Apparatus

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sensors Mode-S transponder

71C220

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

Currently assigned to HL8220 · BOEING 737-800

Hex
71C220
Octal
34341040
Decimal
7,455,264
Country
KR
Tail
HL8220
Type
B738
No current signal · last broadcast 6h ago
Flights observed
335
Distinct callsigns
20
Country
KR
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 71C220.

Country allocation

The ICAO 24-bit address 71C220 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
TWB676 - 14 2026-07-13
TWB671 - 14 2026-06-26
TWB672 - 13 2026-06-26
TWB264 Tway Airlines 13 2026-06-13
TWB263 - 13 2026-06-13
TWB287 Tway Airlines 10 2026-06-13
TWB288 - 9 2026-06-14
TWB675 - 7 2026-07-13
TWB670 - 6 2026-06-18
TWB669 - 6 2026-06-18
TWB664 - 6 2026-06-27
TWB663 - 6 2026-06-27
TWB252 - 6 2026-06-23
TWB314 - 5 2026-06-27
TWB270 - 5 2026-07-13
TWB269 - 5 2026-07-12
TWB251 - 5 2026-06-23
TWB908 Tway Airlines 4 2026-05-04
TWB901 Tway Airlines 4 2026-05-04
TWB718 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TWB927 GMP → PUS Jul 14, 10:15 UTCJul 14, 10:55 UTC40m
2026-07-14 TWB926 PUS → GMP Jul 14, 08:05 UTCJul 14, 08:50 UTC45m
2026-07-14 TWB925 GMP → PUS Jul 14, 06:15 UTCJul 14, 07:00 UTC45m
2026-07-14 TWB924 PUS → GMP Jul 14, 04:30 UTCJul 14, 05:15 UTC45m
2026-07-14 TWB232 - Jul 14, 02:05 UTCJul 14, 02:40 UTC35m
2026-07-14 TWB231 - Jul 14, 00:20 UTCJul 14, 00:40 UTC20m
2026-07-13 TWB676 - Jul 13, 11:55 UTCJul 13, 12:15 UTC20m
2026-07-13 TWB676 - Jul 13, 10:05 UTCJul 13, 10:55 UTC50m
2026-07-13 TWB675 PUS → KHH Jul 13, 06:20 UTCJul 13, 08:40 UTC2h 20m
2026-07-13 TWB270 - Jul 13, 02:35 UTCJul 13, 04:40 UTC2h 5m
2026-07-12 TWB269 - Jul 12, 23:15 UTCJul 13, 01:20 UTC2h 5m
2026-07-12 TWB236 - Jul 12, 11:10 UTCJul 12, 11:40 UTC30m
2026-07-12 TWB235 - Jul 12, 09:00 UTCJul 12, 09:30 UTC30m
2026-07-12 TWB322 - Jul 12, 06:55 UTCJul 12, 08:01 UTC1h 5m
2026-07-12 TWB321 PUS → KIX Jul 12, 04:01 UTCJul 12, 05:05 UTC1h 5m
2026-07-12 TWB232 - Jul 12, 02:10 UTCJul 12, 02:45 UTC35m
2026-07-12 TWB231 - Jul 12, 00:15 UTCJul 12, 00:30 UTC15m
2026-07-11 TWB236 - Jul 11, 11:10 UTCJul 11, 11:45 UTC35m
2026-07-11 TWB235 - Jul 11, 08:55 UTCJul 11, 09:15 UTC20m
2026-07-11 TWB322 KIX → PUS Jul 11, 06:35 UTCJul 11, 07:40 UTC1h 5m
2026-07-11 TWB321 PUS → KIX Jul 11, 04:01 UTCJul 11, 05:10 UTC1h 10m
2026-07-10 TWB676 KHH → PUS Jul 10, 09:45 UTCJul 10, 11:55 UTC2h 10m
2026-07-10 TWB675 PUS → KHH Jul 10, 06:10 UTCJul 10, 08:25 UTC2h 15m
2026-07-10 TWB270 - Jul 10, 02:45 UTCJul 10, 05:00 UTC2h 15m
2026-07-09 TWB269 - Jul 9, 23:25 UTCJul 10, 01:30 UTC2h 5m
2026-07-09 TWB320 KIX → PUS Jul 9, 10:15 UTCJul 9, 11:35 UTC1h 20m
2026-07-09 TWB331 - Jul 9, 07:55 UTCJul 9, 09:00 UTC1h 5m
2026-07-09 TWB717 - Jul 9, 05:20 UTCJul 9, 05:55 UTC35m
2026-07-08 TWB722 - Jul 8, 06:45 UTCJul 8, 07:25 UTC40m
2026-07-08 TWB332 - Jul 8, 03:10 UTCJul 8, 04:05 UTC55m
2026-07-08 TWB319 PUS → KIX Jul 8, 00:50 UTCJul 8, 01:50 UTC1h 0m
2026-07-07 TWB676 - Jul 7, 11:45 UTCJul 7, 12:10 UTC25m
2026-07-07 TWB676 - Jul 7, 09:55 UTCJul 7, 10:45 UTC50m
2026-07-07 TWB675 PUS → KHH Jul 7, 06:15 UTCJul 7, 08:40 UTC2h 25m
2026-07-06 TWB676 - Jul 6, 11:35 UTCJul 6, 11:55 UTC20m
2026-07-06 TWB676 - Jul 6, 09:45 UTCJul 6, 10:35 UTC50m
2026-07-06 TWB675 PUS → KHH Jul 6, 06:05 UTCJul 6, 08:25 UTC2h 20m
2026-07-06 TWB270 - Jul 6, 02:30 UTCJul 6, 04:45 UTC2h 15m
2026-07-05 TWB269 - Jul 5, 23:15 UTCJul 6, 01:25 UTC2h 10m
2026-07-05 TWB676 - Jul 5, 11:45 UTCJul 5, 12:00 UTC15m
2026-07-05 TWB676 - Jul 5, 09:55 UTCJul 5, 10:40 UTC45m
2026-07-05 TWB675 PUS → KHH Jul 5, 06:00 UTCJul 5, 08:25 UTC2h 25m
2026-07-05 TWB270 - Jul 5, 02:25 UTCJul 5, 04:40 UTC2h 15m
2026-07-04 TWB269 PUS → CTS Jul 4, 23:05 UTCJul 5, 01:00 UTC1h 55m
2026-07-04 TWB676 - Jul 4, 11:35 UTCJul 4, 12:00 UTC25m
2026-07-04 TWB676 - Jul 4, 09:50 UTCJul 4, 10:30 UTC40m
2026-07-04 TWB675 PUS → KHH Jul 4, 06:00 UTCJul 4, 08:25 UTC2h 25m
2026-07-03 TWB676 - Jul 3, 11:45 UTCJul 3, 12:10 UTC25m
2026-07-03 TWB676 - Jul 3, 09:55 UTCJul 3, 10:45 UTC50m
2026-07-03 TWB675 PUS → KHH Jul 3, 06:30 UTCJul 3, 08:50 UTC2h 20m

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 HL8220 page for operator, model, and routing details .

Mode-S 71C220 frequently asked

What is Mode-S code 71C220?
71C220 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8220.
Where is Mode-S 71C220 registered?
Mode-S code 71C220 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 71C220 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C220, octal 34341040, decimal 7,455,264.
What flights does 71C220 operate?
Mode-S 71C220 has broadcast 20 distinct callsigns, including TWB676, TWB671, TWB672, TWB264, TWB263.