Apparatus

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sensors Mode-S transponder

71C706

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

Currently assigned to HL8706 · BOEING 777-300ER

Hex
71C706
Octal
34343406
Decimal
7,456,518
Country
KR
Tail
HL8706
Type
B77W
No current signal · last broadcast 3d ago
Flights observed
125
Distinct callsigns
2
Country
KR
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 71C706.

Country allocation

The ICAO 24-bit address 71C706 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 2 distinct

Callsign Airline Flights Last seen
TWB402 - 64 2026-07-11
TWB401 - 61 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 TWB402 - Jul 11, 05:35 UTCJul 11, 06:05 UTC30m
2026-07-10 TWB402 - Jul 10, 19:00 UTCJul 11, 04:50 UTC9h 51m
2026-07-10 TWB401 - Jul 10, 02:50 UTCJul 10, 15:05 UTC12h 15m
2026-07-10 TWB401 - Jul 10, 01:35 UTCJul 10, 01:50 UTC15m
2026-07-09 TWB402 - Jul 9, 05:35 UTCJul 9, 06:00 UTC25m
2026-07-08 TWB402 - Jul 8, 18:55 UTCJul 9, 04:50 UTC9h 55m
2026-07-08 TWB401 - Jul 8, 03:00 UTCJul 8, 15:20 UTC12h 20m
2026-07-08 TWB401 - Jul 8, 01:45 UTCJul 8, 02:00 UTC15m
2026-07-06 TWB402 - Jul 6, 06:10 UTCJul 6, 06:30 UTC20m
2026-07-05 TWB402 - Jul 5, 18:55 UTCJul 6, 05:15 UTC10h 20m
2026-07-05 TWB401 ICN → CDG Jul 5, 01:45 UTCJul 5, 14:50 UTC13h 5m
2026-07-04 TWB402 - Jul 4, 06:10 UTCJul 4, 06:35 UTC25m
2026-07-03 TWB402 - Jul 3, 19:00 UTCJul 4, 05:15 UTC10h 15m
2026-07-03 TWB401 - Jul 3, 02:50 UTCJul 3, 15:00 UTC12h 10m
2026-07-03 TWB401 - Jul 3, 01:40 UTCJul 3, 01:55 UTC15m
2026-06-29 TWB402 - Jun 29, 07:05 UTCJun 29, 07:30 UTC25m
2026-06-28 TWB402 - Jun 28, 19:55 UTCJun 29, 06:19 UTC10h 25m
2026-06-28 TWB401 ICN → CDG Jun 28, 01:34 UTCJun 28, 14:50 UTC13h 15m
2026-06-27 TWB402 - Jun 27, 06:19 UTCJun 27, 06:40 UTC20m
2026-06-26 TWB402 - Jun 26, 19:09 UTCJun 27, 05:29 UTC10h 20m
2026-06-26 TWB401 - Jun 26, 02:34 UTCJun 26, 14:35 UTC12h 0m
2026-06-26 TWB401 - Jun 26, 01:29 UTCJun 26, 01:39 UTC10m
2026-06-25 TWB402 - Jun 25, 06:35 UTCJun 25, 07:05 UTC30m
2026-06-24 TWB402 - Jun 24, 19:04 UTCJun 25, 05:55 UTC10h 50m
2026-06-24 TWB401 - Jun 24, 02:54 UTCJun 24, 15:09 UTC12h 15m
2026-06-24 TWB401 - Jun 24, 01:39 UTCJun 24, 01:55 UTC15m
2026-06-21 TWB402 - Jun 21, 19:00 UTCJun 21, 22:00 UTC3h 0m
2026-06-21 TWB401 - Jun 21, 02:55 UTCJun 21, 15:19 UTC12h 25m
2026-06-21 TWB401 - Jun 21, 01:39 UTCJun 21, 01:49 UTC10m
2026-06-20 TWB402 - Jun 20, 06:19 UTCJun 20, 06:39 UTC20m
2026-06-19 TWB402 - Jun 19, 19:04 UTCJun 20, 05:34 UTC10h 30m
2026-06-19 TWB401 - Jun 19, 11:09 UTCJun 19, 15:59 UTC4h 50m
2026-06-19 TWB401 - Jun 19, 02:50 UTCJun 19, 03:05 UTC15m
2026-06-17 TWB402 - Jun 17, 19:00 UTCJun 17, 21:40 UTC2h 40m
2026-06-17 TWB401 - Jun 17, 10:00 UTCJun 17, 14:55 UTC4h 55m
2026-06-17 TWB401 - Jun 17, 01:40 UTCJun 17, 02:00 UTC20m
2026-06-15 TWB402 - Jun 15, 06:00 UTCJun 15, 06:24 UTC25m
2026-06-14 TWB402 - Jun 14, 18:50 UTCJun 14, 21:25 UTC2h 35m
2026-06-14 TWB401 - Jun 14, 10:05 UTCJun 14, 15:10 UTC5h 5m
2026-06-14 TWB401 - Jun 14, 01:35 UTCJun 14, 01:50 UTC15m
2026-06-13 TWB402 - Jun 13, 06:00 UTCJun 13, 06:20 UTC20m
2026-06-12 TWB402 - Jun 12, 18:40 UTCJun 13, 05:05 UTC10h 24m
2026-06-12 TWB401 - Jun 12, 03:15 UTCJun 12, 15:25 UTC12h 10m
2026-06-12 TWB401 - Jun 12, 02:00 UTCJun 12, 02:15 UTC15m
2026-06-10 TWB402 CDG → ICN Jun 10, 18:50 UTCJun 10, 23:35 UTC4h 45m
2026-06-10 TWB401 ICN → CDG Jun 10, 02:50 UTCJun 10, 15:00 UTC12h 10m
2026-06-08 TWB402 CDG → ICN Jun 8, 05:45 UTCJun 8, 06:10 UTC25m
2026-06-07 TWB402 CDG → ICN Jun 7, 18:55 UTCJun 8, 05:05 UTC10h 10m
2026-06-07 TWB401 ICN → CDG Jun 7, 02:55 UTCJun 7, 15:10 UTC12h 15m
2026-06-07 TWB401 ICN → CDG Jun 7, 01:35 UTCJun 7, 01:45 UTC10m

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 HL8706 page for operator, model, and routing details .

Mode-S 71C706 frequently asked

What is Mode-S code 71C706?
71C706 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8706.
Where is Mode-S 71C706 registered?
Mode-S code 71C706 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 71C706 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C706, octal 34343406, decimal 7,456,518.
What flights does 71C706 operate?
Mode-S 71C706 has broadcast 2 distinct callsigns, including TWB402, TWB401.