Apparatus

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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
Broadcasting now · callsign PTA6704 · 27,000 ft
Flights observed
139
Distinct callsigns
8
Country
KR
Last broadcast
2h ago

Current position

71C742 is currently broadcasting. Map zoomed to live position.

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 8 distinct

Callsign Airline Flights Last seen
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
PTA6702 Ptarmigan Airways 1 2026-05-29
PTA6701 Ptarmigan Airways 1 2026-05-30
PTA6501 Ptarmigan Airways 1 2026-05-29
PTA601P Ptarmigan Airways 1 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 PTA6701 YNY → CJU May 30, 01:35 UTCMay 30, 02:06 UTC31m
2026-05-29 PTA6702 CJU → YNY May 29, 23:25 UTCMay 29, 23:50 UTC25m
2026-05-29 PTA6501 GMP → CJU May 29, 21:10 UTCMay 29, 21:35 UTC25m
2026-05-29 PTA601P ICN → GMP May 29, 10:05 UTCMay 29, 10:30 UTC25m
2026-05-29 PTA512 KIX → ICN May 29, 06:15 UTCMay 29, 07:45 UTC1h 30m
2026-05-29 PTA511 ICN → KIX May 29, 02:25 UTCMay 29, 03:45 UTC1h 20m
2026-05-28 PTA205 ICN → CXR May 28, 09:50 UTCMay 28, 21:00 UTC11h 10m
2026-05-28 PTA512 KIX → ICN May 28, 06:20 UTCMay 28, 07:50 UTC1h 30m
2026-05-28 PTA511 ICN → KIX May 28, 02:30 UTCMay 28, 03:50 UTC1h 20m
2026-05-27 PTA206 CXR → ICN May 27, 09:55 UTCMay 27, 21:15 UTC11h 20m
2026-05-27 PTA512 KIX → ICN May 27, 06:15 UTCMay 27, 07:40 UTC1h 25m
2026-05-27 PTA511 ICN → KIX May 27, 02:29 UTCMay 27, 03:54 UTC1h 25m
2026-05-27 PTA511 ICN → KIX May 27, 02:14 UTCMay 27, 02:19 UTC5m
2026-05-25 PTA512 KIX → ICN May 25, 06:20 UTCMay 25, 07:40 UTC1h 20m
2026-05-25 PTA511 ICN → KIX May 25, 02:25 UTCMay 25, 03:55 UTC1h 30m
2026-05-24 PTA206 CXR → ICN May 24, 09:55 UTCMay 24, 21:10 UTC11h 15m
2026-05-24 PTA512 KIX → ICN May 24, 06:15 UTCMay 24, 07:35 UTC1h 20m
2026-05-24 PTA511 ICN → KIX May 24, 02:35 UTCMay 24, 03:50 UTC1h 15m
2026-05-24 PTA511 ICN → KIX May 24, 02:25 UTCMay 24, 02:30 UTC5m
2026-05-23 PTA205 ICN → CXR May 23, 10:00 UTCMay 23, 21:00 UTC11h 0m
2026-05-23 PTA512 KIX → ICN May 23, 06:20 UTCMay 23, 07:50 UTC1h 30m
2026-05-23 PTA511 ICN → KIX May 23, 02:25 UTCMay 23, 03:45 UTC1h 19m
2026-05-22 PTA512 KIX → ICN May 22, 06:20 UTCMay 22, 07:45 UTC1h 25m
2026-05-22 PTA511 ICN → KIX May 22, 02:25 UTCMay 22, 03:55 UTC1h 30m
2026-05-21 PTA205 ICN → CXR May 21, 10:00 UTCMay 21, 21:00 UTC11h 0m
2026-05-21 PTA512 KIX → ICN May 21, 06:15 UTCMay 21, 07:35 UTC1h 20m
2026-05-21 PTA511 ICN → KIX May 21, 02:35 UTCMay 21, 04:00 UTC1h 25m
2026-05-20 PTA205 ICN → CXR May 20, 10:10 UTCMay 20, 20:50 UTC10h 40m
2026-05-20 PTA512 KIX → ICN May 20, 06:25 UTCMay 20, 07:55 UTC1h 30m
2026-05-20 PTA511 ICN → KIX May 20, 02:30 UTCMay 20, 03:50 UTC1h 20m
2026-05-19 PTA512 KIX → ICN May 19, 06:20 UTCMay 19, 07:40 UTC1h 20m
2026-05-19 PTA511 ICN → KIX May 19, 02:30 UTCMay 19, 04:05 UTC1h 35m
2026-05-18 PTA512 KIX → ICN May 18, 06:20 UTCMay 18, 07:35 UTC1h 15m
2026-05-18 PTA511 ICN → KIX May 18, 02:30 UTCMay 18, 03:50 UTC1h 20m
2026-05-17 PTA205 ICN → CXR May 17, 09:50 UTCMay 17, 21:20 UTC11h 30m
2026-05-17 PTA512 KIX → ICN May 17, 06:25 UTCMay 17, 07:40 UTC1h 15m
2026-05-17 PTA511 ICN → KIX May 17, 02:25 UTCMay 17, 03:45 UTC1h 20m
2026-05-16 PTA206 CXR → ICN May 16, 10:01 UTCMay 16, 21:00 UTC11h 0m
2026-05-16 PTA512 KIX → ICN May 16, 06:25 UTCMay 16, 07:45 UTC1h 20m
2026-05-16 PTA511 ICN → KIX May 16, 02:25 UTCMay 16, 04:10 UTC1h 45m
2026-05-15 PTA512 KIX → ICN May 15, 06:25 UTCMay 15, 07:40 UTC1h 15m
2026-05-15 PTA511 ICN → KIX May 15, 02:20 UTCMay 15, 03:55 UTC1h 35m
2026-05-14 PTA205 ICN → CXR May 14, 10:05 UTCMay 14, 21:10 UTC11h 5m
2026-05-14 PTA512 KIX → ICN May 14, 06:20 UTCMay 14, 07:40 UTC1h 20m
2026-05-14 PTA511 ICN → KIX May 14, 02:20 UTCMay 14, 03:45 UTC1h 25m
2026-05-13 PTA205 ICN → CXR May 13, 09:55 UTCMay 13, 20:50 UTC10h 55m
2026-05-13 PTA512 KIX → ICN May 13, 06:25 UTCMay 13, 07:45 UTC1h 20m
2026-05-13 PTA511 ICN → KIX May 13, 02:40 UTCMay 13, 04:05 UTC1h 25m
2026-05-12 PTA512 KIX → ICN May 12, 06:25 UTCMay 12, 07:40 UTC1h 15m
2026-05-12 PTA511 ICN → KIX May 12, 02:45 UTCMay 12, 03:55 UTC1h 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 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?
Yes. Mode-S 71C742 is currently airborne.
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 8 distinct callsigns, including PTA512, PTA511, PTA205, PTA206, PTA6702.