Apparatus

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sensors Mode-S transponder

71C751

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

Currently assigned to HL8751 · BOEING 737 MAX 8

Hex
71C751
Octal
34343521
Decimal
7,456,593
Country
KR
Tail
HL8751
Type
B38M
No current signal · last broadcast Jul 26, 09:35 UTC
Flights observed
354
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 09:35 UTC

Last known position

Most recent position reported by Mode-S 71C751.

Country allocation

The ICAO 24-bit address 71C751 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
TWB282 - 25 2026-07-08
TWB281 - 22 2026-07-08
TWB245 - 18 2026-07-04
TWB206 - 18 2026-07-15
TWB205 - 18 2026-07-15
TWB246 - 16 2026-07-04
TWB007 - 15 2026-06-30
TWB202 - 14 2026-07-15
TWB201 - 14 2026-07-15
TWB304 - 12 2026-07-10
TWB303 - 12 2026-07-10
TWB302 - 12 2026-07-13
TWB055 Tway Airlines 12 2026-05-04
TWB301 - 11 2026-07-12
TWB008 - 11 2026-07-04
TWB013 - 9 2026-07-15
TWB438 Tway Airlines 8 2026-07-16
TWB034 - 7 2026-07-10
TWB033 - 7 2026-07-10
TWB509 Tway Airlines 6 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB743 GMP → CJU Jul 26, 09:00 UTCJul 26, 09:35 UTC35m
2026-07-26 TWB742 - Jul 26, 07:25 UTCJul 26, 08:00 UTC35m
2026-07-26 TWB713 GMP → CJU Jul 26, 03:30 UTCJul 26, 04:05 UTC35m
2026-07-26 TWB708 CJU → GMP Jul 26, 01:25 UTCJul 26, 02:10 UTC45m
2026-07-25 TWB731 GMP → CJU Jul 25, 09:30 UTCJul 25, 10:15 UTC45m
2026-07-25 TWB724 CJU → GMP Jul 25, 07:50 UTCJul 25, 08:30 UTC40m
2026-07-25 TWB723 GMP → CJU Jul 25, 05:20 UTCJul 25, 05:55 UTC35m
2026-07-25 TWB712 CJU → GMP Jul 25, 02:55 UTCJul 25, 03:35 UTC40m
2026-07-25 TWB835 CJJ → CJU Jul 25, 00:25 UTCJul 25, 00:55 UTC30m
2026-07-24 TWB026 DAD → CJJ Jul 24, 12:30 UTCJul 24, 22:25 UTC9h 55m
2026-07-24 TWB840 - Jul 24, 10:20 UTCJul 24, 10:50 UTC30m
2026-07-24 TWB839 CJJ → CJU Jul 24, 08:10 UTCJul 24, 08:45 UTC35m
2026-07-24 TWB838 CJU → CJJ Jul 24, 06:15 UTCJul 24, 06:45 UTC30m
2026-07-24 TWB713 GMP → CJU Jul 24, 03:25 UTCJul 24, 04:00 UTC35m
2026-07-24 TWB708 CJU → GMP Jul 24, 01:25 UTCJul 24, 02:05 UTC40m
2026-07-23 TWB705 GMP → CJU Jul 23, 23:05 UTCJul 23, 23:50 UTC45m
2026-07-23 TWB732 - Jul 23, 11:45 UTCJul 23, 12:25 UTC40m
2026-07-23 TWB743 GMP → CJU Jul 23, 09:15 UTCJul 23, 09:50 UTC35m
2026-07-23 TWB742 - Jul 23, 07:35 UTCJul 23, 08:15 UTC40m
2026-07-23 TWB715 GMP → CJU Jul 23, 04:25 UTCJul 23, 05:00 UTC35m
2026-07-23 TWB710 CJU → GMP Jul 23, 02:05 UTCJul 23, 02:45 UTC40m
2026-07-23 TWB805 TAE → CJU Jul 23, 00:00 UTCJul 23, 00:20 UTC20m
2026-07-22 TWB510 GUM → KIX Jul 22, 11:55 UTCJul 22, 13:00 UTC1h 5m
2026-07-22 TWB509 KIX → GUM Jul 22, 02:00 UTCJul 22, 02:15 UTC15m
2026-07-21 TWB509 KIX → GUM Jul 21, 23:25 UTCJul 22, 00:05 UTC40m
2026-07-21 TWB510 GUM → KIX Jul 21, 11:40 UTCJul 21, 12:45 UTC1h 5m
2026-07-21 TWB510 GUM → KIX Jul 21, 09:35 UTCJul 21, 10:00 UTC25m
2026-07-21 TWB509 KIX → GUM Jul 21, 02:05 UTCJul 21, 02:15 UTC10m
2026-07-20 TWB509 KIX → GUM Jul 20, 23:25 UTCJul 21, 00:10 UTC44m
2026-07-20 TWB510 GUM → KIX Jul 20, 11:40 UTCJul 20, 12:45 UTC1h 5m
2026-07-20 TWB510 GUM → KIX Jul 20, 09:50 UTCJul 20, 10:10 UTC20m
2026-07-20 TWB509 KIX → GUM Jul 20, 02:05 UTCJul 20, 02:20 UTC15m
2026-07-19 TWB509 KIX → GUM Jul 19, 23:30 UTCJul 20, 00:15 UTC45m
2026-07-19 TWB423 - Jul 19, 13:15 UTCJul 19, 21:00 UTC7h 45m
2026-07-19 TWB810 - Jul 19, 10:40 UTCJul 19, 11:10 UTC30m
2026-07-19 TWB727 - Jul 19, 08:20 UTCJul 19, 08:55 UTC35m
2026-07-19 TWB722 - Jul 19, 06:30 UTCJul 19, 07:10 UTC40m
2026-07-19 TWB713 - Jul 19, 03:25 UTCJul 19, 04:00 UTC35m
2026-07-19 TWB708 - Jul 19, 01:35 UTCJul 19, 02:20 UTC45m
2026-07-18 TWB705 - Jul 18, 23:35 UTCJul 19, 00:05 UTC30m
2026-07-18 TWB922 PUS → GMP Jul 18, 21:55 UTCJul 18, 22:35 UTC40m
2026-07-18 TWB927 GMP → PUS Jul 18, 12:55 UTCJul 18, 13:35 UTC40m
2026-07-18 TWB732 - Jul 18, 11:25 UTCJul 18, 12:00 UTC35m
2026-07-18 TWB731 - Jul 18, 09:20 UTCJul 18, 09:55 UTC35m
2026-07-18 TWB724 - Jul 18, 07:35 UTCJul 18, 08:15 UTC40m
2026-07-18 TWB723 - Jul 18, 05:25 UTCJul 18, 06:00 UTC35m
2026-07-18 TWB712 - Jul 18, 03:20 UTCJul 18, 04:00 UTC40m
2026-07-18 TWB707 - Jul 18, 01:05 UTCJul 18, 01:39 UTC35m
2026-07-17 TWB702 CJU → GMP Jul 17, 23:14 UTCJul 17, 23:45 UTC30m
2026-07-17 TWB801 TAE → CJU Jul 17, 21:30 UTCJul 17, 21:44 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 HL8751 page for operator, model, and routing details .

Mode-S 71C751 frequently asked

What is Mode-S code 71C751?
71C751 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8751.
Where is Mode-S 71C751 registered?
Mode-S code 71C751 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 71C751 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 09:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C751, octal 34343521, decimal 7,456,593.
What flights does 71C751 operate?
Mode-S 71C751 has broadcast 20 distinct callsigns, including TWB282, TWB281, TWB245, TWB206, TWB205.