19, 05:59 UTCJun 19, 06:39 UTC40m
2026-06-19 TWB227 CJU → FUK Jun 19, 04:04 UTCJun 19, 04:14 UTC10m
2026-06-19 TWB809 - Jun 19, 01:29 UTCJun 19, 01:45 UTC15m
2026-06-18 TWB876 - Jun 18, 23:55 UTCJun 19, 00:20 UTC24m
2026-06-18 TWB873 - Jun 18, 21:15 UTCJun 18, 21:30 UTC15m
2026-06-18 TWB810 - Jun 18, 10:45 UTCJun 18, 10:55 UTC10m
2026-06-18 TWB690 - Jun 18, 05:50 UTCJun 18, 06:30 UTC40m
2026-06-18 TWB689 - Jun 18, 03:15 UTCJun 18, 04:05 UTC50m
2026-06-17 TWB843 - Jun 17, 23:55 UTCJun 18, 00:20 UTC25m
2026-06-17 TWB226 - Jun 17, 10:25 UTCJun 17, 11:10 UTC45m
2026-06-17 TWB225 - Jun 17, 08:15 UTCJun 17, 08:50 UTC35m
2026-06-17 TWB328 - Jun 17, 05:15 UTCJun 17, 06:20 UTC1h 5m
2026-06-17 TWB327 - Jun 17, 02:20 UTCJun 17, 03:35 UTC1h 15m
2026-06-16 TWB226 - Jun 16, 10:25 UTCJun 16, 11:10 UTC45m
2026-06-16 TWB225 - Jun 16, 08:05 UTCJun 16, 08:35 UTC30m
2026-06-16 TWB328 - Jun 16, 05:05 UTCJun 16, 06:20 UTC1h 15m
2026-06-16 TWB327 - Jun 16, 02:04 UTCJun 16, 03:15 UTC1h 10m
2026-06-15 TWB226 FUK → CJJ Jun 15, 10:15 UTCJun 15, 11:05 UTC50m
2026-06-15 TWB225 - Jun 15, 08:04 UTCJun 15, 08:35 UTC30m
2026-06-15 TWB328 - Jun 15, 04:55 UTCJun 15, 06:00 UTC1h 5m
2026-06-15 TWB327 - Jun 15, 02:15 UTCJun 15, 03:30 UTC1h 15m
2026-06-14 TWB226 FUK → CJJ Jun 14, 11:35 UTCJun 14, 12:20 UTC45m
2026-06-14 TWB225 CJJ → FUK Jun 14, 09:20 UTCJun 14, 09:55 UTC35m
2026-06-14 TWB328 KIX → CJJ Jun 14, 05:00 UTCJun 14, 06:15 UTC1h 15m
2026-06-14 TWB327 - Jun 14, 02:00 UTCJun 14, 03:15 UTC1h 15m
2026-06-13 TWB860 - Jun 13, 13:10 UTCJun 13, 13:35 UTC25m
2026-06-13 TWB859 - Jun 13, 11:05 UTCJun 13, 11:30 UTC25m
2026-06-13 TWB844 CJU → CJJ Jun 13, 09:30 UTCJun 13, 10:00 UTC30m
2026-06-13 TWB945 - Jun 13, 07:40 UTCJun 13, 07:50 UTC10m
2026-06-13 TWB946 - Jun 13, 06:30 UTCJun 13, 06:40 UTC10m
2026-06-13 TWB713 GMP → CJU Jun 13, 03:35 UTCJun 13, 04:10 UTC35m
2026-06-13 TWB706 - Jun 13, 00:15 UTCJun 13, 01:00 UTC45m

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 1d 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 TWB328, TWB327, TWB226, TWB225, TWB736.