Apparatus

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sensors Mode-S transponder

71C306

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

Currently assigned to HL8306 · BOEING 737-800

Hex
71C306
Octal
34341406
Decimal
7,455,494
Country
KR
Tail
HL8306
Type
B738
No current signal · last broadcast 2h ago
Flights observed
159
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C306.

Country allocation

The ICAO 24-bit address 71C306 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
TWB252 - 11 2026-06-27
TWB251 - 10 2026-06-27
TWB216 - 6 2026-06-27
TWB314 - 5 2026-06-23
TWB313 - 5 2026-06-30
TWB306 - 5 2026-06-30
TWB305 - 5 2026-06-23
TWB242 Tway Airlines 5 2026-04-27
TWB672 - 4 2026-06-20
TWB671 - 4 2026-06-20
TWB670 - 4 2026-07-01
TWB669 - 4 2026-07-01
TWB312 - 4 2026-06-30
TWB311 Tway Airlines 4 2026-06-29
TWB241 Tway Airlines 4 2026-04-27
TWB215 - 4 2026-06-27
TWB683 - 3 2026-06-28
TWB288 Tway Airlines 3 2026-05-06
TWB287 Tway Airlines 3 2026-05-05
TWB244 Tway Airlines 3 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB606 - Jul 14, 08:50 UTCJul 14, 09:35 UTC45m
2026-07-14 TWB605 - Jul 14, 04:45 UTCJul 14, 05:05 UTC20m
2026-07-13 TWB282 - Jul 13, 06:20 UTCJul 13, 08:10 UTC1h 50m
2026-07-13 TWB281 - Jul 13, 02:20 UTCJul 13, 04:05 UTC1h 45m
2026-07-12 TWB208 - Jul 12, 11:55 UTCJul 12, 12:55 UTC1h 0m
2026-07-12 TWB207 - Jul 12, 09:10 UTCJul 12, 09:55 UTC45m
2026-07-12 TWB9674 - Jul 12, 03:45 UTCJul 12, 06:05 UTC2h 20m
2026-07-11 TWB9673 - Jul 11, 23:55 UTCJul 12, 02:01 UTC2h 5m
2026-07-08 TWB208 - Jul 8, 11:40 UTCJul 8, 12:40 UTC1h 0m
2026-07-08 TWB207 - Jul 8, 09:15 UTCJul 8, 10:10 UTC55m
2026-07-08 TWB304 KIX → ICN Jul 8, 05:45 UTCJul 8, 07:10 UTC1h 25m
2026-07-08 TWB303 ICN → KIX Jul 8, 02:15 UTCJul 8, 03:50 UTC1h 35m
2026-07-04 TWB608 - Jul 4, 14:15 UTCJul 4, 14:45 UTC30m
2026-07-04 TWB607 - Jul 4, 10:30 UTCJul 4, 10:55 UTC25m
2026-07-04 TWB606 - Jul 4, 08:15 UTCJul 4, 08:40 UTC25m
2026-07-04 TWB605 - Jul 4, 04:30 UTCJul 4, 04:45 UTC15m
2026-07-02 TWB208 - Jul 2, 11:45 UTCJul 2, 12:40 UTC55m
2026-07-02 TWB207 - Jul 2, 09:15 UTCJul 2, 09:55 UTC40m
2026-07-01 TWB670 - Jul 1, 09:25 UTCJul 1, 11:30 UTC2h 5m
2026-07-01 TWB669 - Jul 1, 05:30 UTCJul 1, 07:50 UTC2h 20m
2026-06-30 TWB306 KIX → ICN Jun 30, 10:50 UTCJun 30, 12:10 UTC1h 20m
2026-06-30 TWB313 - Jun 30, 08:10 UTCJun 30, 09:05 UTC55m
2026-06-30 TWB312 - Jun 30, 02:05 UTCJun 30, 03:10 UTC1h 5m
2026-06-29 TWB311 TAE → KIX Jun 29, 23:19 UTCJun 29, 23:54 UTC35m
2026-06-28 TWB683 - Jun 28, 02:14 UTCJun 28, 08:00 UTC5h 45m
2026-06-27 TWB216 - Jun 27, 10:34 UTCJun 27, 11:09 UTC35m
2026-06-27 TWB215 - Jun 27, 08:20 UTCJun 27, 08:35 UTC15m
2026-06-27 TWB252 - Jun 27, 04:59 UTCJun 27, 06:44 UTC1h 45m
2026-06-27 TWB251 - Jun 27, 02:04 UTCJun 27, 03:20 UTC1h 15m
2026-06-26 TWB216 - Jun 26, 10:44 UTCJun 26, 11:24 UTC40m
2026-06-26 TWB215 - Jun 26, 08:54 UTCJun 26, 09:10 UTC15m
2026-06-26 TWB252 - Jun 26, 06:00 UTCJun 26, 07:45 UTC1h 45m
2026-06-26 TWB251 - Jun 26, 02:09 UTCJun 26, 03:15 UTC1h 5m
2026-06-25 TWB214 - Jun 25, 06:00 UTCJun 25, 06:40 UTC40m
2026-06-25 TWB227 - Jun 25, 03:59 UTCJun 25, 04:14 UTC15m
2026-06-25 TWB228 - Jun 25, 01:50 UTCJun 25, 02:10 UTC20m
2026-06-24 TWB213 TAE → FUK Jun 24, 23:24 UTCJun 24, 23:40 UTC15m
2026-06-23 TWB314 - Jun 23, 10:44 UTCJun 23, 11:49 UTC1h 5m
2026-06-23 TWB305 ICN → KIX Jun 23, 07:05 UTCJun 23, 08:25 UTC1h 20m
2026-06-20 TWB013 ICN → ICN Jun 20, 12:59 UTCJun 20, 22:45 UTC9h 45m
2026-06-20 TWB672 KHH → ICN Jun 20, 08:25 UTCJun 20, 10:55 UTC2h 30m
2026-06-20 TWB671 ICN → KHH Jun 20, 04:29 UTCJun 20, 07:00 UTC2h 30m
2026-06-19 TWB034 ICN → ICN Jun 19, 10:09 UTCJun 19, 21:14 UTC11h 5m
2026-06-17 TWB306 - Jun 17, 10:45 UTCJun 17, 12:15 UTC1h 30m
2026-06-17 TWB313 - Jun 17, 08:15 UTCJun 17, 09:00 UTC45m
2026-06-16 TWB216 - Jun 16, 10:25 UTCJun 16, 11:10 UTC45m
2026-06-16 TWB215 - Jun 16, 08:25 UTCJun 16, 08:49 UTC25m
2026-06-16 TWB252 - Jun 16, 06:30 UTCJun 16, 06:54 UTC25m
2026-06-16 TWB252 - Jun 16, 05:05 UTCJun 16, 05:59 UTC55m
2026-06-16 TWB251 - Jun 16, 02:20 UTCJun 16, 03:25 UTC1h 5m

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 HL8306 page for operator, model, and routing details .

Mode-S 71C306 frequently asked

What is Mode-S code 71C306?
71C306 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8306.
Where is Mode-S 71C306 registered?
Mode-S code 71C306 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 71C306 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C306, octal 34341406, decimal 7,455,494.
What flights does 71C306 operate?
Mode-S 71C306 has broadcast 20 distinct callsigns, including TWB252, TWB251, TWB216, TWB314, TWB313.