Apparatus

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sensors Mode-S transponder

71C327

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

Currently assigned to HL8327 · BOEING 737-800

Hex
71C327
Octal
34341447
Decimal
7,455,527
Country
KR
Tail
HL8327
Type
B738
No current signal · last broadcast 3h ago
Flights observed
181
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 71C327.

Country allocation

The ICAO 24-bit address 71C327 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 Tway Airlines 6 2026-04-20
TWB675 Tway Airlines 5 2026-05-25
TWB126 Tway Airlines 5 2026-05-13
TWB125 Tway Airlines 5 2026-05-12
TWB670 Tway Airlines 4 2026-05-11
TWB663 Tway Airlines 4 2026-05-28
TWB327 Tway Airlines 4 2026-04-20
TWB907 Tway Airlines 3 2026-05-07
TWB906 Tway Airlines 3 2026-05-07
TWB734 - 3 2026-05-23
TWB733 - 3 2026-05-23
TWB727 Tway Airlines 3 2026-05-28
TWB718 Tway Airlines 3 2026-05-24
TWB717 Tway Airlines 3 2026-05-24
TWB701 Tway Airlines 3 2026-05-23
TWB669 Tway Airlines 3 2026-05-11
TWB664 Tway Airlines 3 2026-05-28
TWB651 Tway Airlines 3 2026-04-15
TWB331 Tway Airlines 3 2026-05-24
TWB322 Tway Airlines 3 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 TWB215 TAE → FUK May 30, 08:20 UTCMay 30, 08:30 UTC10m
2026-05-30 TWB252 NRT → TAE May 30, 05:05 UTCMay 30, 06:20 UTC1h 15m
2026-05-30 TWB251 TAE → NRT May 30, 01:45 UTCMay 30, 03:15 UTC1h 30m
2026-05-28 TWB664 TPE → TAE May 28, 18:10 UTCMay 28, 18:30 UTC20m
2026-05-28 TWB663 TAE → TPE May 28, 15:45 UTCMay 28, 16:10 UTC25m
2026-05-28 TWB663 TAE → TPE May 28, 14:15 UTCMay 28, 14:25 UTC10m
2026-05-28 TWB727 GMP → CJU May 28, 08:25 UTCMay 28, 08:50 UTC25m
2026-05-28 TWB752 - May 28, 04:40 UTCMay 28, 05:10 UTC30m
2026-05-27 TWB810 CJU → TAE May 27, 10:55 UTCMay 27, 11:05 UTC10m
2026-05-27 TWB727 GMP → CJU May 27, 08:30 UTCMay 27, 08:55 UTC25m
2026-05-27 TWB722 CJU → GMP May 27, 06:40 UTCMay 27, 07:15 UTC36m
2026-05-27 TWB332 KIX → CJU May 27, 03:20 UTCMay 27, 03:54 UTC35m
2026-05-27 TWB319 PUS → KIX May 27, 00:59 UTCMay 27, 01:34 UTC35m
2026-05-26 TWB322 KIX → PUS May 26, 06:49 UTCMay 26, 07:19 UTC30m
2026-05-26 TWB321 PUS → KIX May 26, 04:24 UTCMay 26, 05:15 UTC50m
2026-05-25 TWB676 KHH → PUS May 25, 09:55 UTCMay 25, 10:40 UTC45m
2026-05-25 TWB675 PUS → KHH May 25, 07:20 UTCMay 25, 08:25 UTC1h 5m
2026-05-24 TWB041 PUS → CXR May 24, 10:15 UTCMay 24, 21:15 UTC11h 0m
2026-05-24 TWB331 CJU → KIX May 24, 08:00 UTCMay 24, 08:45 UTC45m
2026-05-24 TWB717 GMP → CJU May 24, 05:10 UTCMay 24, 05:35 UTC25m
