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
Broadcasting now · callsign TWB243 · 33,000 ft
Flights observed
160
Distinct callsigns
20
Country
KR
Last broadcast
17h ago

Current position

71C030 is currently broadcasting. Map zoomed to live position.

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
TWB126 Tway Airlines 13 2026-05-29
TWB125 Tway Airlines 13 2026-05-28
TWB013 Tway Airlines 5 2026-05-24
TWB707 Tway Airlines 4 2026-04-17
TWB208 Tway Airlines 4 2026-05-28
TWB207 Tway Airlines 4 2026-05-28
TWB736 - 3 2026-04-17
TWB727 Tway Airlines 3 2026-05-01
TWB720 Tway Airlines 3 2026-04-29
TWB670 Tway Airlines 3 2026-05-20
TWB669 Tway Airlines 3 2026-05-20
TWB286 Tway Airlines 3 2026-05-20
TWB285 Tway Airlines 3 2026-05-19
TWB037 Tway Airlines 3 2026-05-05
TWB908 Tway Airlines 2 2026-04-25
TWB903 Tway Airlines 2 2026-04-26
TWB901 Tway Airlines 2 2026-04-25
TWB807 Tway Airlines 2 2026-04-25
TWB805 Tway Airlines 2 2026-04-29
TWB735 Tway Airlines 2 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 TWB126 KLO → ICN May 29, 05:00 UTCMay 29, 08:40 UTC3h 40m
2026-05-28 TWB125 ICN → KLO May 28, 23:50 UTCMay 29, 03:20 UTC3h 30m
2026-05-28 TWB208 FUK → ICN May 28, 12:45 UTCMay 28, 13:20 UTC35m
2026-05-28 TWB207 ICN → FUK May 28, 09:15 UTCMay 28, 10:15 UTC1h 0m
2026-05-28 TWB354 - May 28, 05:20 UTCMay 28, 06:50 UTC1h 30m
2026-05-28 TWB353 - May 28, 02:15 UTCMay 28, 03:35 UTC1h 20m
2026-05-27 TWB014 DAD → ICN May 27, 13:05 UTCMay 28, 00:10 UTC11h 5m
2026-05-27 TWB126 KLO → ICN May 27, 05:04 UTCMay 27, 09:00 UTC3h 55m
2026-05-26 TWB125 ICN → KLO May 26, 23:49 UTCMay 27, 03:20 UTC3h 30m
2026-05-26 TWB126 KLO → ICN May 26, 05:15 UTCMay 26, 08:54 UTC3h 40m
2026-05-25 TWB125 ICN → KLO May 25, 23:49 UTCMay 26, 03:19 UTC3h 30m
2026-05-24 TWB013 ICN → DAD May 24, 13:00 UTCMay 24, 23:35 UTC10h 35m
2026-05-24 TWB126 KLO → ICN May 24, 05:10 UTCMay 24, 08:55 UTC3h 45m
2026-05-24 TWB125 ICN → KLO May 24, 00:00 UTCMay 24, 03:30 UTC3h 30m
2026-05-23 TWB126 KLO → ICN May 23, 05:20 UTCMay 23, 09:00 UTC3h 40m
2026-05-23 TWB125 ICN → KLO May 23, 00:05 UTCMay 23, 03:40 UTC3h 34m
2026-05-22 TWB126 KLO → ICN May 22, 05:10 UTCMay 22, 08:50 UTC3h 40m
2026-05-21 TWB125 ICN → KLO May 21, 23:50 UTCMay 22, 03:25 UTC3h 35m
2026-05-21 TWB208 FUK → ICN May 21, 11:55 UTCMay 21, 12:55 UTC1h 0m
2026-05-21 TWB207 ICN → FUK May 21, 09:25 UTCMay 21, 09:55 UTC30m
2026-05-21 TWB244 NRT → ICN May 21, 06:00 UTCMay 21, 08:00 UTC2h 0m
2026-05-21 TWB243 ICN → NRT May 21, 01:40 UTCMay 21, 03:30 UTC1h 50m
2026-05-20 TWB670 RMQ → ICN May 20, 09:15 UTCMay 20, 11:25 UTC2h 10m
2026-05-20 TWB669 ICN → RMQ May 20, 05:10 UTCMay 20, 07:20 UTC2h 10m
2026-05-20 TWB286 HSG → ICN May 20, 01:45 UTCMay 20, 02:45 UTC1h 0m
2026-05-19 TWB285 ICN → HSG May 19, 23:25 UTCMay 19, 23:55 UTC30m
2026-05-19 TWB354 - May 19, 05:40 UTCMay 19, 07:00 UTC1h 20m
2026-05-19 TWB353 - May 19, 02:30 UTCMay 19, 03:40 UTC1h 10m
2026-05-18 TWB013 ICN → DAD May 18, 13:00 UTCMay 18, 22:55 UTC9h 54m
2026-05-18 TWB126 KLO → ICN May 18, 05:05 UTCMay 18, 08:55 UTC3h 50m
2026-05-17 TWB125 ICN → KLO May 17, 23:55 UTCMay 18, 03:20 UTC3h 25m
2026-05-17 TWB126 KLO → ICN May 17, 05:10 UTCMay 17, 09:10 UTC4h 0m
2026-05-16 TWB125 ICN → KLO May 16, 23:55 UTCMay 17, 03:30 UTC3h 35m
2026-05-16 TWB126 KLO → ICN May 16, 05:15 UTCMay 16, 09:16 UTC4h 1m
2026-05-15 TWB125 ICN → KLO May 15, 23:50 UTCMay 16, 03:30 UTC3h 40m
2026-05-15 TWB644 HKG → ICN May 15, 07:50 UTCMay 15, 11:00 UTC3h 10m
2026-05-15 TWB643 ICN → HKG May 15, 00:10 UTCMay 15, 03:35 UTC3h 25m
2026-05-14 TWB126 KLO → ICN May 14, 05:05 UTCMay 14, 08:40 UTC3h 35m
2026-05-13 TWB125 ICN → KLO May 13, 23:45 UTCMay 14, 03:25 UTC3h 40m
2026-05-13 TWB670 RMQ → ICN May 13, 09:05 UTCMay 13, 11:15 UTC2h 10m
2026-05-13 TWB669 ICN → RMQ May 13, 05:15 UTCMay 13, 07:25 UTC2h 10m
2026-05-13 TWB286 HSG → ICN May 13, 01:40 UTCMay 13, 02:35 UTC55m
2026-05-12 TWB285 ICN → HSG May 12, 23:15 UTCMay 13, 00:10 UTC55m
2026-05-12 TWB208 FUK → ICN May 12, 11:40 UTCMay 12, 12:35 UTC55m
2026-05-12 TWB207 ICN → FUK May 12, 09:30 UTCMay 12, 10:00 UTC30m
2026-05-12 TWB304 KIX → ICN May 12, 05:40 UTCMay 12, 07:00 UTC1h 20m
2026-05-12 TWB303 ICN → KIX May 12, 03:00 UTCMay 12, 03:35 UTC35m
2026-05-11 TWB013 ICN → DAD May 11, 13:05 UTCMay 11, 22:35 UTC9h 30m
2026-05-11 TWB126 KLO → ICN May 11, 05:15 UTCMay 11, 09:05 UTC3h 50m
2026-05-10 TWB125 ICN → KLO May 10, 23:50 UTCMay 11, 03:25 UTC3h 35m

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?
Yes. Mode-S 71C030 is currently airborne.
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 TWB126, TWB125, TWB013, TWB707, TWB208.