Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C509

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

Currently assigned to HL8509 · AIRBUS A-321neo

Hex
71C509
Octal
34342411
Decimal
7,456,009
Country
KR
Tail
HL8509
Type
A21N
No current signal · last broadcast 3h ago
Flights observed
280
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 71C509.

Country allocation

The ICAO 24-bit address 71C509 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 - 10 2026-07-02
KAL1407 - 8 2026-07-05
KAL743 - 7 2026-07-03
KAL706 - 7 2026-06-29
KAL2132 - 7 2026-07-07
KAL2129 - 7 2026-07-07
KAL2005 - 7 2026-07-10
KAL1831 Korean Air 7 2026-04-26
KAL1826 Korean Air 7 2026-04-26
KAL1823 Korean Air 7 2026-04-26
KAL1410 - 7 2026-07-02
KAL744 - 6 2026-07-04
KAL656 - 6 2026-07-09
KAL2131 - 6 2026-07-07
KAL2085 - 6 2026-07-02
KAL1834 Korean Air 6 2026-04-25
KAL792 - 5 2026-06-28
KAL712 - 5 2026-07-04
KAL711 - 5 2026-07-04
KAL705 - 5 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL485 - Jul 14, 10:20 UTCJul 14, 13:05 UTC2h 45m
2026-07-14 KAL2148 - Jul 14, 04:30 UTCJul 14, 06:20 UTC1h 50m
2026-07-14 KAL2147 - Jul 14, 02:05 UTCJul 14, 02:20 UTC15m
2026-07-14 KAL2147 - Jul 14, 00:40 UTCJul 14, 01:15 UTC35m
2026-07-13 KAL852 - Jul 13, 11:40 UTCJul 13, 12:00 UTC20m
2026-07-13 KAL2065 - Jul 13, 07:30 UTCJul 13, 08:01 UTC30m
2026-07-13 KAL2066 - Jul 13, 04:15 UTCJul 13, 04:35 UTC20m
2026-07-13 KAL2066 - Jul 13, 03:15 UTCJul 13, 03:25 UTC10m
2026-07-12 KAL851 - Jul 12, 23:45 UTCJul 13, 00:10 UTC25m
2026-07-12 KAL770 - Jul 12, 07:40 UTCJul 12, 10:01 UTC2h 20m
2026-07-12 KAL769 - Jul 12, 03:55 UTCJul 12, 06:10 UTC2h 15m
2026-07-11 KAL852 - Jul 11, 13:15 UTCJul 11, 13:30 UTC15m
2026-07-11 KAL2065 - Jul 11, 09:15 UTCJul 11, 09:25 UTC10m
2026-07-11 KAL2065 - Jul 11, 07:20 UTCJul 11, 07:50 UTC30m
2026-07-11 KAL2066 - Jul 11, 04:10 UTCJul 11, 04:25 UTC15m
2026-07-10 KAL851 - Jul 10, 23:35 UTCJul 10, 23:55 UTC20m
2026-07-10 KAL2006 - Jul 10, 13:00 UTCJul 10, 13:30 UTC30m
2026-07-10 KAL2006 - Jul 10, 10:20 UTCJul 10, 10:40 UTC20m
2026-07-10 KAL2005 - Jul 10, 04:40 UTCJul 10, 07:55 UTC3h 15m
2026-07-09 KAL656 - Jul 9, 20:00 UTCJul 10, 01:10 UTC5h 10m
2026-07-09 KAL655 - Jul 9, 12:30 UTCJul 9, 17:30 UTC5h 0m
2026-07-09 KAL770 - Jul 9, 07:45 UTCJul 9, 10:15 UTC2h 30m
2026-07-09 KAL769 - Jul 9, 03:50 UTCJul 9, 06:15 UTC2h 25m
2026-07-08 KAL738 - Jul 8, 17:35 UTCJul 8, 18:55 UTC1h 20m
2026-07-08 KAL737 ICN → KIX Jul 8, 12:10 UTCJul 8, 13:40 UTC1h 30m
2026-07-08 KAL770 - Jul 8, 07:40 UTCJul 8, 10:15 UTC2h 35m
2026-07-08 KAL769 - Jul 8, 03:55 UTCJul 8, 06:20 UTC2h 25m
2026-07-07 KAL1406 PUS → ICN Jul 7, 23:55 UTCJul 8, 00:45 UTC50m
2026-07-07 KAL2132 - Jul 7, 10:30 UTCJul 7, 12:05 UTC1h 35m
2026-07-07 KAL2131 PUS → NRT Jul 7, 07:15 UTCJul 7, 08:55 UTC1h 40m
2026-07-07 KAL2130 - Jul 7, 03:55 UTCJul 7, 05:35 UTC1h 40m
2026-07-07 KAL2129 - Jul 7, 00:35 UTCJul 7, 02:15 UTC1h 40m
2026-07-06 KAL2132 - Jul 6, 10:35 UTCJul 6, 12:10 UTC1h 35m
2026-07-06 KAL2131 PUS → NRT Jul 6, 07:10 UTCJul 6, 08:45 UTC1h 35m
2026-07-06 KAL2130 - Jul 6, 03:55 UTCJul 6, 05:45 UTC1h 50m
2026-07-06 KAL2129 PUS → NRT Jul 6, 00:30 UTCJul 6, 02:05 UTC1h 35m
2026-07-05 KAL1407 - Jul 5, 09:45 UTCJul 5, 10:25 UTC40m
2026-07-04 KAL656 - Jul 4, 19:55 UTCJul 5, 01:15 UTC5h 20m
2026-07-04 KAL655 ICN → BKK Jul 4, 12:35 UTCJul 4, 17:45 UTC5h 10m
2026-07-04 KAL712 - Jul 4, 08:30 UTCJul 4, 10:25 UTC1h 55m
2026-07-04 KAL711 - Jul 4, 04:10 UTCJul 4, 06:15 UTC2h 5m
2026-07-04 KAL744 - Jul 4, 00:30 UTCJul 4, 02:00 UTC1h 30m
2026-07-03 KAL743 - Jul 3, 10:20 UTCJul 3, 11:45 UTC1h 25m
2026-07-03 KAL656 - Jul 3, 00:50 UTCJul 3, 01:10 UTC20m
2026-07-02 KAL656 - Jul 2, 19:50 UTCJul 2, 21:40 UTC1h 50m
2026-07-02 KAL655 - Jul 2, 12:35 UTCJul 2, 17:45 UTC5h 10m
2026-07-02 KAL1410 PUS → ICN Jul 2, 07:40 UTCJul 2, 08:20 UTC40m
2026-07-02 KAL2086 - Jul 2, 05:50 UTCJul 2, 06:15 UTC25m
2026-07-02 KAL2086 - Jul 2, 04:25 UTCJul 2, 04:50 UTC25m
2026-07-02 KAL2085 PUS → TPE Jul 2, 00:10 UTCJul 2, 02:00 UTC1h 50m

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 HL8509 page for operator, model, and routing details .

Mode-S 71C509 frequently asked

What is Mode-S code 71C509?
71C509 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8509.
Where is Mode-S 71C509 registered?
Mode-S code 71C509 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 71C509 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C509, octal 34342411, decimal 7,456,009.
What flights does 71C509 operate?
Mode-S 71C509 has broadcast 20 distinct callsigns, including KAL2086, KAL1407, KAL743, KAL706, KAL2132.