Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 21:40 UTC
Flights observed
440
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:40 UTC

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
TWB640 Tway Airlines 12 2026-07-26
TWB322 Tway Airlines 11 2026-07-26
TWB321 Tway Airlines 11 2026-07-26
TWB927 Tway Airlines 9 2026-07-25
TWB707 - 9 2026-07-04
TWB652 Tway Airlines 9 2026-07-24
TWB236 Tway Airlines 9 2026-07-26
TWB235 Tway Airlines 9 2026-07-26
TWB922 Tway Airlines 8 2026-07-23
TWB808 - 8 2026-07-15
TWB639 Tway Airlines 8 2026-07-26
TWB232 Tway Airlines 8 2026-07-26
TWB231 Tway Airlines 8 2026-07-26
TWB728 - 6 2026-07-03
TWB676 Tway Airlines 6 2026-07-23
TWB670 - 6 2026-06-22
TWB669 - 6 2026-06-22
TWB651 Tway Airlines 6 2026-07-24
TWB332 - 6 2026-07-14
TWB331 Tway Airlines 6 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB640 HKG → PUS Jul 26, 20:55 UTCJul 26, 21:30 UTC35m
2026-07-26 TWB640 HKG → PUS Jul 26, 18:10 UTCJul 26, 19:40 UTC1h 30m
2026-07-26 TWB639 PUS → HKG Jul 26, 15:55 UTCJul 26, 16:05 UTC10m
2026-07-26 TWB639 PUS → HKG Jul 26, 13:05 UTCJul 26, 15:20 UTC2h 15m
2026-07-26 TWB236 FUK → PUS Jul 26, 11:10 UTCJul 26, 11:40 UTC30m
2026-07-26 TWB235 PUS → FUK Jul 26, 09:00 UTCJul 26, 09:35 UTC35m
2026-07-26 TWB322 KIX → PUS Jul 26, 06:50 UTCJul 26, 07:50 UTC1h 0m
2026-07-26 TWB321 PUS → KIX Jul 26, 04:10 UTCJul 26, 05:15 UTC1h 5m
2026-07-26 TWB232 FUK → PUS Jul 26, 02:35 UTCJul 26, 03:00 UTC25m
2026-07-26 TWB231 PUS → FUK Jul 26, 00:45 UTCJul 26, 01:20 UTC35m
2026-07-25 TWB042 CXR → PUS Jul 25, 23:25 UTCJul 25, 23:45 UTC20m
2026-07-25 TWB041 PUS → CXR Jul 25, 13:20 UTCJul 25, 22:10 UTC8h 50m
2026-07-25 TWB927 GMP → PUS Jul 25, 10:00 UTCJul 25, 10:50 UTC50m
2026-07-25 TWB926 PUS → GMP Jul 25, 07:55 UTCJul 25, 08:45 UTC50m
2026-07-25 TWB925 GMP → PUS Jul 25, 06:05 UTCJul 25, 06:45 UTC40m
2026-07-25 TWB924 PUS → GMP Jul 25, 03:55 UTCJul 25, 04:40 UTC45m
2026-07-25 TWB923 GMP → PUS Jul 25, 02:05 UTCJul 25, 02:50 UTC45m
2026-07-25 TWB706 - Jul 25, 00:15 UTCJul 25, 01:00 UTC45m
2026-07-24 TWB703 GMP → CJU Jul 24, 22:10 UTCJul 24, 22:50 UTC40m
2026-07-24 TWB734 - Jul 24, 11:55 UTCJul 24, 12:35 UTC40m
2026-07-24 TWB733 - Jul 24, 10:00 UTCJul 24, 10:35 UTC35m
2026-07-24 TWB652 KHH → GMP Jul 24, 07:40 UTCJul 24, 08:25 UTC45m
2026-07-24 TWB652 KHH → GMP Jul 24, 05:50 UTCJul 24, 06:30 UTC40m
2026-07-24 TWB651 GMP → KHH Jul 24, 02:10 UTCJul 24, 04:40 UTC2h 30m
2026-07-23 TWB922 PUS → GMP Jul 23, 21:45 UTCJul 23, 22:30 UTC45m
2026-07-23 TWB676 KHH → PUS Jul 23, 11:55 UTCJul 23, 12:15 UTC20m
2026-07-23 TWB676 KHH → PUS Jul 23, 09:55 UTCJul 23, 10:40 UTC45m
2026-07-23 TWB675 PUS → KHH Jul 23, 06:20 UTCJul 23, 08:40 UTC2h 20m
2026-07-23 TWB270 CTS → PUS Jul 23, 02:40 UTCJul 23, 04:45 UTC2h 5m
2026-07-22 TWB269 - Jul 22, 23:25 UTCJul 23, 01:35 UTC2h 10m
2026-07-22 TWB676 KHH → PUS Jul 22, 11:50 UTCJul 22, 12:15 UTC25m
2026-07-22 TWB270 - Jul 22, 02:50 UTCJul 22, 05:05 UTC2h 15m
2026-07-21 TWB269 - Jul 21, 23:25 UTCJul 22, 01:25 UTC2h 0m
2026-07-21 TWB640 HKG → PUS Jul 21, 18:10 UTCJul 21, 21:25 UTC3h 15m
2026-07-21 TWB639 PUS → HKG Jul 21, 12:50 UTCJul 21, 15:50 UTC3h 0m
2026-07-21 TWB236 FUK → PUS Jul 21, 11:10 UTCJul 21, 11:45 UTC35m
2026-07-21 TWB235 PUS → FUK Jul 21, 09:10 UTCJul 21, 09:50 UTC40m
2026-07-21 TWB322 KIX → PUS Jul 21, 06:45 UTCJul 21, 07:50 UTC1h 5m
2026-07-21 TWB321 PUS → KIX Jul 21, 04:30 UTCJul 21, 05:30 UTC1h 0m
2026-07-21 TWB232 FUK → PUS Jul 21, 02:25 UTCJul 21, 03:05 UTC40m
2026-07-21 TWB231 PUS → FUK Jul 21, 00:15 UTCJul 21, 00:35 UTC20m
2026-07-20 TWB640 - Jul 20, 20:35 UTCJul 20, 21:20 UTC45m
2026-07-20 TWB640 - Jul 20, 17:55 UTCJul 20, 19:30 UTC1h 35m
2026-07-20 TWB639 PUS → HKG Jul 20, 13:20 UTCJul 20, 16:15 UTC2h 55m
2026-07-20 TWB236 - Jul 20, 11:15 UTCJul 20, 11:45 UTC30m
2026-07-20 TWB235 PUS → FUK Jul 20, 09:15 UTCJul 20, 10:00 UTC45m
2026-07-20 TWB322 KIX → PUS Jul 20, 06:55 UTCJul 20, 08:15 UTC1h 20m
2026-07-20 TWB321 PUS → KIX Jul 20, 04:05 UTCJul 20, 05:15 UTC1h 10m
2026-07-20 TWB232 FUK → PUS Jul 20, 02:20 UTCJul 20, 03:00 UTC40m
2026-07-20 TWB231 PUS → FUK Jul 20, 00:35 UTCJul 20, 00:55 UTC20m

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 Jul 26, 21:40 UTC.
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 TWB640, TWB322, TWB321, TWB927, TWB707.