2026-05-24 TWB718 CJU → GMP May 24, 03:40 UTCMay 24, 04:05 UTC25m
2026-05-24 TWB804 CJU → TAE May 24, 00:10 UTCMay 24, 00:25 UTC15m
2026-05-23 TWB701 GMP → CJU May 23, 21:40 UTCMay 23, 22:00 UTC20m
2026-05-23 TWB734 - May 23, 12:05 UTCMay 23, 12:35 UTC30m
2026-05-23 TWB733 - May 23, 09:50 UTCMay 23, 10:15 UTC25m
2026-05-23 TWB726 CJU → GMP May 23, 08:10 UTCMay 23, 08:40 UTC30m
2026-05-23 TWB721 GMP → CJU May 23, 05:45 UTCMay 23, 06:05 UTC20m
2026-05-23 TWB716 CJU → GMP May 23, 03:55 UTCMay 23, 04:45 UTC50m
2026-05-23 TWB709 GMP → CJU May 23, 01:35 UTCMay 23, 02:05 UTC30m
2026-05-22 TWB922 PUS → GMP May 22, 23:45 UTCMay 23, 00:20 UTC35m
2026-05-22 TWB236 FUK → PUS May 22, 11:20 UTCMay 22, 11:35 UTC15m
2026-05-22 TWB322 KIX → PUS May 22, 06:35 UTCMay 22, 07:10 UTC35m
2026-05-22 TWB321 PUS → KIX May 22, 04:20 UTCMay 22, 05:00 UTC40m
2026-05-22 TWB231 PUS → FUK May 22, 00:50 UTCMay 22, 01:05 UTC15m
2026-05-21 TWB676 KHH → PUS May 21, 10:00 UTCMay 21, 10:40 UTC40m
2026-05-21 TWB675 PUS → KHH May 21, 07:55 UTCMay 21, 08:50 UTC55m
2026-05-20 TWB675 PUS → KHH May 20, 09:50 UTCMay 21, 08:50 UTC23h 0m
2026-05-20 TWB256 NRT → PUS May 20, 03:10 UTCMay 20, 08:30 UTC5h 21m
2026-05-19 TWB255 PUS → NRT May 19, 09:40 UTCMay 20, 01:10 UTC15h 30m
2026-05-19 TWB675 PUS → KHH May 19, 07:35 UTCMay 19, 08:25 UTC50m
2026-05-18 TWB675 PUS → KHH May 18, 10:10 UTCMay 19, 08:25 UTC22h 14m
2026-05-18 TWB331 CJU → KIX May 18, 07:55 UTCMay 18, 08:50 UTC55m
2026-05-18 TWB717 GMP → CJU May 18, 05:20 UTCMay 18, 05:50 UTC30m
2026-05-18 TWB718 CJU → GMP May 18, 03:50 UTCMay 18, 04:20 UTC30m
2026-05-18 TWB802 CJU → TAE May 18, 00:05 UTCMay 18, 00:15 UTC10m
2026-05-17 TWB701 GMP → CJU May 17, 21:35 UTCMay 17, 22:01 UTC25m
2026-05-17 TWB736 - May 17, 12:35 UTCMay 17, 13:05 UTC30m
2026-05-17 TWB735 GMP → CJU May 17, 10:10 UTCMay 17, 10:35 UTC25m
2026-05-17 TWB728 CJU → GMP May 17, 08:40 UTCMay 17, 09:10 UTC30m
2026-05-16 TWB688 TPE → CJU May 16, 07:11 UTCMay 16, 07:31 UTC20m

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 HL8327 page for operator, model, and routing details .

Mode-S 71C327 frequently asked

What is Mode-S code 71C327?
71C327 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8327.
Where is Mode-S 71C327 registered?
Mode-S code 71C327 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 71C327 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C327, octal 34341447, decimal 7,455,527.
What flights does 71C327 operate?
Mode-S 71C327 has broadcast 20 distinct callsigns, including TWB328, TWB675, TWB126, TWB125, TWB670.