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 Jul 26, 12:25 UTC
Flights observed
358
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 12:25 UTC

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 Tway Airlines 26 2026-07-18
TWB126 - 25 2026-07-18
TWB669 - 9 2026-07-08
TWB670 - 8 2026-07-08
TWB286 - 8 2026-07-08
TWB285 - 8 2026-07-07
TWB013 - 8 2026-07-20
TWB663 Tway Airlines 7 2026-07-25
TWB208 - 7 2026-07-13
TWB207 - 7 2026-07-13
TWB672 Tway Airlines 6 2026-07-20
TWB608 Tway Airlines 6 2026-07-19
TWB607 - 6 2026-07-19
TWB707 Tway Airlines 5 2026-07-24
TWB671 Tway Airlines 5 2026-07-20
TWB664 Tway Airlines 5 2026-07-25
TWB313 Tway Airlines 5 2026-07-26
TWB312 - 5 2026-06-26
TWB311 Tway Airlines 5 2026-06-25
TWB306 Tway Airlines 5 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB306 KIX → ICN Jul 26, 10:55 UTCJul 26, 12:20 UTC1h 25m
2026-07-26 TWB313 TAE → KIX Jul 26, 08:25 UTCJul 26, 09:30 UTC1h 5m
2026-07-26 TWB214 FUK → TAE Jul 26, 06:35 UTCJul 26, 06:55 UTC20m
2026-07-26 TWB227 CJU → FUK Jul 26, 04:10 UTCJul 26, 04:45 UTC35m
2026-07-26 TWB228 FUK → CJU Jul 26, 02:05 UTCJul 26, 02:25 UTC20m
2026-07-25 TWB213 TAE → FUK Jul 25, 22:20 UTCJul 25, 22:45 UTC25m
2026-07-25 TWB664 TPE → TAE Jul 25, 18:10 UTCJul 25, 20:05 UTC1h 55m
2026-07-25 TWB663 TAE → TPE Jul 25, 15:50 UTCJul 25, 16:05 UTC15m
2026-07-25 TWB663 TAE → TPE Jul 25, 14:10 UTCJul 25, 14:35 UTC25m
2026-07-25 TWB510 GUM → KIX Jul 25, 11:45 UTCJul 25, 12:20 UTC35m
2026-07-25 TWB510 GUM → KIX Jul 25, 09:50 UTCJul 25, 10:05 UTC15m
2026-07-25 TWB509 KIX → GUM Jul 25, 02:00 UTCJul 25, 02:15 UTC15m
2026-07-24 TWB509 KIX → GUM Jul 24, 23:15 UTCJul 25, 00:20 UTC1h 5m
2026-07-24 TWB664 TPE → TAE Jul 24, 18:10 UTCJul 24, 20:00 UTC1h 50m
2026-07-24 TWB663 TAE → TPE Jul 24, 15:40 UTCJul 24, 16:10 UTC30m
2026-07-24 TWB663 TAE → TPE Jul 24, 14:05 UTCJul 24, 14:25 UTC20m
2026-07-24 TWB314 KIX → TAE Jul 24, 11:40 UTCJul 24, 12:10 UTC30m
2026-07-24 TWB313 TAE → KIX Jul 24, 08:25 UTCJul 24, 09:00 UTC35m
2026-07-24 TWB214 FUK → TAE Jul 24, 06:05 UTCJul 24, 06:30 UTC25m
2026-07-24 TWB227 CJU → FUK Jul 24, 03:55 UTCJul 24, 04:20 UTC25m
2026-07-24 TWB707 GMP → CJU Jul 24, 01:00 UTCJul 24, 01:35 UTC35m
2026-07-23 TWB702 CJU → GMP Jul 23, 23:15 UTCJul 23, 23:55 UTC40m
2026-07-23 TWB801 TAE → CJU Jul 23, 21:25 UTCJul 23, 21:40 UTC15m
2026-07-23 TWB812 - Jul 23, 13:05 UTCJul 23, 13:20 UTC15m
2026-07-23 TWB811 - Jul 23, 10:55 UTCJul 23, 11:15 UTC20m
2026-07-23 TWB806 CJU → TAE Jul 23, 09:20 UTCJul 23, 09:40 UTC20m
2026-07-23 TWB725 GMP → CJU Jul 23, 06:30 UTCJul 23, 07:15 UTC45m
2026-07-23 TWB716 CJU → GMP Jul 23, 04:15 UTCJul 23, 04:55 UTC40m
2026-07-23 TWB709 GMP → CJU Jul 23, 02:00 UTCJul 23, 02:35 UTC35m
2026-07-23 TWB706 - Jul 23, 00:20 UTCJul 23, 01:00 UTC40m
2026-07-22 TWB703 - Jul 22, 22:10 UTCJul 22, 22:45 UTC35m
2026-07-22 TWB734 - Jul 22, 12:15 UTCJul 22, 12:50 UTC35m
2026-07-22 TWB720 - Jul 22, 04:55 UTCJul 22, 05:25 UTC30m
2026-07-22 TWB228 FUK → CJU Jul 22, 01:35 UTCJul 22, 02:00 UTC25m
2026-07-21 TWB213 TAE → FUK Jul 21, 23:30 UTCJul 21, 23:55 UTC25m
2026-07-21 TWB038 - Jul 21, 11:00 UTCJul 21, 21:35 UTC10h 35m
2026-07-21 TWB683 - Jul 21, 02:10 UTCJul 21, 08:10 UTC6h 0m
2026-07-20 TWB013 - Jul 20, 13:15 UTCJul 20, 23:20 UTC10h 5m
2026-07-20 TWB672 KHH → ICN Jul 20, 08:10 UTCJul 20, 10:45 UTC2h 35m
2026-07-20 TWB671 ICN → KHH Jul 20, 04:30 UTCJul 20, 07:00 UTC2h 30m
2026-07-19 TWB608 TAO → ICN Jul 19, 13:55 UTCJul 19, 14:20 UTC25m
2026-07-19 TWB607 - Jul 19, 10:35 UTCJul 19, 11:00 UTC25m
2026-07-19 TWB606 - Jul 19, 08:35 UTCJul 19, 08:55 UTC20m
2026-07-19 TWB605 - Jul 19, 04:35 UTCJul 19, 04:55 UTC20m
2026-07-18 TWB9636 - Jul 18, 11:55 UTCJul 18, 18:25 UTC6h 30m
2026-07-18 TWB126 - Jul 18, 05:45 UTCJul 18, 09:30 UTC3h 45m
2026-07-18 TWB125 ICN → KLO Jul 18, 00:04 UTCJul 18, 03:40 UTC3h 36m
2026-07-17 TWB608 - Jul 17, 14:10 UTCJul 17, 14:35 UTC25m
2026-07-17 TWB607 - Jul 17, 10:35 UTCJul 17, 11:00 UTC25m
2026-07-17 TWB126 - Jul 17, 05:15 UTCJul 17, 09:04 UTC3h 50m

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 Jul 26, 12:25 UTC.
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.