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 Jul 26, 12:10 UTC
Flights observed
196
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 12:10 UTC

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
TWB669 - 6 2026-07-16
TWB244 Tway Airlines 6 2026-07-21
TWB243 Tway Airlines 6 2026-07-21
TWB242 - 6 2026-07-17
TWB216 - 6 2026-06-27
TWB670 - 5 2026-07-16
TWB314 - 5 2026-06-23
TWB313 - 5 2026-06-30
TWB306 - 5 2026-06-30
TWB305 - 5 2026-06-23
TWB241 - 5 2026-07-16
TWB672 - 4 2026-06-20
TWB671 - 4 2026-06-20
TWB312 - 4 2026-06-30
TWB311 Tway Airlines 4 2026-06-29
TWB215 - 4 2026-06-27
TWB208 - 4 2026-07-15
TWB207 - 4 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB246 NRT → ICN Jul 26, 10:10 UTCJul 26, 12:10 UTC2h 0m
2026-07-26 TWB245 ICN → NRT Jul 26, 06:55 UTCJul 26, 08:45 UTC1h 50m
2026-07-25 TWB055 ICN → PQC Jul 25, 12:40 UTCJul 26, 00:50 UTC12h 10m
2026-07-25 TWB606 TNA → ICN Jul 25, 08:40 UTCJul 25, 09:00 UTC20m
2026-07-25 TWB605 ICN → TNA Jul 25, 05:00 UTCJul 25, 05:20 UTC20m
2026-07-24 TWB034 CXR → ICN Jul 24, 10:30 UTCJul 24, 21:30 UTC11h 0m
2026-07-24 TWB644 HKG → ICN Jul 24, 05:25 UTCJul 24, 08:40 UTC3h 15m
2026-07-24 TWB643 ICN → HKG Jul 24, 00:25 UTCJul 24, 03:45 UTC3h 20m
2026-07-23 TWB608 TAO → ICN Jul 23, 14:15 UTCJul 23, 14:45 UTC30m
2026-07-23 TWB607 - Jul 23, 11:10 UTCJul 23, 11:40 UTC30m
2026-07-23 TWB206 FUK → ICN Jul 23, 08:40 UTCJul 23, 09:40 UTC1h 0m
2026-07-23 TWB205 ICN → FUK Jul 23, 06:20 UTCJul 23, 07:15 UTC55m
2026-07-23 TWB302 KIX → ICN Jul 23, 03:05 UTCJul 23, 04:25 UTC1h 20m
2026-07-22 TWB301 ICN → KIX Jul 22, 23:25 UTCJul 23, 00:50 UTC1h 25m
2026-07-22 TWB9657 YNY → YNJ Jul 22, 04:45 UTCJul 22, 12:15 UTC7h 30m
2026-07-21 TWB608 TAO → ICN Jul 21, 14:00 UTCJul 21, 14:40 UTC40m
2026-07-21 TWB607 - Jul 21, 10:45 UTCJul 21, 11:15 UTC30m
2026-07-21 TWB244 NRT → ICN Jul 21, 06:00 UTCJul 21, 08:05 UTC2h 5m
2026-07-21 TWB243 ICN → NRT Jul 21, 02:00 UTCJul 21, 04:00 UTC2h 0m
2026-07-20 TWB033 ICN → CXR Jul 20, 10:25 UTCJul 20, 21:10 UTC10h 45m
2026-07-20 TWB244 NRT → ICN Jul 20, 05:50 UTCJul 20, 07:45 UTC1h 55m
2026-07-20 TWB243 ICN → NRT Jul 20, 02:00 UTCJul 20, 03:55 UTC1h 55m
2026-07-19 TWB056 - Jul 19, 22:55 UTCJul 19, 23:35 UTC40m
2026-07-19 TWB055 - Jul 19, 11:15 UTCJul 19, 21:45 UTC10h 30m
2026-07-18 TWB248 NRT → ICN Jul 18, 13:15 UTCJul 18, 15:05 UTC1h 50m
2026-07-18 TWB247 ICN → NRT Jul 18, 09:30 UTCJul 18, 11:20 UTC1h 50m
2026-07-18 TWB244 NRT → ICN Jul 18, 05:40 UTCJul 18, 07:35 UTC1h 55m
2026-07-18 TWB243 ICN → NRT Jul 18, 01:50 UTCJul 18, 03:45 UTC1h 56m
2026-07-17 TWB242 NRT → ICN Jul 17, 03:25 UTCJul 17, 05:20 UTC1h 55m
2026-07-16 TWB241 - Jul 16, 23:44 UTCJul 17, 01:39 UTC1h 55m
2026-07-16 TWB616 - Jul 16, 19:05 UTCJul 16, 19:35 UTC30m
2026-07-16 TWB615 - Jul 16, 13:40 UTCJul 16, 14:05 UTC25m
2026-07-16 TWB670 - Jul 16, 09:05 UTCJul 16, 11:15 UTC2h 10m
2026-07-16 TWB669 - Jul 16, 07:00 UTCJul 16, 07:25 UTC25m
2026-07-16 TWB669 - Jul 16, 05:15 UTCJul 16, 06:00 UTC45m
2026-07-15 TWB208 - Jul 15, 11:35 UTCJul 15, 12:30 UTC55m
2026-07-15 TWB207 - Jul 15, 09:15 UTCJul 15, 10:00 UTC45m
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

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 Jul 26, 12:10 UTC.
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, TWB669, TWB244, TWB243.