Apparatus

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sensors Mode-S transponder

71C501

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

Currently assigned to HL8501 · AIRBUS A-330-300

Hex
71C501
Octal
34342401
Decimal
7,456,001
Country
KR
Tail
HL8501
Type
A333
No current signal · last broadcast Jul 26, 08:20 UTC
Flights observed
265
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 08:20 UTC

Last known position

Most recent position reported by Mode-S 71C501.

Country allocation

The ICAO 24-bit address 71C501 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
TWB155 - 34 2026-07-18
TWB162 Tway Airlines 27 2026-07-24
TWB161 Tway Airlines 27 2026-07-24
TWB156 - 21 2026-07-18
TWB643 Tway Airlines 15 2026-05-25
TWB264 Tway Airlines 12 2026-07-26
TWB263 Tway Airlines 12 2026-07-26
TWB644 Tway Airlines 10 2026-05-25
TWB532 Tway Airlines 10 2026-07-20
TWB531 Tway Airlines 10 2026-07-19
TWB102 Tway Airlines 9 2026-04-15
TWB101 Tway Airlines 9 2026-04-15
TWB614 Tway Airlines 8 2026-07-25
TWB613 Tway Airlines 8 2026-07-24
TWB421 Tway Airlines 8 2026-07-22
TWB202 Tway Airlines 8 2026-07-24
TWB201 Tway Airlines 8 2026-07-24
TWB501 Tway Airlines 7 2026-05-25
TWB502 Tway Airlines 6 2026-05-26
TWB422 - 5 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB264 CTS → ICN Jul 26, 05:45 UTCJul 26, 08:20 UTC2h 36m
2026-07-26 TWB263 ICN → CTS Jul 26, 01:45 UTCJul 26, 04:05 UTC2h 20m
2026-07-25 TWB206 FUK → ICN Jul 25, 09:10 UTCJul 25, 10:10 UTC1h 0m
2026-07-25 TWB205 ICN → FUK Jul 25, 06:40 UTCJul 25, 07:50 UTC1h 10m
2026-07-25 TWB614 SHE → ICN Jul 25, 04:45 UTCJul 25, 05:05 UTC20m
2026-07-24 TWB613 ICN → SHE Jul 24, 23:50 UTCJul 25, 00:30 UTC40m
2026-07-24 TWB162 SIN → ICN Jul 24, 17:15 UTCJul 24, 22:15 UTC5h 0m
2026-07-24 TWB162 SIN → ICN Jul 24, 15:40 UTCJul 24, 15:50 UTC10m
2026-07-24 TWB161 ICN → SIN Jul 24, 12:50 UTCJul 24, 13:00 UTC10m
2026-07-24 TWB161 ICN → SIN Jul 24, 07:20 UTCJul 24, 10:10 UTC2h 50m
2026-07-24 TWB202 NRT → TAE Jul 24, 04:05 UTCJul 24, 05:00 UTC55m
2026-07-24 TWB201 ICN → FUK Jul 24, 01:25 UTCJul 24, 02:30 UTC1h 5m
2026-07-23 TWB162 SIN → ICN Jul 23, 18:25 UTCJul 23, 21:25 UTC3h 0m
2026-07-23 TWB161 ICN → SIN Jul 23, 12:45 UTCJul 23, 12:55 UTC10m
2026-07-23 TWB161 ICN → SIN Jul 23, 07:15 UTCJul 23, 10:00 UTC2h 45m
2026-07-23 TWB614 SHE → ICN Jul 23, 05:05 UTCJul 23, 05:25 UTC20m
2026-07-22 TWB613 ICN → SHE Jul 22, 23:35 UTCJul 23, 00:05 UTC30m
2026-07-22 TWB421 ICN → UBN Jul 22, 03:50 UTCJul 22, 04:10 UTC20m
