Apparatus

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sensors Mode-S transponder

71C300

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

Currently assigned to HL8300 · BOEING 737-800

Hex
71C300
Octal
34341400
Decimal
7,455,488
Country
KR
Tail
HL8300
Type
B738
Broadcasting now · callsign TWB306 · 17,000 ft
Flights observed
345
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Current position

71C300 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C300 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
TWB126 - 15 2026-07-08
TWB125 - 13 2026-07-08
TWB672 - 10 2026-07-10
TWB669 - 10 2026-07-05
TWB287 - 10 2026-07-09
TWB671 - 9 2026-07-10
TWB670 - 9 2026-07-05
TWB288 - 9 2026-07-10
TWB243 - 7 2026-06-28
TWB013 - 7 2026-07-10
TWB676 Tway Airlines 6 2026-06-09
TWB675 Tway Airlines 6 2026-06-09
TWB244 - 6 2026-06-28
TWB664 - 5 2026-07-13
TWB663 - 5 2026-07-13
TWB652 - 5 2026-06-14
TWB322 - 5 2026-06-22
TWB286 - 5 2026-07-01
TWB933 - 4 2026-06-09
TWB932 - 4 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB312 KIX → KIX Jul 14, 02:00 UTCJul 14, 08:55 UTC6h 55m
2026-07-13 TWB311 - Jul 13, 23:05 UTCJul 14, 00:05 UTC1h 0m
2026-07-13 TWB664 - Jul 13, 18:20 UTCJul 13, 20:15 UTC1h 55m
2026-07-13 TWB663 - Jul 13, 14:05 UTCJul 13, 15:55 UTC1h 50m
2026-07-13 TWB216 - Jul 13, 10:45 UTCJul 13, 11:25 UTC40m
2026-07-13 TWB215 - Jul 13, 08:15 UTCJul 13, 08:40 UTC25m
2026-07-13 TWB214 - Jul 13, 05:55 UTCJul 13, 06:15 UTC20m
2026-07-12 TWB213 - Jul 12, 23:10 UTCJul 12, 23:35 UTC25m
2026-07-12 TWB664 - Jul 12, 18:15 UTCJul 12, 20:01 UTC1h 45m
2026-07-12 TWB663 - Jul 12, 14:10 UTCJul 12, 16:10 UTC2h 0m
2026-07-12 TWB314 - Jul 12, 10:50 UTCJul 12, 11:20 UTC30m
2026-07-12 TWB305 ICN → KIX Jul 12, 07:15 UTCJul 12, 08:35 UTC1h 20m
2026-07-12 TWB242 NRT → ICN Jul 12, 03:30 UTCJul 12, 05:30 UTC2h 0m
2026-07-12 TWB241 ICN → NRT Jul 12, 00:10 UTCJul 12, 02:10 UTC2h 0m
2026-07-11 TWB3630 - Jul 11, 11:15 UTCJul 11, 11:45 UTC30m
2026-07-11 TWB9657 - Jul 11, 04:01 UTCJul 11, 09:35 UTC5h 35m
2026-07-11 TWB3629 - Jul 11, 02:05 UTCJul 11, 02:25 UTC20m
2026-07-10 TWB013 ICN → ICN Jul 10, 13:00 UTCJul 10, 22:50 UTC9h 50m
2026-07-10 TWB672 KHH → ICN Jul 10, 08:20 UTCJul 10, 10:50 UTC2h 30m
2026-07-10 TWB671 ICN → KHH Jul 10, 04:30 UTCJul 10, 07:00 UTC2h 30m
2026-07-10 TWB288 - Jul 10, 01:30 UTCJul 10, 02:55 UTC1h 25m
2026-07-09 TWB287 - Jul 9, 23:05 UTCJul 10, 00:05 UTC1h 0m
2026-07-09 TWB616 - Jul 9, 19:05 UTCJul 9, 19:35 UTC30m
2026-07-09 TWB615 - Jul 9, 13:10 UTCJul 9, 13:35 UTC25m
2026-07-09 TWB672 KHH → ICN Jul 9, 08:10 UTCJul 9, 10:40 UTC2h 30m
2026-07-09 TWB671 ICN → KHH Jul 9, 04:35 UTCJul 9, 07:00 UTC2h 25m
2026-07-08 TWB608 - Jul 8, 13:55 UTCJul 8, 14:25 UTC30m
2026-07-08 TWB607 - Jul 8, 10:40 UTCJul 8, 10:55 UTC15m
2026-07-08 TWB126 - Jul 8, 05:10 UTCJul 8, 09:00 UTC3h 50m
2026-07-08 TWB125 - Jul 8, 01:10 UTCJul 8, 03:25 UTC2h 15m
2026-07-07 TWB125 - Jul 7, 23:50 UTCJul 8, 00:20 UTC30m
2026-07-07 TWB608 - Jul 7, 14:15 UTCJul 7, 14:30 UTC15m
2026-07-07 TWB607 - Jul 7, 11:00 UTCJul 7, 11:15 UTC15m
2026-07-06 TWB014 ICN → ICN Jul 6, 13:05 UTCJul 6, 22:45 UTC9h 40m
2026-07-06 TWB672 KHH → ICN Jul 6, 08:15 UTCJul 6, 10:50 UTC2h 35m
2026-07-06 TWB671 ICN → KHH Jul 6, 04:35 UTCJul 6, 07:05 UTC2h 30m
2026-07-06 TWB288 - Jul 6, 02:15 UTCJul 6, 03:15 UTC1h 0m
2026-07-05 TWB287 - Jul 5, 23:00 UTCJul 6, 00:00 UTC1h 0m
2026-07-05 TWB616 - Jul 5, 19:15 UTCJul 5, 19:40 UTC25m
2026-07-05 TWB615 - Jul 5, 13:15 UTCJul 5, 13:35 UTC20m
2026-07-05 TWB670 - Jul 5, 09:25 UTCJul 5, 11:35 UTC2h 10m
2026-07-05 TWB669 - Jul 5, 05:15 UTCJul 5, 07:25 UTC2h 10m
2026-07-04 TWB3630 - Jul 4, 11:05 UTCJul 4, 11:30 UTC25m
2026-07-04 TWB9657 - Jul 4, 04:15 UTCJul 4, 09:35 UTC5h 20m
2026-07-04 TWB3629 - Jul 4, 02:25 UTCJul 4, 02:45 UTC20m
2026-07-03 TWB013 ICN → ICN Jul 3, 13:00 UTCJul 3, 23:25 UTC10h 25m
2026-07-03 TWB672 KHH → ICN Jul 3, 08:15 UTCJul 3, 10:55 UTC2h 40m
2026-07-03 TWB671 ICN → KHH Jul 3, 04:20 UTCJul 3, 07:05 UTC2h 45m
2026-07-02 TWB013 ICN → ICN Jul 2, 13:05 UTCJul 2, 23:10 UTC10h 5m
2026-07-01 TWB013 ICN → ICN Jul 1, 13:00 UTCJul 1, 23:20 UTC10h 20m

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 HL8300 page for operator, model, and routing details .

Mode-S 71C300 frequently asked

What is Mode-S code 71C300?
71C300 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8300.
Where is Mode-S 71C300 registered?
Mode-S code 71C300 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 71C300 broadcasting right now?
Yes. Mode-S 71C300 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C300, octal 34341400, decimal 7,455,488.
What flights does 71C300 operate?
Mode-S 71C300 has broadcast 20 distinct callsigns, including TWB126, TWB125, TWB672, TWB669, TWB287.