Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 ESR603 · 10,725 ft
Flights observed
211
Distinct callsigns
20
Country
KR
Last broadcast
1h 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
ESR872 Eastar Jet 16 2026-06-08
ESR607 Eastar Jet 14 2026-06-07
ESR608 Eastar Jet 13 2026-06-07
ESR604 Eastar Jet 12 2026-06-09
ESR603 Eastar Jet 12 2026-06-12
ESR646 Eastar Jet 11 2026-06-08
ESR606 Eastar Jet 11 2026-06-07
ESR605 Eastar Jet 11 2026-06-06
ESR645 Eastar Jet 10 2026-06-08
ESR612 Eastar Jet 6 2026-06-09
ESR611 Eastar Jet 6 2026-06-09
ESR881 Eastar Jet 5 2026-05-24
ESR871 Eastar Jet 5 2026-06-02
ESR671 Eastar Jet 5 2026-06-06
ESR650 Eastar Jet 5 2026-06-11
ESR649 Eastar Jet 5 2026-06-11
ESR882 Eastar Jet 4 2026-05-24
ESR854 Eastar Jet 4 2026-06-08
ESR853 Eastar Jet 4 2026-06-08
ESR672 Eastar Jet 4 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 ESR603 ICN → NRT Jun 12, 06:50 UTCJun 12, 07:15 UTC25m
2026-06-12 ESR602 NRT → ICN Jun 12, 04:35 UTCJun 12, 05:15 UTC40m
2026-06-12 ESR602 NRT → ICN Jun 12, 02:45 UTCJun 12, 04:00 UTC1h 15m
2026-06-11 ESR601 - Jun 11, 23:20 UTCJun 12, 01:15 UTC1h 56m
2026-06-11 ESR650 FUK → ICN Jun 11, 11:55 UTCJun 11, 12:55 UTC1h 0m
2026-06-11 ESR649 ICN → FUK Jun 11, 09:25 UTCJun 11, 10:00 UTC35m
2026-06-11 ESR626 CTS → ICN Jun 11, 04:00 UTCJun 11, 07:00 UTC3h 0m
2026-06-11 ESR625 ICN → CTS Jun 11, 00:35 UTCJun 11, 02:45 UTC2h 10m
2026-06-10 ESR626 CTS → ICN Jun 10, 06:35 UTCJun 10, 07:10 UTC35m
2026-06-10 ESR626 CTS → ICN Jun 10, 04:10 UTCJun 10, 06:05 UTC1h 55m
2026-06-10 ESR625 ICN → CTS Jun 10, 00:40 UTCJun 10, 02:40 UTC2h 0m
2026-06-09 ESR604 NRT → ICN Jun 9, 10:10 UTCJun 9, 12:25 UTC2h 15m
2026-06-09 ESR603 ICN → NRT Jun 9, 06:35 UTCJun 9, 08:15 UTC1h 40m
2026-06-09 ESR612 KIX → ICN Jun 9, 03:25 UTCJun 9, 04:50 UTC1h 25m
2026-06-09 ESR611 ICN → KIX Jun 9, 00:20 UTCJun 9, 01:40 UTC1h 20m
2026-06-08 ESR872 PVG → ICN Jun 8, 13:40 UTCJun 8, 18:15 UTC4h 35m
2026-06-08 ESR854 CGO → ICN Jun 8, 10:35 UTCJun 8, 11:05 UTC30m
2026-06-08 ESR853 ICN → CGO Jun 8, 05:10 UTCJun 8, 05:25 UTC15m
2026-06-08 ESR646 FUK → ICN Jun 8, 02:45 UTCJun 8, 03:40 UTC55m
2026-06-08 ESR645 ICN → FUK Jun 8, 00:00 UTCJun 8, 00:30 UTC30m
2026-06-07 ESR872 PVG → ICN Jun 7, 13:50 UTCJun 7, 18:05 UTC4h 15m
2026-06-07 ESR608 NRT → ICN Jun 7, 09:15 UTCJun 7, 11:15 UTC2h 0m
2026-06-07 ESR607 ICN → NRT Jun 7, 05:55 UTCJun 7, 07:50 UTC1h 55m
2026-06-07 ESR606 NRT → ICN Jun 7, 02:19 UTCJun 7, 04:20 UTC2h 0m
2026-06-06 ESR605 ICN → NRT Jun 6, 22:30 UTCJun 7, 00:25 UTC1h 55m
2026-06-06 ESR862 HKG → ICN Jun 6, 20:05 UTCJun 6, 20:35 UTC30m
2026-06-06 ESR862 HKG → ICN Jun 6, 17:34 UTCJun 6, 18:59 UTC1h 25m
2026-06-06 ESR861 ICN → HKG Jun 6, 15:19 UTCJun 6, 15:39 UTC20m
2026-06-06 ESR861 ICN → HKG Jun 6, 12:14 UTCJun 6, 14:45 UTC2h 30m
2026-06-06 ESR672 TKS → ICN Jun 6, 07:35 UTCJun 6, 08:55 UTC1h 20m
2026-06-06 ESR671 ICN → TKS Jun 6, 05:00 UTCJun 6, 06:15 UTC1h 15m
2026-06-06 ESR818 YNT → ICN Jun 6, 03:15 UTCJun 6, 03:45 UTC30m
2026-06-06 ESR817 ICN → YNT Jun 6, 00:05 UTCJun 6, 00:25 UTC20m
2026-06-05 ESR608 NRT → ICN Jun 5, 09:10 UTCJun 5, 11:25 UTC2h 15m
2026-06-05 ESR607 ICN → NRT Jun 5, 05:20 UTCJun 5, 07:20 UTC2h 0m
2026-06-05 ESR606 NRT → ICN Jun 5, 01:50 UTCJun 5, 04:00 UTC2h 10m
2026-06-04 ESR605 ICN → NRT Jun 4, 22:35 UTCJun 5, 00:30 UTC1h 55m
2026-06-04 ESR650 FUK → ICN Jun 4, 11:55 UTCJun 4, 12:55 UTC1h 0m
2026-06-04 ESR649 ICN → FUK Jun 4, 09:25 UTCJun 4, 09:55 UTC30m
2026-06-04 ESR612 KIX → ICN Jun 4, 03:30 UTCJun 4, 05:00 UTC1h 30m
2026-06-04 ESR611 ICN → KIX Jun 4, 00:35 UTCJun 4, 02:00 UTC1h 25m
2026-06-03 ESR562 CXR → ICN Jun 3, 12:50 UTCJun 3, 23:05 UTC10h 15m
2026-06-03 ESR854 CGO → ICN Jun 3, 10:20 UTCJun 3, 10:45 UTC25m
2026-06-03 ESR853 ICN → CGO Jun 3, 05:15 UTCJun 3, 05:35 UTC20m
2026-06-02 ESR871 ICN → PVG Jun 2, 13:40 UTCJun 2, 18:10 UTC4h 30m
2026-06-02 ESR633 ICN → OKA Jun 2, 06:20 UTCJun 2, 11:40 UTC5h 20m
2026-06-02 ESR606 NRT → ICN Jun 2, 02:10 UTCJun 2, 04:05 UTC1h 55m
2026-06-01 ESR605 ICN → NRT Jun 1, 22:35 UTCJun 2, 00:30 UTC1h 55m
2026-06-01 ESR604 NRT → ICN Jun 1, 10:10 UTCJun 1, 12:20 UTC2h 10m
2026-06-01 ESR603 ICN → NRT Jun 1, 06:45 UTCJun 1, 08:35 UTC1h 50m

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 ESR872, ESR607, ESR608, ESR604, ESR603.