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
Broadcasting now · callsign KAL781 · 12,650 ft
Flights observed
274
Distinct callsigns
20
Country
KR
Last broadcast
36m ago

Current position

71C351 is currently broadcasting. Map zoomed to live position.

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 - 35 2026-07-02
KAL721 - 35 2026-07-01
KAL834 - 20 2026-07-12
KAL833 - 19 2026-07-12
KAL714 - 15 2026-07-11
KAL713 - 14 2026-07-11
KAL841 - 13 2026-07-11
KAL842 - 11 2026-07-12
KAL781 - 10 2026-07-14
KAL782 - 9 2026-07-09
KAL804 - 8 2026-06-29
KAL803 - 8 2026-06-29
KAL742 - 7 2026-07-14
KAL741 - 7 2026-07-14
KAL806 - 6 2026-06-17
KAL805 - 5 2026-06-17
KAL9718 Korean Air 4 2026-05-30
KAL796 Korean Air 4 2026-07-03
KAL795 - 4 2026-07-03
KAL726 Korean Air 4 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 KAL781 ICN → OSN Jul 14, 10:10 UTCJul 14, 10:15 UTC5m
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
2026-07-10 KAL833 - Jul 10, 06:00 UTCJul 10, 10:35 UTC4h 35m
2026-07-10 KAL842 - Jul 10, 02:50 UTCJul 10, 03:15 UTC25m
2026-07-09 KAL841 - Jul 9, 23:05 UTCJul 9, 23:35 UTC30m
2026-07-09 KAL782 - Jul 9, 12:10 UTCJul 9, 13:15 UTC1h 5m
2026-07-09 KAL781 - Jul 9, 09:50 UTCJul 9, 10:40 UTC50m
2026-07-09 KAL742 - Jul 9, 05:30 UTCJul 9, 06:55 UTC1h 25m
2026-07-09 KAL741 - Jul 9, 01:55 UTCJul 9, 03:15 UTC1h 20m
2026-07-08 KAL714 - Jul 8, 12:10 UTCJul 8, 14:15 UTC2h 5m
2026-07-08 KAL713 ICN → NRT Jul 8, 08:30 UTCJul 8, 10:30 UTC2h 0m
2026-07-08 KAL742 - Jul 8, 05:00 UTCJul 8, 06:25 UTC1h 25m
2026-07-08 KAL741 - Jul 8, 01:55 UTCJul 8, 03:15 UTC1h 20m
2026-07-07 KAL714 - Jul 7, 12:05 UTCJul 7, 14:00 UTC1h 55m
2026-07-07 KAL713 ICN → NRT Jul 7, 08:30 UTCJul 7, 10:25 UTC1h 55m
2026-07-07 KAL742 - Jul 7, 04:55 UTCJul 7, 06:25 UTC1h 30m
2026-07-07 KAL741 - Jul 7, 01:50 UTCJul 7, 03:10 UTC1h 20m
2026-07-06 KAL834 - Jul 6, 10:05 UTCJul 6, 10:30 UTC25m
2026-07-06 KAL833 - Jul 6, 06:10 UTCJul 6, 06:30 UTC20m
2026-07-05 KAL834 - Jul 5, 10:15 UTCJul 5, 10:35 UTC20m
2026-07-05 KAL833 - Jul 5, 06:05 UTCJul 5, 06:25 UTC20m
2026-07-04 KAL834 - Jul 4, 10:05 UTCJul 4, 10:30 UTC25m
2026-07-04 KAL833 - Jul 4, 05:50 UTCJul 4, 06:05 UTC15m
2026-07-04 KAL842 - Jul 4, 02:45 UTCJul 4, 03:05 UTC20m
2026-07-03 KAL841 - Jul 3, 23:05 UTCJul 3, 23:35 UTC30m
2026-07-03 KAL796 CTS → ICN Jul 3, 11:15 UTCJul 3, 12:20 UTC1h 5m
2026-07-03 KAL795 - Jul 3, 06:45 UTCJul 3, 07:35 UTC50m
2026-07-02 KAL834 - Jul 2, 10:00 UTCJul 2, 10:25 UTC25m
2026-07-02 KAL833 - Jul 2, 05:55 UTCJul 2, 06:20 UTC25m
2026-07-02 KAL722 KIX → ICN Jul 2, 00:25 UTCJul 2, 01:55 UTC1h 30m
2026-07-01 KAL721 ICN → KIX Jul 1, 10:15 UTCJul 1, 11:55 UTC1h 40m
2026-07-01 KAL2186 - Jul 1, 04:30 UTCJul 1, 05:40 UTC1h 10m
2026-07-01 KAL2185 ICN → OKJ Jul 1, 01:55 UTCJul 1, 03:00 UTC1h 5m
2026-06-30 KAL834 ICN → ICN Jun 30, 06:10 UTCJun 30, 10:30 UTC4h 20m
2026-06-30 KAL722 KIX → ICN Jun 30, 00:20 UTCJun 30, 01:40 UTC1h 21m
2026-06-29 KAL721 ICN → KIX Jun 29, 10:20 UTCJun 29, 11:50 UTC1h 30m
2026-06-29 KAL804 - Jun 29, 08:04 UTCJun 29, 08:29 UTC25m
2026-06-29 KAL803 - Jun 29, 04:14 UTCJun 29, 04:34 UTC20m
2026-06-29 KAL722 KIX → ICN Jun 29, 00:24 UTCJun 29, 01:44 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?
Yes. Mode-S 71C351 is currently airborne.
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.