Apparatus

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sensors Mode-S transponder

71C240

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

Currently assigned to HL8240 · BOEING 737-800

Hex
71C240
Octal
34341100
Decimal
7,455,296
Country
KR
Tail
HL8240
Type
B738
No current signal · last broadcast Jul 25, 22:50 UTC
Flights observed
176
Distinct callsigns
20
Country
KR
Last broadcast
Jul 25, 22:50 UTC

Last known position

Most recent position reported by Mode-S 71C240.

Country allocation

The ICAO 24-bit address 71C240 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
KAL620 Korean Air 29 2026-07-25
KAL619 Korean Air 26 2026-07-25
KAL418 - 23 2026-06-22
KAL155 Korean Air 19 2026-07-22
KAL856 - 17 2026-07-13
KAL855 - 15 2026-07-13
KAL156 Korean Air 8 2026-07-25
KAL417 - 6 2026-06-26
KAL1432 Korean Air 3 2026-07-21
KAL1431 Korean Air 3 2026-07-21
KAL806 Korean Air 2 2026-06-02
KAL805 Korean Air 2 2026-06-02
KAL134 Korean Air 2 2026-07-20
KAL133 - 2 2026-07-19
KAL876 - 1 2026-07-05
KAL875 - 1 2026-07-05
KAL742 Korean Air 1 2026-06-01
KAL741 Korean Air 1 2026-06-01
KAL722 - 1 2026-07-08
KAL721 - 1 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 KAL620 HKG → ICN Jul 25, 19:15 UTCJul 25, 22:50 UTC3h 35m
2026-07-25 KAL619 ICN → HKG Jul 25, 14:10 UTCJul 25, 17:35 UTC3h 25m
2026-07-25 KAL156 HFE → ICN Jul 25, 04:50 UTCJul 25, 10:30 UTC5h 40m
2026-07-24 KAL620 HKG → ICN Jul 24, 19:30 UTCJul 24, 23:05 UTC3h 35m
2026-07-24 KAL619 ICN → HKG Jul 24, 14:20 UTCJul 24, 17:50 UTC3h 30m
2026-07-24 KAL708 - Jul 24, 10:30 UTCJul 24, 12:25 UTC1h 55m
2026-07-24 KAL707 - Jul 24, 06:30 UTCJul 24, 08:20 UTC1h 50m
2026-07-24 KAL2190 KMQ → ICN Jul 24, 01:20 UTCJul 24, 02:45 UTC1h 25m
2026-07-23 KAL2189 ICN → KMQ Jul 23, 22:50 UTCJul 24, 00:10 UTC1h 20m
2026-07-23 KAL2192 NGS → ICN Jul 23, 04:30 UTCJul 23, 05:30 UTC1h 0m
2026-07-23 KAL2191 ICN → NGS Jul 23, 01:50 UTCJul 23, 02:50 UTC1h 0m
2026-07-22 KAL620 HKG → ICN Jul 22, 19:25 UTCJul 22, 22:55 UTC3h 30m
2026-07-22 KAL619 ICN → HKG Jul 22, 14:10 UTCJul 22, 17:45 UTC3h 35m
2026-07-22 KAL155 ICN → HFE Jul 22, 05:00 UTCJul 22, 11:20 UTC6h 20m
2026-07-21 KAL1432 TAE → ICN Jul 21, 23:10 UTCJul 21, 23:45 UTC35m
2026-07-21 KAL1431 ICN → TAE Jul 21, 10:30 UTCJul 21, 11:00 UTC30m
2026-07-20 KAL620 HKG → ICN Jul 20, 19:25 UTCJul 20, 23:00 UTC3h 35m
2026-07-20 KAL619 ICN → HKG Jul 20, 14:00 UTCJul 20, 17:35 UTC3h 35m
2026-07-20 KAL134 CGO → ICN Jul 20, 04:40 UTCJul 20, 05:05 UTC25m
2026-07-19 KAL133 - Jul 19, 23:30 UTCJul 19, 23:55 UTC25m
