Apparatus

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sensors Mode-S transponder

71C018

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

Currently assigned to HL8018 · AIRBUS A-321

Hex
71C018
Octal
34340030
Decimal
7,454,744
Country
KR
Tail
HL8018
Type
A321
No current signal · last broadcast 2h ago
Flights observed
619
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C018.

Country allocation

The ICAO 24-bit address 71C018 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
AAR8904 - 34 2026-07-12
AAR8704 - 33 2026-07-13
AAR8703 - 33 2026-07-13
AAR8953 - 32 2026-07-12
AAR8235 - 31 2026-07-12
AAR8239 - 30 2026-07-11
AAR8238 - 30 2026-07-11
AAR8234 - 30 2026-07-12
AAR8948 - 16 2026-07-10
AAR8949 - 15 2026-07-13
AAR8736 - 15 2026-07-10
AAR8735 - 15 2026-07-10
AAR8996 - 14 2026-07-09
AAR8902 - 14 2026-07-08
AAR8993 - 13 2026-07-10
AAR8935 - 13 2026-07-14
AAR8927 - 13 2026-07-09
AAR8920 - 13 2026-07-09
AAR8901 Asiana Airlines 13 2026-06-28
AAR8734 - 13 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAR8146 - Jul 14, 09:15 UTCJul 14, 09:30 UTC15m
2026-07-14 AAR8145 - Jul 14, 07:25 UTCJul 14, 07:35 UTC10m
2026-07-14 AAR8144 - Jul 14, 04:35 UTCJul 14, 04:50 UTC15m
2026-07-14 AAR8935 - Jul 14, 02:00 UTCJul 14, 02:40 UTC40m
2026-07-14 AAR8734 - Jul 14, 00:00 UTCJul 14, 00:40 UTC40m
2026-07-13 AAR8733 - Jul 13, 22:25 UTCJul 13, 22:55 UTC30m
2026-07-13 AAR801A ICN → GMP Jul 13, 21:05 UTCJul 13, 21:15 UTC10m
2026-07-13 AAR8496 - Jul 13, 14:25 UTCJul 13, 15:05 UTC40m
2026-07-13 AAR8199 - Jul 13, 12:35 UTCJul 13, 12:45 UTC10m
2026-07-13 AAR8199 - Jul 13, 09:40 UTCJul 13, 09:50 UTC10m
2026-07-13 AAR8949 - Jul 13, 04:25 UTCJul 13, 05:05 UTC40m
2026-07-13 AAR8704 - Jul 13, 02:50 UTCJul 13, 03:30 UTC40m
2026-07-13 AAR8703 - Jul 13, 01:10 UTCJul 13, 01:40 UTC30m
2026-07-12 AAR8904 - Jul 12, 23:15 UTCJul 12, 23:55 UTC40m
2026-07-12 AAR8411 - Jul 12, 21:15 UTCJul 12, 21:50 UTC35m
2026-07-12 AAR8986 - Jul 12, 13:15 UTCJul 12, 13:45 UTC30m
2026-07-12 AAR8235 - Jul 12, 10:55 UTCJul 12, 11:25 UTC30m
2026-07-12 AAR8234 - Jul 12, 09:25 UTCJul 12, 09:55 UTC30m
2026-07-12 AAR8953 - Jul 12, 06:50 UTCJul 12, 07:25 UTC35m
2026-07-12 AAR8704 - Jul 12, 04:55 UTCJul 12, 05:35 UTC40m
2026-07-12 AAR8703 - Jul 12, 03:40 UTCJul 12, 04:10 UTC30m
2026-07-12 AAR8904 - Jul 12, 01:25 UTCJul 12, 02:05 UTC40m
2026-07-11 AAR8239 - Jul 11, 13:15 UTCJul 11, 13:50 UTC35m
2026-07-11 AAR8238 - Jul 11, 11:50 UTCJul 11, 12:20 UTC30m
2026-07-11 AAR8235 - Jul 11, 08:55 UTCJul 11, 09:25 UTC30m
2026-07-11 AAR8234 - Jul 11, 07:30 UTCJul 11, 07:55 UTC25m
2026-07-11 AAR8953 - Jul 11, 04:35 UTCJul 11, 05:20 UTC45m
2026-07-11 AAR8704 - Jul 11, 02:10 UTCJul 11, 02:50 UTC40m
2026-07-11 AAR8703 - Jul 11, 00:45 UTCJul 11, 01:05 UTC20m
2026-07-10 AAR8904 - Jul 10, 22:30 UTCJul 10, 23:10 UTC40m
2026-07-10 AAR8993 - Jul 10, 12:00 UTCJul 10, 12:35 UTC35m
2026-07-10 AAR8736 - Jul 10, 09:40 UTCJul 10, 10:25 UTC45m
2026-07-10 AAR8735 - Jul 10, 07:55 UTCJul 10, 08:25 UTC30m
2026-07-10 AAR8948 - Jul 10, 05:55 UTCJul 10, 06:40 UTC45m
2026-07-10 AAR8143 - Jul 10, 04:05 UTCJul 10, 04:15 UTC10m
2026-07-10 AAR8141 - Jul 10, 01:15 UTCJul 10, 01:25 UTC10m
2026-07-09 AAR8140 - Jul 9, 23:55 UTCJul 10, 00:10 UTC15m
2026-07-09 AAR8913 - Jul 9, 21:55 UTCJul 9, 22:30 UTC35m
2026-07-09 AAR8996 - Jul 9, 13:00 UTCJul 9, 13:35 UTC35m
2026-07-09 AAR8127 - Jul 9, 10:45 UTCJul 9, 11:10 UTC25m
2026-07-09 AAR8126 - Jul 9, 09:35 UTCJul 9, 09:50 UTC15m
2026-07-09 AAR8949 - Jul 9, 04:45 UTCJul 9, 05:20 UTC35m
2026-07-09 AAR8920 - Jul 9, 02:30 UTCJul 9, 03:25 UTC55m
2026-07-09 AAR8927 - Jul 9, 00:00 UTCJul 9, 00:40 UTC40m
2026-07-08 AAR8902 - Jul 8, 21:55 UTCJul 8, 22:40 UTC45m
2026-07-08 AAR8239 - Jul 8, 12:20 UTCJul 8, 12:45 UTC25m
2026-07-08 AAR8238 - Jul 8, 10:25 UTCJul 8, 11:00 UTC35m
2026-07-08 AAR8235 - Jul 8, 08:25 UTCJul 8, 08:55 UTC30m
2026-07-08 AAR8234 - Jul 8, 06:50 UTCJul 8, 07:20 UTC30m
2026-07-08 AAR8953 - Jul 8, 04:40 UTCJul 8, 05:20 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 HL8018 page for operator, model, and routing details .

Mode-S 71C018 frequently asked

What is Mode-S code 71C018?
71C018 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8018.
Where is Mode-S 71C018 registered?
Mode-S code 71C018 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 71C018 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C018, octal 34340030, decimal 7,454,744.
What flights does 71C018 operate?
Mode-S 71C018 has broadcast 20 distinct callsigns, including AAR8904, AAR8704, AAR8703, AAR8953, AAR8235.