Apparatus

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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 Jul 26, 21:55 UTC
Flights observed
443
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:55 UTC

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 - 22 2026-07-06
ESR613 - 21 2026-07-18
ESR614 - 20 2026-07-18
ESR601 Eastar Jet 17 2026-07-21
ESR602 Eastar Jet 16 2026-07-22
ESR862 - 15 2026-07-06
ESR612 - 15 2026-07-19
ESR648 Eastar Jet 14 2026-07-26
ESR611 - 14 2026-07-19
ESR647 Eastar Jet 13 2026-07-26
ESR646 Eastar Jet 13 2026-07-25
ESR631 - 13 2026-07-14
ESR645 Eastar Jet 12 2026-07-25
ESR605 - 12 2026-07-17
ESR604 - 12 2026-07-20
ESR632 - 11 2026-07-14
ESR607 - 11 2026-06-27
ESR606 - 11 2026-07-18
ESR603 Eastar Jet 11 2026-07-20
ESR608 - 10 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR518 CNX → ICN Jul 26, 17:00 UTCJul 26, 21:55 UTC4h 55m
2026-07-26 ESR517 ICN → CNX Jul 26, 09:50 UTCJul 26, 14:50 UTC5h 0m
2026-07-26 ESR648 FUK → ICN Jul 26, 06:50 UTCJul 26, 07:45 UTC55m
2026-07-26 ESR647 ICN → FUK Jul 26, 03:35 UTCJul 26, 04:45 UTC1h 10m
2026-07-25 ESR536 MDC → ICN Jul 25, 12:05 UTCJul 26, 00:00 UTC11h 55m
2026-07-25 ESR820 YNT → ICN Jul 25, 08:55 UTCJul 25, 09:20 UTC25m
2026-07-25 ESR819 ICN → YNT Jul 25, 05:45 UTCJul 25, 06:10 UTC25m
2026-07-25 ESR646 FUK → ICN Jul 25, 02:45 UTCJul 25, 03:40 UTC55m
2026-07-25 ESR645 ICN → FUK Jul 25, 00:00 UTCJul 25, 00:35 UTC35m
2026-07-24 ESR8532 NTG → ICN Jul 24, 07:00 UTCJul 24, 11:40 UTC4h 40m
2026-07-24 ESR882 TPE → ICN Jul 24, 04:10 UTCJul 24, 05:00 UTC50m
2026-07-24 ESR882 TPE → ICN Jul 24, 02:45 UTCJul 24, 03:00 UTC15m
2026-07-24 ESR881 ICN → TPE Jul 24, 01:15 UTCJul 24, 01:35 UTC20m
2026-07-23 ESR881 ICN → TPE Jul 23, 23:30 UTCJul 24, 00:05 UTC35m
2026-07-23 ESR518 CNX → ICN Jul 23, 17:00 UTCJul 23, 22:00 UTC5h 0m
2026-07-23 ESR517 - Jul 23, 09:55 UTCJul 23, 14:40 UTC4h 45m
2026-07-23 ESR626 CTS → ICN Jul 23, 04:10 UTCJul 23, 06:40 UTC2h 30m
2026-07-23 ESR625 ICN → CTS Jul 23, 00:30 UTCJul 23, 02:45 UTC2h 15m
2026-07-22 ESR518 CNX → ICN Jul 22, 17:05 UTCJul 22, 22:05 UTC5h 0m
2026-07-22 ESR602 NRT → ICN Jul 22, 04:05 UTCJul 22, 14:35 UTC10h 30m
2026-07-21 ESR601 ICN → NRT Jul 21, 23:45 UTCJul 22, 01:45 UTC2h 0m
2026-07-21 ESR594 ICN → ICN Jul 21, 12:15 UTCJul 21, 21:50 UTC9h 35m
2026-07-21 ESR672 TKS → ICN Jul 21, 07:40 UTCJul 21, 09:00 UTC1h 20m
2026-07-21 ESR671 ICN → TKS Jul 21, 05:00 UTCJul 21, 06:20 UTC1h 20m
2026-07-21 ESR818 YNT → ICN Jul 21, 03:20 UTCJul 21, 03:40 UTC20m
2026-07-21 ESR817 ICN → YNT Jul 21, 00:15 UTCJul 21, 00:35 UTC20m
2026-07-20 ESR871 ICN → ICN Jul 20, 14:05 UTCJul 20, 19:20 UTC5h 15m
2026-07-20 ESR604 NRT → ICN Jul 20, 10:25 UTCJul 20, 12:30 UTC2h 5m
2026-07-20 ESR603 ICN → NRT Jul 20, 07:00 UTCJul 20, 09:05 UTC2h 5m
2026-07-20 ESR602 NRT → ICN Jul 20, 03:40 UTCJul 20, 05:40 UTC2h 0m
2026-07-19 ESR601 ICN → NRT Jul 19, 23:20 UTCJul 20, 01:15 UTC1h 55m
2026-07-19 ESR604 NRT → ICN Jul 19, 10:05 UTCJul 19, 11:55 UTC1h 50m
2026-07-19 ESR603 ICN → NRT Jul 19, 06:50 UTCJul 19, 08:50 UTC2h 0m
2026-07-19 ESR612 KIX → ICN Jul 19, 04:05 UTCJul 19, 05:25 UTC1h 20m
2026-07-19 ESR611 ICN → KIX Jul 19, 01:25 UTCJul 19, 02:45 UTC1h 20m
2026-07-18 ESR561 ICN → ICN Jul 18, 12:20 UTCJul 18, 23:40 UTC11h 20m
2026-07-18 ESR614 KIX → ICN Jul 18, 09:20 UTCJul 18, 10:40 UTC1h 20m
2026-07-18 ESR613 ICN → KIX Jul 18, 06:45 UTCJul 18, 08:15 UTC1h 30m
2026-07-18 ESR606 NRT → ICN Jul 18, 02:19 UTCJul 18, 04:10 UTC1h 51m
2026-07-17 ESR605 ICN → NRT Jul 17, 22:40 UTCJul 18, 00:35 UTC1h 55m
2026-07-17 ESR624 - Jul 17, 09:10 UTCJul 17, 11:25 UTC2h 15m
2026-07-17 ESR623 - Jul 17, 05:10 UTCJul 17, 07:30 UTC2h 20m
2026-07-17 ESR646 - Jul 17, 02:39 UTCJul 17, 03:34 UTC55m
2026-07-16 ESR645 ICN → FUK Jul 16, 23:55 UTCJul 17, 00:40 UTC45m
2026-07-16 ESR518 - Jul 16, 16:55 UTCJul 16, 21:40 UTC4h 45m
2026-07-16 ESR517 - Jul 16, 09:45 UTCJul 16, 14:29 UTC4h 45m
2026-07-16 ESR648 - Jul 16, 06:20 UTCJul 16, 07:20 UTC1h 0m
2026-07-16 ESR647 - Jul 16, 03:40 UTCJul 16, 04:30 UTC50m
2026-07-15 ESR561 ICN → ICN Jul 15, 12:35 UTCJul 15, 23:05 UTC10h 30m
2026-07-15 ESR820 - Jul 15, 08:50 UTCJul 15, 09:15 UTC25m

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 Jul 26, 21:55 UTC.
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, ESR614, ESR601, ESR602.