Apparatus

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sensors Mode-S transponder

71C738

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

Currently assigned to HL8738 · BOEING 737-800

Hex
71C738
Octal
34343470
Decimal
7,456,568
Country
KR
Tail
HL8738
Type
B738
No current signal · last broadcast 20h ago
Flights observed
147
Distinct callsigns
20
Country
KR
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 71C738.

Country allocation

The ICAO 24-bit address 71C738 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
TWB707 Tway Airlines 5 2026-05-04
TWB728 Tway Airlines 4 2026-04-30
TWB670 Tway Airlines 4 2026-05-18
TWB669 Tway Airlines 4 2026-05-18
TWB664 Tway Airlines 4 2026-05-25
TWB286 Tway Airlines 4 2026-05-18
TWB285 Tway Airlines 4 2026-05-17
TWB927 Tway Airlines 3 2026-05-01
TWB905 Tway Airlines 3 2026-04-30
TWB904 Tway Airlines 3 2026-04-30
TWB736 - 3 2026-04-30
TWB735 Tway Airlines 3 2026-04-30
TWB312 Tway Airlines 3 2026-05-29
TWB305 Tway Airlines 3 2026-05-28
TWB922 Tway Airlines 2 2026-05-03
TWB850 - 2 2026-05-04
TWB843 Tway Airlines 2 2026-05-05
TWB842 Tway Airlines 2 2026-04-15
TWB810 Tway Airlines 2 2026-04-29
TWB702 Tway Airlines 2 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 TWB312 KIX → TAE May 29, 03:50 UTCMay 29, 04:25 UTC35m
2026-05-28 TWB314 KIX → TAE May 28, 10:45 UTCMay 29, 00:05 UTC13h 20m
2026-05-28 TWB305 ICN → KIX May 28, 07:00 UTCMay 28, 08:25 UTC1h 25m
2026-05-28 TWB242 NRT → ICN May 28, 03:25 UTCMay 28, 05:25 UTC2h 0m
2026-05-27 TWB241 ICN → NRT May 27, 23:50 UTCMay 28, 01:40 UTC1h 50m
2026-05-27 TWB306 KIX → ICN May 27, 10:55 UTCMay 27, 12:15 UTC1h 20m
2026-05-27 TWB313 TAE → KIX May 27, 08:20 UTCMay 27, 08:55 UTC35m
2026-05-27 TWB214 FUK → TAE May 27, 05:59 UTCMay 27, 06:40 UTC40m
2026-05-26 TWB352 - May 26, 08:39 UTCMay 26, 09:09 UTC30m
2026-05-26 TWB351 TAE → TOY May 26, 06:34 UTCMay 26, 07:05 UTC30m
2026-05-25 TWB664 TPE → TAE May 25, 19:54 UTCMay 25, 20:09 UTC15m
2026-05-25 TWB664 TPE → TAE May 25, 18:10 UTCMay 25, 18:40 UTC30m
2026-05-25 TWB663 TAE → TPE May 25, 15:40 UTCMay 25, 16:10 UTC30m
2026-05-25 TWB215 TAE → FUK May 25, 08:25 UTCMay 25, 08:35 UTC10m
2026-05-25 TWB252 NRT → TAE May 25, 05:05 UTCMay 25, 06:10 UTC1h 5m
2026-05-25 TWB251 TAE → NRT May 25, 02:10 UTCMay 25, 03:25 UTC1h 15m
2026-05-24 TWB216 NRT → ICN May 24, 10:35 UTCMay 24, 11:15 UTC40m
2026-05-24 TWB252 NRT → TAE May 24, 05:05 UTCMay 24, 06:55 UTC1h 50m
2026-05-24 TWB251 TAE → NRT May 24, 02:05 UTCMay 24, 03:15 UTC1h 10m
2026-05-23 TWB352 - May 23, 08:45 UTCMay 23, 10:00 UTC1h 15m
