Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C712

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

Currently assigned to HL8712 · AIRBUS A-321neo

Hex
71C712
Octal
34343422
Decimal
7,456,530
Country
KR
Tail
HL8712
Type
A21N
No current signal · last broadcast 29m ago
Flights observed
366
Distinct callsigns
20
Country
KR
Last broadcast
29m ago

Last known position

Most recent position reported by Mode-S 71C712.

Country allocation

The ICAO 24-bit address 71C712 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
KAL2005 - 17 2026-06-17
KAL2174 - 10 2026-07-06
KAL2173 - 10 2026-07-06
KAL2171 - 10 2026-07-02
KAL2006 - 10 2026-06-17
KAL1408 - 10 2026-07-10
KAL2172 - 9 2026-07-02
KAL1403 - 9 2026-07-09
KAL712 Korean Air 8 2026-05-08
KAL485 - 8 2026-07-02
KAL864 - 7 2026-07-12
KAL711 Korean Air 7 2026-05-08
KAL2194 - 7 2026-06-21
KAL2193 - 7 2026-06-21
KAL2147 - 7 2026-07-07
KAL2086 - 7 2026-06-28
KAL1407 - 7 2026-07-07
KAL852 Korean Air 6 2026-05-30
KAL741 Korean Air 6 2026-05-27
KAL737 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL737 - Jul 14, 12:40 UTCJul 14, 14:00 UTC1h 20m
2026-07-14 KAL770 - Jul 14, 07:50 UTCJul 14, 10:15 UTC2h 25m
2026-07-14 KAL769 - Jul 14, 03:55 UTCJul 14, 06:20 UTC2h 25m
2026-07-13 KAL656 - Jul 13, 22:15 UTCJul 14, 01:05 UTC2h 50m
2026-07-13 KAL656 - Jul 13, 19:55 UTCJul 13, 20:10 UTC15m
2026-07-13 KAL655 - Jul 13, 17:25 UTCJul 13, 17:45 UTC20m
2026-07-13 KAL655 - Jul 13, 12:50 UTCJul 13, 15:35 UTC2h 45m
2026-07-13 KAL726 KIX → ICN Jul 13, 09:40 UTCJul 13, 11:00 UTC1h 20m
2026-07-13 KAL725 - Jul 13, 06:25 UTCJul 13, 07:45 UTC1h 20m
2026-07-12 KAL864 - Jul 12, 19:05 UTCJul 12, 19:30 UTC25m
2026-07-12 KAL864 - Jul 12, 18:01 UTCJul 12, 18:10 UTC10m
2026-07-12 KAL863 - Jul 12, 11:20 UTCJul 12, 11:40 UTC20m
2026-07-12 KAL856 - Jul 12, 06:55 UTCJul 12, 07:20 UTC25m
2026-07-12 KAL856 - Jul 12, 05:50 UTCJul 12, 06:05 UTC15m
2026-07-12 KAL855 - Jul 12, 02:05 UTCJul 12, 02:25 UTC20m
2026-07-11 KAL738 KIX → ICN Jul 11, 17:30 UTCJul 11, 18:45 UTC1h 15m
2026-07-11 KAL737 ICN → KIX Jul 11, 12:10 UTCJul 11, 13:35 UTC1h 25m
2026-07-11 KAL2016 - Jul 11, 09:30 UTCJul 11, 10:10 UTC40m
2026-07-11 KAL2016 - Jul 11, 07:05 UTCJul 11, 07:15 UTC10m
2026-07-11 KAL2015 - Jul 11, 05:01 UTCJul 11, 05:20 UTC20m
2026-07-11 KAL2015 - Jul 11, 02:25 UTCJul 11, 03:10 UTC45m
2026-07-10 KAL2198 - Jul 10, 11:35 UTCJul 10, 13:20 UTC1h 45m
2026-07-10 KAL2197 - Jul 10, 08:35 UTCJul 10, 09:55 UTC1h 20m
2026-07-10 KAL1408 PUS → ICN Jul 10, 01:45 UTCJul 10, 02:30 UTC45m
2026-07-09 KAL1403 ICN → PUS Jul 9, 23:35 UTCJul 10, 00:10 UTC35m
2026-07-09 KAL864 - Jul 9, 19:10 UTCJul 9, 19:35 UTC25m
2026-07-09 KAL864 - Jul 9, 17:50 UTCJul 9, 18:10 UTC20m
2026-07-09 KAL863 - Jul 9, 11:35 UTCJul 9, 12:00 UTC25m
2026-07-09 KAL874 - Jul 9, 07:45 UTCJul 9, 08:10 UTC25m
2026-07-09 KAL873 - Jul 9, 04:40 UTCJul 9, 05:00 UTC20m
2026-07-08 KAL1406 PUS → ICN Jul 8, 23:55 UTCJul 9, 00:50 UTC55m
2026-07-08 KAL2132 - Jul 8, 10:35 UTCJul 8, 12:10 UTC1h 35m
2026-07-08 KAL2131 PUS → NRT Jul 8, 07:00 UTCJul 8, 08:40 UTC1h 40m
2026-07-08 KAL2130 - Jul 8, 03:50 UTCJul 8, 05:25 UTC1h 35m
2026-07-08 KAL2129 PUS → NRT Jul 8, 00:45 UTCJul 8, 02:20 UTC1h 35m
2026-07-07 KAL1407 ICN → PUS Jul 7, 09:45 UTCJul 7, 10:25 UTC40m
2026-07-07 KAL2148 - Jul 7, 05:20 UTCJul 7, 06:05 UTC45m
2026-07-07 KAL2148 - Jul 7, 04:20 UTCJul 7, 04:35 UTC15m
2026-07-07 KAL2147 - Jul 7, 00:55 UTCJul 7, 02:40 UTC1h 45m
2026-07-06 KAL2174 UKB → ICN Jul 6, 10:00 UTCJul 6, 11:25 UTC1h 25m
2026-07-06 KAL2173 ICN → UKB Jul 6, 07:05 UTCJul 6, 08:20 UTC1h 15m
2026-07-05 KAL2156 - Jul 5, 11:00 UTCJul 5, 12:15 UTC1h 15m
2026-07-05 KAL2155 - Jul 5, 08:35 UTCJul 5, 09:35 UTC1h 0m
2026-07-05 KAL2148 - Jul 5, 04:40 UTCJul 5, 06:35 UTC1h 55m
2026-07-05 KAL2147 - Jul 5, 02:45 UTCJul 5, 03:05 UTC20m
2026-07-05 KAL2147 - Jul 5, 01:20 UTCJul 5, 02:10 UTC50m
2026-07-04 KAL738 KIX → ICN Jul 4, 17:30 UTCJul 4, 18:55 UTC1h 25m
2026-07-04 KAL737 ICN → KIX Jul 4, 12:10 UTCJul 4, 13:25 UTC1h 15m
2026-07-04 KAL2016 - Jul 4, 07:55 UTCJul 4, 10:10 UTC2h 15m
2026-07-04 KAL2015 - Jul 4, 04:10 UTCJul 4, 04:35 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 HL8712 page for operator, model, and routing details .

Mode-S 71C712 frequently asked

What is Mode-S code 71C712?
71C712 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8712.
Where is Mode-S 71C712 registered?
Mode-S code 71C712 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 71C712 broadcasting right now?
No active broadcast right now. Last signal was 29m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C712, octal 34343422, decimal 7,456,530.
What flights does 71C712 operate?
Mode-S 71C712 has broadcast 20 distinct callsigns, including KAL2005, KAL2174, KAL2173, KAL2171, KAL2006.