Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C327

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

Currently assigned to HL8327 · BOEING 737-800

Hex
71C327
Octal
34341447
Decimal
7,455,527
Country
KR
Tail
HL8327
Type
B738
No current signal · last broadcast 8h ago
Flights observed
326
Distinct callsigns
20
Country
KR
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 71C327.

Country allocation

The ICAO 24-bit address 71C327 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 - 18 2026-07-09
TWB125 - 17 2026-07-09
TWB669 - 14 2026-07-10
TWB670 - 12 2026-07-10
TWB643 - 9 2026-06-30
TWB286 - 9 2026-07-10
TWB285 - 9 2026-07-09
TWB644 - 6 2026-06-30
TWB616 Tway Airlines 6 2026-06-28
TWB615 Tway Airlines 6 2026-06-28
TWB328 Tway Airlines 6 2026-04-20
TWB675 Tway Airlines 5 2026-05-25
TWB663 - 5 2026-07-04
TWB013 - 5 2026-06-26
TWB664 - 4 2026-07-04
TWB327 Tway Airlines 4 2026-04-20
TWB313 - 4 2026-07-06
TWB306 - 4 2026-07-06
TWB288 - 4 2026-07-08
TWB287 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB314 - Jul 14, 10:45 UTCJul 14, 11:50 UTC1h 5m
2026-07-14 TWB305 ICN → KIX Jul 14, 07:10 UTCJul 14, 08:25 UTC1h 15m
2026-07-12 TWB034 - Jul 12, 10:30 UTCJul 12, 21:30 UTC11h 0m
2026-07-11 TWB9636 - Jul 11, 17:45 UTCJul 11, 18:10 UTC25m
2026-07-11 TWB9635 - Jul 11, 11:50 UTCJul 11, 17:10 UTC5h 20m
2026-07-11 TWB9618 - Jul 11, 09:35 UTCJul 11, 10:00 UTC25m
2026-07-11 TWB9617 - Jul 11, 05:01 UTCJul 11, 05:15 UTC15m
2026-07-10 TWB670 - Jul 10, 09:00 UTCJul 10, 11:10 UTC2h 10m
2026-07-10 TWB669 - Jul 10, 05:25 UTCJul 10, 07:30 UTC2h 5m
2026-07-10 TWB286 - Jul 10, 01:45 UTCJul 10, 03:00 UTC1h 15m
2026-07-09 TWB285 - Jul 9, 23:25 UTCJul 10, 00:25 UTC1h 0m
2026-07-09 TWB607 ICN → ICN Jul 9, 10:45 UTCJul 9, 14:30 UTC3h 45m
2026-07-09 TWB126 - Jul 9, 05:30 UTCJul 9, 09:20 UTC3h 50m
2026-07-09 TWB125 - Jul 9, 00:00 UTCJul 9, 03:35 UTC3h 35m
2026-07-08 TWB9636 - Jul 8, 17:50 UTCJul 8, 18:10 UTC20m
2026-07-08 TWB9635 - Jul 8, 12:00 UTCJul 8, 17:10 UTC5h 10m
2026-07-08 TWB606 - Jul 8, 08:30 UTCJul 8, 08:50 UTC20m
2026-07-08 TWB605 - Jul 8, 04:50 UTCJul 8, 05:15 UTC25m
2026-07-08 TWB288 - Jul 8, 01:40 UTCJul 8, 02:50 UTC1h 10m
2026-07-07 TWB287 - Jul 7, 23:15 UTCJul 8, 00:20 UTC1h 5m
2026-07-07 TWB9618 - Jul 7, 11:25 UTCJul 7, 11:50 UTC25m
2026-07-07 TWB9617 - Jul 7, 05:10 UTCJul 7, 05:35 UTC25m
2026-07-07 TWB288 KMJ → ICN Jul 7, 01:25 UTCJul 7, 02:35 UTC1h 10m
2026-07-06 TWB287 - Jul 6, 23:00 UTCJul 7, 00:00 UTC1h 0m
2026-07-06 TWB306 - Jul 6, 10:50 UTCJul 6, 12:15 UTC1h 25m
2026-07-06 TWB313 - Jul 6, 08:10 UTCJul 6, 08:50 UTC40m
2026-07-06 TWB214 - Jul 6, 05:55 UTCJul 6, 06:25 UTC30m
2026-07-05 TWB213 TAE → FUK Jul 5, 23:10 UTCJul 5, 23:45 UTC35m
2026-07-05 TWB808 - Jul 5, 10:10 UTCJul 5, 10:30 UTC20m
2026-07-05 TWB945 - Jul 5, 07:45 UTCJul 5, 07:55 UTC10m
2026-07-05 TWB946 - Jul 5, 06:40 UTCJul 5, 06:50 UTC10m
2026-07-05 TWB785 - Jul 5, 04:15 UTCJul 5, 04:50 UTC35m
2026-07-05 TWB786 - Jul 5, 02:00 UTCJul 5, 02:40 UTC40m
2026-07-05 TWB805 - Jul 5, 00:05 UTCJul 5, 00:20 UTC15m
2026-07-04 TWB664 - Jul 4, 18:10 UTCJul 4, 19:55 UTC1h 45m
2026-07-04 TWB663 - Jul 4, 14:10 UTCJul 4, 16:10 UTC2h 0m
2026-07-04 TWB314 - Jul 4, 11:30 UTCJul 4, 12:00 UTC30m
2026-07-04 TWB305 ICN → KIX Jul 4, 08:45 UTCJul 4, 10:05 UTC1h 20m
2026-07-04 TWB242 NRT → ICN Jul 4, 03:30 UTCJul 4, 05:35 UTC2h 5m
2026-07-03 TWB241 ICN → NRT Jul 3, 23:55 UTCJul 4, 01:45 UTC1h 50m
2026-07-02 TWB606 - Jul 2, 08:50 UTCJul 2, 09:20 UTC30m
2026-07-02 TWB605 - Jul 2, 05:10 UTCJul 2, 05:25 UTC15m
2026-06-30 TWB644 HKG → ICN Jun 30, 05:35 UTCJun 30, 08:50 UTC3h 15m
2026-06-30 TWB643 - Jun 30, 02:50 UTCJun 30, 03:05 UTC15m
2026-06-30 TWB643 - Jun 30, 00:00 UTCJun 30, 02:15 UTC2h 16m
2026-06-29 TWB670 - Jun 29, 09:10 UTCJun 29, 11:10 UTC2h 0m
2026-06-29 TWB669 - Jun 29, 05:15 UTCJun 29, 07:30 UTC2h 15m
2026-06-29 TWB286 - Jun 29, 01:44 UTCJun 29, 02:39 UTC55m
2026-06-28 TWB285 ICN → HSG Jun 28, 23:20 UTCJun 29, 00:14 UTC55m
2026-06-28 TWB616 WUH → ICN Jun 28, 18:59 UTCJun 28, 19:20 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 HL8327 page for operator, model, and routing details .

Mode-S 71C327 frequently asked

What is Mode-S code 71C327?
71C327 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8327.
Where is Mode-S 71C327 registered?
Mode-S code 71C327 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 71C327 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C327, octal 34341447, decimal 7,455,527.
What flights does 71C327 operate?
Mode-S 71C327 has broadcast 20 distinct callsigns, including TWB126, TWB125, TWB669, TWB670, TWB643.