Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C277

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

Currently assigned to HL8277 · AIRBUS A-321

Hex
71C277
Octal
34341167
Decimal
7,455,351
Country
KR
Tail
HL8277
Type
A321
No current signal · last broadcast 10h ago
Flights observed
188
Distinct callsigns
20
Country
KR
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 71C277.

Country allocation

The ICAO 24-bit address 71C277 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
AAR8980 Asiana Airlines 12 2026-05-14
AAR8941 Asiana Airlines 11 2026-05-14
AAR8973 Asiana Airlines 10 2026-05-14
AAR8942 Asiana Airlines 10 2026-05-14
AAR8708 Asiana Airlines 9 2026-05-29
AAR8936 Asiana Airlines 8 2026-05-29
AAR8913 Asiana Airlines 8 2026-05-13
AAR8900 Asiana Airlines 8 2026-05-29
AAR8985 Asiana Airlines 7 2026-05-28
AAR8914 Asiana Airlines 7 2026-05-14
AAR8707 Asiana Airlines 7 2026-05-28
AAR8948 Asiana Airlines 6 2026-05-27
AAR8921 Asiana Airlines 6 2026-05-29
AAR8736 Asiana Airlines 6 2026-05-27
AAR8993 Asiana Airlines 5 2026-05-27
AAR8735 Asiana Airlines 5 2026-05-26
AAR8996 Asiana Airlines 4 2026-05-25
AAR8902 Asiana Airlines 4 2026-05-19
AAR8127 - 4 2026-05-25
AAR8995 Asiana Airlines 3 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AAR8921 GMP → CJU May 29, 23:40 UTCMay 30, 00:05 UTC25m
2026-05-29 AAR8900 CJU → GMP May 29, 22:00 UTCMay 29, 22:35 UTC35m
2026-05-29 AAR8708 KWJ → GMP May 29, 08:40 UTCMay 29, 09:10 UTC30m
2026-05-29 AAR8936 CJU → GMP May 29, 05:15 UTCMay 29, 05:50 UTC35m
2026-05-28 AAR8900 CJU → GMP May 28, 22:10 UTCMay 28, 22:30 UTC20m
2026-05-28 AAR8985 GMP → CJU May 28, 10:35 UTCMay 28, 10:55 UTC20m
2026-05-28 AAR8708 KWJ → GMP May 28, 08:30 UTCMay 28, 09:00 UTC30m
2026-05-28 AAR8707 GMP → KWJ May 28, 06:50 UTCMay 28, 07:15 UTC25m
2026-05-28 AAR8936 CJU → GMP May 28, 05:25 UTCMay 28, 06:00 UTC35m
2026-05-27 AAR8921 GMP → CJU May 27, 23:35 UTCMay 28, 00:00 UTC25m
2026-05-27 AAR8900 CJU → GMP May 27, 22:00 UTCMay 27, 22:30 UTC30m
2026-05-27 AAR8993 GMP → CJU May 27, 12:10 UTCMay 27, 12:20 UTC10m
2026-05-27 AAR8736 RSU → GMP May 27, 09:40 UTCMay 27, 10:15 UTC35m
2026-05-27 AAR8948 CJU → GMP May 27, 06:04 UTCMay 27, 06:44 UTC40m
2026-05-26 AAR8736 RSU → GMP May 26, 10:34 UTCMay 26, 11:20 UTC45m
2026-05-26 AAR8735 GMP → RSU May 26, 08:59 UTCMay 26, 09:29 UTC30m
2026-05-26 AAR8948 CJU → GMP May 26, 06:59 UTCMay 26, 07:24 UTC25m
2026-05-25 AAR8996 CJU → GMP May 25, 12:35 UTCMay 25, 13:00 UTC25m
2026-05-25 AAR8127 - May 25, 10:25 UTCMay 25, 10:35 UTC10m
2026-05-25 AAR8949 GMP → CJU May 25, 03:40 UTCMay 25, 04:05 UTC25m
