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
Broadcasting now · callsign KAL2006 · 35,025 ft
Flights observed
128
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

Current position

71C509 is currently broadcasting. Map zoomed to live position.

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
KAL1831 Korean Air 7 2026-04-26
KAL1826 Korean Air 7 2026-04-26
KAL1823 Korean Air 7 2026-04-26
KAL1834 Korean Air 6 2026-04-25
KAL2086 Korean Air 5 2026-05-27
KAL1410 Korean Air 4 2026-05-27
KAL1407 Korean Air 4 2026-05-25
KAL485 Korean Air 3 2026-05-24
KAL2180 Korean Air 3 2026-05-28
KAL2179 Korean Air 3 2026-05-28
KAL2148 Korean Air 3 2026-05-21
KAL2132 Korean Air 3 2026-05-26
KAL2131 Korean Air 3 2026-05-26
KAL2129 Korean Air 3 2026-05-26
KAL2085 Korean Air 3 2026-05-27
KAL892 Korean Air 2 2026-05-27
KAL891 Korean Air 2 2026-05-13
KAL875 Korean Air 2 2026-05-15
KAL873 - 2 2026-05-14
KAL864 Korean Air 2 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 KAL2005 ICN → HKG May 30, 07:35 UTCMay 30, 07:50 UTC15m
2026-05-30 KAL2005 ICN → HKG May 30, 04:40 UTCMay 30, 07:00 UTC2h 20m
2026-05-30 KAL706 NRT → ICN May 30, 02:25 UTCMay 30, 02:55 UTC30m
2026-05-30 KAL706 NRT → ICN May 30, 00:35 UTCMay 30, 01:50 UTC1h 15m
2026-05-29 KAL705 ICN → NRT May 29, 09:55 UTCMay 29, 11:40 UTC1h 45m
2026-05-29 KAL1408 PUS → ICN May 29, 01:55 UTCMay 29, 02:30 UTC35m
2026-05-28 KAL1403 ICN → PUS May 28, 23:40 UTCMay 29, 00:05 UTC25m
2026-05-28 KAL2180 KOJ → ICN May 28, 10:25 UTCMay 28, 11:25 UTC1h 0m
2026-05-28 KAL2179 ICN → KOJ May 28, 07:40 UTCMay 28, 08:25 UTC45m
2026-05-27 KAL892 PVG → ICN May 27, 10:55 UTCMay 28, 02:40 UTC15h 45m
2026-05-27 KAL1410 PUS → ICN May 27, 07:45 UTCMay 27, 08:20 UTC35m
2026-05-27 KAL2086 TPE → PUS May 27, 04:19 UTCMay 27, 04:45 UTC25m
2026-05-27 KAL2085 PUS → TPE May 27, 01:39 UTCMay 27, 02:19 UTC40m
2026-05-26 KAL2132 NRT → PUS May 26, 10:29 UTCMay 26, 11:39 UTC1h 10m
2026-05-26 KAL2131 PUS → NRT May 26, 03:55 UTCMay 26, 08:45 UTC4h 50m
2026-05-26 KAL2129 PUS → NRT May 26, 00:54 UTCMay 26, 02:15 UTC1h 20m
2026-05-25 KAL1407 ICN → PUS May 25, 09:40 UTCMay 25, 10:10 UTC30m
2026-05-24 KAL485 ICN → PQC May 24, 10:25 UTCMay 24, 20:45 UTC10h 20m
2026-05-24 KAL1410 PUS → ICN May 24, 07:45 UTCMay 24, 08:15 UTC30m
2026-05-24 KAL2086 TPE → PUS May 24, 04:15 UTCMay 24, 04:35 UTC20m
2026-05-23 KAL2132 NRT → PUS May 23, 10:35 UTCMay 24, 02:00 UTC15h 26m
2026-05-23 KAL2131 PUS → NRT May 23, 04:00 UTCMay 23, 08:50 UTC4h 50m
2026-05-23 KAL2129 PUS → NRT May 23, 00:50 UTCMay 23, 02:10 UTC1h 20m
2026-05-22 KAL1407 ICN → PUS May 22, 09:45 UTCMay 22, 10:15 UTC30m
2026-05-21 KAL485 ICN → PQC May 21, 10:20 UTCMay 21, 22:30 UTC12h 10m
2026-05-21 KAL2148 OKA → ICN May 21, 00:50 UTCMay 21, 06:45 UTC5h 55m
2026-05-20 KAL2180 KOJ → ICN May 20, 10:25 UTCMay 20, 11:30 UTC1h 5m
2026-05-20 KAL2179 ICN → KOJ May 20, 07:40 UTCMay 20, 08:30 UTC50m
2026-05-19 KAL708 - May 19, 07:45 UTCMay 19, 09:40 UTC1h 55m
2026-05-19 KAL707 - May 19, 04:10 UTCMay 19, 06:15 UTC2h 5m
2026-05-18 KAL1406 PUS → ICN May 18, 23:50 UTCMay 19, 00:35 UTC45m
2026-05-18 KAL1401 ICN → PUS May 18, 22:00 UTCMay 18, 22:30 UTC30m
2026-05-18 KAL864 PEK → ICN May 18, 18:45 UTCMay 18, 19:00 UTC15m
2026-05-18 KAL864 PEK → ICN May 18, 17:35 UTCMay 18, 17:45 UTC10m
2026-05-18 KAL863 ICN → PEK May 18, 11:30 UTCMay 18, 11:45 UTC15m
2026-05-17 KAL485 ICN → PQC May 17, 10:30 UTCMay 17, 22:45 UTC12h 15m
2026-05-17 KAL102 NKG → ICN May 17, 06:45 UTCMay 17, 07:10 UTC25m
2026-05-17 KAL101 ICN → NKG May 17, 01:50 UTCMay 17, 02:10 UTC20m
2026-05-16 KAL486 PQC → ICN May 16, 10:31 UTCMay 16, 23:00 UTC12h 29m
2026-05-16 KAL792 OIT → ICN May 16, 02:35 UTCMay 16, 07:16 UTC4h 41m
2026-05-15 KAL876 - May 15, 12:55 UTCMay 15, 13:10 UTC15m
2026-05-15 KAL875 PUS → PVG May 15, 09:50 UTCMay 15, 10:15 UTC25m
2026-05-14 KAL486 PQC → ICN May 14, 10:31 UTCMay 14, 22:50 UTC12h 20m
2026-05-14 KAL874 - May 14, 07:35 UTCMay 14, 07:55 UTC20m
2026-05-14 KAL873 - May 14, 04:35 UTCMay 14, 04:51 UTC15m
2026-05-13 KAL891 ICN → PVG May 13, 10:40 UTCMay 14, 02:55 UTC16h 15m
2026-05-12 KAL2180 KOJ → ICN May 12, 10:20 UTCMay 12, 11:15 UTC55m
2026-05-12 KAL2179 ICN → KOJ May 12, 07:45 UTCMay 12, 08:40 UTC55m
2026-05-11 KAL891 ICN → PVG May 11, 10:20 UTCMay 11, 11:05 UTC45m
2026-05-11 KAL1410 PUS → ICN May 11, 07:55 UTCMay 11, 08:30 UTC35m

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?
Yes. Mode-S 71C509 is currently airborne.
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 KAL1831, KAL1826, KAL1823, KAL1834, KAL2086.