Apparatus

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sensors Mode-S transponder

71C375

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

Currently assigned to HL8375 · BOEING 737-800

Hex
71C375
Octal
34341565
Decimal
7,455,605
Country
KR
Tail
HL8375
Type
B738
Broadcasting now · callsign ESR649 · 11,550 ft
Flights observed
375
Distinct callsigns
20
Country
KR
Last broadcast
13h ago

Current position

71C375 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C375 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
ESR646 Eastar Jet 21 2026-07-26
ESR645 Eastar Jet 20 2026-07-26
ESR872 - 18 2026-07-18
ESR611 Eastar Jet 17 2026-07-23
ESR604 Eastar Jet 17 2026-07-23
ESR650 Eastar Jet 16 2026-07-21
ESR649 Eastar Jet 16 2026-07-21
ESR612 Eastar Jet 16 2026-07-23
ESR603 Eastar Jet 16 2026-07-23
ESR607 Eastar Jet 14 2026-06-07
ESR606 Eastar Jet 14 2026-07-24
ESR605 Eastar Jet 14 2026-07-23
ESR608 Eastar Jet 13 2026-06-07
ESR626 - 8 2026-07-08
ESR881 - 7 2026-07-05
ESR871 - 7 2026-07-23
ESR854 - 7 2026-07-05
ESR853 - 7 2026-07-05
ESR648 Eastar Jet 7 2026-07-21
ESR647 Eastar Jet 7 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR561 ICN → CXR Jul 26, 13:20 UTCJul 26, 21:15 UTC7h 55m
2026-07-26 ESR624 CTS → ICN Jul 26, 09:00 UTCJul 26, 11:30 UTC2h 30m
2026-07-26 ESR623 ICN → CTS Jul 26, 05:30 UTCJul 26, 07:40 UTC2h 11m
2026-07-26 ESR646 FUK → ICN Jul 26, 03:00 UTCJul 26, 04:00 UTC1h 0m
2026-07-26 ESR645 ICN → FUK Jul 26, 01:00 UTCJul 26, 01:55 UTC55m
2026-07-25 ESR594 DAD → ICN Jul 25, 13:25 UTCJul 25, 23:40 UTC10h 15m
2026-07-25 ESR624 CTS → ICN Jul 25, 09:15 UTCJul 25, 11:45 UTC2h 30m
2026-07-25 ESR623 ICN → CTS Jul 25, 05:30 UTCJul 25, 07:55 UTC2h 25m
2026-07-25 ESR818 YNT → ICN Jul 25, 03:40 UTCJul 25, 04:05 UTC25m
2026-07-25 ESR817 ICN → YNT Jul 25, 00:30 UTCJul 25, 00:50 UTC20m
2026-07-24 ESR862 HKG → ICN Jul 24, 16:50 UTCJul 24, 20:00 UTC3h 10m
2026-07-24 ESR861 ICN → HKG Jul 24, 15:05 UTCJul 24, 15:20 UTC15m
2026-07-24 ESR861 ICN → HKG Jul 24, 12:20 UTCJul 24, 14:35 UTC2h 15m
2026-07-24 ESR820 YNT → ICN Jul 24, 10:05 UTCJul 24, 10:35 UTC30m
2026-07-24 ESR819 ICN → YNT Jul 24, 07:05 UTCJul 24, 07:20 UTC15m
2026-07-24 ESR606 NRT → ICN Jul 24, 02:35 UTCJul 24, 04:25 UTC1h 50m
2026-07-23 ESR605 ICN → NRT Jul 23, 22:40 UTCJul 24, 00:50 UTC2h 10m
2026-07-23 ESR871 ICN → ICN Jul 23, 14:30 UTCJul 23, 18:55 UTC4h 25m
2026-07-23 ESR604 NRT → ICN Jul 23, 11:05 UTCJul 23, 13:05 UTC2h 0m
2026-07-23 ESR603 ICN → NRT Jul 23, 07:15 UTCJul 23, 09:15 UTC2h 0m
2026-07-23 ESR612 KIX → ICN Jul 23, 03:25 UTCJul 23, 04:50 UTC1h 25m
