Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C543

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

Currently assigned to HL8543 · BOEING 737 MAX 8

Hex
71C543
Octal
34342503
Decimal
7,456,067
Country
KR
Tail
HL8543
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
209
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C543.

Country allocation

The ICAO 24-bit address 71C543 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
ESR861 Eastar Jet 14 2026-05-26
ESR613 Eastar Jet 10 2026-05-31
ESR862 Eastar Jet 9 2026-05-26
ESR614 Eastar Jet 9 2026-05-31
ESR612 Eastar Jet 9 2026-06-03
ESR611 Eastar Jet 8 2026-06-03
ESR601 Eastar Jet 8 2026-05-24
ESR646 Eastar Jet 7 2026-06-02
ESR645 Eastar Jet 7 2026-06-01
ESR631 Eastar Jet 7 2026-05-22
ESR607 Eastar Jet 7 2026-06-02
ESR602 Eastar Jet 7 2026-05-25
ESR648 Eastar Jet 6 2026-05-28
ESR640 Eastar Jet 6 2026-05-25
ESR639 Eastar Jet 6 2026-05-25
ESR608 Eastar Jet 6 2026-06-02
ESR562 Eastar Jet 6 2026-06-02
ESR647 Eastar Jet 5 2026-05-28
ESR605 Eastar Jet 5 2026-05-18
ESR561 Eastar Jet 5 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-03 ESR603 ICN → NRT Jun 3, 07:05 UTCJun 3, 09:15 UTC2h 10m
2026-06-03 ESR612 KIX → ICN Jun 3, 03:30 UTCJun 3, 04:50 UTC1h 20m
2026-06-03 ESR611 ICN → KIX Jun 3, 00:30 UTCJun 3, 02:00 UTC1h 30m
2026-06-02 ESR562 CXR → ICN Jun 2, 12:30 UTCJun 2, 22:55 UTC10h 25m
2026-06-02 ESR608 NRT → ICN Jun 2, 09:15 UTCJun 2, 11:10 UTC1h 55m
2026-06-02 ESR607 ICN → NRT Jun 2, 05:30 UTCJun 2, 07:25 UTC1h 55m
2026-06-02 ESR646 FUK → ICN Jun 2, 02:40 UTCJun 2, 03:35 UTC55m
2026-06-01 ESR645 ICN → FUK Jun 1, 23:55 UTCJun 2, 00:25 UTC30m
2026-06-01 ESR872 PVG → ICN Jun 1, 13:45 UTCJun 1, 18:25 UTC4h 40m
2026-06-01 ESR854 CGO → ICN Jun 1, 10:35 UTCJun 1, 10:55 UTC20m
2026-06-01 ESR853 ICN → CGO Jun 1, 05:30 UTCJun 1, 05:40 UTC10m
2026-05-31 ESR562 CXR → ICN May 31, 13:25 UTCJun 1, 00:00 UTC10h 35m
2026-05-31 ESR614 KIX → ICN May 31, 10:25 UTCMay 31, 11:50 UTC1h 25m
2026-05-31 ESR613 ICN → KIX May 31, 08:30 UTCMay 31, 09:15 UTC45m
2026-05-30 ESR536 MDC → ICN May 30, 12:35 UTCMay 31, 00:30 UTC11h 55m
2026-05-30 ESR608 NRT → ICN May 30, 08:50 UTCMay 30, 11:10 UTC2h 20m
2026-05-30 ESR607 ICN → NRT May 30, 05:35 UTCMay 30, 07:25 UTC1h 50m
2026-05-30 ESR646 FUK → ICN May 30, 02:35 UTCMay 30, 03:45 UTC1h 10m
2026-05-29 ESR645 ICN → FUK May 29, 23:55 UTCMay 30, 00:20 UTC25m
2026-05-29 ESR608 NRT → ICN May 29, 09:00 UTCMay 29, 11:20 UTC2h 20m
2026-05-29 ESR607 ICN → NRT May 29, 05:45 UTCMay 29, 07:45 UTC2h 0m
