Apparatus

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sensors Mode-S transponder

71C355

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

Currently assigned to HL8355 · BOEING 737-800

Hex
71C355
Octal
34341525
Decimal
7,455,573
Country
KR
Tail
HL8355
Type
B738
No current signal · last broadcast 2h ago
Flights observed
141
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C355.

Country allocation

The ICAO 24-bit address 71C355 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
AIH918 - 19 2026-05-29
AIH917 Alpine Air Chile 17 2026-05-29
AIH971 - 9 2026-04-29
AIH919 - 9 2026-06-02
AIH920 - 8 2026-06-02
AIH925 - 7 2026-06-01
AIH926 - 6 2026-06-01
AIH972 Alpine Air Chile 5 2026-04-29
AIH374 Alpine Air Chile 5 2026-05-30
AIH973 - 4 2026-04-21
AIH948 - 4 2026-05-20
AIH928 - 4 2026-05-28
AIH927 - 4 2026-05-28
AIH192 Alpine Air Chile 4 2026-05-31
AIH191 Alpine Air Chile 4 2026-05-31
AIH182 - 4 2026-05-30
AIH181 Alpine Air Chile 4 2026-05-30
AIH974 Alpine Air Chile 3 2026-04-21
AIH947 - 3 2026-05-31
AIH373 - 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 AIH920 - Jun 2, 23:10 UTCJun 2, 23:40 UTC30m
2026-06-02 AIH919 - Jun 2, 14:35 UTCJun 2, 14:55 UTC20m
2026-06-02 AIH978 - Jun 2, 11:55 UTCJun 2, 12:20 UTC25m
2026-06-02 AIH977 - Jun 2, 08:05 UTCJun 2, 08:20 UTC15m
2026-06-01 AIH376 - Jun 1, 19:55 UTCJun 1, 23:35 UTC3h 40m
2026-06-01 AIH375 - Jun 1, 14:15 UTCJun 1, 18:00 UTC3h 45m
2026-06-01 AIH926 - Jun 1, 05:40 UTCJun 1, 06:10 UTC30m
2026-06-01 AIH925 - Jun 1, 02:45 UTCJun 1, 03:00 UTC15m
2026-05-31 AIH947 ICN → ICN May 31, 16:00 UTCMay 31, 20:35 UTC4h 35m
2026-05-31 AIH191 KIX → ICN May 31, 10:55 UTCMay 31, 12:20 UTC1h 25m
2026-05-31 AIH192 ICN → KIX May 31, 08:25 UTCMay 31, 09:35 UTC1h 10m
2026-05-30 AIH374 HAN → ICN May 30, 19:50 UTCMay 30, 23:50 UTC4h 0m
2026-05-30 AIH373 - May 30, 14:10 UTCMay 30, 17:55 UTC3h 45m
2026-05-30 AIH181 KIX → ICN May 30, 10:30 UTCMay 30, 12:05 UTC1h 35m
2026-05-30 AIH182 ICN → KIX May 30, 07:55 UTCMay 30, 09:15 UTC1h 20m
2026-05-30 AIH926 - May 30, 05:55 UTCMay 30, 06:15 UTC20m
2026-05-30 AIH925 - May 30, 02:40 UTCMay 30, 03:05 UTC25m
2026-05-29 AIH920 - May 29, 22:30 UTCMay 29, 22:50 UTC20m
2026-05-29 AIH919 - May 29, 14:35 UTCMay 29, 16:10 UTC1h 35m
2026-05-29 AIH918 - May 29, 10:35 UTCMay 29, 11:25 UTC50m
2026-05-29 AIH917 BFS → AGP May 29, 04:20 UTCMay 29, 04:35 UTC15m
2026-05-28 AIH374 HAN → ICN May 28, 19:50 UTCMay 28, 23:40 UTC3h 50m
2026-05-28 AIH373 - May 28, 14:15 UTCMay 28, 18:00 UTC3h 45m
2026-05-28 AIH181 KIX → ICN May 28, 10:40 UTCMay 28, 12:05 UTC1h 25m
2026-05-28 AIH182 ICN → KIX May 28, 07:55 UTCMay 28, 09:20 UTC1h 25m
2026-05-28 AIH928 - May 28, 05:20 UTCMay 28, 05:45 UTC25m
2026-05-28 AIH927 - May 28, 02:00 UTCMay 28, 02:15 UTC15m
2026-05-27 AIH372 HAN → ICN May 27, 19:55 UTCMay 27, 23:45 UTC3h 50m
2026-05-27 AIH371 - May 27, 14:10 UTCMay 27, 14:35 UTC25m
2026-05-27 AIH918 - May 27, 10:55 UTCMay 27, 11:25 UTC30m
2026-05-27 AIH917 BFS → AGP May 27, 03:59 UTCMay 27, 04:30 UTC30m
2026-05-26 AIH374 HAN → ICN May 26, 14:20 UTCMay 26, 23:49 UTC9h 30m
2026-05-26 AIH181 KIX → ICN May 26, 11:05 UTCMay 26, 12:35 UTC1h 30m
2026-05-26 AIH182 ICN → KIX May 26, 08:15 UTCMay 26, 09:40 UTC1h 25m
2026-05-26 AIH928 - May 26, 06:34 UTCMay 26, 06:59 UTC25m
2026-05-26 AIH927 - May 26, 03:19 UTCMay 26, 03:40 UTC20m
2026-05-23 AIH374 HAN → ICN May 23, 14:15 UTCMay 24, 00:05 UTC9h 51m
2026-05-22 AIH920 - May 22, 22:15 UTCMay 22, 22:40 UTC25m
2026-05-22 AIH919 - May 22, 14:40 UTCMay 22, 15:00 UTC20m
2026-05-22 AIH918 - May 22, 10:50 UTCMay 22, 11:20 UTC29m
2026-05-22 AIH917 BFS → AGP May 22, 04:15 UTCMay 22, 04:30 UTC15m
2026-05-21 AIH920 - May 21, 22:25 UTCMay 21, 22:50 UTC25m
2026-05-21 AIH919 - May 21, 14:35 UTCMay 21, 21:35 UTC7h 0m
2026-05-21 AIH928 - May 21, 05:00 UTCMay 21, 05:20 UTC20m
2026-05-21 AIH927 - May 21, 02:05 UTCMay 21, 02:25 UTC20m
2026-05-20 AIH948 ICN → ICN May 20, 16:00 UTCMay 20, 20:40 UTC4h 40m
2026-05-20 AIH191 KIX → ICN May 20, 11:45 UTCMay 20, 13:15 UTC1h 30m
2026-05-20 AIH192 ICN → KIX May 20, 08:05 UTCMay 20, 09:30 UTC1h 25m
2026-05-20 AIH926 - May 20, 05:50 UTCMay 20, 06:15 UTC25m
2026-05-20 AIH925 - May 20, 02:35 UTCMay 20, 03:15 UTC40m

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 HL8355 page for operator, model, and routing details .

Mode-S 71C355 frequently asked

What is Mode-S code 71C355?
71C355 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8355.
Where is Mode-S 71C355 registered?
Mode-S code 71C355 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 71C355 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C355, octal 34341525, decimal 7,455,573.
What flights does 71C355 operate?
Mode-S 71C355 has broadcast 20 distinct callsigns, including AIH918, AIH917, AIH971, AIH919, AIH920.