Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 3h ago
Flights observed
190
Distinct callsigns
20
Country
KR
Last broadcast
3h ago

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
KAL092 - 13 2026-07-13
KAL037 - 13 2026-07-11
KAL091 - 12 2026-07-13
KAL038 - 11 2026-07-11
KAL925 - 9 2026-06-27
KAL475 - 9 2026-07-07
KAL658 - 8 2026-07-10
KAL926 - 7 2026-06-28
KAL787 Korean Air 7 2026-05-26
KAL657 - 7 2026-07-10
KAL651 - 7 2026-07-03
KAL476 - 7 2026-07-09
KAL788 Korean Air 6 2026-05-27
KAL652 - 6 2026-07-03
KAL623 - 6 2026-06-26
KAL437 Korean Air 6 2026-05-19
KAL624 - 5 2026-06-26
KAL438 Korean Air 5 2026-05-19
KAL946 - 4 2026-06-20
KAL945 - 4 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-03 KAL704 - Jul 3, 05:10 UTCJul 3, 07:10 UTC2h 0m
2026-07-03 KAL703 - Jul 3, 01:35 UTCJul 3, 03:25 UTC1h 50m
2026-07-02 KAL658 - Jul 2, 19:35 UTCJul 2, 19:55 UTC20m
2026-07-02 KAL658 - Jul 2, 15:05 UTCJul 2, 16:45 UTC1h 40m
2026-07-02 KAL657 - Jul 2, 01:10 UTCJul 2, 06:00 UTC4h 50m
2026-07-01 KAL658 - Jul 1, 17:05 UTCJul 1, 20:00 UTC2h 55m
2026-07-01 KAL657 - Jul 1, 06:10 UTCJul 1, 06:25 UTC15m
2026-07-01 KAL657 - Jul 1, 01:30 UTCJul 1, 04:15 UTC2h 45m
2026-06-30 KAL652 - Jun 30, 17:10 UTCJun 30, 21:55 UTC4h 45m
2026-06-30 KAL651 - Jun 30, 10:50 UTCJun 30, 14:05 UTC3h 15m
2026-06-30 KAL651 - Jun 30, 09:20 UTCJun 30, 10:00 UTC40m
2026-06-30 KAL881 ICN → ICN Jun 30, 00:35 UTCJun 30, 05:55 UTC5h 20m
2026-06-29 KAL475 ICN → ICN Jun 29, 10:34 UTCJun 29, 22:10 UTC11h 35m
2026-06-28 KAL475 ICN → ICN Jun 28, 10:44 UTCJun 28, 22:20 UTC11h 35m
2026-06-28 KAL926 - Jun 28, 06:40 UTCJun 28, 07:05 UTC25m
2026-06-27 KAL926 - Jun 27, 19:49 UTCJun 28, 05:55 UTC10h 5m
2026-06-27 KAL925 - Jun 27, 04:29 UTCJun 27, 16:35 UTC12h 5m
2026-06-27 KAL925 - Jun 27, 03:20 UTCJun 27, 03:34 UTC15m
2026-06-26 KAL624 - Jun 26, 15:49 UTCJun 26, 18:54 UTC3h 5m
2026-06-26 KAL623 - Jun 26, 10:25 UTCJun 26, 13:55 UTC3h 30m
2026-06-26 KAL622 - Jun 26, 04:45 UTCJun 26, 08:15 UTC3h 30m
2026-06-25 KAL621 - Jun 25, 23:30 UTCJun 26, 03:00 UTC3h 30m
2026-06-24 KAL038 ORD → ICN Jun 24, 17:55 UTCJun 25, 07:25 UTC13h 30m
2026-06-24 KAL037 ICN → ORD Jun 24, 02:05 UTCJun 24, 14:15 UTC12h 10m
2026-06-22 KAL092 BOS → ICN Jun 22, 17:20 UTCJun 23, 07:45 UTC14h 25m
2026-06-22 KAL091 ICN → BOS Jun 22, 01:10 UTCJun 22, 14:34 UTC13h 25m
2026-06-21 KAL2022 TPE → ICN Jun 21, 05:44 UTCJun 21, 07:45 UTC2h 0m
2026-06-21 KAL2021 - Jun 21, 01:59 UTCJun 21, 03:59 UTC2h 0m
2026-06-20 KAL624 MNL → ICN Jun 20, 16:14 UTCJun 20, 19:34 UTC3h 20m
2026-06-20 KAL623 ICN → MNL Jun 20, 10:20 UTCJun 20, 13:29 UTC3h 10m
2026-06-20 KAL946 - Jun 20, 04:34 UTCJun 20, 04:54 UTC20m

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 3h ago.
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 KAL092, KAL037, KAL091, KAL038, KAL925.