2026-05-29 ESR646 FUK → ICN May 29, 03:15 UTCMay 29, 03:55 UTC40m
2026-05-29 ESR645 ICN → FUK May 29, 00:00 UTCMay 29, 00:30 UTC30m
2026-05-28 ESR518 CNX → ICN May 28, 17:30 UTCMay 28, 22:20 UTC4h 50m
2026-05-28 ESR517 ICN → CNX May 28, 09:40 UTCMay 28, 14:45 UTC5h 5m
2026-05-28 ESR648 FUK → ICN May 28, 06:40 UTCMay 28, 07:20 UTC40m
2026-05-28 ESR647 ICN → FUK May 28, 03:40 UTCMay 28, 04:45 UTC1h 5m
2026-05-27 ESR604 NRT → ICN May 27, 10:20 UTCMay 27, 12:20 UTC2h 0m
2026-05-27 ESR603 ICN → NRT May 27, 06:49 UTCMay 27, 08:45 UTC1h 56m
2026-05-27 ESR882 TPE → ICN May 27, 03:09 UTCMay 27, 05:29 UTC2h 20m
2026-05-26 ESR881 ICN → TPE May 26, 22:59 UTCMay 27, 00:44 UTC1h 45m
2026-05-26 ESR862 HKG → ICN May 26, 16:35 UTCMay 26, 19:50 UTC3h 15m
2026-05-26 ESR861 ICN → HKG May 26, 11:44 UTCMay 26, 14:45 UTC3h 0m
2026-05-26 ESR648 FUK → ICN May 26, 03:45 UTCMay 26, 07:19 UTC3h 35m
2026-05-25 ESR594 DAD → ICN May 25, 12:05 UTCMay 25, 23:30 UTC11h 25m
2026-05-25 ESR640 FUK → ICN May 25, 09:10 UTCMay 25, 10:05 UTC55m
2026-05-25 ESR639 ICN → FUK May 25, 06:45 UTCMay 25, 07:15 UTC30m
2026-05-25 ESR602 NRT → ICN May 25, 03:00 UTCMay 25, 05:05 UTC2h 5m
2026-05-24 ESR601 ICN → NRT May 24, 23:15 UTCMay 24, 23:46 UTC31m
2026-05-24 ESR862 HKG → ICN May 24, 16:15 UTCMay 24, 19:30 UTC3h 15m
2026-05-24 ESR861 ICN → HKG May 24, 14:30 UTCMay 24, 14:45 UTC15m
2026-05-24 ESR861 ICN → HKG May 24, 11:30 UTCMay 24, 13:55 UTC2h 25m
2026-05-24 ESR640 FUK → ICN May 24, 09:05 UTCMay 24, 10:00 UTC55m
2026-05-24 ESR639 ICN → FUK May 24, 06:40 UTCMay 24, 07:10 UTC30m
2026-05-24 ESR602 NRT → ICN May 24, 02:55 UTCMay 24, 04:55 UTC2h 0m
2026-05-23 ESR601 ICN → NRT May 23, 23:20 UTCMay 24, 01:10 UTC1h 50m
2026-05-23 ESR862 HKG → ICN May 23, 16:35 UTCMay 23, 19:40 UTC3h 6m
2026-05-23 ESR861 ICN → HKG May 23, 14:50 UTCMay 23, 15:05 UTC15m
2026-05-23 ESR861 ICN → HKG May 23, 12:00 UTCMay 23, 14:15 UTC2h 15m
2026-05-23 ESR640 FUK → ICN May 23, 09:20 UTCMay 23, 10:20 UTC1h 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 HL8543 page for operator, model, and routing details .

Mode-S 71C543 frequently asked

What is Mode-S code 71C543?
71C543 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8543.
Where is Mode-S 71C543 registered?
Mode-S code 71C543 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 71C543 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 71C543, octal 34342503, decimal 7,456,067.
What flights does 71C543 operate?
Mode-S 71C543 has broadcast 20 distinct callsigns, including ESR861, ESR613, ESR862, ESR614, ESR612.