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 Jul 26, 10:35 UTC
Flights observed
506
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 10:35 UTC

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
AAR8708 Asiana Airlines 20 2026-07-25
AAR8985 Asiana Airlines 19 2026-07-25
AAR8936 Asiana Airlines 19 2026-07-25
AAR8707 Asiana Airlines 18 2026-07-25
AAR8900 Asiana Airlines 17 2026-07-23
AAR8736 Asiana Airlines 16 2026-07-21
AAR8993 Asiana Airlines 14 2026-07-21
AAR8948 Asiana Airlines 14 2026-07-21
AAR8921 Asiana Airlines 14 2026-07-23
AAR8735 Asiana Airlines 14 2026-07-21
AAR8996 Asiana Airlines 13 2026-07-20
AAR8127 - 13 2026-07-26
AAR8980 Asiana Airlines 12 2026-05-14
AAR8902 Asiana Airlines 12 2026-07-25
AAR8995 - 11 2026-07-22
AAR8949 Asiana Airlines 11 2026-07-26
AAR8941 Asiana Airlines 11 2026-05-14
AAR8981 Asiana Airlines 10 2026-07-23
AAR8973 Asiana Airlines 10 2026-05-14
AAR8942 Asiana Airlines 10 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAR8127 - Jul 26, 10:20 UTCJul 26, 10:35 UTC15m
2026-07-26 AAR8126 CJU → TAE Jul 26, 09:00 UTCJul 26, 09:20 UTC20m
2026-07-26 AAR8949 GMP → CJU Jul 26, 03:50 UTCJul 26, 04:25 UTC35m
2026-07-25 AAR8902 CJU → GMP Jul 25, 21:55 UTCJul 25, 22:40 UTC45m
2026-07-25 AAR8985 GMP → CJU Jul 25, 10:20 UTCJul 25, 11:00 UTC40m
2026-07-25 AAR8708 KWJ → GMP Jul 25, 08:20 UTCJul 25, 09:00 UTC40m
2026-07-25 AAR8707 GMP → KWJ Jul 25, 06:55 UTCJul 25, 07:15 UTC20m
2026-07-25 AAR8936 CJU → GMP Jul 25, 05:10 UTCJul 25, 05:50 UTC40m
2026-07-24 AAR8985 GMP → CJU Jul 24, 10:25 UTCJul 24, 11:00 UTC35m
2026-07-24 AAR8708 KWJ → GMP Jul 24, 08:25 UTCJul 24, 09:05 UTC40m
2026-07-24 AAR8707 GMP → KWJ Jul 24, 07:05 UTCJul 24, 07:35 UTC30m
2026-07-24 AAR8936 CJU → GMP Jul 24, 05:20 UTCJul 24, 06:00 UTC40m
2026-07-23 AAR8921 GMP → CJU Jul 23, 23:35 UTCJul 24, 00:10 UTC35m
2026-07-23 AAR8900 CJU → GMP Jul 23, 21:50 UTCJul 23, 22:30 UTC40m
2026-07-23 AAR8981 GMP → CJU Jul 23, 09:00 UTCJul 23, 09:35 UTC35m
2026-07-23 AAR8956 CJU → GMP Jul 23, 07:25 UTCJul 23, 08:05 UTC40m
2026-07-23 AAR8233 CJJ → CJU Jul 23, 04:35 UTCJul 23, 05:05 UTC30m
2026-07-23 AAR8232 CJU → CJJ Jul 23, 03:05 UTCJul 23, 03:35 UTC30m
2026-07-22 AAR8995 - Jul 22, 12:30 UTCJul 22, 13:05 UTC35m
2026-07-22 AAR8986 CJU → GMP Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 AAR8233 CJJ → CJU Jul 22, 04:25 UTCJul 22, 04:55 UTC30m
2026-07-22 AAR8232 CJU → CJJ Jul 22, 02:40 UTCJul 22, 03:10 UTC30m
2026-07-22 AAR8123 - Jul 22, 00:45 UTCJul 22, 01:05 UTC20m
2026-07-21 AAR8122 CJU → TAE Jul 21, 23:25 UTCJul 21, 23:40 UTC15m
2026-07-21 AAR8993 GMP → CJU Jul 21, 12:00 UTCJul 21, 12:35 UTC35m
2026-07-21 AAR8736 RSU → GMP Jul 21, 09:35 UTCJul 21, 10:15 UTC40m
2026-07-21 AAR8735 GMP → RSU Jul 21, 07:55 UTCJul 21, 08:30 UTC35m
2026-07-21 AAR8948 CJU → GMP Jul 21, 06:00 UTCJul 21, 06:40 UTC40m
2026-07-21 AAR8143 KWJ → CJU Jul 21, 04:10 UTCJul 21, 04:20 UTC10m
2026-07-21 AAR8142 CJU → KWJ Jul 21, 02:55 UTCJul 21, 03:10 UTC15m
2026-07-21 AAR8141 KWJ → CJU Jul 21, 01:15 UTCJul 21, 01:25 UTC10m
2026-07-21 AAR8140 CJU → KWJ Jul 21, 00:00 UTCJul 21, 00:15 UTC15m
2026-07-20 AAR8913 - Jul 20, 22:00 UTCJul 20, 22:30 UTC30m
2026-07-20 AAR8996 CJU → GMP Jul 20, 13:05 UTCJul 20, 13:45 UTC40m
2026-07-20 AAR8127 - Jul 20, 10:55 UTCJul 20, 11:15 UTC20m
2026-07-20 AAR8126 - Jul 20, 09:00 UTCJul 20, 09:25 UTC25m
2026-07-20 AAR8949 GMP → CJU Jul 20, 03:45 UTCJul 20, 04:20 UTC35m
2026-07-20 AAR8920 CJU → GMP Jul 20, 02:05 UTCJul 20, 02:35 UTC30m
2026-07-19 AAR8927 - Jul 19, 23:40 UTCJul 20, 00:15 UTC35m
2026-07-19 AAR8902 - Jul 19, 21:55 UTCJul 19, 22:35 UTC40m
2026-07-19 AAR8985 - Jul 19, 10:25 UTCJul 19, 11:00 UTC35m
2026-07-19 AAR8708 - Jul 19, 08:30 UTCJul 19, 09:05 UTC35m
2026-07-19 AAR8707 - Jul 19, 07:00 UTCJul 19, 07:20 UTC20m
2026-07-19 AAR8936 - Jul 19, 05:15 UTCJul 19, 05:50 UTC35m
2026-07-18 AAR8921 - Jul 18, 23:50 UTCJul 19, 00:20 UTC30m
2026-07-18 AAR8900 - Jul 18, 21:50 UTCJul 18, 22:35 UTC45m
2026-07-18 AAR8985 - Jul 18, 10:15 UTCJul 18, 10:55 UTC40m
2026-07-18 AAR8708 KWJ → GMP Jul 18, 08:25 UTCJul 18, 09:05 UTC40m
2026-07-18 AAR8707 - Jul 18, 07:05 UTCJul 18, 07:30 UTC25m
2026-07-18 AAR8936 - Jul 18, 05:25 UTCJul 18, 06:10 UTC45m

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 Jul 26, 10:35 UTC.
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 AAR8708, AAR8985, AAR8936, AAR8707, AAR8900.