Apparatus

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sensors Mode-S transponder

71C326

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

Currently assigned to HL8326 · BOEING 737-800

Hex
71C326
Octal
34341446
Decimal
7,455,526
Country
KR
Tail
HL8326
Type
B738
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
448
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S 71C326.

Country allocation

The ICAO 24-bit address 71C326 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
TWB671 Tway Airlines 8 2026-07-21
TWB652 - 8 2026-07-12
TWB640 - 8 2026-07-12
TWB639 - 8 2026-07-12
TWB672 Tway Airlines 7 2026-07-21
TWB332 Tway Airlines 7 2026-07-24
TWB314 - 7 2026-07-03
TWB850 - 6 2026-06-04
TWB849 - 6 2026-06-04
TWB676 - 6 2026-06-20
TWB651 - 6 2026-07-12
TWB331 Tway Airlines 6 2026-07-26
TWB328 Tway Airlines 6 2026-06-05
TWB320 Tway Airlines 6 2026-07-26
TWB313 - 6 2026-07-17
TWB305 - 6 2026-07-03
TWB288 Tway Airlines 6 2026-07-20
TWB287 - 6 2026-07-19
TWB226 Tway Airlines 6 2026-06-05
TWB718 Tway Airlines 5 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB041 PUS → CXR Jul 26, 13:00 UTCJul 26, 21:30 UTC8h 30m
2026-07-26 TWB320 KIX → PUS Jul 26, 10:25 UTCJul 26, 11:25 UTC1h 0m
2026-07-26 TWB331 CJU → KIX Jul 26, 08:00 UTCJul 26, 09:05 UTC1h 5m
2026-07-26 TWB717 GMP → CJU Jul 26, 05:30 UTCJul 26, 06:00 UTC30m
2026-07-26 TWB718 CJU → GMP Jul 26, 03:35 UTCJul 26, 04:15 UTC40m
2026-07-26 TWB809 TAE → CJU Jul 26, 01:35 UTCJul 26, 01:50 UTC15m
2026-07-25 TWB804 CJU → TAE Jul 25, 23:50 UTCJul 26, 00:05 UTC15m
2026-07-25 TWB701 GMP → CJU Jul 25, 21:45 UTCJul 25, 22:15 UTC30m
2026-07-25 TWB736 - Jul 25, 12:30 UTCJul 25, 13:10 UTC40m
2026-07-25 TWB735 GMP → CJU Jul 25, 10:30 UTCJul 25, 11:05 UTC35m
2026-07-25 TWB728 CJU → GMP Jul 25, 08:35 UTCJul 25, 09:25 UTC50m
2026-07-25 TWB905 KWJ → CJU Jul 25, 06:30 UTCJul 25, 06:40 UTC10m
2026-07-25 TWB904 CJU → KWJ Jul 25, 05:15 UTCJul 25, 05:30 UTC15m
2026-07-25 TWB902 CJU → KWJ Jul 25, 01:50 UTCJul 25, 02:00 UTC10m
2026-07-25 TWB901 KWJ → CJU Jul 25, 00:00 UTCJul 25, 00:10 UTC10m
2026-07-24 TWB908 CJU → KWJ Jul 24, 10:30 UTCJul 24, 10:40 UTC10m
2026-07-24 TWB727 GMP → CJU Jul 24, 08:25 UTCJul 24, 09:00 UTC35m
2026-07-24 TWB722 CJU → GMP Jul 24, 06:25 UTCJul 24, 07:10 UTC45m
2026-07-24 TWB332 KIX → CJU Jul 24, 03:30 UTCJul 24, 04:25 UTC55m
2026-07-24 TWB319 PUS → KIX Jul 24, 00:35 UTCJul 24, 01:40 UTC1h 5m
2026-07-23 TWB042 CXR → PUS Jul 23, 22:20 UTCJul 23, 23:00 UTC40m
