Apparatus

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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
Broadcasting now · callsign KAL2129 · 35,000 ft
Flights observed
145
Distinct callsigns
20
Country
KR
Last broadcast
5m ago

Current position

71C505 is currently broadcasting. Map zoomed to live position.

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 Korean Air 11 2026-05-30
KAL1407 Korean Air 10 2026-05-29
KAL2131 Korean Air 9 2026-05-28
KAL2086 Korean Air 9 2026-05-25
KAL1410 Korean Air 9 2026-05-29
KAL2132 Korean Air 8 2026-05-28
KAL2085 Korean Air 8 2026-05-25
KAL2130 Korean Air 5 2026-05-29
KAL864 Korean Air 3 2026-05-13
KAL863 Korean Air 3 2026-05-13
KAL769 Korean Air 3 2026-05-09
KAL744 Korean Air 3 2026-04-25
KAL743 Korean Air 3 2026-04-24
KAL712 Korean Air 3 2026-05-26
KAL2198 Korean Air 3 2026-05-19
KAL2194 Korean Air 3 2026-05-10
KAL102 Korean Air 3 2026-05-22
KAL101 Korean Air 3 2026-05-22
KAL770 Korean Air 2 2026-05-09
KAL711 Korean Air 2 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 KAL2129 PUS → NRT May 30, 00:55 UTCMay 30, 01:15 UTC20m
2026-05-29 KAL1407 ICN → PUS May 29, 10:20 UTCMay 29, 10:50 UTC30m
2026-05-29 KAL1410 PUS → ICN May 29, 08:15 UTCMay 29, 08:55 UTC40m
2026-05-29 KAL2130 NRT → PUS May 29, 05:00 UTCMay 29, 06:20 UTC1h 20m
2026-05-29 KAL2129 PUS → NRT May 29, 00:55 UTCMay 29, 02:15 UTC1h 20m
2026-05-28 KAL2132 NRT → PUS May 28, 10:35 UTCMay 28, 11:50 UTC1h 15m
2026-05-28 KAL2131 PUS → NRT May 28, 04:00 UTCMay 28, 08:50 UTC4h 50m
2026-05-28 KAL2129 PUS → NRT May 28, 00:55 UTCMay 28, 02:05 UTC1h 10m
2026-05-27 KAL1407 ICN → PUS May 27, 09:55 UTCMay 27, 10:20 UTC25m
2026-05-26 KAL712 NRT → ICN May 26, 08:30 UTCMay 26, 10:25 UTC1h 55m
2026-05-26 KAL711 ICN → NRT May 26, 04:20 UTCMay 26, 06:20 UTC2h 0m
2026-05-25 KAL485 ICN → PQC May 25, 10:35 UTCMay 25, 23:04 UTC12h 30m
2026-05-25 KAL1410 PUS → ICN May 25, 07:55 UTCMay 25, 08:25 UTC30m
2026-05-25 KAL2086 TPE → PUS May 25, 04:40 UTCMay 25, 05:05 UTC25m
2026-05-25 KAL2085 PUS → TPE May 25, 01:55 UTCMay 25, 02:20 UTC25m
2026-05-24 KAL2132 NRT → PUS May 24, 10:35 UTCMay 24, 11:50 UTC1h 15m
2026-05-24 KAL2131 PUS → NRT May 24, 03:55 UTCMay 24, 08:40 UTC4h 45m
2026-05-24 KAL2129 PUS → NRT May 24, 00:55 UTCMay 24, 02:05 UTC1h 10m
2026-05-23 KAL1407 ICN → PUS May 23, 09:55 UTCMay 23, 10:25 UTC30m
2026-05-22 KAL689 ICN → PNH May 22, 10:25 UTCMay 22, 22:05 UTC11h 40m
2026-05-22 KAL102 NKG → ICN May 22, 06:25 UTCMay 22, 06:50 UTC25m
2026-05-22 KAL101 ICN → NKG May 22, 01:55 UTCMay 22, 02:25 UTC30m
2026-05-21 KAL1410 PUS → ICN May 21, 07:35 UTCMay 21, 08:15 UTC40m
2026-05-21 KAL2086 TPE → PUS May 21, 04:15 UTCMay 21, 04:40 UTC25m
2026-05-21 KAL2085 PUS → TPE May 21, 01:50 UTCMay 21, 02:15 UTC25m
2026-05-20 KAL2132 NRT → PUS May 20, 10:30 UTCMay 21, 00:35 UTC14h 5m
2026-05-20 KAL2131 PUS → NRT May 20, 07:40 UTCMay 20, 09:00 UTC1h 20m
2026-05-20 KAL2130 NRT → PUS May 20, 04:00 UTCMay 20, 05:10 UTC1h 11m
2026-05-20 KAL2129 PUS → NRT May 20, 00:55 UTCMay 20, 02:05 UTC1h 10m
2026-05-19 KAL1407 ICN → PUS May 19, 09:45 UTCMay 19, 10:15 UTC30m
2026-05-19 KAL2198 KIJ → ICN May 19, 04:15 UTCMay 19, 05:50 UTC1h 35m
2026-05-19 KAL2197 ICN → KIJ May 19, 01:10 UTCMay 19, 02:30 UTC1h 20m
2026-05-18 KAL1410 PUS → ICN May 18, 08:01 UTCMay 18, 08:25 UTC25m
2026-05-18 KAL2086 TPE → PUS May 18, 04:11 UTCMay 18, 04:30 UTC20m
2026-05-17 KAL2132 NRT → PUS May 17, 10:35 UTCMay 18, 02:00 UTC15h 25m
2026-05-17 KAL2131 PUS → NRT May 17, 04:00 UTCMay 17, 09:00 UTC5h 0m
2026-05-17 KAL2129 PUS → NRT May 17, 00:55 UTCMay 17, 02:25 UTC1h 30m
2026-05-16 KAL1407 ICN → PUS May 16, 09:51 UTCMay 16, 10:20 UTC30m
2026-05-16 KAL874 - May 16, 07:20 UTCMay 16, 07:41 UTC20m
2026-05-16 KAL873 - May 16, 04:15 UTCMay 16, 04:30 UTC15m
2026-05-16 KAL706 NRT → ICN May 16, 00:30 UTCMay 16, 02:20 UTC1h 50m
2026-05-15 KAL705 ICN → NRT May 15, 09:55 UTCMay 15, 12:05 UTC2h 10m
2026-05-15 KAL742 NGO → ICN May 15, 05:20 UTCMay 15, 06:35 UTC1h 15m
2026-05-15 KAL741 ICN → NGO May 15, 02:15 UTCMay 15, 03:45 UTC1h 30m
2026-05-14 KAL2198 KIJ → ICN May 14, 05:00 UTCMay 14, 06:35 UTC1h 35m
2026-05-14 KAL2197 ICN → KIJ May 14, 01:10 UTCMay 14, 02:35 UTC1h 25m
2026-05-13 KAL864 PEK → ICN May 13, 19:20 UTCMay 13, 19:45 UTC25m
2026-05-13 KAL863 ICN → PEK May 13, 11:30 UTCMay 13, 11:40 UTC10m
2026-05-13 KAL102 NKG → ICN May 13, 06:45 UTCMay 13, 07:00 UTC15m
2026-05-13 KAL101 ICN → NKG May 13, 01:45 UTCMay 13, 02:10 UTC25m

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?
Yes. Mode-S 71C505 is currently airborne.
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, KAL1407, KAL2131, KAL2086, KAL1410.