Apparatus

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sensors Mode-S transponder

71C577

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

Currently assigned to HL8577 · BOEING 787-10 Dreamliner

Hex
71C577
Octal
34342567
Decimal
7,456,119
Country
KR
Tail
HL8577
Type
B78X
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
244
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 71C577.

Country allocation

The ICAO 24-bit address 71C577 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
KAL076 Korean Air 17 2026-07-22
KAL075 Korean Air 17 2026-07-21
KAL071 - 14 2026-07-19
KAL2021 - 10 2026-06-23
KAL072 Korean Air 10 2026-07-19
KAL2022 - 9 2026-06-23
KAL2103 Korean Air 8 2026-04-15
KAL724 - 7 2026-07-04
KAL2104 Korean Air 7 2026-04-15
KAL723 - 6 2026-07-04
KAL054 Korean Air 6 2026-07-21
KAL053 Korean Air 6 2026-07-20
KAL970 - 5 2026-07-16
KAL969 - 5 2026-07-15
KAL705 - 5 2026-07-12
KAL704 - 5 2026-06-26
KAL2102 Korean Air 5 2026-04-15
KAL042 Korean Air 5 2026-07-18
KAL041 - 5 2026-07-18
KAL024 Korean Air 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL677 ICN → HKT Jul 26, 09:05 UTCJul 26, 21:45 UTC12h 40m
2026-07-25 KAL434 DPS → ICN Jul 25, 09:55 UTCJul 26, 00:20 UTC14h 25m
2026-07-24 KAL024 SFO → ICN Jul 24, 20:50 UTCJul 25, 07:50 UTC11h 0m
2026-07-24 KAL023 ICN → SFO Jul 24, 07:35 UTCJul 24, 18:20 UTC10h 45m
2026-07-24 KAL918 ZRH → ICN Jul 24, 04:35 UTCJul 24, 05:05 UTC30m
2026-07-23 KAL918 ZRH → ICN Jul 23, 18:15 UTCJul 24, 03:40 UTC9h 25m
2026-07-23 KAL917 ICN → ZRH Jul 23, 04:20 UTCJul 23, 15:45 UTC11h 25m
2026-07-23 KAL917 ICN → ZRH Jul 23, 03:05 UTCJul 23, 03:30 UTC25m
2026-07-22 KAL076 YVR → ICN Jul 22, 16:50 UTCJul 22, 18:55 UTC2h 5m
2026-07-21 KAL075 ICN → YVR Jul 21, 14:20 UTCJul 21, 23:45 UTC9h 25m
2026-07-21 KAL054 HNL → ICN Jul 21, 06:10 UTCJul 21, 08:20 UTC2h 10m
2026-07-20 KAL054 HNL → ICN Jul 20, 23:25 UTCJul 20, 23:40 UTC15m
2026-07-20 KAL053 ICN → HNL Jul 20, 20:20 UTCJul 20, 20:35 UTC15m
2026-07-20 KAL053 ICN → HNL Jul 20, 12:20 UTCJul 20, 14:25 UTC2h 5m
2026-07-19 KAL072 YVR → ICN Jul 19, 22:20 UTCJul 20, 08:40 UTC10h 20m
2026-07-19 KAL071 ICN → YVR Jul 19, 10:15 UTCJul 19, 19:50 UTC9h 35m
2026-07-18 KAL042 SEA → ICN Jul 18, 20:45 UTCJul 19, 07:15 UTC10h 30m
2026-07-18 KAL041 ICN → SEA Jul 18, 08:05 UTCJul 18, 18:00 UTC9h 55m
2026-07-18 KAL938 VIE → ICN Jul 18, 02:40 UTCJul 18, 03:00 UTC21m
2026-07-17 KAL938 VIE → ICN Jul 17, 17:15 UTCJul 18, 02:00 UTC8h 45m
