Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C580

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

Currently assigned to HL8580 · BOEING 737 MAX 8

Hex
71C580
Octal
34342600
Decimal
7,456,128
Country
KR
Tail
HL8580
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
276
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C580.

Country allocation

The ICAO 24-bit address 71C580 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
TWB838 Tway Airlines 17 2026-05-24
TWB723 Tway Airlines 16 2026-05-25
TWB712 Tway Airlines 16 2026-05-25
TWB166 Tway Airlines 16 2026-05-29
TWB165 Tway Airlines 16 2026-05-29
TWB836 Tway Airlines 15 2026-05-29
TWB835 Tway Airlines 15 2026-05-20
TWB742 - 15 2026-05-29
TWB743 Tway Airlines 14 2026-05-29
TWB731 Tway Airlines 14 2026-05-26
TWB724 Tway Airlines 14 2026-05-26
TWB837 Tway Airlines 13 2026-05-29
TWB840 - 11 2026-05-19
TWB732 - 11 2026-05-26
TWB839 - 10 2026-05-19
TWB705 Tway Airlines 10 2026-05-26
TWB158 Tway Airlines 8 2026-05-24
TWB025 Tway Airlines 7 2026-04-20
TWB713 Tway Airlines 6 2026-05-27
TWB708 Tway Airlines 6 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 TWB166 SIN → CJU May 29, 22:20 UTCMay 29, 23:35 UTC1h 15m
2026-05-29 TWB165 CJU → SIN May 29, 12:35 UTCMay 29, 13:35 UTC1h 0m
2026-05-29 TWB743 GMP → CJU May 29, 09:15 UTCMay 29, 09:40 UTC25m
2026-05-29 TWB742 - May 29, 07:35 UTCMay 29, 08:05 UTC30m
2026-05-29 TWB837 CJJ → CJU May 29, 04:35 UTCMay 29, 04:50 UTC15m
2026-05-29 TWB836 CJU → CJJ May 29, 03:00 UTCMay 29, 03:25 UTC25m
2026-05-28 TWB166 SIN → CJU May 28, 19:00 UTCMay 28, 23:40 UTC4h 40m
2026-05-28 TWB165 CJU → SIN May 28, 13:00 UTCMay 28, 17:10 UTC4h 10m
2026-05-28 TWB743 GMP → CJU May 28, 08:50 UTCMay 28, 09:15 UTC25m
2026-05-28 TWB742 - May 28, 07:15 UTCMay 28, 07:50 UTC35m
2026-05-28 TWB837 CJJ → CJU May 28, 04:10 UTCMay 28, 04:30 UTC20m
2026-05-28 TWB836 CJU → CJJ May 28, 02:40 UTCMay 28, 03:05 UTC25m
2026-05-27 TWB166 SIN → CJU May 27, 21:45 UTCMay 27, 23:05 UTC1h 20m
2026-05-27 TWB166 SIN → CJU May 27, 18:40 UTCMay 27, 18:50 UTC10m
2026-05-27 TWB165 CJU → SIN May 27, 12:35 UTCMay 27, 13:40 UTC1h 5m
2026-05-27 TWB743 GMP → CJU May 27, 09:05 UTCMay 27, 09:30 UTC25m
2026-05-27 TWB742 - May 27, 07:20 UTCMay 27, 07:55 UTC35m
2026-05-27 TWB713 GMP → CJU May 27, 03:45 UTCMay 27, 04:09 UTC25m
2026-05-27 TWB708 CJU → GMP May 27, 01:54 UTCMay 27, 02:34 UTC40m
2026-05-26 TWB705 GMP → CJU May 26, 23:29 UTCMay 26, 23:54 UTC25m
2026-05-26 TWB732 - May 26, 11:54 UTCMay 26, 12:40 UTC45m
2026-05-26 TWB731 GMP → CJU May 26, 09:29 UTCMay 26, 09:55 UTC25m
2026-05-26 TWB724 CJU → GMP May 26, 07:49 UTCMay 26, 08:19 UTC30m
2026-05-26 TWB837 CJJ → CJU May 26, 04:15 UTCMay 26, 04:35 UTC20m
2026-05-26 TWB836 CJU → CJJ May 26, 02:49 UTCMay 26, 03:09 UTC20m
2026-05-25 TWB166 SIN → CJU May 25, 21:49 UTCMay 25, 23:10 UTC1h 20m
2026-05-25 TWB165 CJU → SIN May 25, 12:15 UTCMay 25, 16:35 UTC4h 20m
2026-05-25 TWB743 GMP → CJU May 25, 09:00 UTCMay 25, 09:30 UTC30m
2026-05-25 TWB742 - May 25, 07:30 UTCMay 25, 08:05 UTC35m
2026-05-25 TWB723 GMP → CJU May 25, 05:15 UTCMay 25, 05:40 UTC25m
2026-05-25 TWB712 CJU → GMP May 25, 03:10 UTCMay 25, 03:45 UTC35m
2026-05-24 TWB158 DPS → CJJ May 24, 23:10 UTCMay 24, 23:30 UTC20m
2026-05-24 TWB157 CJJ → DPS May 24, 08:45 UTCMay 24, 21:45 UTC13h 0m
2026-05-24 TWB838 CJU → CJJ May 24, 06:40 UTCMay 24, 07:00 UTC20m
2026-05-24 TWB713 GMP → CJU May 24, 03:50 UTCMay 24, 04:15 UTC25m
2026-05-24 TWB708 CJU → GMP May 24, 01:35 UTCMay 24, 02:05 UTC30m
2026-05-23 TWB650 - May 23, 18:35 UTCMay 23, 20:05 UTC1h 30m
2026-05-23 TWB649 CJU → MFM May 23, 14:30 UTCMay 23, 16:10 UTC1h 40m
2026-05-23 TWB731 GMP → CJU May 23, 09:25 UTCMay 23, 09:50 UTC25m
2026-05-23 TWB724 CJU → GMP May 23, 07:50 UTCMay 23, 08:20 UTC30m
2026-05-23 TWB723 GMP → CJU May 23, 05:15 UTCMay 23, 05:40 UTC25m
2026-05-23 TWB712 CJU → GMP May 23, 03:10 UTCMay 23, 03:45 UTC35m
2026-05-22 TWB166 SIN → CJU May 22, 21:30 UTCMay 22, 22:55 UTC1h 25m
2026-05-22 TWB165 CJU → SIN May 22, 12:15 UTCMay 22, 13:25 UTC1h 10m
2026-05-22 TWB743 GMP → CJU May 22, 09:05 UTCMay 22, 09:30 UTC25m
2026-05-22 TWB742 - May 22, 07:25 UTCMay 22, 08:05 UTC40m
2026-05-22 TWB837 CJJ → CJU May 22, 05:00 UTCMay 22, 05:20 UTC20m
2026-05-22 TWB836 CJU → CJJ May 22, 03:15 UTCMay 22, 03:40 UTC25m
2026-05-21 TWB166 SIN → CJU May 21, 21:35 UTCMay 21, 22:50 UTC1h 15m
2026-05-21 TWB165 CJU → SIN May 21, 12:00 UTCMay 21, 16:10 UTC4h 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 HL8580 page for operator, model, and routing details .

Mode-S 71C580 frequently asked

What is Mode-S code 71C580?
71C580 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8580.
Where is Mode-S 71C580 registered?
Mode-S code 71C580 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 71C580 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 71C580, octal 34342600, decimal 7,456,128.
What flights does 71C580 operate?
Mode-S 71C580 has broadcast 20 distinct callsigns, including TWB838, TWB723, TWB712, TWB166, TWB165.