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 13h ago
Flights observed
63
Distinct callsigns
18
Country
KR
Last broadcast
13h ago

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 18 distinct

Callsign Airline Flights Last seen
KAL418 Korean Air 17 2026-05-23
KAL855 Korean Air 12 2026-05-22
KAL856 Korean Air 11 2026-05-22
KAL155 Korean Air 5 2026-05-27
KAL620 Korean Air 2 2026-05-29
KAL619 Korean Air 2 2026-05-29
KAL417 Korean Air 2 2026-05-24
KAL156 Korean Air 2 2026-05-25
KAL806 Korean Air 1 2026-05-28
KAL805 Korean Air 1 2026-05-28
KAL197P Korean Air 1 2026-05-21
KAL196F Korean Air 1 2026-05-21
KAL1432 Korean Air 1 2026-05-28
KAL1431 Korean Air 1 2026-05-28
KAL1409 Korean Air 1 2026-05-08
KAL1404 Korean Air 1 2026-05-08
KAL134 Korean Air 1 2026-05-24
KAL133 Korean Air 1 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 KAL620 HKG → ICN May 29, 19:25 UTCMay 29, 22:55 UTC3h 30m
2026-05-29 KAL619 ICN → HKG May 29, 14:00 UTCMay 29, 17:40 UTC3h 40m
2026-05-28 KAL1432 TAE → ICN May 28, 23:05 UTCMay 28, 23:35 UTC30m
2026-05-28 KAL1431 ICN → TAE May 28, 10:30 UTCMay 28, 11:00 UTC30m
2026-05-28 KAL806 TSN → ICN May 28, 04:50 UTCMay 28, 05:20 UTC30m
2026-05-28 KAL805 ICN → TSN May 28, 00:35 UTCMay 28, 00:55 UTC20m
2026-05-27 KAL155 ICN → HFE May 27, 04:59 UTCMay 27, 10:25 UTC5h 25m
2026-05-25 KAL620 HKG → ICN May 25, 19:25 UTCMay 25, 22:49 UTC3h 25m
2026-05-25 KAL619 ICN → HKG May 25, 14:00 UTCMay 25, 17:35 UTC3h 35m
2026-05-25 KAL156 HFE → ICN May 25, 04:55 UTCMay 25, 10:25 UTC5h 30m
2026-05-24 KAL417 ICN → GUM May 24, 09:35 UTCMay 24, 21:00 UTC11h 25m
2026-05-24 KAL134 CGO → ICN May 24, 04:30 UTCMay 24, 04:50 UTC20m
2026-05-23 KAL133 ICN → CGO May 23, 23:15 UTCMay 23, 23:40 UTC25m
2026-05-23 KAL418 GUM → ICN May 23, 09:45 UTCMay 23, 20:20 UTC10h 36m
2026-05-22 KAL418 GUM → ICN May 22, 09:40 UTCMay 22, 20:30 UTC10h 50m
2026-05-22 KAL856 PEK → ICN May 22, 07:00 UTCMay 22, 07:30 UTC30m
2026-05-22 KAL855 ICN → PEK May 22, 02:10 UTCMay 22, 02:25 UTC15m
2026-05-21 KAL197P GMP → ICN May 21, 23:10 UTCMay 21, 23:35 UTC25m
2026-05-21 KAL196F ICN → GMP May 21, 12:45 UTCMay 21, 13:05 UTC20m
2026-05-20 KAL856 PEK → ICN May 20, 06:45 UTCMay 20, 07:25 UTC40m
2026-05-20 KAL855 ICN → PEK May 20, 02:10 UTCMay 20, 02:30 UTC20m
2026-05-18 KAL155 ICN → HFE May 18, 04:45 UTCMay 18, 10:15 UTC5h 30m
2026-05-17 KAL156 HFE → ICN May 17, 04:50 UTCMay 17, 10:50 UTC6h 0m
2026-05-15 KAL856 PEK → ICN May 15, 06:55 UTCMay 15, 07:15 UTC20m
2026-05-15 KAL855 ICN → PEK May 15, 02:15 UTCMay 15, 02:25 UTC10m
2026-05-11 KAL155 ICN → HFE May 11, 04:50 UTCMay 11, 10:25 UTC5h 35m
2026-05-10 KAL155 ICN → HFE May 10, 04:34 UTCMay 10, 10:00 UTC5h 25m
2026-05-08 KAL1404 PUS → ICN May 8, 23:10 UTCMay 8, 23:45 UTC35m
2026-05-08 KAL1409 ICN → PUS May 8, 11:05 UTCMay 8, 11:30 UTC25m
2026-05-08 KAL855 ICN → PEK May 8, 02:14 UTCMay 8, 02:24 UTC10m
2026-05-06 KAL418 GUM → ICN May 6, 09:45 UTCMay 6, 20:30 UTC10h 44m
2026-05-06 KAL856 PEK → ICN May 6, 05:50 UTCMay 6, 06:00 UTC10m
2026-05-06 KAL855 ICN → PEK May 6, 02:05 UTCMay 6, 02:15 UTC10m
2026-05-04 KAL155 ICN → HFE May 4, 04:44 UTCMay 4, 10:25 UTC5h 40m
2026-05-01 KAL418 GUM → ICN May 1, 09:45 UTCMay 1, 20:45 UTC11h 0m
2026-05-01 KAL855 ICN → PEK May 1, 02:15 UTCMay 1, 02:30 UTC15m
2026-04-30 KAL417 ICN → GUM Apr 30, 09:45 UTCApr 30, 20:15 UTC10h 30m
2026-04-29 KAL418 GUM → ICN Apr 29, 09:50 UTCApr 29, 20:20 UTC10h 30m
2026-04-29 KAL856 PEK → ICN Apr 29, 06:00 UTCApr 29, 06:10 UTC10m
2026-04-29 KAL855 ICN → PEK Apr 29, 02:05 UTCApr 29, 02:15 UTC10m
2026-04-28 KAL418 GUM → ICN Apr 28, 09:50 UTCApr 28, 20:35 UTC10h 45m
2026-04-27 KAL418 GUM → ICN Apr 27, 09:50 UTCApr 27, 20:30 UTC10h 40m
2026-04-27 KAL856 PEK → ICN Apr 27, 07:15 UTCApr 27, 07:25 UTC10m
2026-04-27 KAL856 PEK → ICN Apr 27, 06:15 UTCApr 27, 06:25 UTC10m
2026-04-27 KAL855 ICN → PEK Apr 27, 02:10 UTCApr 27, 02:30 UTC20m
2026-04-26 KAL418 GUM → ICN Apr 26, 09:45 UTCApr 26, 20:15 UTC10h 30m
2026-04-25 KAL418 GUM → ICN Apr 25, 09:45 UTCApr 25, 20:20 UTC10h 35m
2026-04-24 KAL418 GUM → ICN Apr 24, 09:50 UTCApr 24, 20:20 UTC10h 30m
2026-04-23 KAL418 GUM → ICN Apr 23, 09:40 UTCApr 23, 20:45 UTC11h 5m
2026-04-22 KAL418 GUM → ICN Apr 22, 09:45 UTCApr 22, 20:20 UTC10h 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 13h ago.
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 18 distinct callsigns, including KAL418, KAL855, KAL856, KAL155, KAL620.