2026-07-17 KAL937 - Jul 17, 03:34 UTCJul 17, 14:15 UTC10h 40m
2026-07-17 KAL937 - Jul 17, 02:20 UTCJul 17, 02:39 UTC20m
2026-07-16 KAL970 - Jul 16, 03:05 UTCJul 16, 03:25 UTC20m
2026-07-15 KAL970 - Jul 15, 17:25 UTCJul 16, 02:25 UTC9h 0m
2026-07-15 KAL969 - Jul 15, 03:55 UTCJul 15, 15:00 UTC11h 5m
2026-07-15 KAL969 - Jul 15, 02:40 UTCJul 15, 02:55 UTC15m
2026-07-14 KAL434 - Jul 14, 09:20 UTCJul 14, 23:45 UTC14h 24m
2026-07-14 KAL928 - Jul 14, 06:35 UTCJul 14, 07:00 UTC25m
2026-07-13 KAL928 - Jul 13, 20:25 UTCJul 14, 05:50 UTC9h 25m
2026-07-13 KAL927 - Jul 13, 06:05 UTCJul 13, 17:25 UTC11h 20m
2026-07-13 KAL927 - Jul 13, 04:55 UTCJul 13, 05:15 UTC20m
2026-07-13 KAL706 - Jul 13, 00:35 UTCJul 13, 02:25 UTC1h 50m
2026-07-12 KAL705 ICN → NRT Jul 12, 10:05 UTCJul 12, 11:55 UTC1h 50m
2026-07-12 KAL970 - Jul 12, 03:25 UTCJul 12, 03:55 UTC30m
2026-07-11 KAL970 - Jul 11, 17:25 UTCJul 12, 02:45 UTC9h 20m
2026-07-11 KAL969 - Jul 11, 02:20 UTCJul 11, 14:40 UTC12h 20m
2026-07-10 KAL468 - Jul 10, 12:40 UTCJul 10, 23:55 UTC11h 15m
2026-07-09 KAL054 - Jul 9, 23:20 UTCJul 10, 08:40 UTC9h 20m
2026-07-09 KAL053 - Jul 9, 12:30 UTCJul 9, 20:30 UTC8h 0m
2026-07-08 KAL882 - Jul 8, 23:55 UTCJul 9, 06:30 UTC6h 35m
2026-07-08 KAL658 - Jul 8, 15:20 UTCJul 8, 20:10 UTC4h 50m
2026-07-08 KAL657 - Jul 8, 02:05 UTCJul 8, 07:05 UTC5h 0m
2026-07-06 KAL024 - Jul 6, 20:35 UTCJul 7, 07:50 UTC11h 15m
2026-07-06 KAL023 ICN → SFO Jul 6, 07:45 UTCJul 6, 17:45 UTC10h 0m
2026-07-05 KAL882 - Jul 5, 23:55 UTCJul 6, 05:30 UTC5h 35m
2026-07-04 KAL042 SEA → ICN Jul 4, 20:35 UTCJul 5, 07:35 UTC11h 0m
2026-07-04 KAL041 ICN → SEA Jul 4, 08:10 UTCJul 4, 17:35 UTC9h 25m
2026-07-04 KAL724 KIX → ICN Jul 4, 03:55 UTCJul 4, 05:20 UTC1h 25m
2026-07-04 KAL723 ICN → KIX Jul 4, 00:55 UTCJul 4, 02:15 UTC1h 20m
2026-07-03 KAL677 - Jul 3, 09:50 UTCJul 3, 22:20 UTC12h 30m

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 HL8577 page for operator, model, and routing details .

Mode-S 71C577 frequently asked

What is Mode-S code 71C577?
71C577 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8577.
Where is Mode-S 71C577 registered?
Mode-S code 71C577 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 71C577 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C577, octal 34342567, decimal 7,456,119.
What flights does 71C577 operate?
Mode-S 71C577 has broadcast 20 distinct callsigns, including KAL076, KAL075, KAL071, KAL2021, KAL072.