Apparatus

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sensors Mode-S transponder

71C278

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

Currently assigned to HL8278 · AIRBUS A-321

Hex
71C278
Octal
34341170
Decimal
7,455,352
Country
KR
Tail
HL8278
Type
A321
No current signal · last broadcast Jul 23, 23:10 UTC
Flights observed
687
Distinct callsigns
20
Country
KR
Last broadcast
Jul 23, 23:10 UTC

Last known position

Most recent position reported by Mode-S 71C278.

Country allocation

The ICAO 24-bit address 71C278 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
AAR8994 Asiana Airlines 18 2026-07-17
AAR8993 - 18 2026-07-18
AAR8948 Asiana Airlines 17 2026-07-18
AAR8902 - 17 2026-07-20
AAR8736 - 17 2026-07-18
AAR8735 - 17 2026-07-18
AAR8238 - 17 2026-07-20
AAR8996 Asiana Airlines 16 2026-07-21
AAR8981 - 16 2026-07-13
AAR8935 - 16 2026-07-16
AAR8733 - 16 2026-07-15
AAR8956 - 15 2026-07-13
AAR8953 - 15 2026-07-20
AAR8927 - 15 2026-07-20
AAR8921 - 15 2026-07-16
AAR8900 - 15 2026-07-16
AAR8734 - 15 2026-07-15
AAR8239 Asiana Airlines 15 2026-07-20
AAR8235 - 15 2026-07-20
AAR8234 Asiana Airlines 15 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 AAR802A GMP → ICN Jul 23, 22:40 UTCJul 23, 23:00 UTC20m
2026-07-23 AAR3365 PEK → GMP Jul 23, 11:15 UTCJul 23, 11:35 UTC20m
2026-07-23 AAR3355 GMP → PEK Jul 23, 06:35 UTCJul 23, 07:05 UTC30m
2026-07-23 AAR1135 KIX → GMP Jul 23, 02:25 UTCJul 23, 03:45 UTC1h 20m
2026-07-22 AAR1145 GMP → KIX Jul 22, 23:25 UTCJul 23, 00:45 UTC1h 20m
2026-07-22 AAR3365 PEK → GMP Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 AAR1135 KIX → GMP Jul 22, 02:30 UTCJul 22, 03:45 UTC1h 15m
2026-07-21 AAR1145 GMP → KIX Jul 21, 23:25 UTCJul 22, 00:50 UTC1h 25m
2026-07-21 AAR8996 CJU → GMP Jul 21, 12:30 UTCJul 21, 13:10 UTC40m
2026-07-21 AAR8127 - Jul 21, 10:35 UTCJul 21, 10:55 UTC20m
2026-07-21 AAR8126 - Jul 21, 08:55 UTCJul 21, 09:35 UTC40m
2026-07-21 AAR8949 GMP → CJU Jul 21, 03:45 UTCJul 21, 04:20 UTC35m
2026-07-21 AAR8920 CJU → GMP Jul 21, 01:45 UTCJul 21, 02:30 UTC45m
2026-07-20 AAR8927 - Jul 20, 23:40 UTCJul 21, 00:15 UTC35m
2026-07-20 AAR8902 - Jul 20, 21:55 UTCJul 20, 22:35 UTC40m
2026-07-20 AAR8239 CJJ → CJU Jul 20, 12:25 UTCJul 20, 13:00 UTC35m
2026-07-20 AAR8238 - Jul 20, 10:35 UTCJul 20, 11:05 UTC30m
2026-07-20 AAR8235 - Jul 20, 08:25 UTCJul 20, 09:00 UTC35m
2026-07-20 AAR8234 CJU → CJJ Jul 20, 06:50 UTCJul 20, 07:20 UTC30m
2026-07-20 AAR8953 - Jul 20, 04:40 UTCJul 20, 05:15 UTC35m
2026-07-20 AAR8704 KWJ → GMP Jul 20, 02:20 UTCJul 20, 02:55 UTC35m
2026-07-20 AAR8703 GMP → KWJ Jul 20, 00:45 UTCJul 20, 01:15 UTC30m
2026-07-19 AAR8904 - Jul 19, 22:35 UTCJul 19, 23:20 UTC45m
2026-07-19 AAR8239 CJJ → CJU Jul 19, 12:15 UTCJul 19, 12:40 UTC25m
2026-07-19 AAR8238 - Jul 19, 10:30 UTCJul 19, 11:05 UTC35m
2026-07-19 AAR8235 - Jul 19, 08:25 UTCJul 19, 08:50 UTC25m
2026-07-19 AAR8234 - Jul 19, 06:50 UTCJul 19, 07:20 UTC30m
2026-07-19 AAR8953 - Jul 19, 04:45 UTCJul 19, 05:15 UTC30m
2026-07-19 AAR8704 - Jul 19, 02:20 UTCJul 19, 03:00 UTC40m
2026-07-19 AAR8703 - Jul 19, 00:40 UTCJul 19, 01:10 UTC30m
2026-07-18 AAR8904 - Jul 18, 22:30 UTCJul 18, 23:10 UTC40m
2026-07-18 AAR8993 - Jul 18, 11:55 UTCJul 18, 12:30 UTC35m
2026-07-18 AAR8736 - Jul 18, 09:50 UTCJul 18, 10:20 UTC30m
2026-07-18 AAR8735 - Jul 18, 08:10 UTCJul 18, 08:40 UTC30m
2026-07-18 AAR8948 CJU → GMP Jul 18, 06:10 UTCJul 18, 06:50 UTC40m
2026-07-18 AAR8143 - Jul 18, 04:30 UTCJul 18, 04:40 UTC10m
2026-07-18 AAR8142 - Jul 18, 03:05 UTCJul 18, 03:15 UTC10m
2026-07-18 AAR8141 - Jul 18, 01:10 UTCJul 18, 01:20 UTC10m
2026-07-18 AAR8140 - Jul 18, 00:04 UTCJul 18, 00:19 UTC15m
2026-07-17 AAR8913 - Jul 17, 22:00 UTCJul 17, 22:35 UTC35m
2026-07-17 AAR8994 CJU → GMP Jul 17, 12:35 UTCJul 17, 13:10 UTC35m
2026-07-17 AAR8985 - Jul 17, 10:20 UTCJul 17, 11:04 UTC45m
2026-07-17 AAR8708 - Jul 17, 08:25 UTCJul 17, 08:54 UTC30m
2026-07-17 AAR8707 - Jul 17, 06:54 UTCJul 17, 07:20 UTC25m
2026-07-17 AAR8936 - Jul 17, 05:15 UTCJul 17, 05:50 UTC35m
2026-07-16 AAR8921 - Jul 16, 23:29 UTCJul 17, 00:04 UTC35m
2026-07-16 AAR8900 - Jul 16, 21:50 UTCJul 16, 22:25 UTC35m
2026-07-16 AAR8147 - Jul 16, 09:20 UTCJul 16, 09:35 UTC15m
2026-07-16 AAR8146 - Jul 16, 08:05 UTCJul 16, 08:15 UTC10m
2026-07-16 AAR8145 - Jul 16, 06:00 UTCJul 16, 06:15 UTC15m

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 HL8278 page for operator, model, and routing details .

Mode-S 71C278 frequently asked

What is Mode-S code 71C278?
71C278 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8278.
Where is Mode-S 71C278 registered?
Mode-S code 71C278 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 71C278 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 23:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C278, octal 34341170, decimal 7,455,352.
What flights does 71C278 operate?
Mode-S 71C278 has broadcast 20 distinct callsigns, including AAR8994, AAR8993, AAR8948, AAR8902, AAR8736.