Apparatus

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sensors Mode-S transponder

71C351

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

Currently assigned to HL8351 · BOEING 737 MAX 8

Hex
71C351
Octal
34341521
Decimal
7,455,569
Country
KR
Tail
HL8351
Type
B38M
No current signal · last broadcast Jul 26, 13:15 UTC
Flights observed
311
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 13:15 UTC

Last known position

Most recent position reported by Mode-S 71C351.

Country allocation

The ICAO 24-bit address 71C351 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
KAL722 - 36 2026-07-16
KAL721 - 36 2026-07-15
KAL834 Korean Air 21 2026-07-20
KAL833 Korean Air 20 2026-07-20
KAL714 - 16 2026-07-17
KAL713 - 15 2026-07-17
KAL841 - 13 2026-07-11
KAL782 Korean Air 13 2026-07-26
KAL781 Korean Air 13 2026-07-26
KAL842 - 11 2026-07-12
KAL741 Korean Air 10 2026-07-26
KAL804 - 9 2026-07-15
KAL803 - 9 2026-07-15
KAL742 Korean Air 9 2026-07-26
KAL806 Korean Air 7 2026-07-23
KAL805 Korean Air 6 2026-07-23
KAL726 Korean Air 6 2026-07-21
KAL796 Korean Air 5 2026-07-18
KAL795 Korean Air 5 2026-07-18
KAL725 Korean Air 5 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL782 FUK → ICN Jul 26, 12:20 UTCJul 26, 13:15 UTC55m
2026-07-26 KAL781 ICN → FUK Jul 26, 10:00 UTCJul 26, 10:40 UTC40m
2026-07-26 KAL742 NGO → ICN Jul 26, 05:20 UTCJul 26, 06:45 UTC1h 26m
2026-07-26 KAL741 ICN → NGO Jul 26, 02:15 UTCJul 26, 03:35 UTC1h 20m
2026-07-25 KAL2198 KIJ → ICN Jul 25, 04:35 UTCJul 25, 06:20 UTC1h 45m
2026-07-25 KAL2197 ICN → KIJ Jul 25, 01:25 UTCJul 25, 02:45 UTC1h 20m
2026-07-24 KAL782 FUK → ICN Jul 24, 12:15 UTCJul 24, 13:15 UTC1h 0m
2026-07-24 KAL781 ICN → FUK Jul 24, 10:00 UTCJul 24, 10:40 UTC40m
2026-07-24 KAL742 NGO → ICN Jul 24, 05:05 UTCJul 24, 06:30 UTC1h 25m
2026-07-24 KAL741 ICN → NGO Jul 24, 02:15 UTCJul 24, 03:35 UTC1h 20m
2026-07-23 KAL806 TSN → ICN Jul 23, 05:55 UTCJul 23, 06:15 UTC20m
2026-07-23 KAL805 ICN → TSN Jul 23, 01:00 UTCJul 23, 01:25 UTC25m
2026-07-22 KAL2198 KIJ → ICN Jul 22, 11:35 UTCJul 22, 13:20 UTC1h 45m
2026-07-22 KAL741 ICN → NGO Jul 22, 02:25 UTCJul 22, 03:45 UTC1h 20m
2026-07-21 KAL726 KIX → ICN Jul 21, 09:35 UTCJul 21, 11:00 UTC1h 25m
2026-07-21 KAL725 ICN → KIX Jul 21, 06:25 UTCJul 21, 08:00 UTC1h 35m
2026-07-21 KAL2190 KMQ → ICN Jul 21, 02:25 UTCJul 21, 03:50 UTC1h 25m
2026-07-20 KAL2189 ICN → KMQ Jul 20, 22:50 UTCJul 21, 00:20 UTC1h 30m
2026-07-20 KAL834 SHE → ICN Jul 20, 09:55 UTCJul 20, 10:20 UTC25m