2026-07-23 ESR611 ICN → KIX Jul 23, 00:45 UTCJul 23, 02:05 UTC1h 20m
2026-07-22 ESR582 PQC → ICN Jul 22, 11:40 UTCJul 22, 23:20 UTC11h 40m
2026-07-22 ESR606 NRT → ICN Jul 22, 02:40 UTCJul 22, 04:40 UTC2h 0m
2026-07-21 ESR605 ICN → NRT Jul 21, 22:45 UTCJul 22, 00:35 UTC1h 50m
2026-07-21 ESR650 FUK → ICN Jul 21, 12:00 UTCJul 21, 13:05 UTC1h 5m
2026-07-21 ESR649 ICN → FUK Jul 21, 09:40 UTCJul 21, 10:25 UTC45m
2026-07-21 ESR648 FUK → ICN Jul 21, 06:25 UTCJul 21, 07:20 UTC55m
2026-07-21 ESR647 ICN → FUK Jul 21, 04:00 UTCJul 21, 04:50 UTC50m
2026-07-20 ESR650 FUK → ICN Jul 20, 11:55 UTCJul 20, 12:55 UTC1h 0m
2026-07-20 ESR649 ICN → FUK Jul 20, 09:45 UTCJul 20, 10:35 UTC50m
2026-07-20 ESR648 FUK → ICN Jul 20, 07:10 UTCJul 20, 08:05 UTC55m
2026-07-20 ESR647 - Jul 20, 05:10 UTCJul 20, 06:00 UTC50m
2026-07-20 ESR818 YNT → ICN Jul 20, 03:05 UTCJul 20, 03:40 UTC35m
2026-07-20 ESR817 ICN → YNT Jul 20, 00:15 UTCJul 20, 00:35 UTC20m
2026-07-19 ESR862 HKG → ICN Jul 19, 16:20 UTCJul 19, 19:30 UTC3h 10m
2026-07-19 ESR861 - Jul 19, 11:40 UTCJul 19, 14:45 UTC3h 5m
2026-07-19 ESR820 - Jul 19, 08:40 UTCJul 19, 09:00 UTC20m
2026-07-19 ESR819 - Jul 19, 05:35 UTCJul 19, 05:55 UTC20m
2026-07-19 ESR606 NRT → ICN Jul 19, 02:20 UTCJul 19, 04:10 UTC1h 50m
2026-07-18 ESR605 ICN → NRT Jul 18, 22:45 UTCJul 19, 00:35 UTC1h 50m
2026-07-18 ESR872 ICN → ICN Jul 18, 13:35 UTCJul 18, 18:35 UTC5h 0m
2026-07-18 ESR604 NRT → ICN Jul 18, 09:55 UTCJul 18, 11:45 UTC1h 50m
2026-07-18 ESR603 ICN → NRT Jul 18, 06:25 UTCJul 18, 08:30 UTC2h 5m
2026-07-18 ESR612 KIX → ICN Jul 18, 03:35 UTCJul 18, 04:55 UTC1h 20m
2026-07-18 ESR611 ICN → KIX Jul 18, 00:45 UTCJul 18, 02:14 UTC1h 30m
2026-07-17 ESR8532 NTG → ICN Jul 17, 11:10 UTCJul 17, 11:50 UTC40m
2026-07-17 ESR8531 ICN → NTG Jul 17, 06:54 UTCJul 17, 07:40 UTC45m
2026-07-17 ESR602 NRT → ICN Jul 17, 02:45 UTCJul 17, 04:44 UTC2h 0m
2026-07-16 ESR601 ICN → NRT Jul 16, 23:20 UTCJul 17, 01:20 UTC2h 0m

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 HL8375 page for operator, model, and routing details .

Mode-S 71C375 frequently asked

What is Mode-S code 71C375?
71C375 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8375.
Where is Mode-S 71C375 registered?
Mode-S code 71C375 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 71C375 broadcasting right now?
Yes. Mode-S 71C375 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C375, octal 34341565, decimal 7,455,605.
What flights does 71C375 operate?
Mode-S 71C375 has broadcast 20 distinct callsigns, including ESR646, ESR645, ESR872, ESR611, ESR604.