Apparatus

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sensors Mode-S transponder

71C056

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

Currently assigned to HL8056 · BOEING 737-800

Hex
71C056
Octal
34340126
Decimal
7,454,806
Country
KR
Tail
HL8056
Type
B738
No current signal · last broadcast Jul 26, 11:10 UTC
Flights observed
414
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 11:10 UTC

Last known position

Most recent position reported by Mode-S 71C056.

Country allocation

The ICAO 24-bit address 71C056 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
TWB664 - 12 2026-06-30
TWB663 - 12 2026-06-30
TWB669 - 9 2026-07-09
TWB288 - 9 2026-07-11
TWB287 - 9 2026-07-10
TWB670 - 8 2026-07-09
TWB676 - 7 2026-06-24
TWB672 - 7 2026-07-12
TWB671 - 7 2026-07-12
TWB322 Tway Airlines 7 2026-07-24
TWB321 Tway Airlines 7 2026-07-24
TWB312 - 7 2026-07-01
TWB311 Tway Airlines 7 2026-06-30
TWB252 - 7 2026-06-29
TWB251 - 7 2026-06-29
TWB675 - 6 2026-06-24
TWB643 - 6 2026-07-03
TWB640 Tway Airlines 6 2026-07-24
TWB639 Tway Airlines 6 2026-07-24
TWB332 Tway Airlines 6 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB762 - Jul 26, 10:25 UTCJul 26, 11:05 UTC40m
2026-07-26 TWB863 CJJ → CJU Jul 26, 06:40 UTCJul 26, 07:05 UTC25m
2026-07-25 TWB850 - Jul 25, 13:10 UTCJul 25, 13:40 UTC30m
2026-07-25 TWB849 - Jul 25, 11:15 UTCJul 25, 11:45 UTC30m
2026-07-25 TWB844 CJU → CJJ Jul 25, 09:30 UTCJul 25, 10:00 UTC30m
2026-07-25 TWB907 KWJ → CJU Jul 25, 08:00 UTCJul 25, 08:15 UTC15m
2026-07-25 TWB906 CJU → KWJ Jul 25, 06:50 UTCJul 25, 07:05 UTC15m
2026-07-25 TWB332 KIX → CJU Jul 25, 03:20 UTCJul 25, 04:15 UTC55m
2026-07-25 TWB319 PUS → KIX Jul 25, 00:30 UTCJul 25, 01:30 UTC1h 0m
2026-07-24 TWB640 HKG → PUS Jul 24, 20:45 UTCJul 24, 21:20 UTC35m
2026-07-24 TWB640 HKG → PUS Jul 24, 18:10 UTCJul 24, 19:40 UTC1h 30m
2026-07-24 TWB639 PUS → HKG Jul 24, 13:45 UTCJul 24, 16:35 UTC2h 50m
2026-07-24 TWB236 FUK → PUS Jul 24, 11:15 UTCJul 24, 11:55 UTC40m
2026-07-24 TWB235 PUS → FUK Jul 24, 09:15 UTCJul 24, 09:40 UTC25m
2026-07-24 TWB322 KIX → PUS Jul 24, 06:40 UTCJul 24, 07:50 UTC1h 10m
2026-07-24 TWB321 PUS → KIX Jul 24, 04:10 UTCJul 24, 05:25 UTC1h 15m
2026-07-24 TWB232 FUK → PUS Jul 24, 02:30 UTCJul 24, 03:00 UTC30m
2026-07-24 TWB231 PUS → FUK Jul 24, 00:25 UTCJul 24, 01:00 UTC35m
2026-07-23 TWB236 FUK → PUS Jul 23, 11:05 UTCJul 23, 11:45 UTC40m
2026-07-23 TWB235 PUS → FUK Jul 23, 09:05 UTCJul 23, 09:25 UTC20m
