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 1h ago
Flights observed
349
Distinct callsigns
20
Country
KR
Last broadcast
1h 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 - 9 2026-07-04
TWB927 - 8 2026-07-13
TWB322 - 8 2026-07-09
TWB321 - 8 2026-07-09
TWB808 - 7 2026-07-11
TWB652 - 7 2026-07-08
TWB922 - 6 2026-07-07
TWB728 - 6 2026-07-03
TWB670 - 6 2026-06-22
TWB669 - 6 2026-06-22
TWB236 - 6 2026-07-09
TWB235 - 6 2026-07-09
TWB736 - 5 2026-07-03
TWB735 - 5 2026-07-03
TWB688 - 5 2026-07-12
TWB687 - 5 2026-07-12
TWB664 - 5 2026-06-24
TWB651 - 5 2026-07-08
TWB332 - 5 2026-07-10
TWB319 - 5 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB319 PUS → KIX Jul 14, 00:30 UTCJul 14, 01:35 UTC1h 5m
2026-07-13 TWB640 - Jul 13, 20:55 UTCJul 13, 21:30 UTC35m
2026-07-13 TWB640 - Jul 13, 18:25 UTCJul 13, 19:55 UTC1h 30m
2026-07-13 TWB639 PUS → HKG Jul 13, 13:20 UTCJul 13, 16:15 UTC2h 55m
2026-07-13 TWB927 GMP → PUS Jul 13, 10:10 UTCJul 13, 10:50 UTC40m
2026-07-13 TWB668 TSA → GMP Jul 13, 06:15 UTCJul 13, 08:20 UTC2h 5m
2026-07-13 TWB667 GMP → TSA Jul 13, 02:45 UTCJul 13, 05:05 UTC2h 20m
2026-07-13 TWB706 - Jul 13, 00:20 UTCJul 13, 01:05 UTC45m
2026-07-12 TWB703 - Jul 12, 22:10 UTCJul 12, 22:50 UTC40m
2026-07-12 TWB734 - Jul 12, 12:20 UTCJul 12, 12:55 UTC35m
2026-07-12 TWB688 - Jul 12, 09:05 UTCJul 12, 09:35 UTC30m
2026-07-12 TWB687 - Jul 12, 06:45 UTCJul 12, 07:20 UTC35m
2026-07-12 TWB809 - Jul 12, 03:01 UTCJul 12, 03:20 UTC20m
2026-07-11 TWB801 - Jul 11, 22:40 UTCJul 11, 22:55 UTC15m
2026-07-11 TWB801 - Jul 11, 21:25 UTCJul 11, 21:40 UTC15m
2026-07-11 TWB808 - Jul 11, 11:00 UTCJul 11, 11:15 UTC15m
2026-07-11 TWB907 - Jul 11, 07:45 UTCJul 11, 08:05 UTC20m
2026-07-11 TWB906 - Jul 11, 06:30 UTCJul 11, 06:45 UTC15m
2026-07-11 TWB715 - Jul 11, 04:15 UTCJul 11, 04:50 UTC35m
2026-07-11 TWB710 - Jul 11, 02:00 UTCJul 11, 02:40 UTC40m
2026-07-10 TWB805 - Jul 10, 23:50 UTCJul 11, 00:05 UTC15m
2026-07-10 TWB810 - Jul 10, 10:35 UTCJul 10, 11:00 UTC25m
2026-07-10 TWB727 - Jul 10, 08:25 UTCJul 10, 09:00 UTC35m
2026-07-10 TWB722 - Jul 10, 06:35 UTCJul 10, 07:15 UTC40m
2026-07-10 TWB332 - Jul 10, 03:20 UTCJul 10, 04:15 UTC55m
2026-07-10 TWB319 PUS → KIX Jul 10, 00:30 UTCJul 10, 01:35 UTC1h 5m
2026-07-09 TWB236 - Jul 9, 11:15 UTCJul 9, 12:05 UTC50m
2026-07-09 TWB235 - Jul 9, 09:10 UTCJul 9, 09:30 UTC20m
2026-07-09 TWB322 KIX → PUS Jul 9, 06:50 UTCJul 9, 07:55 UTC1h 5m
2026-07-09 TWB321 PUS → KIX Jul 9, 04:05 UTCJul 9, 05:25 UTC1h 20m
2026-07-09 TWB232 - Jul 9, 02:10 UTCJul 9, 02:50 UTC40m
2026-07-09 TWB231 - Jul 9, 00:20 UTCJul 9, 00:40 UTC20m
2026-07-08 TWB927 GMP → PUS Jul 8, 10:10 UTCJul 8, 10:55 UTC45m
2026-07-08 TWB652 - Jul 8, 08:00 UTCJul 8, 08:40 UTC40m
2026-07-08 TWB652 - Jul 8, 06:05 UTCJul 8, 06:55 UTC50m
2026-07-08 TWB651 GMP → KHH Jul 8, 02:05 UTCJul 8, 04:50 UTC2h 45m
2026-07-07 TWB922 PUS → GMP Jul 7, 21:50 UTCJul 7, 22:40 UTC50m
2026-07-07 TWB236 - Jul 7, 11:10 UTCJul 7, 11:45 UTC35m
2026-07-07 TWB235 - Jul 7, 09:00 UTCJul 7, 09:20 UTC20m
2026-07-07 TWB322 KIX → PUS Jul 7, 06:40 UTCJul 7, 07:50 UTC1h 10m
2026-07-07 TWB321 PUS → KIX Jul 7, 04:05 UTCJul 7, 05:10 UTC1h 5m
2026-07-07 TWB232 - Jul 7, 02:00 UTCJul 7, 02:35 UTC35m
2026-07-07 TWB231 - Jul 7, 00:10 UTCJul 7, 00:25 UTC15m
2026-07-06 TWB927 GMP → PUS Jul 6, 10:10 UTCJul 6, 10:50 UTC40m
2026-07-06 TWB652 KHH → GMP Jul 6, 06:00 UTCJul 6, 08:35 UTC2h 35m
2026-07-06 TWB651 GMP → KHH Jul 6, 02:00 UTCJul 6, 04:30 UTC2h 30m
2026-07-05 TWB922 PUS → GMP Jul 5, 21:45 UTCJul 5, 22:30 UTC45m
2026-07-05 TWB927 GMP → PUS Jul 5, 10:15 UTCJul 5, 10:55 UTC40m
2026-07-05 TWB652 KHH → GMP Jul 5, 06:00 UTCJul 5, 08:30 UTC2h 30m
2026-07-05 TWB651 GMP → KHH Jul 5, 02:15 UTCJul 5, 04:45 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 1h 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, TWB927, TWB322, TWB321, TWB808.