Apparatus

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sensors Mode-S transponder

71C591

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

Currently assigned to HL8591 · AIRBUS A-321neo

Hex
71C591
Octal
34342621
Decimal
7,456,145
Country
KR
Tail
HL8591
Type
A21N
No current signal · last broadcast Jul 26, 13:55 UTC
Flights observed
360
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 13:55 UTC

Last known position

Most recent position reported by Mode-S 71C591.

Country allocation

The ICAO 24-bit address 71C591 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
KAL852 Korean Air 15 2026-07-24
KAL2174 - 12 2026-07-05
KAL2171 - 12 2026-07-05
KAL2066 Korean Air 12 2026-07-24
KAL2016 Korean Air 12 2026-07-26
KAL2173 - 10 2026-07-05
KAL2172 - 10 2026-07-05
KAL851 Korean Air 9 2026-07-23
KAL2065 Korean Air 9 2026-07-24
KAL2015 Korean Air 8 2026-07-26
KAL737 - 7 2026-07-09
KAL2086 Korean Air 7 2026-07-21
KAL792 Korean Air 6 2026-07-19
KAL791 Korean Air 6 2026-07-19
KAL770 - 6 2026-06-28
KAL769 - 6 2026-06-28
KAL738 - 6 2026-07-09
KAL625 - 6 2026-07-13
KAL2198 - 6 2026-07-07
KAL2194 Korean Air 6 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL2016 MFM → ICN Jul 26, 10:45 UTCJul 26, 13:55 UTC3h 10m
2026-07-26 KAL2015 ICN → MFM Jul 26, 05:35 UTCJul 26, 08:00 UTC2h 26m
2026-07-25 KAL656 BKK → ICN Jul 25, 20:15 UTCJul 26, 02:00 UTC5h 45m
2026-07-25 KAL655 ICN → BKK Jul 25, 17:50 UTCJul 25, 18:10 UTC20m
2026-07-25 KAL655 ICN → BKK Jul 25, 13:00 UTCJul 25, 17:00 UTC4h 0m
2026-07-25 KAL726 KIX → ICN Jul 25, 09:45 UTCJul 25, 11:15 UTC1h 30m
2026-07-25 KAL725 ICN → KIX Jul 25, 06:25 UTCJul 25, 07:50 UTC1h 25m
2026-07-25 KAL1408 PUS → ICN Jul 25, 01:55 UTCJul 25, 02:45 UTC50m
2026-07-24 KAL1403 ICN → PUS Jul 24, 23:55 UTCJul 25, 00:35 UTC40m
2026-07-24 KAL852 PEK → ICN Jul 24, 12:10 UTCJul 24, 12:40 UTC30m
2026-07-24 KAL852 PEK → ICN Jul 24, 11:15 UTCJul 24, 11:25 UTC10m
2026-07-24 KAL2065 CJU → PEK Jul 24, 07:50 UTCJul 24, 08:30 UTC40m
2026-07-24 KAL2066 PEK → CJU Jul 24, 04:10 UTCJul 24, 04:55 UTC45m
2026-07-24 KAL2066 PEK → CJU Jul 24, 03:15 UTCJul 24, 03:25 UTC10m
2026-07-23 KAL851 ICN → PEK Jul 23, 23:50 UTCJul 24, 00:15 UTC25m
2026-07-23 KAL418 GUM → ICN Jul 23, 09:50 UTCJul 23, 20:15 UTC10h 25m
2026-07-23 KAL142 XIY → ICN Jul 23, 07:20 UTCJul 23, 07:45 UTC25m
2026-07-23 KAL141 ICN → XIY Jul 23, 00:45 UTCJul 23, 06:30 UTC5h 45m
2026-07-22 KAL457 ICN → DAD Jul 22, 03:10 UTCJul 22, 13:20 UTC10h 10m
2026-07-21 KAL1410 PUS → ICN Jul 21, 07:45 UTCJul 21, 08:40 UTC55m
