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 Jul 26, 20:55 UTC
Flights observed
580
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 20:55 UTC

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
TWB836 Tway Airlines 37 2026-07-21
TWB743 Tway Airlines 33 2026-07-20
TWB712 Tway Airlines 33 2026-07-24
TWB835 Tway Airlines 32 2026-07-24
TWB742 - 32 2026-07-20
TWB166 - 30 2026-06-30
TWB165 - 30 2026-06-30
TWB838 Tway Airlines 29 2026-07-21
TWB837 Tway Airlines 28 2026-07-21
TWB723 Tway Airlines 25 2026-07-24
TWB731 Tway Airlines 23 2026-07-24
TWB724 Tway Airlines 22 2026-07-24
TWB705 Tway Airlines 20 2026-07-24
TWB732 - 19 2026-07-24
TWB840 - 18 2026-07-21
TWB839 Tway Airlines 17 2026-07-21
TWB713 Tway Airlines 17 2026-07-25
TWB158 - 16 2026-07-05
TWB708 Tway Airlines 15 2026-07-25
TWB025 Tway Airlines 8 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB423 TAE → UBN Jul 26, 13:10 UTCJul 26, 20:55 UTC7h 45m
2026-07-26 TWB810 CJU → TAE Jul 26, 10:45 UTCJul 26, 11:15 UTC30m
2026-07-26 TWB727 GMP → CJU Jul 26, 08:30 UTCJul 26, 09:05 UTC35m
2026-07-26 TWB722 CJU → GMP Jul 26, 06:30 UTCJul 26, 07:10 UTC41m
2026-07-26 TWB715 GMP → CJU Jul 26, 04:20 UTCJul 26, 04:55 UTC35m
2026-07-26 TWB710 CJU → GMP Jul 26, 02:00 UTCJul 26, 02:45 UTC45m
2026-07-26 TWB805 TAE → CJU Jul 26, 00:05 UTCJul 26, 00:20 UTC15m
2026-07-25 TWB423 TAE → UBN Jul 25, 14:10 UTCJul 25, 21:05 UTC6h 55m
2026-07-25 TWB810 CJU → TAE Jul 25, 10:35 UTCJul 25, 10:55 UTC20m
2026-07-25 TWB727 GMP → CJU Jul 25, 08:25 UTCJul 25, 09:00 UTC35m
2026-07-25 TWB722 CJU → GMP Jul 25, 06:40 UTCJul 25, 07:20 UTC40m
2026-07-25 TWB713 GMP → CJU Jul 25, 03:30 UTCJul 25, 04:05 UTC35m
2026-07-25 TWB708 CJU → GMP Jul 25, 01:25 UTCJul 25, 02:10 UTC45m
2026-07-24 TWB705 GMP → CJU Jul 24, 23:05 UTCJul 24, 23:40 UTC35m
2026-07-24 TWB732 - Jul 24, 11:30 UTCJul 24, 12:15 UTC45m
2026-07-24 TWB731 GMP → CJU Jul 24, 09:20 UTCJul 24, 09:55 UTC35m
2026-07-24 TWB724 CJU → GMP Jul 24, 07:35 UTCJul 24, 08:20 UTC45m
2026-07-24 TWB723 GMP → CJU Jul 24, 05:35 UTCJul 24, 06:10 UTC35m
2026-07-24 TWB712 CJU → GMP Jul 24, 03:20 UTCJul 24, 04:00 UTC40m
2026-07-24 TWB835 CJJ → CJU Jul 24, 01:20 UTCJul 24, 01:50 UTC30m
2026-07-23 TWB157 - Jul 23, 08:40 UTCJul 23, 23:30 UTC14h 50m
2026-07-23 TWB328 KIX → CJJ Jul 23, 05:05 UTCJul 23, 06:10 UTC1h 5m
2026-07-23 TWB327 CJJ → KIX Jul 23, 02:05 UTCJul 23, 03:20 UTC1h 15m
2026-07-22 TWB045 - Jul 22, 13:10 UTCJul 22, 23:30 UTC10h 20m
2026-07-22 TWB226 FUK → CJJ Jul 22, 11:15 UTCJul 22, 11:40 UTC25m
2026-07-22 TWB328 KIX → CJJ Jul 22, 05:00 UTCJul 22, 05:25 UTC25m
2026-07-22 TWB327 CJJ → KIX Jul 22, 01:55 UTCJul 22, 03:10 UTC1h 15m
2026-07-21 TWB046 - Jul 21, 13:20 UTCJul 21, 23:25 UTC10h 5m
2026-07-21 TWB840 - Jul 21, 10:15 UTCJul 21, 10:45 UTC30m
2026-07-21 TWB839 CJJ → CJU Jul 21, 08:10 UTCJul 21, 08:40 UTC30m
2026-07-21 TWB838 CJU → CJJ Jul 21, 06:20 UTCJul 21, 06:50 UTC30m
2026-07-21 TWB837 CJJ → CJU Jul 21, 04:10 UTCJul 21, 04:40 UTC30m
2026-07-21 TWB836 CJU → CJJ Jul 21, 02:35 UTCJul 21, 03:05 UTC30m
2026-07-20 TWB743 GMP → CJU Jul 20, 09:00 UTCJul 20, 09:30 UTC30m
2026-07-20 TWB742 - Jul 20, 07:20 UTCJul 20, 08:00 UTC40m
2026-07-20 TWB713 GMP → CJU Jul 20, 03:45 UTCJul 20, 04:25 UTC40m
2026-07-20 TWB708 - Jul 20, 01:55 UTCJul 20, 02:35 UTC40m
2026-07-19 TWB705 - Jul 19, 23:15 UTCJul 19, 23:55 UTC40m
2026-07-19 TWB732 - Jul 19, 11:20 UTCJul 19, 11:55 UTC35m
2026-07-19 TWB743 GMP → CJU Jul 19, 08:55 UTCJul 19, 09:30 UTC35m
2026-07-19 TWB742 - Jul 19, 07:20 UTCJul 19, 07:55 UTC35m
2026-07-19 TWB837 CJJ → CJU Jul 19, 04:15 UTCJul 19, 04:45 UTC30m
2026-07-19 TWB836 - Jul 19, 02:05 UTCJul 19, 02:35 UTC30m
2026-07-18 TWB650 - Jul 18, 18:25 UTCJul 18, 19:40 UTC1h 15m
2026-07-18 TWB649 - Jul 18, 14:50 UTCJul 18, 16:00 UTC1h 10m
2026-07-18 TWB743 - Jul 18, 09:00 UTCJul 18, 09:35 UTC35m
2026-07-18 TWB742 - Jul 18, 07:20 UTCJul 18, 08:05 UTC45m
2026-07-18 TWB837 - Jul 18, 04:10 UTCJul 18, 04:40 UTC30m
2026-07-18 TWB836 - Jul 18, 02:35 UTCJul 18, 03:05 UTC31m
2026-07-18 TWB835 - Jul 18, 00:19 UTCJul 18, 00:45 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 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 Jul 26, 20:55 UTC.
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 TWB836, TWB743, TWB712, TWB835, TWB742.