Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C742

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

Currently assigned to HL8742 · AIRBUS A-320

Hex
71C742
Octal
34343502
Decimal
7,456,578
Country
KR
Tail
HL8742
Type
A320
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
596
Distinct callsigns
13
Country
KR
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S 71C742.

Country allocation

The ICAO 24-bit address 71C742 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 13 distinct

Callsign Airline Flights Last seen
PTA6501 Ptarmigan Airways 59 2026-07-26
PTA6704 Ptarmigan Airways 58 2026-07-26
PTA6504 Ptarmigan Airways 58 2026-07-26
PTA6702 Ptarmigan Airways 57 2026-07-25
PTA6701 Ptarmigan Airways 57 2026-07-26
PTA6503 Ptarmigan Airways 57 2026-07-26
PTA6502 Ptarmigan Airways 57 2026-07-26
PTA6703 Ptarmigan Airways 55 2026-07-26
PTA512 Ptarmigan Airways 52 2026-05-29
PTA511 Ptarmigan Airways 49 2026-05-29
PTA205 Ptarmigan Airways 24 2026-05-28
PTA206 Ptarmigan Airways 10 2026-05-27
PTA601P - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 PTA6501 GMP → CJU Jul 26, 21:20 UTCJul 26, 21:50 UTC30m
2026-07-26 PTA6504 CJU → GMP Jul 26, 13:05 UTCJul 26, 13:35 UTC30m
2026-07-26 PTA6503 GMP → CJU Jul 26, 10:45 UTCJul 26, 11:20 UTC35m
2026-07-26 PTA6502 CJU → GMP Jul 26, 08:50 UTCJul 26, 09:25 UTC35m
2026-07-26 PTA6703 YNY → CJU Jul 26, 06:30 UTCJul 26, 07:10 UTC41m
2026-07-26 PTA6704 CJU → YNY Jul 26, 03:50 UTCJul 26, 04:25 UTC35m
2026-07-26 PTA6701 YNY → CJU Jul 26, 01:30 UTCJul 26, 02:10 UTC40m
2026-07-25 PTA6702 CJU → YNY Jul 25, 23:20 UTCJul 25, 23:55 UTC35m
2026-07-25 PTA6501 GMP → CJU Jul 25, 21:25 UTCJul 25, 21:55 UTC30m
2026-07-25 PTA6504 CJU → GMP Jul 25, 12:50 UTCJul 25, 13:35 UTC45m
2026-07-25 PTA6503 GMP → CJU Jul 25, 10:25 UTCJul 25, 11:00 UTC35m
2026-07-25 PTA6502 CJU → GMP Jul 25, 08:40 UTCJul 25, 09:30 UTC50m
2026-07-25 PTA6703 YNY → CJU Jul 25, 06:25 UTCJul 25, 07:10 UTC45m
2026-07-25 PTA6704 CJU → YNY Jul 25, 03:45 UTCJul 25, 04:20 UTC35m
2026-07-25 PTA6701 YNY → CJU Jul 25, 01:30 UTCJul 25, 02:10 UTC40m
2026-07-24 PTA6702 CJU → YNY Jul 24, 23:25 UTCJul 24, 23:55 UTC30m
2026-07-24 PTA6501 GMP → CJU Jul 24, 21:20 UTCJul 24, 21:55 UTC35m
2026-07-24 PTA6504 CJU → GMP Jul 24, 12:40 UTCJul 24, 13:20 UTC40m
2026-07-24 PTA6503 GMP → CJU Jul 24, 10:35 UTCJul 24, 11:10 UTC35m
2026-07-24 PTA6502 CJU → GMP Jul 24, 08:45 UTCJul 24, 09:30 UTC45m
2026-07-24 PTA6703 YNY → CJU Jul 24, 06:20 UTCJul 24, 07:00 UTC40m
