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 49m ago
Flights observed
234
Distinct callsigns
20
Country
KR
Last broadcast
49m ago

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 - 32 2026-07-10
TWB162 - 24 2026-07-11
TWB161 - 23 2026-07-11
TWB156 - 20 2026-07-10
TWB643 Tway Airlines 15 2026-05-25
TWB264 - 11 2026-07-14
TWB263 - 11 2026-07-14
TWB644 Tway Airlines 10 2026-05-25
TWB531 - 9 2026-07-14
TWB102 Tway Airlines 9 2026-04-15
TWB101 Tway Airlines 9 2026-04-15
TWB532 - 8 2026-07-06
TWB501 Tway Airlines 7 2026-05-25
TWB202 Tway Airlines 7 2026-05-22
TWB201 Tway Airlines 7 2026-05-22
TWB502 Tway Airlines 6 2026-05-26
TWB421 - 5 2026-07-12
TWB614 - 4 2026-07-13
TWB613 - 4 2026-07-12
TWB422 - 4 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB531 - Jul 14, 11:55 UTCJul 14, 12:15 UTC20m
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
2026-07-06 TWB532 - Jul 6, 00:45 UTCJul 6, 13:05 UTC12h 20m
2026-07-05 TWB531 ICN → YVR Jul 5, 12:00 UTCJul 5, 21:30 UTC9h 30m
2026-07-05 TWB264 - Jul 5, 05:45 UTCJul 5, 08:20 UTC2h 35m
2026-07-05 TWB263 - Jul 5, 01:45 UTCJul 5, 04:05 UTC2h 20m
2026-07-04 TWB162 - Jul 4, 18:30 UTCJul 4, 21:30 UTC3h 0m
2026-07-04 TWB162 - Jul 4, 15:20 UTCJul 4, 15:30 UTC10m
2026-07-04 TWB161 - Jul 4, 07:20 UTCJul 4, 13:10 UTC5h 50m
2026-07-03 TWB264 - Jul 3, 05:45 UTCJul 3, 08:25 UTC2h 40m
2026-07-03 TWB263 - Jul 3, 01:25 UTCJul 3, 03:40 UTC2h 15m
2026-06-30 TWB264 - Jun 30, 05:45 UTCJun 30, 08:20 UTC2h 35m
2026-06-30 TWB263 ICN → CTS Jun 30, 01:25 UTCJun 30, 03:40 UTC2h 16m
2026-06-29 TWB156 - Jun 29, 17:10 UTCJun 29, 22:24 UTC5h 15m
2026-06-29 TWB155 - Jun 29, 13:30 UTCJun 29, 13:44 UTC15m
2026-06-29 TWB155 - Jun 29, 07:05 UTCJun 29, 12:05 UTC5h 0m
2026-06-29 TWB614 - Jun 29, 03:49 UTCJun 29, 04:09 UTC20m
2026-06-28 TWB613 - Jun 28, 23:25 UTCJun 28, 23:44 UTC20m
2026-06-28 TWB422 UBN → ICN Jun 28, 09:30 UTCJun 28, 10:00 UTC30m
2026-06-28 TWB421 ICN → UBN Jun 28, 02:05 UTCJun 28, 03:40 UTC1h 35m
2026-06-27 TWB264 - Jun 27, 05:59 UTCJun 27, 08:35 UTC2h 35m
2026-06-27 TWB263 - Jun 27, 01:39 UTCJun 27, 03:49 UTC2h 10m
2026-06-26 TWB156 CGK → ICN Jun 26, 16:54 UTCJun 26, 21:55 UTC5h 0m
2026-06-26 TWB155 ICN → CGK Jun 26, 12:44 UTCJun 26, 12:59 UTC15m
2026-06-26 TWB155 ICN → CGK Jun 26, 06:29 UTCJun 26, 11:24 UTC4h 55m
2026-06-26 TWB614 - Jun 26, 03:54 UTCJun 26, 04:24 UTC30m
2026-06-25 TWB613 - Jun 25, 23:24 UTCJun 25, 23:49 UTC25m
2026-06-24 TWB532 - Jun 24, 00:59 UTCJun 24, 11:59 UTC11h 0m
2026-06-23 TWB531 ICN → YVR Jun 23, 12:09 UTCJun 23, 21:34 UTC9h 25m
2026-06-22 TWB264 CTS → ICN Jun 22, 05:40 UTCJun 22, 08:15 UTC2h 35m
2026-06-22 TWB263 - Jun 22, 01:29 UTCJun 22, 03:45 UTC2h 15m
2026-06-21 TWB162 - Jun 21, 18:50 UTCJun 21, 21:39 UTC2h 50m
2026-06-21 TWB161 - Jun 21, 12:35 UTCJun 21, 13:04 UTC30m

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 49m ago.
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.