Apparatus

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sensors Mode-S transponder

71C505

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

Currently assigned to HL8505 · AIRBUS A-321neo

Hex
71C505
Octal
34342405
Decimal
7,456,005
Country
KR
Tail
HL8505
Type
A21N
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
351
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S 71C505.

Country allocation

The ICAO 24-bit address 71C505 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
KAL2129 Korean Air 25 2026-07-25
KAL2086 Korean Air 25 2026-07-26
KAL2132 Korean Air 22 2026-07-25
KAL2085 Korean Air 22 2026-07-26
KAL2131 Korean Air 21 2026-07-25
KAL2130 Korean Air 20 2026-07-25
KAL1410 Korean Air 20 2026-07-26
KAL1407 Korean Air 20 2026-07-23
KAL856 - 7 2026-07-17
KAL689 Korean Air 7 2026-07-26
KAL744 - 6 2026-07-05
KAL743 - 6 2026-07-04
KAL875 Korean Air 5 2026-07-22
KAL769 Korean Air 5 2026-06-08
KAL1406 Korean Air 5 2026-06-08
KAL876 - 4 2026-07-22
KAL855 - 4 2026-07-17
KAL852 - 4 2026-06-25
KAL770 Korean Air 4 2026-06-08
KAL712 Korean Air 4 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL689 ICN → PNH Jul 26, 10:35 UTCJul 26, 20:40 UTC10h 5m
2026-07-26 KAL1410 PUS → ICN Jul 26, 07:40 UTCJul 26, 08:30 UTC50m
2026-07-26 KAL2086 TPE → PUS Jul 26, 05:35 UTCJul 26, 06:00 UTC25m
2026-07-26 KAL2086 TPE → PUS Jul 26, 04:05 UTCJul 26, 04:35 UTC30m
2026-07-26 KAL2085 PUS → TPE Jul 26, 01:45 UTCJul 26, 02:15 UTC30m
2026-07-26 KAL2085 PUS → TPE Jul 26, 00:20 UTCJul 26, 00:40 UTC20m
2026-07-25 KAL2132 NRT → PUS Jul 25, 10:40 UTCJul 25, 12:25 UTC1h 45m
2026-07-25 KAL2131 PUS → NRT Jul 25, 07:15 UTCJul 25, 09:05 UTC1h 50m
2026-07-25 KAL2130 NRT → PUS Jul 25, 04:00 UTCJul 25, 05:40 UTC1h 40m
2026-07-25 KAL2129 PUS → NRT Jul 25, 00:35 UTCJul 25, 02:20 UTC1h 45m
2026-07-24 KAL2132 NRT → PUS Jul 24, 10:40 UTCJul 24, 12:20 UTC1h 40m
2026-07-24 KAL2131 PUS → NRT Jul 24, 07:15 UTCJul 24, 08:50 UTC1h 35m
2026-07-24 KAL2130 NRT → PUS Jul 24, 04:00 UTCJul 24, 05:40 UTC1h 40m
2026-07-24 KAL2129 PUS → NRT Jul 24, 00:40 UTCJul 24, 02:25 UTC1h 45m
2026-07-23 KAL1407 ICN → PUS Jul 23, 10:10 UTCJul 23, 10:50 UTC40m
2026-07-22 KAL876 - Jul 22, 12:55 UTCJul 22, 13:10 UTC15m
2026-07-22 KAL875 PUS → PVG Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 KAL873 - Jul 22, 04:20 UTCJul 22, 04:50 UTC30m
2026-07-21 KAL656 BKK → ICN Jul 21, 20:15 UTCJul 22, 01:30 UTC5h 15m
2026-07-21 KAL655 - Jul 21, 12:40 UTCJul 21, 17:50 UTC5h 10m
