Apparatus

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sensors Mode-S transponder

71C241

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

Currently assigned to HL8241 · BOEING 737-800

Hex
71C241
Octal
34341101
Decimal
7,455,297
Country
KR
Tail
HL8241
Type
B738
No current signal · last broadcast Jul 26, 10:35 UTC
Flights observed
161
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 10:35 UTC

Last known position

Most recent position reported by Mode-S 71C241.

Country allocation

The ICAO 24-bit address 71C241 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
KAL155 Korean Air 22 2026-07-26
KAL156 Korean Air 21 2026-07-23
KAL418 - 14 2026-06-29
KAL620 Korean Air 12 2026-07-23
KAL619 Korean Air 12 2026-07-23
KAL1431 - 10 2026-07-16
KAL1432 Korean Air 9 2026-07-16
KAL856 Korean Air 8 2026-06-05
KAL855 Korean Air 8 2026-06-05
KAL134 Korean Air 4 2026-07-21
KAL133 Korean Air 4 2026-07-20
KAL876 - 3 2026-07-15
KAL875 - 3 2026-07-15
KAL417 - 3 2026-06-27
KAL8795 Korean Air 2 2026-05-01
KAL834 Korean Air 2 2026-07-24
KAL833 Korean Air 2 2026-07-24
KAL2186 - 2 2026-06-24
KAL2185 - 2 2026-06-24
KAL194F - 2 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL155 ICN → HFE Jul 26, 04:40 UTCJul 26, 10:35 UTC5h 56m
2026-07-25 KAL2192 NGS → ICN Jul 25, 04:25 UTCJul 25, 05:30 UTC1h 5m
2026-07-25 KAL2191 ICN → NGS Jul 25, 02:00 UTCJul 25, 02:55 UTC55m
2026-07-24 KAL834 SHE → ICN Jul 24, 10:00 UTCJul 24, 10:25 UTC25m
2026-07-24 KAL833 ICN → SHE Jul 24, 06:05 UTCJul 24, 06:40 UTC35m
2026-07-23 KAL620 HKG → ICN Jul 23, 19:35 UTCJul 23, 23:10 UTC3h 35m
2026-07-23 KAL619 ICN → HKG Jul 23, 14:00 UTCJul 23, 17:30 UTC3h 30m
2026-07-23 KAL156 HFE → ICN Jul 23, 04:50 UTCJul 23, 10:40 UTC5h 50m
2026-07-22 KAL708 - Jul 22, 11:10 UTCJul 22, 12:15 UTC1h 5m
2026-07-21 KAL134 CGO → ICN Jul 21, 04:20 UTCJul 21, 04:45 UTC25m
2026-07-20 KAL133 ICN → CGO Jul 20, 23:20 UTCJul 20, 23:55 UTC34m
2026-07-20 KAL156 HFE → ICN Jul 20, 04:50 UTCJul 20, 10:35 UTC5h 45m
2026-07-19 KAL1412 PUS → ICN Jul 19, 09:30 UTCJul 19, 10:10 UTC40m
2026-07-19 KAL1411 ICN → PUS Jul 19, 06:45 UTCJul 19, 07:40 UTC55m
2026-07-18 KAL134 - Jul 18, 04:45 UTCJul 18, 05:05 UTC20m
2026-07-17 KAL133 - Jul 17, 23:25 UTCJul 17, 23:50 UTC25m
2026-07-17 KAL834 - Jul 17, 09:40 UTCJul 17, 10:15 UTC35m
2026-07-17 KAL833 - Jul 17, 06:15 UTCJul 17, 06:35 UTC20m
2026-07-16 KAL1432 TAE → ICN Jul 16, 23:10 UTCJul 16, 23:29 UTC20m
2026-07-16 KAL1431 - Jul 16, 10:45 UTCJul 16, 11:15 UTC30m