2026-07-24 PTA6704 CJU → YNY Jul 24, 03:50 UTCJul 24, 04:25 UTC35m
2026-07-24 PTA6701 YNY → CJU Jul 24, 01:30 UTCJul 24, 02:10 UTC40m
2026-07-23 PTA6702 CJU → YNY Jul 23, 23:25 UTCJul 23, 23:55 UTC30m
2026-07-23 PTA6501 GMP → CJU Jul 23, 21:15 UTCJul 23, 21:50 UTC35m
2026-07-23 PTA6504 - Jul 23, 12:40 UTCJul 23, 13:20 UTC40m
2026-07-23 PTA6503 GMP → CJU Jul 23, 10:35 UTCJul 23, 11:15 UTC40m
2026-07-23 PTA6502 CJU → GMP Jul 23, 08:50 UTCJul 23, 09:30 UTC40m
2026-07-23 PTA6703 YNY → CJU Jul 23, 06:30 UTCJul 23, 07:10 UTC40m
2026-07-23 PTA6704 CJU → YNY Jul 23, 04:00 UTCJul 23, 04:30 UTC30m
2026-07-23 PTA6701 YNY → CJU Jul 23, 01:35 UTCJul 23, 02:15 UTC40m
2026-07-22 PTA6702 CJU → YNY Jul 22, 23:25 UTCJul 23, 00:00 UTC35m
2026-07-22 PTA6501 GMP → CJU Jul 22, 21:20 UTCJul 22, 21:55 UTC35m
2026-07-22 PTA6504 - Jul 22, 12:40 UTCJul 22, 13:20 UTC40m
2026-07-22 PTA6704 CJU → YNY Jul 22, 03:45 UTCJul 22, 04:20 UTC35m
2026-07-22 PTA6701 YNY → CJU Jul 22, 01:30 UTCJul 22, 02:10 UTC40m
2026-07-21 PTA6702 CJU → YNY Jul 21, 23:30 UTCJul 22, 00:00 UTC30m
2026-07-21 PTA6501 GMP → CJU Jul 21, 21:20 UTCJul 21, 21:50 UTC30m
2026-07-21 PTA6504 - Jul 21, 13:10 UTCJul 21, 13:55 UTC45m
2026-07-21 PTA6503 GMP → CJU Jul 21, 10:55 UTCJul 21, 11:30 UTC35m
2026-07-21 PTA6502 CJU → GMP Jul 21, 09:00 UTCJul 21, 09:40 UTC40m
2026-07-21 PTA6703 YNY → CJU Jul 21, 06:35 UTCJul 21, 07:15 UTC40m
2026-07-21 PTA6704 CJU → YNY Jul 21, 03:55 UTCJul 21, 04:25 UTC30m
2026-07-21 PTA6701 YNY → CJU Jul 21, 01:25 UTCJul 21, 02:05 UTC40m
2026-07-20 PTA6702 CJU → YNY Jul 20, 23:10 UTCJul 20, 23:45 UTC35m
2026-07-20 PTA6501 GMP → CJU Jul 20, 21:15 UTCJul 20, 21:45 UTC30m
2026-07-20 PTA6504 - Jul 20, 13:00 UTCJul 20, 13:40 UTC40m
2026-07-20 PTA6503 GMP → CJU Jul 20, 10:40 UTCJul 20, 11:15 UTC35m
2026-07-20 PTA6502 CJU → GMP Jul 20, 08:40 UTCJul 20, 09:20 UTC40m
2026-07-20 PTA6703 YNY → CJU Jul 20, 06:25 UTCJul 20, 07:05 UTC40m

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 HL8742 page for operator, model, and routing details .

Mode-S 71C742 frequently asked

What is Mode-S code 71C742?
71C742 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8742.
Where is Mode-S 71C742 registered?
Mode-S code 71C742 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 71C742 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C742, octal 34343502, decimal 7,456,578.
What flights does 71C742 operate?
Mode-S 71C742 has broadcast 13 distinct callsigns, including PTA6501, PTA6704, PTA6504, PTA6702, PTA6701.