Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C506

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

Currently assigned to HL8506 · AIRBUS A-321neo

Hex
71C506
Octal
34342406
Decimal
7,456,006
Country
KR
Tail
HL8506
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
350
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C506.

Country allocation

The ICAO 24-bit address 71C506 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
KAL2086 - 20 2026-07-10
KAL2132 - 17 2026-07-03
KAL2131 - 17 2026-07-03
KAL2129 - 16 2026-07-03
KAL1410 - 15 2026-07-10
KAL2085 - 13 2026-07-10
KAL2016 - 13 2026-06-19
KAL1407 - 13 2026-07-09
KAL625 - 12 2026-06-19
KAL626 - 11 2026-06-19
KAL2015 - 11 2026-06-19
KAL2066 - 10 2026-07-14
KAL2130 - 9 2026-07-03
KAL711 Korean Air 8 2026-05-30
KAL689 - 8 2026-07-12
KAL852 - 7 2026-07-08
KAL712 Korean Air 7 2026-05-30
KAL851 - 6 2026-07-13
KAL2198 - 6 2026-07-02
KAL2065 - 6 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL2066 - Jul 14, 04:10 UTCJul 14, 04:35 UTC25m
2026-07-14 KAL2066 - Jul 14, 03:15 UTCJul 14, 03:25 UTC10m
2026-07-13 KAL851 - Jul 13, 23:50 UTCJul 14, 00:10 UTC20m
2026-07-13 KAL2174 UKB → ICN Jul 13, 10:05 UTCJul 13, 11:25 UTC1h 20m
2026-07-13 KAL2173 ICN → UKB Jul 13, 07:05 UTCJul 13, 08:25 UTC1h 20m
2026-07-13 KAL2172 UKB → ICN Jul 13, 03:10 UTCJul 13, 04:35 UTC1h 25m
2026-07-13 KAL2171 - Jul 13, 00:25 UTCJul 13, 01:45 UTC1h 20m
2026-07-12 KAL689 - Jul 12, 10:15 UTCJul 12, 21:45 UTC11h 30m
2026-07-12 KAL8148 - Jul 12, 05:30 UTCJul 12, 07:15 UTC1h 45m
2026-07-12 KAL8147 - Jul 12, 01:55 UTCJul 12, 03:40 UTC1h 45m
2026-07-11 KAL690 - Jul 11, 22:30 UTCJul 11, 22:50 UTC20m
2026-07-11 KAL689 - Jul 11, 14:20 UTCJul 11, 19:20 UTC5h 0m
2026-07-11 KAL689 - Jul 11, 10:45 UTCJul 11, 11:05 UTC20m
2026-07-11 KAL874 - Jul 11, 07:25 UTCJul 11, 07:55 UTC30m
2026-07-11 KAL873 - Jul 11, 04:30 UTCJul 11, 04:50 UTC20m
2026-07-10 KAL1410 PUS → ICN Jul 10, 07:50 UTCJul 10, 08:35 UTC45m
2026-07-10 KAL2086 - Jul 10, 05:30 UTCJul 10, 05:50 UTC20m
2026-07-10 KAL2086 - Jul 10, 04:05 UTCJul 10, 04:30 UTC25m
2026-07-10 KAL2085 PUS → TPE Jul 10, 00:20 UTCJul 10, 02:20 UTC2h 0m
2026-07-09 KAL1407 ICN → PUS Jul 9, 09:45 UTCJul 9, 10:30 UTC45m
2026-07-09 KAL128 - Jul 9, 05:40 UTCJul 9, 06:25 UTC45m
2026-07-08 KAL127 - Jul 8, 23:45 UTCJul 9, 00:30 UTC45m
2026-07-08 KAL852 - Jul 8, 11:45 UTCJul 8, 12:05 UTC20m
2026-07-08 KAL2065 - Jul 8, 07:15 UTCJul 8, 07:30 UTC15m
2026-07-08 KAL2066 - Jul 8, 04:05 UTCJul 8, 04:40 UTC35m
2026-07-08 KAL2066 - Jul 8, 03:05 UTCJul 8, 03:15 UTC10m
2026-07-07 KAL851 - Jul 7, 23:30 UTCJul 7, 23:55 UTC25m
2026-07-07 KAL852 - Jul 7, 14:15 UTCJul 7, 14:35 UTC20m
2026-07-07 KAL852 - Jul 7, 13:05 UTCJul 7, 13:15 UTC10m
2026-07-07 KAL2065 - Jul 7, 07:10 UTCJul 7, 07:45 UTC35m
2026-07-07 KAL2066 - Jul 7, 04:20 UTCJul 7, 04:35 UTC15m
2026-07-07 KAL2066 - Jul 7, 03:15 UTCJul 7, 03:25 UTC10m
2026-07-06 KAL851 - Jul 6, 23:40 UTCJul 7, 00:05 UTC25m
2026-07-06 KAL162 - Jul 6, 19:10 UTCJul 6, 19:50 UTC40m
2026-07-06 KAL161 - Jul 6, 10:00 UTCJul 6, 10:20 UTC20m
2026-07-06 KAL2194 - Jul 6, 04:05 UTCJul 6, 06:20 UTC2h 15m
2026-07-06 KAL2193 - Jul 6, 00:45 UTCJul 6, 02:10 UTC1h 25m
2026-07-05 KAL852 - Jul 5, 12:25 UTCJul 5, 12:45 UTC20m
2026-07-05 KAL2065 - Jul 5, 07:35 UTCJul 5, 07:55 UTC20m
2026-07-05 KAL2066 - Jul 5, 04:25 UTCJul 5, 04:40 UTC15m
2026-07-05 KAL2066 - Jul 5, 03:20 UTCJul 5, 03:30 UTC10m
2026-07-04 KAL851 - Jul 4, 23:45 UTCJul 5, 00:05 UTC20m
2026-07-04 KAL164 ICN → ICN Jul 4, 10:50 UTCJul 4, 18:25 UTC7h 35m
2026-07-04 KAL1410 PUS → ICN Jul 4, 07:35 UTCJul 4, 08:20 UTC45m
2026-07-04 KAL2086 - Jul 4, 06:05 UTCJul 4, 06:25 UTC20m
2026-07-04 KAL2086 - Jul 4, 04:35 UTCJul 4, 05:00 UTC25m
2026-07-04 KAL2085 PUS → TPE Jul 4, 00:10 UTCJul 4, 02:25 UTC2h 15m
2026-07-03 KAL2132 - Jul 3, 10:40 UTCJul 3, 12:25 UTC1h 45m
2026-07-03 KAL2131 - Jul 3, 07:10 UTCJul 3, 08:55 UTC1h 45m
2026-07-03 KAL2130 - Jul 3, 03:55 UTCJul 3, 05:40 UTC1h 45m

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 HL8506 page for operator, model, and routing details .

Mode-S 71C506 frequently asked

What is Mode-S code 71C506?
71C506 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8506.
Where is Mode-S 71C506 registered?
Mode-S code 71C506 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 71C506 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 71C506, octal 34342406, decimal 7,456,006.
What flights does 71C506 operate?
Mode-S 71C506 has broadcast 20 distinct callsigns, including KAL2086, KAL2132, KAL2131, KAL2129, KAL1410.