2026-05-24 AAR8239 CJJ → CJU May 24, 12:15 UTCMay 24, 12:35 UTC20m
2026-05-24 AAR8235 CJJ → CJU May 24, 08:25 UTCMay 24, 08:40 UTC15m
2026-05-24 AAR8953 GMP → CJU May 24, 04:40 UTCMay 24, 05:05 UTC25m
2026-05-24 AAR8704 KWJ → GMP May 24, 02:20 UTCMay 24, 02:45 UTC25m
2026-05-24 AAR8703 GMP → KWJ May 24, 00:50 UTCMay 24, 01:10 UTC20m
2026-05-23 AAR8904 CJU → GMP May 23, 22:40 UTCMay 23, 23:15 UTC35m
2026-05-23 AAR8708 KWJ → GMP May 23, 08:50 UTCMay 23, 09:00 UTC10m
2026-05-22 AAR8985 GMP → CJU May 22, 10:45 UTCMay 22, 11:05 UTC20m
2026-05-22 AAR8708 KWJ → GMP May 22, 09:00 UTCMay 22, 09:40 UTC40m
2026-05-22 AAR8707 GMP → KWJ May 22, 07:25 UTCMay 22, 07:50 UTC25m
2026-05-22 AAR8936 CJU → GMP May 22, 05:40 UTCMay 22, 06:15 UTC35m
2026-05-21 AAR8993 GMP → CJU May 21, 12:00 UTCMay 21, 12:20 UTC20m
2026-05-21 AAR8736 RSU → GMP May 21, 09:35 UTCMay 21, 10:10 UTC35m
2026-05-21 AAR8735 GMP → RSU May 21, 07:55 UTCMay 21, 08:15 UTC20m
2026-05-21 AAR8948 CJU → GMP May 21, 06:10 UTCMay 21, 06:45 UTC35m
2026-05-20 AAR8901 GMP → CJU May 20, 22:00 UTCMay 20, 22:25 UTC25m
2026-05-20 AAR8996 CJU → GMP May 20, 12:30 UTCMay 20, 13:05 UTC35m
2026-05-20 AAR8127 - May 20, 10:15 UTCMay 20, 10:25 UTC10m
2026-05-20 AAR8126 CJU → TAE May 20, 09:05 UTCMay 20, 09:20 UTC15m
2026-05-20 AAR8949 GMP → CJU May 20, 03:50 UTCMay 20, 04:15 UTC25m
2026-05-20 AAR8920 CJU → GMP May 20, 01:50 UTCMay 20, 02:25 UTC35m
2026-05-19 AAR8927 GMP → CJU May 19, 23:45 UTCMay 20, 00:10 UTC25m
2026-05-19 AAR8902 CJU → GMP May 19, 22:05 UTCMay 19, 22:45 UTC40m
2026-05-19 AAR8985 GMP → CJU May 19, 10:35 UTCMay 19, 11:05 UTC30m
2026-05-19 AAR8936 CJU → GMP May 19, 05:10 UTCMay 19, 05:40 UTC30m
2026-05-18 AAR8921 GMP → CJU May 18, 23:35 UTCMay 19, 00:00 UTC25m
2026-05-18 AAR8900 CJU → GMP May 18, 22:00 UTCMay 18, 22:30 UTC30m
2026-05-18 AAR8985 GMP → CJU May 18, 10:35 UTCMay 18, 11:00 UTC25m
2026-05-18 AAR8708 KWJ → GMP May 18, 08:25 UTCMay 18, 08:50 UTC25m
2026-05-18 AAR8707 GMP → KWJ May 18, 07:00 UTCMay 18, 07:25 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 HL8277 page for operator, model, and routing details .

Mode-S 71C277 frequently asked

What is Mode-S code 71C277?
71C277 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8277.
Where is Mode-S 71C277 registered?
Mode-S code 71C277 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 71C277 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C277, octal 34341167, decimal 7,455,351.
What flights does 71C277 operate?
Mode-S 71C277 has broadcast 20 distinct callsigns, including AAR8980, AAR8941, AAR8973, AAR8942, AAR8708.