Apparatus

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sensors Mode-S transponder

71C217

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

Currently assigned to HL8217 · BOEING 777-300ER

Hex
71C217
Octal
34341027
Decimal
7,455,255
Country
KR
Tail
HL8217
Type
B77W
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
221
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S 71C217.

Country allocation

The ICAO 24-bit address 71C217 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
KAL037 Korean Air 15 2026-07-23
KAL092 - 14 2026-07-20
KAL091 Korean Air 13 2026-07-20
KAL038 Korean Air 13 2026-07-23
KAL437 Korean Air 12 2026-07-24
KAL658 - 10 2026-07-19
KAL475 - 10 2026-07-18
KAL438 Korean Air 10 2026-07-24
KAL925 - 9 2026-06-27
KAL657 - 9 2026-07-19
KAL476 Korean Air 8 2026-07-22
KAL926 - 7 2026-06-28
KAL787 Korean Air 7 2026-05-26
KAL651 - 7 2026-07-03
KAL788 Korean Air 6 2026-05-27
KAL652 - 6 2026-07-03
KAL623 - 6 2026-06-26
KAL946 Korean Air 5 2026-07-26
KAL945 Korean Air 5 2026-07-26
KAL624 - 5 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KAL946 FRA → ICN Jul 26, 18:00 UTCJul 26, 21:35 UTC3h 35m
2026-07-26 KAL945 ICN → FRA Jul 26, 02:20 UTCJul 26, 14:35 UTC12h 16m
2026-07-25 KAL844 TAO → ICN Jul 25, 09:20 UTCJul 25, 09:50 UTC30m
2026-07-25 KAL843 ICN → TAO Jul 25, 04:50 UTCJul 25, 05:15 UTC25m
2026-07-24 KAL438 CGK → ICN Jul 24, 20:55 UTCJul 25, 02:05 UTC5h 10m
2026-07-24 KAL438 CGK → ICN Jul 24, 19:20 UTCJul 24, 19:35 UTC15m
2026-07-24 KAL437 ICN → CGK Jul 24, 17:00 UTCJul 24, 17:10 UTC10m
2026-07-24 KAL437 ICN → CGK Jul 24, 11:05 UTCJul 24, 15:40 UTC4h 35m
2026-07-23 KAL038 ORD → ICN Jul 23, 17:45 UTCJul 24, 07:30 UTC13h 45m
2026-07-23 KAL037 ICN → ORD Jul 23, 02:10 UTCJul 23, 14:20 UTC12h 10m
2026-07-22 KAL476 SGN → ICN Jul 22, 11:15 UTCJul 22, 22:35 UTC11h 20m
2026-07-21 KAL438 CGK → ICN Jul 21, 21:25 UTCJul 22, 02:20 UTC4h 55m
2026-07-21 KAL438 CGK → ICN Jul 21, 19:50 UTCJul 21, 20:00 UTC10m
2026-07-21 KAL437 - Jul 21, 17:50 UTCJul 21, 18:05 UTC15m
2026-07-21 KAL437 - Jul 21, 11:45 UTCJul 21, 16:20 UTC4h 35m
2026-07-20 KAL092 - Jul 20, 17:20 UTCJul 21, 07:50 UTC14h 29m
2026-07-20 KAL091 ICN → BOS Jul 20, 00:50 UTCJul 20, 14:00 UTC13h 10m
2026-07-19 KAL658 - Jul 19, 17:05 UTCJul 19, 19:50 UTC2h 45m
2026-07-19 KAL658 - Jul 19, 15:00 UTCJul 19, 15:10 UTC10m
2026-07-19 KAL657 - Jul 19, 05:35 UTCJul 19, 05:50 UTC15m
2026-07-19 KAL657 - Jul 19, 01:05 UTCJul 19, 03:35 UTC2h 30m
2026-07-18 KAL475 ICN → ICN Jul 18, 10:40 UTCJul 18, 22:40 UTC12h 0m
2026-07-17 KAL038 - Jul 17, 17:50 UTCJul 18, 07:05 UTC13h 16m
2026-07-17 KAL037 ICN → ORD Jul 17, 02:10 UTCJul 17, 14:35 UTC12h 25m
2026-07-16 KAL006 LAS → ICN Jul 16, 07:45 UTCJul 16, 20:00 UTC12h 15m
2026-07-15 KAL005 ICN → LAS Jul 15, 12:20 UTCJul 15, 23:30 UTC11h 10m
2026-07-15 KAL874 - Jul 15, 07:50 UTCJul 15, 08:10 UTC20m
2026-07-15 KAL873 - Jul 15, 04:50 UTCJul 15, 05:10 UTC20m
2026-07-14 KAL438 - Jul 14, 21:10 UTCJul 15, 02:20 UTC5h 9m
2026-07-14 KAL437 - Jul 14, 17:05 UTCJul 14, 17:20 UTC15m
2026-07-14 KAL437 - Jul 14, 11:05 UTCJul 14, 15:45 UTC4h 40m
2026-07-13 KAL092 BOS → ICN Jul 13, 17:50 UTCJul 14, 08:10 UTC14h 20m
2026-07-13 KAL091 ICN → BOS Jul 13, 00:45 UTCJul 13, 13:55 UTC13h 10m
2026-07-11 KAL038 - Jul 11, 17:45 UTCJul 12, 06:55 UTC13h 10m
2026-07-11 KAL037 ICN → ORD Jul 11, 02:10 UTCJul 11, 14:55 UTC12h 45m
2026-07-10 KAL658 - Jul 10, 19:30 UTCJul 10, 19:50 UTC20m
2026-07-10 KAL658 - Jul 10, 14:55 UTCJul 10, 16:25 UTC1h 30m
2026-07-10 KAL657 - Jul 10, 01:35 UTCJul 10, 06:35 UTC5h 0m
2026-07-09 KAL476 - Jul 9, 10:30 UTCJul 9, 22:10 UTC11h 40m
2026-07-08 KAL092 BOS → ICN Jul 8, 17:20 UTCJul 9, 07:35 UTC14h 15m
2026-07-08 KAL091 ICN → BOS Jul 8, 00:55 UTCJul 8, 14:15 UTC13h 20m
2026-07-07 KAL475 ICN → ICN Jul 7, 10:20 UTCJul 7, 21:45 UTC11h 25m
2026-07-06 KAL658 - Jul 6, 15:15 UTCJul 6, 20:15 UTC5h 0m
2026-07-06 KAL657 - Jul 6, 01:55 UTCJul 6, 06:50 UTC4h 55m
2026-07-05 KAL658 - Jul 5, 15:00 UTCJul 5, 19:50 UTC4h 50m
2026-07-05 KAL657 - Jul 5, 01:40 UTCJul 5, 06:35 UTC4h 55m
2026-07-04 KAL658 - Jul 4, 14:55 UTCJul 4, 19:50 UTC4h 55m
2026-07-04 KAL657 - Jul 4, 01:10 UTCJul 4, 06:15 UTC5h 5m
2026-07-03 KAL652 - Jul 3, 17:10 UTCJul 3, 22:00 UTC4h 50m
2026-07-03 KAL651 - Jul 3, 09:35 UTCJul 3, 14:40 UTC5h 5m

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 HL8217 page for operator, model, and routing details .

Mode-S 71C217 frequently asked

What is Mode-S code 71C217?
71C217 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8217.
Where is Mode-S 71C217 registered?
Mode-S code 71C217 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 71C217 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C217, octal 34341027, decimal 7,455,255.
What flights does 71C217 operate?
Mode-S 71C217 has broadcast 20 distinct callsigns, including KAL037, KAL092, KAL091, KAL038, KAL437.