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
Broadcasting now · callsign TWB907 · 11,900 ft
Flights observed
361
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 13:05 UTC

Current position

71C327 is currently broadcasting. Map zoomed to live position.

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 Tway Airlines 19 2026-07-19
TWB125 Tway Airlines 18 2026-07-18
TWB669 - 14 2026-07-10
TWB670 - 12 2026-07-10
TWB643 Tway Airlines 10 2026-07-18
TWB286 - 9 2026-07-10
TWB285 - 9 2026-07-09
TWB644 - 8 2026-07-18
TWB675 Tway Airlines 6 2026-07-20
TWB616 Tway Airlines 6 2026-06-28
TWB615 Tway Airlines 6 2026-06-28
TWB328 Tway Airlines 6 2026-04-20
TWB214 Tway Airlines 6 2026-07-21
TWB663 - 5 2026-07-04
TWB313 Tway Airlines 5 2026-07-21
TWB306 Tway Airlines 5 2026-07-21
TWB288 Tway Airlines 5 2026-07-25
TWB287 Tway Airlines 5 2026-07-24
TWB013 - 5 2026-06-26
TWB9635 Tway Airlines 4 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TWB208 FUK → ICN Jul 26, 12:00 UTCJul 26, 13:00 UTC1h 0m
2026-07-26 TWB207 ICN → FUK Jul 26, 09:30 UTCJul 26, 10:15 UTC45m
2026-07-26 TWB244 NRT → ICN Jul 26, 05:55 UTCJul 26, 08:00 UTC2h 6m
2026-07-26 TWB243 ICN → NRT Jul 26, 01:45 UTCJul 26, 03:35 UTC1h 50m
2026-07-25 TWB9635 ICN → HLD Jul 25, 12:05 UTCJul 25, 18:20 UTC6h 15m
2026-07-25 TWB9617 ICN → ICN Jul 25, 05:15 UTCJul 25, 10:10 UTC4h 55m
2026-07-25 TWB288 KMJ → ICN Jul 25, 01:45 UTCJul 25, 02:50 UTC1h 5m
2026-07-24 TWB287 ICN → KMJ Jul 24, 23:05 UTCJul 25, 00:00 UTC55m
2026-07-23 TWB672 KHH → ICN Jul 23, 08:10 UTCJul 23, 10:40 UTC2h 30m
2026-07-23 TWB671 ICN → KHH Jul 23, 04:35 UTCJul 23, 07:05 UTC2h 30m
2026-07-22 TWB246 NRT → ICN Jul 22, 11:10 UTCJul 22, 12:55 UTC1h 45m
2026-07-22 TWB202 NRT → TAE Jul 22, 04:25 UTCJul 22, 05:25 UTC1h 0m
2026-07-22 TWB201 ICN → FUK Jul 22, 02:20 UTCJul 22, 03:15 UTC55m
2026-07-21 TWB306 KIX → ICN Jul 21, 10:55 UTCJul 21, 12:20 UTC1h 25m
2026-07-21 TWB313 TAE → KIX Jul 21, 07:55 UTCJul 21, 09:05 UTC1h 10m
2026-07-21 TWB214 FUK → TAE Jul 21, 05:55 UTCJul 21, 06:15 UTC20m
2026-07-21 TWB227 CJU → FUK Jul 21, 04:10 UTCJul 21, 04:40 UTC30m
2026-07-21 TWB709 GMP → CJU Jul 21, 01:35 UTCJul 21, 02:10 UTC35m
2026-07-20 TWB922 PUS → GMP Jul 20, 23:35 UTCJul 21, 00:20 UTC45m
2026-07-20 TWB676 KHH → PUS Jul 20, 12:00 UTCJul 20, 12:20 UTC20m
2026-07-20 TWB676 KHH → PUS Jul 20, 10:10 UTCJul 20, 10:55 UTC45m
2026-07-20 TWB675 PUS → KHH Jul 20, 06:45 UTCJul 20, 09:00 UTC2h 15m
2026-07-20 TWB3001 ICN → PUS Jul 20, 04:55 UTCJul 20, 05:40 UTC45m
2026-07-19 TWB126 KLO → ICN Jul 19, 05:15 UTCJul 19, 08:55 UTC3h 40m
2026-07-18 TWB125 ICN → KLO Jul 18, 23:55 UTCJul 19, 03:35 UTC3h 40m
2026-07-18 TWB034 CXR → ICN Jul 18, 10:55 UTCJul 18, 21:40 UTC10h 45m
2026-07-18 TWB644 - Jul 18, 08:10 UTCJul 18, 08:55 UTC45m
2026-07-18 TWB644 - Jul 18, 05:30 UTCJul 18, 06:55 UTC1h 25m
2026-07-18 TWB643 ICN → HKG Jul 18, 00:25 UTCJul 18, 03:20 UTC2h 56m
2026-07-17 TWB208 - Jul 17, 11:45 UTCJul 17, 13:10 UTC1h 25m
2026-07-17 TWB207 - Jul 17, 09:20 UTCJul 17, 10:10 UTC50m
2026-07-17 TWB3030 - Jul 17, 03:10 UTCJul 17, 06:00 UTC2h 50m
2026-07-15 TWB029 - Jul 15, 12:55 UTCJul 15, 15:35 UTC2h 40m
2026-07-15 TWB214 - Jul 15, 05:55 UTCJul 15, 06:25 UTC30m
2026-07-14 TWB213 - Jul 14, 23:30 UTCJul 14, 23:55 UTC25m
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

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?
Yes. Mode-S 71C327 is currently airborne.
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.