Apparatus

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sensors Mode-S transponder

71C547

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

Currently assigned to HL8547 · BOEING 737-800

Hex
71C547
Octal
34342507
Decimal
7,456,071
Country
KR
Tail
HL8547
Type
B738
No current signal · last broadcast 3h ago
Flights observed
189
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 71C547.

Country allocation

The ICAO 24-bit address 71C547 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
TWB664 Tway Airlines 8 2026-05-27
TWB663 Tway Airlines 6 2026-05-27
TWB510 Tway Airlines 5 2026-05-05
TWB304 Tway Airlines 5 2026-05-13
TWB243 Tway Airlines 5 2026-05-14
TWB208 Tway Airlines 5 2026-04-27
TWB690 Tway Airlines 4 2026-05-28
TWB689 Tway Airlines 4 2026-05-28
TWB671 Tway Airlines 4 2026-04-28
TWB312 Tway Airlines 4 2026-05-16
TWB252 Tway Airlines 4 2026-05-27
TWB244 Tway Airlines 4 2026-05-14
TWB850 - 3 2026-05-17
TWB843 Tway Airlines 3 2026-05-21
TWB725 - 3 2026-05-08
TWB702 Tway Airlines 3 2026-05-21
TWB672 Tway Airlines 3 2026-04-28
TWB669 Tway Airlines 3 2026-04-25
TWB509 Tway Airlines 3 2026-05-04
TWB305 Tway Airlines 3 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 TWB306 KIX → ICN May 30, 10:55 UTCMay 30, 12:25 UTC1h 30m
2026-05-30 TWB313 TAE → KIX May 30, 08:05 UTCMay 30, 09:10 UTC1h 5m
2026-05-29 TWB715 GMP → CJU May 29, 04:20 UTCMay 29, 04:45 UTC25m
2026-05-29 TWB710 CJU → GMP May 29, 02:05 UTCMay 29, 02:35 UTC30m
2026-05-28 TWB423 TAE → UBN May 28, 13:05 UTCMay 28, 20:35 UTC7h 30m
2026-05-28 TWB690 KHH → CJU May 28, 06:15 UTCMay 28, 07:00 UTC45m
2026-05-28 TWB689 CJU → KHH May 28, 03:25 UTCMay 28, 04:20 UTC55m
2026-05-27 TWB664 TPE → TAE May 27, 19:50 UTCMay 27, 20:05 UTC15m
2026-05-27 TWB664 TPE → TAE May 27, 18:10 UTCMay 27, 18:35 UTC25m
2026-05-27 TWB663 TAE → TPE May 27, 15:25 UTCMay 27, 16:00 UTC35m
2026-05-27 TWB216 NRT → ICN May 27, 10:40 UTCMay 27, 11:15 UTC35m
2026-05-27 TWB252 NRT → TAE May 27, 05:09 UTCMay 27, 06:55 UTC1h 45m
2026-05-27 TWB251 TAE → NRT May 27, 02:09 UTCMay 27, 03:24 UTC1h 15m
2026-05-26 TWB664 TPE → TAE May 26, 18:10 UTCMay 26, 18:34 UTC25m
2026-05-26 TWB663 TAE → TPE May 26, 14:09 UTCMay 26, 16:00 UTC1h 50m
2026-05-26 TWB727 GMP → CJU May 26, 08:19 UTCMay 26, 08:45 UTC25m
2026-05-26 TWB722 CJU → GMP May 26, 06:49 UTCMay 26, 07:19 UTC30m
2026-05-26 TWB332 KIX → CJU May 26, 03:25 UTCMay 26, 04:00 UTC35m
2026-05-26 TWB319 PUS → KIX May 26, 00:44 UTCMay 26, 01:30 UTC45m
2026-05-25 TWB322 KIX → PUS May 25, 06:45 UTCMay 25, 07:25 UTC40m
