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
Broadcasting now · callsign TWB720 · 23,000 ft
Flights observed
388
Distinct callsigns
20
Country
KR
Last broadcast
4m ago

Current position

71C326 is currently broadcasting. Map zoomed to live position.

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
TWB652 - 8 2026-07-12
TWB640 - 8 2026-07-12
TWB639 - 8 2026-07-12
TWB671 - 7 2026-06-28
TWB314 - 7 2026-07-03
TWB850 - 6 2026-06-04
TWB849 - 6 2026-06-04
TWB676 - 6 2026-06-20
TWB672 - 6 2026-06-28
TWB651 - 6 2026-07-12
TWB332 - 6 2026-07-13
TWB328 Tway Airlines 6 2026-06-05
TWB305 - 6 2026-07-03
TWB226 Tway Airlines 6 2026-06-05
TWB707 - 5 2026-07-07
TWB702 - 5 2026-07-06
TWB690 Tway Airlines 5 2026-06-06
TWB689 Tway Airlines 5 2026-06-06
TWB664 - 5 2026-07-03
TWB643 - 5 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 TWB720 - Jul 15, 05:20 UTCJul 15, 05:30 UTC10m
2026-07-15 TWB903 - Jul 15, 03:20 UTCJul 15, 03:30 UTC10m
2026-07-15 TWB902 - Jul 15, 01:55 UTCJul 15, 02:10 UTC15m
2026-07-14 TWB901 - Jul 14, 23:55 UTCJul 15, 00:05 UTC10m
2026-07-14 TWB908 - Jul 14, 10:20 UTCJul 14, 10:35 UTC15m
2026-07-14 TWB688 - Jul 14, 06:50 UTCJul 14, 07:15 UTC25m
2026-07-14 TWB687 - Jul 14, 04:25 UTCJul 14, 05:00 UTC35m
2026-07-14 TWB807 - Jul 14, 01:15 UTCJul 14, 01:30 UTC15m
2026-07-13 TWB802 - Jul 13, 23:45 UTCJul 14, 00:00 UTC15m
2026-07-13 TWB803 - Jul 13, 21:45 UTCJul 13, 22:00 UTC15m
2026-07-13 TWB810 - Jul 13, 10:40 UTCJul 13, 11:05 UTC25m
2026-07-13 TWB727 - Jul 13, 08:20 UTCJul 13, 08:55 UTC35m
2026-07-13 TWB722 - Jul 13, 06:20 UTCJul 13, 07:01 UTC40m
2026-07-13 TWB332 - Jul 13, 03:40 UTCJul 13, 04:25 UTC45m
2026-07-13 TWB319 PUS → KIX Jul 13, 00:40 UTCJul 13, 01:45 UTC1h 5m
2026-07-12 TWB640 HKG → PUS Jul 12, 18:01 UTCJul 12, 21:15 UTC3h 15m
2026-07-12 TWB639 PUS → HKG Jul 12, 12:55 UTCJul 12, 15:45 UTC2h 50m
2026-07-12 TWB927 GMP → PUS Jul 12, 10:05 UTCJul 12, 10:45 UTC40m
2026-07-12 TWB652 KHH → GMP Jul 12, 05:50 UTCJul 12, 08:20 UTC2h 30m
2026-07-12 TWB651 - Jul 12, 02:01 UTCJul 12, 04:25 UTC2h 25m
2026-07-11 TWB922 PUS → GMP Jul 11, 21:50 UTCJul 11, 22:30 UTC40m
2026-07-11 TWB232 - Jul 11, 02:10 UTCJul 11, 02:50 UTC40m
2026-07-11 TWB231 - Jul 11, 00:15 UTCJul 11, 00:35 UTC20m
2026-07-10 TWB236 - Jul 10, 11:10 UTCJul 10, 11:40 UTC30m
2026-07-10 TWB235 - Jul 10, 09:20 UTCJul 10, 09:45 UTC25m
2026-07-10 TWB322 KIX → PUS Jul 10, 06:45 UTCJul 10, 08:10 UTC1h 25m
2026-07-10 TWB321 PUS → KIX Jul 10, 04:20 UTCJul 10, 05:30 UTC1h 10m
2026-07-10 TWB232 - Jul 10, 02:10 UTCJul 10, 03:05 UTC55m
2026-07-10 TWB231 - Jul 10, 00:15 UTCJul 10, 00:35 UTC20m
2026-07-09 TWB640 - Jul 9, 20:30 UTCJul 9, 21:15 UTC45m
2026-07-09 TWB640 - Jul 9, 18:00 UTCJul 9, 19:15 UTC1h 15m
2026-07-09 TWB639 PUS → HKG Jul 9, 12:50 UTCJul 9, 15:50 UTC3h 0m
2026-07-09 TWB927 GMP → PUS Jul 9, 10:05 UTCJul 9, 10:50 UTC45m
2026-07-09 TWB926 PUS → GMP Jul 9, 08:05 UTCJul 9, 08:55 UTC50m
2026-07-09 TWB925 GMP → PUS Jul 9, 06:10 UTCJul 9, 07:05 UTC55m
2026-07-09 TWB924 PUS → GMP Jul 9, 04:25 UTCJul 9, 05:05 UTC40m
2026-07-09 TWB923 GMP → PUS Jul 9, 02:25 UTCJul 9, 03:25 UTC1h 0m
2026-07-09 TWB706 - Jul 9, 00:25 UTCJul 9, 01:05 UTC40m
2026-07-08 TWB703 - Jul 8, 22:10 UTCJul 8, 22:50 UTC40m
2026-07-08 TWB734 - Jul 8, 12:00 UTCJul 8, 12:40 UTC40m
2026-07-08 TWB733 - Jul 8, 09:45 UTCJul 8, 10:25 UTC40m
2026-07-08 TWB668 - Jul 8, 07:40 UTCJul 8, 08:20 UTC40m
2026-07-08 TWB668 - Jul 8, 06:10 UTCJul 8, 06:35 UTC25m
2026-07-08 TWB667 GMP → TSA Jul 8, 02:35 UTCJul 8, 04:45 UTC2h 10m
2026-07-08 TWB706 - Jul 8, 00:10 UTCJul 8, 00:50 UTC40m
2026-07-07 TWB703 GMP → CJU Jul 7, 22:15 UTCJul 7, 22:55 UTC40m
2026-07-07 TWB736 - Jul 7, 12:25 UTCJul 7, 13:05 UTC40m
2026-07-07 TWB735 - Jul 7, 10:15 UTCJul 7, 10:50 UTC35m
2026-07-07 TWB728 - Jul 7, 08:35 UTCJul 7, 09:10 UTC35m
2026-07-07 TWB905 - Jul 7, 06:20 UTCJul 7, 06:30 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 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?
Yes. Mode-S 71C326 is currently airborne.
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 TWB652, TWB640, TWB639, TWB671, TWB314.