2026-07-20 KAL833 ICN → SHE Jul 20, 06:05 UTCJul 20, 06:40 UTC35m
2026-07-19 KAL782 FUK → ICN Jul 19, 12:20 UTCJul 19, 13:15 UTC55m
2026-07-19 KAL781 ICN → FUK Jul 19, 09:55 UTCJul 19, 10:45 UTC50m
2026-07-19 KAL2186 - Jul 19, 04:35 UTCJul 19, 05:40 UTC1h 5m
2026-07-19 KAL2185 ICN → OKJ Jul 19, 02:10 UTCJul 19, 03:10 UTC1h 0m
2026-07-18 KAL796 CTS → ICN Jul 18, 11:20 UTCJul 18, 12:10 UTC50m
2026-07-18 KAL795 ICN → CTS Jul 18, 05:45 UTCJul 18, 06:25 UTC40m
2026-07-17 KAL714 - Jul 17, 12:19 UTCJul 17, 14:20 UTC2h 0m
2026-07-17 KAL713 ICN → NRT Jul 17, 08:40 UTCJul 17, 10:40 UTC2h 0m
2026-07-17 KAL2186 - Jul 17, 04:35 UTCJul 17, 05:35 UTC1h 0m
2026-07-17 KAL2185 ICN → OKJ Jul 17, 01:55 UTCJul 17, 02:59 UTC1h 5m
2026-07-16 KAL726 KIX → ICN Jul 16, 09:45 UTCJul 16, 11:05 UTC1h 20m
2026-07-16 KAL725 ICN → KIX Jul 16, 06:40 UTCJul 16, 08:10 UTC1h 30m
2026-07-16 KAL722 - Jul 16, 00:20 UTCJul 16, 01:45 UTC1h 25m
2026-07-15 KAL721 ICN → KIX Jul 15, 10:15 UTCJul 15, 11:45 UTC1h 30m
2026-07-15 KAL804 - Jul 15, 08:05 UTCJul 15, 08:30 UTC25m
2026-07-15 KAL803 - Jul 15, 04:05 UTCJul 15, 04:20 UTC15m
2026-07-14 KAL782 - Jul 14, 12:20 UTCJul 14, 13:35 UTC1h 15m
2026-07-14 KAL781 - Jul 14, 10:10 UTCJul 14, 10:55 UTC45m
2026-07-14 KAL742 - Jul 14, 04:50 UTCJul 14, 06:25 UTC1h 35m
2026-07-14 KAL741 - Jul 14, 01:55 UTCJul 14, 03:20 UTC1h 25m
2026-07-13 KAL2198 - Jul 13, 11:30 UTCJul 13, 13:10 UTC1h 40m
2026-07-13 KAL2197 - Jul 13, 08:20 UTCJul 13, 09:40 UTC1h 20m
2026-07-12 KAL834 - Jul 12, 09:55 UTCJul 12, 10:15 UTC20m
2026-07-12 KAL833 - Jul 12, 05:50 UTCJul 12, 06:05 UTC15m
2026-07-12 KAL842 - Jul 12, 02:50 UTCJul 12, 03:05 UTC15m
2026-07-11 KAL841 - Jul 11, 23:15 UTCJul 11, 23:35 UTC20m
2026-07-11 KAL714 - Jul 11, 12:10 UTCJul 11, 14:05 UTC1h 55m
2026-07-11 KAL713 ICN → NRT Jul 11, 08:35 UTCJul 11, 10:25 UTC1h 50m
2026-07-11 KAL2198 - Jul 11, 04:10 UTCJul 11, 05:45 UTC1h 35m
2026-07-11 KAL2197 - Jul 11, 01:00 UTCJul 11, 02:20 UTC1h 20m

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 HL8351 page for operator, model, and routing details .

Mode-S 71C351 frequently asked

What is Mode-S code 71C351?
71C351 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8351.
Where is Mode-S 71C351 registered?
Mode-S code 71C351 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 71C351 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C351, octal 34341521, decimal 7,455,569.
What flights does 71C351 operate?
Mode-S 71C351 has broadcast 20 distinct callsigns, including KAL722, KAL721, KAL834, KAL833, KAL714.