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 1h ago
Flights observed
160
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

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 Tway Airlines 22 2026-05-30
TWB281 Tway Airlines 21 2026-05-22
TWB007 - 13 2026-05-23
TWB055 Tway Airlines 12 2026-05-04
TWB245 Tway Airlines 11 2026-05-20
TWB246 Tway Airlines 9 2026-05-20
TWB206 Tway Airlines 7 2026-05-29
TWB205 Tway Airlines 7 2026-05-29
TWB302 Tway Airlines 6 2026-05-14
TWB008 - 6 2026-05-27
TWB301 Tway Airlines 5 2026-05-13
TWB056 Tway Airlines 5 2026-04-18
TWB438 Tway Airlines 4 2026-05-21
TWB437 Tway Airlines 4 2026-05-30
TWB304 Tway Airlines 3 2026-05-25
TWB303 Tway Airlines 3 2026-05-25
TWB202 Tway Airlines 3 2026-05-27
TWB201 Tway Airlines 3 2026-05-27
TWB034 Tway Airlines 3 2026-04-16
TWB033 Tway Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 TWB437 ICN → FRU May 30, 10:05 UTCMay 30, 10:15 UTC10m
2026-05-30 TWB282 OKA → ICN May 30, 02:20 UTCMay 30, 07:45 UTC5h 25m
2026-05-29 TWB014 DAD → ICN May 29, 13:00 UTCMay 29, 23:25 UTC10h 25m
2026-05-29 TWB206 FUK → ICN May 29, 09:15 UTCMay 29, 09:50 UTC35m
2026-05-29 TWB205 ICN → FUK May 29, 06:15 UTCMay 29, 06:45 UTC30m
2026-05-27 TWB008 ICN → ICN May 27, 23:10 UTCMay 28, 09:20 UTC10h 10m
2026-05-27 TWB206 FUK → ICN May 27, 09:15 UTCMay 27, 10:10 UTC55m
2026-05-27 TWB205 ICN → FUK May 27, 07:00 UTCMay 27, 07:25 UTC25m
2026-05-27 TWB202 NRT → TAE May 27, 04:34 UTCMay 27, 05:40 UTC1h 5m
2026-05-27 TWB201 ICN → FUK May 27, 02:09 UTCMay 27, 02:39 UTC30m
2026-05-26 TWB014 DAD → ICN May 26, 13:00 UTCMay 27, 00:34 UTC11h 35m
2026-05-26 TWB206 FUK → ICN May 26, 08:39 UTCMay 26, 09:40 UTC1h 0m
2026-05-26 TWB205 ICN → FUK May 26, 06:20 UTCMay 26, 06:49 UTC30m
2026-05-25 TWB304 KIX → ICN May 25, 05:45 UTCMay 25, 07:05 UTC1h 20m
2026-05-25 TWB303 ICN → KIX May 25, 02:15 UTCMay 25, 03:40 UTC1h 25m
2026-05-23 TWB007 ICN → ICN May 23, 23:15 UTCMay 24, 09:15 UTC10h 0m
2026-05-23 TWB008 - May 23, 01:15 UTCMay 23, 09:50 UTC8h 34m
2026-05-22 TWB007 - May 22, 23:30 UTCMay 22, 23:55 UTC25m
2026-05-22 TWB281 ICN → OKA May 22, 02:20 UTCMay 22, 08:10 UTC5h 50m
2026-05-21 TWB438 FRU → ICN May 21, 23:50 UTCMay 22, 00:10 UTC20m
2026-05-21 TWB438 FRU → ICN May 21, 11:15 UTCMay 21, 22:55 UTC11h 40m
2026-05-21 TWB437 ICN → FRU May 21, 10:00 UTCMay 21, 10:15 UTC15m
2026-05-21 TWB282 OKA → ICN May 21, 02:20 UTCMay 21, 08:10 UTC5h 50m
2026-05-20 TWB246 NRT → ICN May 20, 10:25 UTCMay 20, 12:30 UTC2h 5m
2026-05-20 TWB245 ICN → NRT May 20, 06:25 UTCMay 20, 08:15 UTC1h 50m
2026-05-20 TWB438 FRU → ICN May 20, 00:10 UTCMay 20, 00:35 UTC25m
2026-05-19 TWB437 ICN → FRU May 19, 10:15 UTCMay 19, 23:15 UTC13h 0m
2026-05-19 TWB304 KIX → ICN May 19, 05:50 UTCMay 19, 07:10 UTC1h 20m
2026-05-19 TWB303 ICN → KIX May 19, 02:20 UTCMay 19, 03:50 UTC1h 30m
2026-05-18 TWB246 NRT → ICN May 18, 10:25 UTCMay 18, 12:10 UTC1h 45m
2026-05-18 TWB245 ICN → NRT May 18, 06:20 UTCMay 18, 08:15 UTC1h 55m
2026-05-17 TWB282 OKA → ICN May 17, 07:00 UTCMay 17, 07:30 UTC30m
2026-05-17 TWB282 OKA → ICN May 17, 05:45 UTCMay 17, 06:00 UTC15m
2026-05-17 TWB281 ICN → OKA May 17, 02:25 UTCMay 17, 04:05 UTC1h 40m
2026-05-16 TWB438 FRU → ICN May 16, 23:55 UTCMay 17, 00:15 UTC20m
2026-05-16 TWB437 ICN → FRU May 16, 10:05 UTCMay 16, 10:25 UTC20m
2026-05-16 TWB282 OKA → ICN May 16, 07:16 UTCMay 16, 07:41 UTC25m
2026-05-16 TWB282 OKA → ICN May 16, 06:01 UTCMay 16, 06:10 UTC10m
2026-05-16 TWB281 ICN → OKA May 16, 02:10 UTCMay 16, 03:55 UTC1h 45m
2026-05-14 TWB246 NRT → ICN May 14, 10:10 UTCMay 14, 11:55 UTC1h 45m
2026-05-14 TWB245 ICN → NRT May 14, 06:25 UTCMay 14, 08:50 UTC2h 25m
2026-05-14 TWB302 KIX → ICN May 14, 02:55 UTCMay 14, 04:20 UTC1h 25m
2026-05-13 TWB301 ICN → KIX May 13, 23:15 UTCMay 14, 00:40 UTC1h 25m
2026-05-13 TWB354 - May 13, 04:45 UTCMay 13, 06:10 UTC1h 25m
2026-05-13 TWB353 - May 13, 02:00 UTCMay 13, 03:10 UTC1h 10m
2026-05-12 TWB013 ICN → DAD May 12, 13:05 UTCMay 12, 22:35 UTC9h 30m
2026-05-12 TWB206 FUK → ICN May 12, 08:55 UTCMay 12, 09:30 UTC35m
2026-05-12 TWB205 ICN → FUK May 12, 06:10 UTCMay 12, 07:10 UTC1h 0m
2026-05-11 TWB244 NRT → ICN May 11, 05:50 UTCMay 11, 07:55 UTC2h 5m
2026-05-11 TWB243 ICN → NRT May 11, 01:45 UTCMay 11, 03:35 UTC1h 50m

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 1h ago.
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, TWB007, TWB055, TWB245.