2026-07-21 KAL712 NRT → ICN Jul 21, 08:55 UTCJul 21, 10:55 UTC2h 0m
2026-07-21 KAL711 ICN → NRT Jul 21, 04:15 UTCJul 21, 06:20 UTC2h 5m
2026-07-20 KAL486 PQC → ICN Jul 20, 10:25 UTCJul 20, 22:45 UTC12h 20m
2026-07-20 KAL1410 PUS → ICN Jul 20, 07:40 UTCJul 20, 08:30 UTC50m
2026-07-20 KAL2086 TPE → PUS Jul 20, 05:55 UTCJul 20, 06:25 UTC30m
2026-07-20 KAL2086 TPE → PUS Jul 20, 04:25 UTCJul 20, 04:55 UTC30m
2026-07-20 KAL2085 PUS → TPE Jul 20, 02:05 UTCJul 20, 02:25 UTC20m
2026-07-20 KAL2085 PUS → TPE Jul 20, 00:30 UTCJul 20, 00:55 UTC25m
2026-07-19 KAL2132 - Jul 19, 10:40 UTCJul 19, 12:25 UTC1h 45m
2026-07-19 KAL2131 PUS → NRT Jul 19, 07:05 UTCJul 19, 08:50 UTC1h 45m
2026-07-19 KAL2130 NRT → PUS Jul 19, 03:50 UTCJul 19, 05:30 UTC1h 40m
2026-07-19 KAL2129 PUS → NRT Jul 19, 00:30 UTCJul 19, 02:10 UTC1h 40m
2026-07-18 KAL1407 ICN → PUS Jul 18, 09:35 UTCJul 18, 10:20 UTC45m
2026-07-17 KAL876 - Jul 17, 13:00 UTCJul 17, 13:29 UTC30m
2026-07-17 KAL875 - Jul 17, 09:55 UTCJul 17, 10:20 UTC25m
2026-07-17 KAL856 - Jul 17, 06:50 UTCJul 17, 07:14 UTC25m
2026-07-17 KAL855 - Jul 17, 02:10 UTCJul 17, 02:34 UTC25m
2026-07-16 KAL689 ICN → ICN Jul 16, 10:29 UTCJul 16, 21:55 UTC11h 25m
2026-07-16 KAL1410 PUS → ICN Jul 16, 07:40 UTCJul 16, 08:25 UTC45m
2026-07-16 KAL2086 - Jul 16, 06:00 UTCJul 16, 06:20 UTC20m
2026-07-16 KAL2086 - Jul 16, 04:25 UTCJul 16, 04:45 UTC20m
2026-07-16 KAL2085 - Jul 16, 01:55 UTCJul 16, 02:15 UTC20m
2026-07-16 KAL2085 - Jul 16, 00:25 UTCJul 16, 00:45 UTC20m
2026-07-15 KAL2132 - Jul 15, 10:35 UTCJul 15, 12:10 UTC1h 35m
2026-07-15 KAL2131 PUS → NRT Jul 15, 07:15 UTCJul 15, 08:50 UTC1h 35m
2026-07-15 KAL2130 - Jul 15, 03:55 UTCJul 15, 05:30 UTC1h 35m
2026-07-15 KAL2129 PUS → NRT Jul 15, 00:50 UTCJul 15, 02:30 UTC1h 40m
2026-07-14 KAL1407 ICN → PUS Jul 14, 09:40 UTCJul 14, 10:35 UTC55m
2026-07-13 KAL689 ICN → ICN Jul 13, 10:30 UTCJul 13, 22:50 UTC12h 20m
2026-07-13 KAL1410 PUS → ICN Jul 13, 07:45 UTCJul 13, 08:30 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 HL8505 page for operator, model, and routing details .

Mode-S 71C505 frequently asked

What is Mode-S code 71C505?
71C505 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8505.
Where is Mode-S 71C505 registered?
Mode-S code 71C505 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 71C505 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C505, octal 34342405, decimal 7,456,005.
What flights does 71C505 operate?
Mode-S 71C505 has broadcast 20 distinct callsigns, including KAL2129, KAL2086, KAL2132, KAL2085, KAL2131.