2026-07-15 KAL876 - Jul 15, 13:10 UTCJul 15, 13:30 UTC20m
2026-07-15 KAL875 - Jul 15, 10:00 UTCJul 15, 10:25 UTC25m
2026-07-13 KAL620 - Jul 13, 19:25 UTCJul 13, 22:55 UTC3h 30m
2026-07-13 KAL619 ICN → MNL Jul 13, 13:50 UTCJul 13, 17:25 UTC3h 35m
2026-07-13 KAL156 - Jul 13, 04:40 UTCJul 13, 11:00 UTC6h 20m
2026-07-12 KAL128 - Jul 12, 03:30 UTCJul 12, 12:25 UTC8h 55m
2026-07-11 KAL155 - Jul 11, 04:45 UTCJul 11, 10:20 UTC5h 35m
2026-07-09 KAL2198 - Jul 9, 04:25 UTCJul 9, 06:10 UTC1h 45m
2026-07-09 KAL2197 - Jul 9, 01:10 UTCJul 9, 02:30 UTC1h 20m
2026-07-08 KAL876 - Jul 8, 12:45 UTCJul 8, 13:05 UTC20m
2026-07-08 KAL875 - Jul 8, 10:00 UTCJul 8, 10:20 UTC20m
2026-07-07 KAL1432 TAE → ICN Jul 7, 23:00 UTCJul 7, 23:35 UTC35m
2026-07-07 KAL1431 - Jul 7, 10:30 UTCJul 7, 11:05 UTC35m
2026-07-06 KAL876 - Jul 6, 12:45 UTCJul 6, 13:00 UTC15m
2026-07-06 KAL875 - Jul 6, 09:55 UTCJul 6, 10:15 UTC20m
2026-07-05 KAL156 ICN → ICN Jul 5, 04:55 UTCJul 5, 10:40 UTC5h 45m
2026-07-04 KAL620 - Jul 4, 19:15 UTCJul 4, 22:45 UTC3h 30m
2026-07-04 KAL619 ICN → MNL Jul 4, 14:00 UTCJul 4, 17:30 UTC3h 30m
2026-07-04 KAL1412 PUS → ICN Jul 4, 09:30 UTCJul 4, 10:15 UTC45m
2026-07-04 KAL1411 ICN → PUS Jul 4, 06:40 UTCJul 4, 07:25 UTC45m
2026-07-03 KAL620 - Jul 3, 19:30 UTCJul 3, 23:10 UTC3h 40m
2026-07-03 KAL619 - Jul 3, 13:50 UTCJul 3, 17:15 UTC3h 25m
2026-07-03 KAL134 - Jul 3, 04:20 UTCJul 3, 04:40 UTC20m
2026-07-02 KAL133 - Jul 2, 23:25 UTCJul 2, 23:45 UTC20m
2026-07-02 KAL155 - Jul 2, 05:10 UTCJul 2, 10:45 UTC5h 35m
2026-07-01 KAL155 ICN → ICN Jul 1, 05:05 UTCJul 1, 10:55 UTC5h 50m
2026-06-30 KAAL418 - Jun 30, 09:35 UTCJun 30, 20:15 UTC10h 40m
2026-06-29 KAL418 - Jun 29, 09:44 UTCJun 29, 20:00 UTC10h 15m
2026-06-28 KAL418 - Jun 28, 09:45 UTCJun 28, 20:19 UTC10h 35m
2026-06-27 KAL417 ICN → ICN Jun 27, 09:40 UTCJun 27, 20:19 UTC10h 40m

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 HL8241 page for operator, model, and routing details .

Mode-S 71C241 frequently asked

What is Mode-S code 71C241?
71C241 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8241.
Where is Mode-S 71C241 registered?
Mode-S code 71C241 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 71C241 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 10:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C241, octal 34341101, decimal 7,455,297.
What flights does 71C241 operate?
Mode-S 71C241 has broadcast 20 distinct callsigns, including KAL155, KAL156, KAL418, KAL620, KAL619.