Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 16h ago
Flights observed
142
Distinct callsigns
20
Country
KR
Last broadcast
16h 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 20 distinct

Callsign Airline Flights Last seen
KAL418 - 23 2026-06-22
KAL620 - 19 2026-07-11
KAL619 - 18 2026-07-11
KAL856 - 17 2026-07-13
KAL855 - 15 2026-07-13
KAL155 - 15 2026-07-12
KAL417 - 6 2026-06-26
KAL156 - 6 2026-07-12
KAL806 Korean Air 2 2026-06-02
KAL805 Korean Air 2 2026-06-02
KAL1432 - 2 2026-07-13
KAL1431 - 2 2026-07-13
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
KAL599F - 1 2026-06-04
KAL500P - 1 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-08 KAL619 - Jul 8, 14:15 UTCJul 8, 17:40 UTC3h 25m
2026-07-08 KAL156 - Jul 8, 06:25 UTCJul 8, 11:55 UTC5h 30m
2026-07-08 KAL722 KIX → ICN Jul 8, 00:20 UTCJul 8, 01:45 UTC1h 25m
2026-07-07 KAL721 - Jul 7, 10:15 UTCJul 7, 11:45 UTC1h 30m
2026-07-06 KAL620 - Jul 6, 19:25 UTCJul 6, 22:55 UTC3h 30m
2026-07-06 KAL619 ICN → MNL Jul 6, 14:05 UTCJul 6, 17:40 UTC3h 35m
2026-07-06 KAL155 ICN → ICN Jul 6, 04:45 UTCJul 6, 10:25 UTC5h 40m
2026-07-05 KAL876 - Jul 5, 12:45 UTCJul 5, 13:05 UTC20m
2026-07-05 KAL875 - Jul 5, 10:00 UTCJul 5, 10:25 UTC25m
2026-07-04 KAL128 - Jul 4, 23:55 UTCJul 5, 05:55 UTC6h 0m
2026-07-04 KAL155 ICN → ICN Jul 4, 04:45 UTCJul 4, 10:35 UTC5h 50m
2026-07-02 KAL620 - Jul 2, 19:25 UTCJul 2, 23:00 UTC3h 35m
2026-07-02 KAL619 ICN → MNL Jul 2, 14:10 UTCJul 2, 17:50 UTC3h 40m
2026-07-01 KAL620 - Jul 1, 19:20 UTCJul 1, 22:50 UTC3h 30m
2026-07-01 KAL619 - Jul 1, 14:00 UTCJul 1, 17:45 UTC3h 45m
2026-07-01 KAL856 - Jul 1, 07:00 UTCJul 1, 07:20 UTC20m
2026-07-01 KAL856 - Jul 1, 05:55 UTCJul 1, 06:05 UTC10m
2026-07-01 KAL855 - Jul 1, 02:10 UTCJul 1, 02:30 UTC20m
2026-06-29 KAL620 - Jun 29, 19:29 UTCJun 29, 23:09 UTC3h 40m
2026-06-29 KAL619 - Jun 29, 13:49 UTCJun 29, 17:14 UTC3h 25m
2026-06-29 KAL155 ICN → ICN Jun 29, 04:50 UTCJun 29, 10:24 UTC5h 35m
2026-06-28 KAL156 ICN → ICN Jun 28, 04:44 UTCJun 28, 10:15 UTC5h 30m
2026-06-27 KAL620 - Jun 27, 19:34 UTCJun 27, 23:04 UTC3h 30m
2026-06-27 KAL619 - Jun 27, 13:55 UTCJun 27, 17:34 UTC3h 40m
2026-06-27 KAL155 ICN → ICN Jun 27, 04:49 UTCJun 27, 10:25 UTC5h 35m
2026-06-26 KAL417 ICN → ICN Jun 26, 09:39 UTCJun 26, 20:24 UTC10h 45m
2026-06-25 KAL620 - Jun 25, 19:24 UTCJun 25, 22:49 UTC3h 25m
2026-06-25 KAL619 - Jun 25, 13:59 UTCJun 25, 17:34 UTC3h 35m
2026-06-25 KAL155 - Jun 25, 05:29 UTCJun 25, 11:10 UTC5h 40m
2026-06-24 KAL620 - Jun 24, 19:29 UTCJun 24, 22:55 UTC3h 25m
2026-06-24 KAL619 - Jun 24, 13:54 UTCJun 24, 17:20 UTC3h 25m
2026-06-24 KAL155 - Jun 24, 04:39 UTCJun 24, 10:25 UTC5h 45m
2026-06-22 KAL418 ICN → ICN Jun 22, 09:45 UTCJun 22, 20:14 UTC10h 30m
2026-06-21 KAL155 - Jun 21, 04:49 UTCJun 21, 10:19 UTC5h 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 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 16h 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 20 distinct callsigns, including KAL418, KAL620, KAL619, KAL856, KAL855.