Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 12h ago
Flights observed
138
Distinct callsigns
18
Country
KR
Last broadcast
12h 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 18 distinct

Callsign Airline Flights Last seen
TWB162 Tway Airlines 17 2026-05-29
TWB161 Tway Airlines 17 2026-05-29
TWB643 Tway Airlines 15 2026-05-25
TWB644 Tway Airlines 10 2026-05-25
TWB155 Tway Airlines 10 2026-05-27
TWB156 Tway Airlines 9 2026-05-27
TWB102 Tway Airlines 9 2026-04-15
TWB101 Tway Airlines 9 2026-04-15
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
TWB532 Tway Airlines 4 2026-05-04
TWB531 Tway Airlines 4 2026-05-03
TWB302 Tway Airlines 3 2026-05-13
TWB301 Tway Airlines 2 2026-05-12
TWB304 Tway Airlines 1 2026-05-28
TWB303 Tway Airlines 1 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 TWB162 SIN → ICN May 29, 18:25 UTCMay 29, 21:30 UTC3h 5m
2026-05-29 TWB162 SIN → ICN May 29, 15:20 UTCMay 29, 15:30 UTC10m
2026-05-29 TWB161 ICN → SIN May 29, 07:30 UTCMay 29, 10:10 UTC2h 40m
2026-05-29 TWB161 ICN → SIN May 29, 07:20 UTCMay 29, 07:25 UTC5m
2026-05-28 TWB304 KIX → ICN May 28, 05:50 UTCMay 28, 07:20 UTC1h 30m
2026-05-28 TWB303 ICN → KIX May 28, 02:15 UTCMay 28, 03:30 UTC1h 15m
2026-05-27 TWB156 CGK → ICN May 27, 17:15 UTCMay 27, 22:10 UTC4h 55m
2026-05-27 TWB156 CGK → ICN May 27, 15:15 UTCMay 27, 15:25 UTC10m
2026-05-27 TWB155 ICN → CGK May 27, 12:50 UTCMay 27, 13:00 UTC10m
2026-05-27 TWB155 ICN → CGK May 27, 06:40 UTCMay 27, 11:15 UTC4h 36m
2026-05-26 TWB502 SYD → ICN May 26, 02:15 UTCMay 26, 13:15 UTC11h 0m
2026-05-25 TWB501 ICN → SYD May 25, 13:20 UTCMay 25, 23:00 UTC9h 39m
2026-05-25 TWB644 HKG → ICN May 25, 05:30 UTCMay 25, 08:50 UTC3h 20m
2026-05-25 TWB643 ICN → HKG May 25, 03:00 UTCMay 25, 03:15 UTC15m
2026-05-25 TWB643 ICN → HKG May 25, 01:55 UTCMay 25, 02:25 UTC30m
2026-05-24 TWB162 SIN → ICN May 24, 18:10 UTCMay 24, 21:05 UTC2h 55m
2026-05-24 TWB162 SIN → ICN May 24, 15:15 UTCMay 24, 15:25 UTC10m
2026-05-24 TWB161 ICN → SIN May 24, 07:05 UTCMay 24, 09:50 UTC2h 45m
2026-05-23 TWB644 HKG → ICN May 23, 06:00 UTCMay 23, 09:20 UTC3h 20m
2026-05-23 TWB643 ICN → HKG May 23, 00:45 UTCMay 23, 04:00 UTC3h 14m
2026-05-22 TWB162 SIN → ICN May 22, 18:35 UTCMay 22, 21:40 UTC3h 5m
2026-05-22 TWB161 ICN → SIN May 22, 07:10 UTCMay 22, 09:55 UTC2h 45m
2026-05-22 TWB202 NRT → TAE May 22, 04:05 UTCMay 22, 04:45 UTC40m
2026-05-22 TWB201 ICN → FUK May 22, 01:30 UTCMay 22, 02:25 UTC55m
2026-05-21 TWB202 NRT → TAE May 21, 04:25 UTCMay 21, 05:05 UTC40m
2026-05-21 TWB201 ICN → FUK May 21, 01:25 UTCMay 21, 01:50 UTC25m
2026-05-20 TWB156 CGK → ICN May 20, 16:55 UTCMay 20, 22:05 UTC5h 10m
2026-05-20 TWB156 CGK → ICN May 20, 15:20 UTCMay 20, 15:30 UTC10m
2026-05-20 TWB155 ICN → CGK May 20, 13:15 UTCMay 20, 13:25 UTC10m
2026-05-20 TWB155 ICN → CGK May 20, 06:55 UTCMay 20, 11:45 UTC4h 50m
2026-05-20 TWB202 NRT → TAE May 20, 03:50 UTCMay 20, 04:55 UTC1h 6m
2026-05-20 TWB201 ICN → FUK May 20, 01:30 UTCMay 20, 02:00 UTC30m
2026-05-18 TWB156 CGK → ICN May 18, 16:50 UTCMay 18, 22:20 UTC5h 29m
2026-05-18 TWB156 CGK → ICN May 18, 15:05 UTCMay 18, 15:15 UTC10m
2026-05-18 TWB155 ICN → CGK May 18, 12:40 UTCMay 18, 12:55 UTC15m
2026-05-18 TWB155 ICN → CGK May 18, 06:35 UTCMay 18, 11:10 UTC4h 35m
2026-05-17 TWB162 SIN → ICN May 17, 18:25 UTCMay 17, 21:35 UTC3h 10m
2026-05-17 TWB162 SIN → ICN May 17, 15:20 UTCMay 17, 15:31 UTC10m
2026-05-17 TWB161 ICN → SIN May 17, 07:10 UTCMay 17, 09:50 UTC2h 40m
2026-05-17 TWB202 NRT → TAE May 17, 04:15 UTCMay 17, 04:50 UTC35m
2026-05-17 TWB201 ICN → FUK May 17, 01:15 UTCMay 17, 01:45 UTC30m
2026-05-16 TWB502 SYD → ICN May 16, 02:00 UTCMay 16, 12:25 UTC10h 26m
2026-05-15 TWB501 ICN → SYD May 15, 13:20 UTCMay 15, 23:25 UTC10h 4m
2026-05-13 TWB156 CGK → ICN May 13, 16:45 UTCMay 13, 21:55 UTC5h 10m
2026-05-13 TWB156 CGK → ICN May 13, 15:00 UTCMay 13, 15:10 UTC10m
2026-05-13 TWB155 ICN → CGK May 13, 12:40 UTCMay 13, 12:50 UTC10m
2026-05-13 TWB155 ICN → CGK May 13, 06:20 UTCMay 13, 11:05 UTC4h 45m
2026-05-13 TWB302 KIX → ICN May 13, 03:10 UTCMay 13, 04:30 UTC1h 20m
2026-05-12 TWB301 ICN → KIX May 12, 23:15 UTCMay 13, 00:35 UTC1h 20m
2026-05-11 TWB156 CGK → ICN May 11, 17:05 UTCMay 11, 22:15 UTC5h 10m

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 12h 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 18 distinct callsigns, including TWB162, TWB161, TWB643, TWB644, TWB155.