2026-05-23 TWB351 TAE → TOY May 23, 06:20 UTCMay 23, 06:50 UTC30m
2026-05-23 TWB312 KIX → TAE May 23, 01:55 UTCMay 23, 03:00 UTC1h 4m
2026-05-22 TWB311 TAE → KIX May 22, 23:25 UTCMay 23, 00:05 UTC40m
2026-05-22 TWB664 TPE → TAE May 22, 19:50 UTCMay 22, 20:05 UTC15m
2026-05-22 TWB664 TPE → TAE May 22, 18:10 UTCMay 22, 18:30 UTC20m
2026-05-22 TWB663 TAE → TPE May 22, 14:05 UTCMay 22, 16:10 UTC2h 5m
2026-05-21 TWB680 KHH → ICN May 21, 12:35 UTCMay 21, 12:45 UTC10m
2026-05-21 TWB679 ICN → KHH May 21, 05:50 UTCMay 21, 06:00 UTC10m
2026-05-20 TWB030 DAD → TAE May 20, 22:25 UTCMay 20, 22:35 UTC10m
2026-05-20 TWB013 ICN → DAD May 20, 13:05 UTCMay 20, 21:10 UTC8h 5m
2026-05-20 TWB126 KLO → ICN May 20, 05:05 UTCMay 20, 08:55 UTC3h 50m
2026-05-19 TWB125 ICN → KLO May 19, 23:50 UTCMay 20, 03:20 UTC3h 30m
2026-05-18 TWB670 RMQ → ICN May 18, 09:00 UTCMay 18, 11:15 UTC2h 15m
2026-05-18 TWB669 ICN → RMQ May 18, 05:10 UTCMay 18, 07:25 UTC2h 15m
2026-05-18 TWB286 HSG → ICN May 18, 01:45 UTCMay 18, 02:50 UTC1h 5m
2026-05-17 TWB285 ICN → HSG May 17, 23:20 UTCMay 18, 00:15 UTC55m
2026-05-17 TWB670 RMQ → ICN May 17, 09:00 UTCMay 17, 11:15 UTC2h 15m
2026-05-17 TWB669 ICN → RMQ May 17, 05:05 UTCMay 17, 07:15 UTC2h 10m
2026-05-17 TWB286 HSG → ICN May 17, 01:50 UTCMay 17, 02:45 UTC55m
2026-05-16 TWB285 ICN → HSG May 16, 23:20 UTCMay 17, 00:15 UTC55m
2026-05-16 TWB354 - May 16, 04:45 UTCMay 16, 06:06 UTC1h 21m
2026-05-16 TWB353 - May 16, 02:00 UTCMay 16, 03:10 UTC1h 10m
2026-05-15 TWB670 RMQ → ICN May 15, 09:00 UTCMay 15, 11:25 UTC2h 25m
2026-05-15 TWB669 ICN → RMQ May 15, 05:10 UTCMay 15, 07:25 UTC2h 15m
2026-05-15 TWB286 HSG → ICN May 15, 01:50 UTCMay 15, 02:45 UTC55m
2026-05-14 TWB285 ICN → HSG May 14, 23:30 UTCMay 15, 00:30 UTC1h 0m
2026-05-13 TWB9606 - May 13, 03:55 UTCMay 13, 10:55 UTC7h 0m
2026-05-12 TWB244 NRT → ICN May 12, 05:45 UTCMay 12, 07:45 UTC2h 0m
2026-05-12 TWB243 ICN → NRT May 12, 02:45 UTCMay 12, 03:45 UTC1h 0m
2026-05-10 TWB264 CTS → ICN May 10, 05:40 UTCMay 10, 08:10 UTC2h 30m

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 HL8738 page for operator, model, and routing details .

Mode-S 71C738 frequently asked

What is Mode-S code 71C738?
71C738 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8738.
Where is Mode-S 71C738 registered?
Mode-S code 71C738 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 71C738 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C738, octal 34343470, decimal 7,456,568.
What flights does 71C738 operate?
Mode-S 71C738 has broadcast 20 distinct callsigns, including TWB707, TWB728, TWB670, TWB669, TWB664.