Apparatus

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sensors Mode-S transponder

71C030

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

Currently assigned to HL8030 · BOEING 737-800

Hex
71C030
Octal
34340060
Decimal
7,454,768
Country
KR
Tail
HL8030
Type
B738
No current signal · last broadcast 1h ago
Flights observed
297
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C030.

Country allocation

The ICAO 24-bit address 71C030 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
TWB125 - 23 2026-07-10
TWB126 - 22 2026-07-11
TWB669 - 9 2026-07-08
TWB670 - 8 2026-07-08
TWB286 - 8 2026-07-08
TWB285 - 8 2026-07-07
TWB208 - 7 2026-07-13
TWB207 - 7 2026-07-13
TWB013 Tway Airlines 7 2026-06-15
TWB312 - 5 2026-06-26
TWB311 Tway Airlines 5 2026-06-25
TWB244 - 5 2026-06-18
TWB243 - 5 2026-06-18
TWB707 Tway Airlines 4 2026-04-17
TWB672 - 4 2026-07-07
TWB671 - 4 2026-07-14
TWB306 - 4 2026-06-26
TWB736 - 3 2026-04-17
TWB727 Tway Airlines 3 2026-05-01
TWB720 Tway Airlines 3 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB671 - Jul 14, 04:30 UTCJul 14, 06:00 UTC1h 30m
2026-07-13 TWB208 - Jul 13, 11:45 UTCJul 13, 12:50 UTC1h 5m
2026-07-13 TWB207 - Jul 13, 09:25 UTCJul 13, 10:10 UTC45m
2026-07-12 TWB9676 KHH → ICN Jul 12, 08:10 UTCJul 12, 10:30 UTC2h 20m
2026-07-12 TWB9675 - Jul 12, 06:05 UTCJul 12, 07:01 UTC55m
2026-07-12 TWB3001 - Jul 12, 02:45 UTCJul 12, 03:30 UTC45m
2026-07-11 TWB608 - Jul 11, 15:05 UTCJul 11, 15:35 UTC30m
2026-07-11 TWB607 - Jul 11, 11:55 UTCJul 11, 12:10 UTC15m
2026-07-11 TWB126 - Jul 11, 06:30 UTCJul 11, 10:20 UTC3h 50m
2026-07-10 TWB125 - Jul 10, 23:50 UTCJul 11, 04:05 UTC4h 15m
2026-07-10 TWB608 - Jul 10, 14:10 UTCJul 10, 14:40 UTC30m
2026-07-10 TWB607 - Jul 10, 10:50 UTCJul 10, 11:15 UTC25m
2026-07-10 TWB606 - Jul 10, 09:00 UTCJul 10, 09:20 UTC20m
2026-07-10 TWB605 - Jul 10, 05:00 UTCJul 10, 05:20 UTC20m
2026-07-09 TWB014 ICN → ICN Jul 9, 13:00 UTCJul 9, 22:45 UTC9h 45m
2026-07-09 TWB606 - Jul 9, 08:40 UTCJul 9, 09:10 UTC30m
2026-07-09 TWB605 - Jul 9, 04:55 UTCJul 9, 05:20 UTC25m
2026-07-08 TWB670 - Jul 8, 10:00 UTCJul 8, 12:10 UTC2h 10m
2026-07-08 TWB669 - Jul 8, 06:35 UTCJul 8, 08:40 UTC2h 5m
2026-07-08 TWB286 - Jul 8, 01:45 UTCJul 8, 02:50 UTC1h 5m
2026-07-07 TWB285 - Jul 7, 23:30 UTCJul 8, 00:35 UTC1h 5m
2026-07-07 TWB672 KHH → ICN Jul 7, 09:35 UTCJul 7, 12:00 UTC2h 25m
2026-07-07 TWB671 ICN → KHH Jul 7, 05:45 UTCJul 7, 08:25 UTC2h 40m
2026-07-06 TWB670 - Jul 6, 09:10 UTCJul 6, 11:25 UTC2h 15m
2026-07-06 TWB669 - Jul 6, 05:15 UTCJul 6, 07:25 UTC2h 10m
2026-07-06 TWB286 - Jul 6, 01:55 UTCJul 6, 03:10 UTC1h 15m
2026-07-05 TWB285 - Jul 5, 23:35 UTCJul 6, 00:40 UTC1h 5m
2026-07-05 TWB126 - Jul 5, 05:25 UTCJul 5, 09:20 UTC3h 55m
2026-07-05 TWB125 - Jul 5, 00:10 UTCJul 5, 03:45 UTC3h 35m
2026-07-04 TWB9636 - Jul 4, 17:55 UTCJul 4, 18:15 UTC20m
2026-07-04 TWB9635 - Jul 4, 11:50 UTCJul 4, 12:05 UTC15m
2026-07-04 TWB126 - Jul 4, 05:05 UTCJul 4, 08:45 UTC3h 40m
2026-07-03 TWB125 - Jul 3, 23:50 UTCJul 4, 03:25 UTC3h 35m
2026-07-03 TWB670 - Jul 3, 09:10 UTCJul 3, 11:30 UTC2h 20m
2026-07-03 TWB669 - Jul 3, 05:20 UTCJul 3, 07:45 UTC2h 25m
2026-07-03 TWB286 - Jul 3, 01:45 UTCJul 3, 02:50 UTC1h 5m
2026-07-02 TWB285 - Jul 2, 23:30 UTCJul 3, 00:25 UTC55m
2026-07-02 TWB608 - Jul 2, 13:50 UTCJul 2, 14:20 UTC30m
2026-07-02 TWB607 - Jul 2, 10:35 UTCJul 2, 11:00 UTC25m
2026-07-02 TWB126 - Jul 2, 05:10 UTCJul 2, 09:00 UTC3h 50m
2026-07-01 TWB125 - Jul 1, 23:45 UTCJul 2, 03:20 UTC3h 35m
2026-07-01 TWB9636 - Jul 1, 17:40 UTCJul 1, 18:05 UTC25m
2026-07-01 TWB9635 - Jul 1, 12:00 UTCJul 1, 12:25 UTC25m
2026-07-01 TWB126 - Jul 1, 05:20 UTCJul 1, 09:05 UTC3h 45m
2026-07-01 TWB125 - Jul 1, 00:00 UTCJul 1, 03:30 UTC3h 30m
2026-06-30 TWB616 WUH → ICN Jun 30, 19:20 UTCJun 30, 19:40 UTC20m
2026-06-30 TWB615 ICN → WUH Jun 30, 13:10 UTCJun 30, 13:30 UTC20m
2026-06-28 TWB126 - Jun 28, 05:15 UTCJun 28, 09:05 UTC3h 50m
2026-06-28 TWB125 - Jun 28, 02:44 UTCJun 28, 03:25 UTC40m
2026-06-27 TWB125 - Jun 27, 23:50 UTCJun 28, 00:20 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 HL8030 page for operator, model, and routing details .

Mode-S 71C030 frequently asked

What is Mode-S code 71C030?
71C030 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8030.
Where is Mode-S 71C030 registered?
Mode-S code 71C030 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 71C030 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C030, octal 34340060, decimal 7,454,768.
What flights does 71C030 operate?
Mode-S 71C030 has broadcast 20 distinct callsigns, including TWB125, TWB126, TWB669, TWB670, TWB286.