2026-07-19 KAL155 ICN → HFE Jul 19, 04:45 UTCJul 19, 10:25 UTC5h 40m
2026-07-18 KAL620 - Jul 18, 19:30 UTCJul 18, 23:00 UTC3h 30m
2026-07-18 KAL619 ICN → MNL Jul 18, 13:50 UTCJul 18, 17:20 UTC3h 30m
2026-07-18 KAL156 ICN → ICN Jul 18, 04:50 UTCJul 18, 10:30 UTC5h 40m
2026-07-17 KAL620 - Jul 17, 23:00 UTCJul 17, 23:35 UTC35m
2026-07-17 KAL620 - Jul 17, 20:04 UTCJul 17, 22:10 UTC2h 5m
2026-07-17 KAL619 ICN → MNL Jul 17, 14:10 UTCJul 17, 17:44 UTC3h 35m
2026-07-16 KAL620 - Jul 16, 22:10 UTCJul 16, 22:49 UTC40m
2026-07-16 KAL620 - Jul 16, 19:20 UTCJul 16, 21:19 UTC2h 0m
2026-07-16 KAL619 ICN → MNL Jul 16, 14:00 UTCJul 16, 17:35 UTC3h 35m
2026-07-16 KAL155 ICN → ICN Jul 16, 04:55 UTCJul 16, 10:35 UTC5h 40m
2026-07-15 KAL620 - Jul 15, 19:25 UTCJul 15, 23:10 UTC3h 45m
2026-07-15 KAL619 - Jul 15, 14:10 UTCJul 15, 17:35 UTC3h 25m
2026-07-15 KAL155 ICN → ICN Jul 15, 05:10 UTCJul 15, 10:30 UTC5h 20m
2026-07-13 KAL1432 - Jul 13, 23:00 UTCJul 13, 23:35 UTC35m
2026-07-13 KAL1431 - Jul 13, 10:20 UTCJul 13, 10:50 UTC30m
2026-07-13 KAL856 - Jul 13, 06:50 UTCJul 13, 07:10 UTC20m
2026-07-13 KAL856 - Jul 13, 05:50 UTCJul 13, 06:05 UTC15m
2026-07-13 KAL855 - Jul 13, 02:01 UTCJul 13, 02:20 UTC20m
2026-07-12 KAL156 - Jul 12, 09:45 UTCJul 12, 10:15 UTC30m
2026-07-12 KAL155 - Jul 12, 04:45 UTCJul 12, 05:25 UTC40m
2026-07-11 KAL620 - Jul 11, 21:05 UTCJul 12, 00:30 UTC3h 25m
2026-07-11 KAL619 - Jul 11, 15:15 UTCJul 11, 19:20 UTC4h 5m
2026-07-11 KAL620 - Jul 11, 00:40 UTCJul 11, 01:00 UTC20m
2026-07-10 KAL620 - Jul 10, 20:35 UTCJul 10, 22:10 UTC1h 35m
2026-07-10 KAL619 ICN → MNL Jul 10, 14:00 UTCJul 10, 18:35 UTC4h 35m
2026-07-09 KAL620 - Jul 9, 19:25 UTCJul 9, 22:55 UTC3h 30m
2026-07-09 KAL619 ICN → MNL Jul 9, 14:00 UTCJul 9, 17:25 UTC3h 25m
2026-07-09 KAL156 ICN → ICN Jul 9, 04:55 UTCJul 9, 10:45 UTC5h 50m
2026-07-08 KAL620 - Jul 8, 19:25 UTCJul 8, 23:00 UTC3h 35m

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 HL8240 page for operator, model, and routing details .

Mode-S 71C240 frequently asked

What is Mode-S code 71C240?
71C240 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8240.
Where is Mode-S 71C240 registered?
Mode-S code 71C240 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 71C240 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 22:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C240, octal 34341100, decimal 7,455,296.
What flights does 71C240 operate?
Mode-S 71C240 has broadcast 20 distinct callsigns, including KAL620, KAL619, KAL418, KAL155, KAL856.