Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 6h ago
Flights observed
303
Distinct callsigns
20
Country
KR
Last broadcast
6h ago

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 - 21 2026-07-12
KAL2086 - 19 2026-07-13
KAL2132 - 18 2026-07-12
KAL2131 - 17 2026-07-12
KAL1410 - 17 2026-07-13
KAL1407 - 17 2026-07-10
KAL2130 - 16 2026-07-12
KAL2085 - 16 2026-07-13
KAL856 - 6 2026-07-10
KAL744 - 6 2026-07-05
KAL743 - 6 2026-07-04
KAL769 Korean Air 5 2026-06-08
KAL689 - 5 2026-07-13
KAL1406 Korean Air 5 2026-06-08
KAL852 - 4 2026-06-25
KAL770 Korean Air 4 2026-06-08
KAL706 Korean Air 4 2026-06-05
KAL2066 - 4 2026-06-25
KAL2005 - 4 2026-07-05
KAL1401 Korean Air 4 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-13 KAL2086 - Jul 13, 05:50 UTCJul 13, 06:10 UTC20m
2026-07-13 KAL2086 - Jul 13, 04:20 UTCJul 13, 04:50 UTC30m
2026-07-13 KAL2085 PUS → TPE Jul 13, 00:30 UTCJul 13, 02:20 UTC1h 50m
2026-07-12 KAL2132 - Jul 12, 10:45 UTCJul 12, 12:20 UTC1h 35m
2026-07-12 KAL2131 PUS → NRT Jul 12, 07:15 UTCJul 12, 08:50 UTC1h 35m
2026-07-12 KAL2130 - Jul 12, 03:55 UTCJul 12, 05:35 UTC1h 40m
2026-07-12 KAL2129 PUS → NRT Jul 12, 00:35 UTCJul 12, 02:20 UTC1h 45m
2026-07-11 KAL2132 - Jul 11, 10:30 UTCJul 11, 12:15 UTC1h 45m
2026-07-11 KAL2131 PUS → NRT Jul 11, 07:15 UTCJul 11, 08:55 UTC1h 40m
2026-07-11 KAL2130 - Jul 11, 04:01 UTCJul 11, 05:40 UTC1h 40m
2026-07-11 KAL2129 PUS → NRT Jul 11, 00:25 UTCJul 11, 02:05 UTC1h 40m
2026-07-10 KAL1407 ICN → PUS Jul 10, 09:50 UTCJul 10, 10:30 UTC40m
2026-07-10 KAL856 - Jul 10, 07:20 UTCJul 10, 07:45 UTC25m
2026-07-10 KAL856 - Jul 10, 06:10 UTCJul 10, 06:30 UTC20m
2026-07-10 KAL855 - Jul 10, 02:00 UTCJul 10, 02:20 UTC20m
2026-07-09 KAL792 - Jul 9, 06:20 UTCJul 9, 07:15 UTC55m
2026-07-09 KAL791 - Jul 9, 02:35 UTCJul 9, 03:35 UTC1h 0m
2026-07-08 KAL162 - Jul 8, 19:20 UTCJul 8, 19:40 UTC20m
2026-07-08 KAL161 - Jul 8, 10:05 UTCJul 8, 10:30 UTC25m
2026-07-08 KAL856 - Jul 8, 07:10 UTCJul 8, 07:30 UTC20m
2026-07-08 KAL856 - Jul 8, 06:10 UTCJul 8, 06:20 UTC10m
2026-07-08 KAL855 - Jul 8, 02:10 UTCJul 8, 02:30 UTC20m
2026-07-07 KAL2180 - Jul 7, 10:10 UTCJul 7, 11:10 UTC1h 0m
2026-07-07 KAL2179 - Jul 7, 07:45 UTCJul 7, 08:40 UTC55m
2026-07-07 KAL2190 - Jul 7, 01:25 UTCJul 7, 02:55 UTC1h 30m
2026-07-06 KAL2189 - Jul 6, 22:55 UTCJul 7, 00:05 UTC1h 10m
2026-07-06 KAL2172 UKB → ICN Jul 6, 03:30 UTCJul 6, 04:55 UTC1h 25m
2026-07-06 KAL2171 ICN → UKB Jul 6, 00:55 UTCJul 6, 02:15 UTC1h 20m
2026-07-05 KAL2006 HKG → ICN Jul 5, 10:10 UTCJul 5, 13:30 UTC3h 20m
2026-07-05 KAL2005 - Jul 5, 07:55 UTCJul 5, 08:05 UTC10m
2026-07-05 KAL2005 - Jul 5, 05:00 UTCJul 5, 07:20 UTC2h 20m
2026-07-05 KAL744 - Jul 5, 00:25 UTCJul 5, 02:05 UTC1h 40m
2026-07-04 KAL743 - Jul 4, 10:40 UTCJul 4, 11:55 UTC1h 15m
2026-07-03 KAL485 ICN → ICN Jul 3, 10:25 UTCJul 3, 23:15 UTC12h 50m
2026-07-03 KAL1410 PUS → ICN Jul 3, 07:45 UTCJul 3, 08:25 UTC40m
2026-07-03 KAL2086 - Jul 3, 05:45 UTCJul 3, 06:10 UTC25m
2026-07-03 KAL2086 - Jul 3, 04:20 UTCJul 3, 04:45 UTC25m
2026-07-03 KAL2085 PUS → TPE Jul 3, 00:10 UTCJul 3, 02:05 UTC1h 55m
2026-07-02 KAL2132 - Jul 2, 10:40 UTCJul 2, 12:25 UTC1h 45m
2026-07-02 KAL2131 - Jul 2, 07:25 UTCJul 2, 09:10 UTC1h 45m
2026-07-02 KAL2130 - Jul 2, 04:10 UTCJul 2, 06:00 UTC1h 50m
2026-07-02 KAL2129 PUS → NRT Jul 2, 00:30 UTCJul 2, 02:00 UTC1h 30m
2026-07-01 KAL2132 - Jul 1, 10:35 UTCJul 1, 12:15 UTC1h 40m
2026-07-01 KAL2131 PUS → NRT Jul 1, 07:10 UTCJul 1, 08:40 UTC1h 30m
2026-07-01 KAL2130 - Jul 1, 04:05 UTCJul 1, 05:45 UTC1h 40m
2026-07-01 KAL2129 PUS → NRT Jul 1, 00:30 UTCJul 1, 02:15 UTC1h 45m
2026-06-30 KAL1407 ICN → PUS Jun 30, 09:45 UTCJun 30, 10:25 UTC40m
2026-06-30 KAL744 - Jun 30, 00:30 UTCJun 30, 01:55 UTC1h 26m

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 6h ago.
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, KAL2131, KAL1410.