2026-07-22 TWB421 ICN → UBN Jul 22, 02:25 UTCJul 22, 02:50 UTC25m
2026-07-21 TWB614 - Jul 21, 04:20 UTCJul 21, 04:40 UTC20m
2026-07-20 TWB613 - Jul 20, 23:35 UTCJul 21, 00:10 UTC35m
2026-07-20 TWB532 YVR → ICN Jul 20, 00:50 UTCJul 20, 11:35 UTC10h 45m
2026-07-19 TWB531 ICN → YVR Jul 19, 11:50 UTCJul 19, 21:55 UTC10h 5m
2026-07-19 TWB422 - Jul 19, 09:25 UTCJul 19, 09:45 UTC20m
2026-07-19 TWB421 - Jul 19, 02:15 UTCJul 19, 03:45 UTC1h 30m
2026-07-18 TWB156 - Jul 18, 16:45 UTCJul 18, 22:00 UTC5h 15m
2026-07-18 TWB155 - Jul 18, 12:30 UTCJul 18, 12:50 UTC20m
2026-07-18 TWB155 - Jul 18, 06:15 UTCJul 18, 10:55 UTC4h 40m
2026-07-18 TWB614 - Jul 18, 04:05 UTCJul 18, 04:30 UTC25m
2026-07-17 TWB613 - Jul 17, 23:25 UTCJul 17, 23:45 UTC20m
2026-07-15 TWB532 YVR → ICN Jul 15, 00:30 UTCJul 15, 11:05 UTC10h 35m
2026-07-14 TWB531 ICN → YVR Jul 14, 11:55 UTCJul 14, 22:05 UTC10h 10m
2026-07-14 TWB264 - Jul 14, 05:40 UTCJul 14, 07:55 UTC2h 15m
2026-07-14 TWB263 - Jul 14, 01:30 UTCJul 14, 03:45 UTC2h 15m
2026-07-13 TWB614 - Jul 13, 05:20 UTCJul 13, 05:40 UTC20m
2026-07-12 TWB613 - Jul 12, 23:25 UTCJul 12, 23:50 UTC25m
2026-07-12 TWB422 - Jul 12, 09:30 UTCJul 12, 10:01 UTC30m
2026-07-12 TWB421 - Jul 12, 03:50 UTCJul 12, 04:10 UTC20m
2026-07-12 TWB421 - Jul 12, 02:40 UTCJul 12, 03:01 UTC20m
2026-07-11 TWB162 - Jul 11, 18:05 UTCJul 11, 22:05 UTC4h 0m
2026-07-11 TWB161 - Jul 11, 07:15 UTCJul 11, 11:50 UTC4h 35m
2026-07-10 TWB156 - Jul 10, 16:50 UTCJul 10, 22:25 UTC5h 35m
2026-07-10 TWB155 - Jul 10, 13:10 UTCJul 10, 13:20 UTC10m
2026-07-10 TWB155 - Jul 10, 06:35 UTCJul 10, 11:40 UTC5h 5m
2026-07-09 TWB162 - Jul 9, 18:40 UTCJul 9, 21:05 UTC2h 25m
2026-07-09 TWB161 - Jul 9, 07:05 UTCJul 9, 12:45 UTC5h 40m
2026-07-09 TWB614 - Jul 9, 04:40 UTCJul 9, 05:00 UTC20m
2026-07-08 TWB613 - Jul 8, 23:25 UTCJul 8, 23:50 UTC25m
2026-07-08 TWB264 - Jul 8, 07:10 UTCJul 8, 09:30 UTC2h 20m
2026-07-08 TWB263 - Jul 8, 03:05 UTCJul 8, 05:25 UTC2h 20m

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 HL8501 page for operator, model, and routing details .

Mode-S 71C501 frequently asked

What is Mode-S code 71C501?
71C501 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8501.
Where is Mode-S 71C501 registered?
Mode-S code 71C501 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 71C501 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C501, octal 34342401, decimal 7,456,001.
What flights does 71C501 operate?
Mode-S 71C501 has broadcast 20 distinct callsigns, including TWB155, TWB162, TWB161, TWB156, TWB643.