2026-07-23 TWB322 KIX → PUS Jul 23, 06:45 UTCJul 23, 07:55 UTC1h 10m
2026-07-23 TWB321 PUS → KIX Jul 23, 04:10 UTCJul 23, 05:15 UTC1h 5m
2026-07-23 TWB232 FUK → PUS Jul 23, 02:10 UTCJul 23, 02:45 UTC35m
2026-07-23 TWB231 PUS → FUK Jul 23, 00:20 UTCJul 23, 00:40 UTC20m
2026-07-22 TWB042 CXR → PUS Jul 22, 22:00 UTCJul 22, 22:25 UTC25m
2026-07-22 TWB041 PUS → CXR Jul 22, 12:35 UTCJul 22, 20:50 UTC8h 15m
2026-07-22 TWB667 GMP → TSA Jul 22, 02:30 UTCJul 22, 04:35 UTC2h 5m
2026-07-22 TWB706 - Jul 22, 00:15 UTCJul 22, 00:55 UTC40m
2026-07-21 TWB703 - Jul 21, 22:10 UTCJul 21, 22:45 UTC35m
2026-07-21 TWB736 - Jul 21, 13:05 UTCJul 21, 13:40 UTC35m
2026-07-21 TWB735 GMP → CJU Jul 21, 10:55 UTCJul 21, 11:35 UTC40m
2026-07-21 TWB728 CJU → GMP Jul 21, 09:10 UTCJul 21, 09:55 UTC45m
2026-07-21 TWB905 KWJ → CJU Jul 21, 07:20 UTCJul 21, 07:30 UTC10m
2026-07-21 TWB904 CJU → KWJ Jul 21, 05:55 UTCJul 21, 06:10 UTC15m
2026-07-21 TWB903 KWJ → CJU Jul 21, 03:20 UTCJul 21, 03:30 UTC10m
2026-07-21 TWB902 CJU → KWJ Jul 21, 02:10 UTCJul 21, 02:35 UTC25m
2026-07-21 TWB843 CJJ → CJU Jul 21, 00:10 UTCJul 21, 00:40 UTC30m
2026-07-20 TWB850 - Jul 20, 13:20 UTCJul 20, 13:50 UTC30m
2026-07-20 TWB849 - Jul 20, 11:15 UTCJul 20, 11:50 UTC35m
2026-07-20 TWB686 YNJ → CJJ Jul 20, 08:35 UTCJul 20, 09:05 UTC30m
2026-07-20 TWB685 - Jul 20, 03:40 UTCJul 20, 04:15 UTC35m
2026-07-20 TWB842 CJU → CJJ Jul 20, 01:40 UTCJul 20, 02:10 UTC30m
2026-07-19 TWB841 CJJ → CJU Jul 19, 23:10 UTCJul 19, 23:45 UTC35m
2026-07-19 TWB850 - Jul 19, 13:10 UTCJul 19, 13:40 UTC30m
2026-07-19 TWB849 - Jul 19, 11:15 UTCJul 19, 11:40 UTC25m
2026-07-19 TWB844 - Jul 19, 09:35 UTCJul 19, 10:05 UTC30m
2026-07-19 TWB688 - Jul 19, 06:35 UTCJul 19, 06:55 UTC20m
2026-07-19 TWB687 - Jul 19, 04:20 UTCJul 19, 05:15 UTC55m
2026-07-19 TWB807 - Jul 19, 01:10 UTCJul 19, 01:25 UTC15m
2026-07-18 TWB802 CJU → TAE Jul 18, 23:55 UTCJul 19, 00:15 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 HL8056 page for operator, model, and routing details .

Mode-S 71C056 frequently asked

What is Mode-S code 71C056?
71C056 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8056.
Where is Mode-S 71C056 registered?
Mode-S code 71C056 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 71C056 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C056, octal 34340126, decimal 7,454,806.
What flights does 71C056 operate?
Mode-S 71C056 has broadcast 20 distinct callsigns, including TWB664, TWB663, TWB669, TWB288, TWB287.