2026-05-24 TWB676 KHH → PUS May 24, 10:00 UTCMay 25, 05:15 UTC19h 15m
2026-05-23 TWB041 PUS → CXR May 23, 14:05 UTCMay 24, 08:25 UTC18h 20m
2026-05-23 TWB041 PUS → CXR May 23, 10:10 UTCMay 24, 08:25 UTC22h 15m
2026-05-23 TWB331 CJU → KIX May 23, 08:10 UTCMay 23, 08:50 UTC40m
2026-05-23 TWB717 GMP → CJU May 23, 05:30 UTCMay 23, 05:55 UTC25m
2026-05-23 TWB718 CJU → GMP May 23, 03:45 UTCMay 23, 04:25 UTC40m
2026-05-23 TWB804 CJU → TAE May 23, 00:00 UTCMay 23, 00:10 UTC10m
2026-05-22 TWB701 GMP → CJU May 22, 21:40 UTCMay 22, 22:05 UTC25m
2026-05-22 TWB736 - May 22, 13:15 UTCMay 22, 13:45 UTC30m
2026-05-22 TWB735 GMP → CJU May 22, 10:50 UTCMay 22, 11:15 UTC25m
2026-05-22 TWB728 CJU → GMP May 22, 09:00 UTCMay 22, 09:35 UTC35m
2026-05-22 TWB707 GMP → CJU May 22, 00:55 UTCMay 22, 01:20 UTC25m
2026-05-21 TWB702 CJU → GMP May 21, 23:15 UTCMay 21, 23:50 UTC35m
2026-05-21 TWB810 CJU → TAE May 21, 10:50 UTCMay 21, 11:00 UTC10m
2026-05-21 TWB690 KHH → CJU May 21, 05:50 UTCMay 21, 06:30 UTC40m
2026-05-21 TWB689 CJU → KHH May 21, 03:25 UTCMay 21, 04:15 UTC50m
2026-05-21 TWB843 CJJ → CJU May 21, 00:00 UTCMay 21, 00:20 UTC20m
2026-05-20 TWB226 FUK → CJJ May 20, 10:40 UTCMay 20, 11:30 UTC50m
2026-05-20 TWB225 CJJ → FUK May 20, 08:20 UTCMay 20, 08:35 UTC15m
2026-05-20 TWB328 KIX → CJJ May 20, 05:05 UTCMay 20, 06:20 UTC1h 15m
2026-05-20 TWB327 CJJ → KIX May 20, 02:00 UTCMay 20, 03:10 UTC1h 10m
2026-05-19 TWB226 FUK → CJJ May 19, 10:30 UTCMay 19, 11:15 UTC45m
2026-05-19 TWB225 CJJ → FUK May 19, 08:05 UTCMay 19, 08:30 UTC25m
2026-05-19 TWB328 KIX → CJJ May 19, 05:00 UTCMay 19, 06:00 UTC1h 0m
2026-05-19 TWB327 CJJ → KIX May 19, 02:05 UTCMay 19, 03:30 UTC1h 25m
2026-05-18 TWB686 YNJ → CJJ May 18, 08:05 UTCMay 18, 08:35 UTC30m
2026-05-18 TWB685 CJJ → YNJ May 18, 03:10 UTCMay 18, 03:40 UTC30m
2026-05-18 TWB842 CJU → CJJ May 18, 01:20 UTCMay 18, 01:45 UTC25m
2026-05-17 TWB841 CJJ → CJU May 17, 23:05 UTCMay 17, 23:25 UTC20m
2026-05-17 TWB850 - May 17, 13:20 UTCMay 17, 13:45 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 HL8547 page for operator, model, and routing details .

Mode-S 71C547 frequently asked

What is Mode-S code 71C547?
71C547 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8547.
Where is Mode-S 71C547 registered?
Mode-S code 71C547 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 71C547 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 71C547, octal 34342507, decimal 7,456,071.
What flights does 71C547 operate?
Mode-S 71C547 has broadcast 20 distinct callsigns, including TWB664, TWB663, TWB510, TWB304, TWB243.