2026-07-21 KAL2086 TPE → PUS Jul 21, 05:45 UTCJul 21, 06:10 UTC25m
2026-07-21 KAL2086 TPE → PUS Jul 21, 04:20 UTCJul 21, 04:35 UTC15m
2026-07-21 KAL2085 PUS → TPE Jul 21, 02:05 UTCJul 21, 02:15 UTC10m
2026-07-21 KAL2085 PUS → TPE Jul 21, 00:30 UTCJul 21, 00:50 UTC20m
2026-07-20 KAL1407 ICN → PUS Jul 20, 09:50 UTCJul 20, 10:30 UTC40m
2026-07-20 KAL2194 AOJ → ICN Jul 20, 04:40 UTCJul 20, 06:30 UTC1h 50m
2026-07-20 KAL2193 ICN → AOJ Jul 20, 00:35 UTCJul 20, 02:40 UTC2h 5m
2026-07-19 KAL690 PNH → ICN Jul 19, 10:25 UTCJul 19, 22:35 UTC12h 10m
2026-07-19 KAL792 OIT → ICN Jul 19, 06:10 UTCJul 19, 07:10 UTC1h 0m
2026-07-19 KAL791 ICN → FUK Jul 19, 02:25 UTCJul 19, 03:10 UTC45m
2026-07-18 KAL457 ICN → DAD Jul 18, 03:15 UTCJul 18, 13:20 UTC10h 5m
2026-07-17 KAL690 PNH → ICN Jul 17, 22:00 UTCJul 17, 22:35 UTC35m
2026-07-17 KAL689 - Jul 17, 10:25 UTCJul 17, 20:55 UTC10h 30m
2026-07-17 KAL1410 PUS → ICN Jul 17, 07:55 UTCJul 17, 08:35 UTC40m
2026-07-17 KAL2086 - Jul 17, 06:10 UTCJul 17, 06:35 UTC25m
2026-07-17 KAL2086 - Jul 17, 04:39 UTCJul 17, 05:04 UTC25m
2026-07-17 KAL2085 PUS → TPE Jul 17, 00:25 UTCJul 17, 02:15 UTC1h 50m
2026-07-16 KAL2132 NRT → PUS Jul 16, 10:25 UTCJul 16, 12:00 UTC1h 35m
2026-07-16 KAL2131 PUS → NRT Jul 16, 07:10 UTCJul 16, 08:50 UTC1h 40m
2026-07-16 KAL2130 - Jul 16, 04:00 UTCJul 16, 05:35 UTC1h 35m
2026-07-16 KAL2129 PUS → NRT Jul 16, 00:45 UTCJul 16, 02:20 UTC1h 35m
2026-07-15 KAL1407 ICN → PUS Jul 15, 09:50 UTCJul 15, 10:35 UTC45m
2026-07-15 KAL856 - Jul 15, 07:05 UTCJul 15, 07:30 UTC25m
2026-07-15 KAL855 - Jul 15, 02:05 UTCJul 15, 02:30 UTC25m
2026-07-14 KAL689 - Jul 14, 11:00 UTCJul 14, 22:45 UTC11h 44m
2026-07-14 KAL142 - Jul 14, 07:10 UTCJul 14, 07:35 UTC25m
2026-07-14 KAL141 - Jul 14, 00:50 UTCJul 14, 06:20 UTC5h 30m
2026-07-13 KAL626 - Jul 13, 17:30 UTCJul 13, 21:00 UTC3h 30m
2026-07-13 KAL625 ICN → MNL Jul 13, 11:45 UTCJul 13, 15:10 UTC3h 25m
2026-07-13 KAL2016 - Jul 13, 06:25 UTCJul 13, 09:40 UTC3h 15m

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 HL8591 page for operator, model, and routing details .

Mode-S 71C591 frequently asked

What is Mode-S code 71C591?
71C591 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8591.
Where is Mode-S 71C591 registered?
Mode-S code 71C591 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 71C591 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C591, octal 34342621, decimal 7,456,145.
What flights does 71C591 operate?
Mode-S 71C591 has broadcast 20 distinct callsigns, including KAL852, KAL2174, KAL2171, KAL2066, KAL2016.