Apparatus

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sensors Mode-S transponder

71C741

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

Currently assigned to HL8741 · AIRBUS A-320

Hex
71C741
Octal
34343501
Decimal
7,456,577
Country
KR
Tail
HL8741
Type
A320
Transponder active on ground
Flights observed
376
Distinct callsigns
12
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C741.

Country allocation

The ICAO 24-bit address 71C741 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 12 distinct

Callsign Airline Flights Last seen
PTA6502 Ptarmigan Airways 50 2026-05-29
PTA6504 Ptarmigan Airways 49 2026-05-29
PTA6704 Ptarmigan Airways 47 2026-05-29
PTA6503 Ptarmigan Airways 47 2026-05-29
PTA6703 Ptarmigan Airways 46 2026-05-29
PTA6501 Ptarmigan Airways 46 2026-05-28
PTA6702 Ptarmigan Airways 44 2026-05-28
PTA6701 Ptarmigan Airways 43 2026-05-29
WE6501 - 1 2026-04-16
PTA602P Ptarmigan Airways 1 2026-05-29
PTA601P Ptarmigan Airways 1 2026-04-30
PTA511 Ptarmigan Airways 1 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 PTA511 ICN → KIX May 30, 02:30 UTCMay 30, 04:00 UTC1h 30m
2026-05-29 PTA602P GMP → ICN May 29, 22:10 UTCMay 29, 22:30 UTC20m
2026-05-29 PTA6504 CJU → GMP May 29, 13:15 UTCMay 29, 13:50 UTC35m
2026-05-29 PTA6503 GMP → CJU May 29, 10:45 UTCMay 29, 11:10 UTC25m
2026-05-29 PTA6502 CJU → GMP May 29, 09:00 UTCMay 29, 09:35 UTC35m
2026-05-29 PTA6703 YNY → CJU May 29, 06:25 UTCMay 29, 06:55 UTC30m
2026-05-29 PTA6704 CJU → YNY May 29, 04:10 UTCMay 29, 04:35 UTC25m
2026-05-29 PTA6701 YNY → CJU May 29, 01:40 UTCMay 29, 02:10 UTC30m
2026-05-28 PTA6702 CJU → YNY May 28, 23:50 UTCMay 29, 00:15 UTC25m
2026-05-28 PTA6501 GMP → CJU May 28, 21:25 UTCMay 28, 21:50 UTC25m
2026-05-28 PTA6504 CJU → GMP May 28, 13:00 UTCMay 28, 13:30 UTC30m
2026-05-28 PTA6503 GMP → CJU May 28, 10:40 UTCMay 28, 11:00 UTC20m
2026-05-28 PTA6502 CJU → GMP May 28, 08:55 UTCMay 28, 09:25 UTC30m
2026-05-28 PTA6703 YNY → CJU May 28, 06:35 UTCMay 28, 07:05 UTC30m
2026-05-28 PTA6704 CJU → YNY May 28, 03:55 UTCMay 28, 04:25 UTC30m
2026-05-28 PTA6701 YNY → CJU May 28, 01:40 UTCMay 28, 02:10 UTC30m
2026-05-27 PTA6702 CJU → YNY May 27, 23:45 UTCMay 28, 00:10 UTC25m
2026-05-27 PTA6501 GMP → CJU May 27, 21:25 UTCMay 27, 21:50 UTC25m
2026-05-27 PTA6504 CJU → GMP May 27, 12:50 UTCMay 27, 13:15 UTC25m
2026-05-27 PTA6503 GMP → CJU May 27, 10:25 UTCMay 27, 10:50 UTC25m
2026-05-27 PTA6502 CJU → GMP May 27, 08:55 UTCMay 27, 09:25 UTC30m
2026-05-27 PTA6703 YNY → CJU May 27, 06:34 UTCMay 27, 07:05 UTC31m
2026-05-27 PTA6704 CJU → YNY May 27, 04:04 UTCMay 27, 04:30 UTC25m
2026-05-26 PTA6501 GMP → CJU May 26, 21:20 UTCMay 26, 21:44 UTC25m
2026-05-26 PTA6504 CJU → GMP May 26, 13:15 UTCMay 26, 13:50 UTC35m
2026-05-26 PTA6503 GMP → CJU May 26, 10:50 UTCMay 26, 11:15 UTC25m
2026-05-26 PTA6502 CJU → GMP May 26, 08:59 UTCMay 26, 09:35 UTC35m
2026-05-26 PTA6703 YNY → CJU May 26, 06:25 UTCMay 26, 06:54 UTC30m
2026-05-26 PTA6704 CJU → YNY May 26, 03:50 UTCMay 26, 04:15 UTC25m
2026-05-26 PTA6701 YNY → CJU May 26, 01:24 UTCMay 26, 01:55 UTC30m
2026-05-25 PTA6702 CJU → YNY May 25, 23:35 UTCMay 26, 00:00 UTC25m
2026-05-25 PTA6501 GMP → CJU May 25, 21:15 UTCMay 25, 21:40 UTC25m
2026-05-25 PTA6504 CJU → GMP May 25, 12:50 UTCMay 25, 13:20 UTC30m
2026-05-25 PTA6503 GMP → CJU May 25, 10:30 UTCMay 25, 10:55 UTC25m
2026-05-25 PTA6502 CJU → GMP May 25, 08:40 UTCMay 25, 09:15 UTC35m
2026-05-25 PTA6703 YNY → CJU May 25, 06:25 UTCMay 25, 06:55 UTC30m
2026-05-24 PTA6704 CJU → YNY May 24, 23:30 UTCMay 25, 04:35 UTC5h 5m
2026-05-24 PTA6501 GMP → CJU May 24, 21:05 UTCMay 24, 21:30 UTC25m
2026-05-24 PTA6504 CJU → GMP May 24, 12:50 UTCMay 24, 13:20 UTC30m
2026-05-24 PTA6503 GMP → CJU May 24, 10:30 UTCMay 24, 10:55 UTC25m
2026-05-24 PTA6502 CJU → GMP May 24, 08:45 UTCMay 24, 09:15 UTC30m
2026-05-24 PTA6703 YNY → CJU May 24, 06:20 UTCMay 24, 06:50 UTC30m
2026-05-24 PTA6704 CJU → YNY May 24, 04:00 UTCMay 24, 04:25 UTC25m
2026-05-24 PTA6701 YNY → CJU May 24, 01:25 UTCMay 24, 01:55 UTC30m
2026-05-23 PTA6702 CJU → YNY May 23, 23:30 UTCMay 23, 23:55 UTC25m
2026-05-23 PTA6501 GMP → CJU May 23, 21:15 UTCMay 23, 21:40 UTC25m
2026-05-23 PTA6504 CJU → GMP May 23, 12:40 UTCMay 23, 13:15 UTC35m
2026-05-23 PTA6503 GMP → CJU May 23, 10:25 UTCMay 23, 10:45 UTC20m
2026-05-23 PTA6502 CJU → GMP May 23, 08:45 UTCMay 23, 09:20 UTC35m
2026-05-23 PTA6703 YNY → CJU May 23, 06:25 UTCMay 23, 06:55 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 HL8741 page for operator, model, and routing details .

Mode-S 71C741 frequently asked

What is Mode-S code 71C741?
71C741 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8741.
Where is Mode-S 71C741 registered?
Mode-S code 71C741 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 71C741 broadcasting right now?
Mode-S 71C741 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C741, octal 34343501, decimal 7,456,577.
What flights does 71C741 operate?
Mode-S 71C741 has broadcast 12 distinct callsigns, including PTA6502, PTA6504, PTA6704, PTA6503, PTA6703.