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 Jul 26, 11:30 UTC
Flights observed
322
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 11:30 UTC

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 Korean Air 14 2026-07-24
KAL2132 Korean Air 9 2026-07-23
KAL2129 Korean Air 9 2026-07-23
KAL2085 Korean Air 9 2026-07-24
KAL1410 Korean Air 9 2026-07-24
KAL1407 - 9 2026-07-17
KAL2131 Korean Air 8 2026-07-23
KAL743 - 7 2026-07-03
KAL706 - 7 2026-06-29
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
KAL792 - 6 2026-07-17
KAL744 - 6 2026-07-04
KAL656 - 6 2026-07-09
KAL2130 Korean Air 6 2026-07-23
KAL1834 Korean Air 6 2026-04-25
KAL770 - 5 2026-07-16
KAL712 - 5 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL2174 UKB → ICN Jul 26, 10:10 UTCJul 26, 11:30 UTC1h 20m
2026-07-26 KAL2173 ICN → UKB Jul 26, 07:25 UTCJul 26, 08:50 UTC1h 25m
2026-07-26 KAL2172 UKB → ICN Jul 26, 03:05 UTCJul 26, 04:30 UTC1h 25m
2026-07-26 KAL2171 ICN → UKB Jul 26, 00:35 UTCJul 26, 01:50 UTC1h 15m
2026-07-25 KAL690 PNH → ICN Jul 25, 14:10 UTCJul 25, 22:55 UTC8h 45m
2026-07-25 KAL689 ICN → PNH Jul 25, 10:30 UTCJul 25, 10:55 UTC25m
2026-07-24 KAL690 PNH → ICN Jul 24, 22:05 UTCJul 24, 22:30 UTC25m
2026-07-24 KAL689 ICN → PNH Jul 24, 10:55 UTCJul 24, 19:15 UTC8h 20m
2026-07-24 KAL1410 PUS → ICN Jul 24, 07:50 UTCJul 24, 08:40 UTC50m
2026-07-24 KAL2086 TPE → PUS Jul 24, 05:50 UTCJul 24, 06:25 UTC35m
2026-07-24 KAL2086 TPE → PUS Jul 24, 04:20 UTCJul 24, 04:40 UTC20m
2026-07-24 KAL2085 PUS → TPE Jul 24, 01:50 UTCJul 24, 02:05 UTC15m
2026-07-24 KAL2085 PUS → TPE Jul 24, 00:15 UTCJul 24, 00:35 UTC20m
2026-07-23 KAL2132 NRT → PUS Jul 23, 11:00 UTCJul 23, 12:30 UTC1h 30m
2026-07-23 KAL2131 PUS → NRT Jul 23, 07:15 UTCJul 23, 08:50 UTC1h 35m
2026-07-23 KAL2130 NRT → PUS Jul 23, 04:05 UTCJul 23, 05:45 UTC1h 40m
2026-07-23 KAL2129 PUS → NRT Jul 23, 00:55 UTCJul 23, 02:35 UTC1h 40m
2026-07-21 KAL626 - Jul 21, 17:55 UTCJul 21, 21:20 UTC3h 25m
2026-07-21 KAL625 ICN → CGK Jul 21, 12:30 UTCJul 21, 16:05 UTC3h 35m
2026-07-21 KAL2016 MFM → ICN Jul 21, 06:30 UTCJul 21, 09:50 UTC3h 20m
2026-07-21 KAL2015 ICN → MFM Jul 21, 01:50 UTCJul 21, 04:20 UTC2h 30m
2026-07-20 KAL690 PNH → ICN Jul 20, 10:15 UTCJul 20, 22:25 UTC12h 10m
2026-07-20 KAL102 - Jul 20, 06:35 UTCJul 20, 07:00 UTC25m
2026-07-20 KAL101 ICN → NKG Jul 20, 01:55 UTCJul 20, 02:30 UTC35m
2026-07-19 KAL864 - Jul 19, 18:45 UTCJul 19, 19:15 UTC30m
2026-07-19 KAL864 - Jul 19, 17:50 UTCJul 19, 18:00 UTC10m
2026-07-19 KAL863 ICN → PEK Jul 19, 11:35 UTCJul 19, 12:05 UTC30m
2026-07-19 KAL1410 PUS → ICN Jul 19, 07:45 UTCJul 19, 08:20 UTC35m
2026-07-19 KAL2086 TPE → PUS Jul 19, 05:45 UTCJul 19, 06:20 UTC35m
2026-07-19 KAL2086 TPE → PUS Jul 19, 04:15 UTCJul 19, 04:40 UTC25m
2026-07-19 KAL2085 PUS → TPE Jul 19, 00:15 UTCJul 19, 02:10 UTC1h 55m
2026-07-18 KAL2132 - Jul 18, 10:30 UTCJul 18, 12:05 UTC1h 35m
2026-07-18 KAL2131 PUS → NRT Jul 18, 07:15 UTCJul 18, 08:55 UTC1h 40m
2026-07-18 KAL2130 - Jul 18, 04:00 UTCJul 18, 05:40 UTC1h 40m
2026-07-18 KAL2129 PUS → NRT Jul 18, 00:35 UTCJul 18, 02:09 UTC1h 35m
2026-07-17 KAL1407 ICN → PUS Jul 17, 09:45 UTCJul 17, 10:35 UTC50m
2026-07-17 KAL792 - Jul 17, 06:00 UTCJul 17, 06:54 UTC55m
2026-07-17 KAL791 ICN → FUK Jul 17, 02:20 UTCJul 17, 03:05 UTC45m
2026-07-16 KAL738 KIX → ICN Jul 16, 17:25 UTCJul 16, 18:40 UTC1h 15m
2026-07-16 KAL737 ICN → KIX Jul 16, 12:09 UTCJul 16, 13:30 UTC1h 20m
2026-07-16 KAL770 - Jul 16, 07:35 UTCJul 16, 10:00 UTC2h 25m
2026-07-16 KAL769 - Jul 16, 03:50 UTCJul 16, 06:00 UTC2h 10m
2026-07-14 KAL486 - Jul 14, 10:20 UTCJul 14, 23:05 UTC12h 44m
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

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 Jul 26, 11:30 UTC.
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, KAL2132, KAL2129, KAL2085, KAL1410.