2026-07-23 TWB041 PUS → CXR Jul 23, 12:45 UTCJul 23, 21:10 UTC8h 25m
2026-07-23 TWB927 GMP → PUS Jul 23, 10:15 UTCJul 23, 11:05 UTC50m
2026-07-23 TWB926 PUS → GMP Jul 23, 08:25 UTCJul 23, 09:15 UTC50m
2026-07-23 TWB925 GMP → PUS Jul 23, 06:40 UTCJul 23, 07:20 UTC40m
2026-07-23 TWB720 CJU → GMP Jul 23, 04:55 UTCJul 23, 05:35 UTC40m
2026-07-23 TWB228 FUK → CJU Jul 23, 01:45 UTCJul 23, 02:10 UTC25m
2026-07-22 TWB213 TAE → FUK Jul 22, 23:30 UTCJul 22, 23:50 UTC20m
2026-07-22 TWB038 CXR → TAE Jul 22, 05:10 UTCJul 22, 21:55 UTC16h 45m
2026-07-22 TWB251 TAE → NRT Jul 22, 01:45 UTCJul 22, 03:25 UTC1h 40m
2026-07-21 TWB013 - Jul 21, 13:10 UTCJul 21, 23:20 UTC10h 10m
2026-07-21 TWB672 KHH → ICN Jul 21, 08:40 UTCJul 21, 11:05 UTC2h 25m
2026-07-21 TWB671 ICN → KHH Jul 21, 05:05 UTCJul 21, 07:35 UTC2h 30m
2026-07-20 TWB056 ICN → ICN Jul 20, 11:20 UTCJul 20, 23:20 UTC12h 0m
2026-07-20 TWB606 - Jul 20, 08:45 UTCJul 20, 09:20 UTC35m
2026-07-20 TWB605 - Jul 20, 04:50 UTCJul 20, 05:10 UTC20m
2026-07-20 TWB288 KMJ → ICN Jul 20, 01:50 UTCJul 20, 02:55 UTC1h 5m
2026-07-19 TWB287 - Jul 19, 23:15 UTCJul 20, 00:25 UTC1h 10m
2026-07-19 TWB208 - Jul 19, 12:05 UTCJul 19, 13:00 UTC55m
2026-07-19 TWB207 ICN → FUK Jul 19, 09:15 UTCJul 19, 10:05 UTC50m
2026-07-19 TWB244 NRT → ICN Jul 19, 05:50 UTCJul 19, 07:55 UTC2h 5m
2026-07-19 TWB243 ICN → NRT Jul 19, 01:50 UTCJul 19, 03:45 UTC1h 55m
2026-07-18 TWB056 ICN → ICN Jul 18, 11:30 UTCJul 18, 23:45 UTC12h 15m
2026-07-18 TWB9618 - Jul 18, 09:10 UTCJul 18, 09:50 UTC40m
2026-07-18 TWB9617 - Jul 18, 05:00 UTCJul 18, 05:40 UTC40m
2026-07-18 TWB288 - Jul 18, 01:34 UTCJul 18, 02:35 UTC1h 0m
2026-07-17 TWB287 - Jul 17, 23:10 UTCJul 18, 00:10 UTC1h 0m
2026-07-17 TWB306 KIX → ICN Jul 17, 10:50 UTCJul 17, 12:10 UTC1h 20m
2026-07-17 TWB313 - Jul 17, 07:55 UTCJul 17, 09:04 UTC1h 10m
2026-07-16 TWB106 - Jul 16, 21:55 UTCJul 17, 00:35 UTC2h 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 HL8326 page for operator, model, and routing details .

Mode-S 71C326 frequently asked

What is Mode-S code 71C326?
71C326 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8326.
Where is Mode-S 71C326 registered?
Mode-S code 71C326 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 71C326 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C326, octal 34341446, decimal 7,455,526.
What flights does 71C326 operate?
Mode-S 71C326 has broadcast 20 distinct callsigns, including TWB671, TWB652, TWB640, TWB639, TWB672.