Apparatus

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sensors Mode-S transponder

71C541

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

Currently assigned to HL8541 · BOEING 737 MAX 8

Hex
71C541
Octal
34342501
Decimal
7,456,065
Country
KR
Tail
HL8541
Type
B38M
No current signal · last broadcast 1d ago
Flights observed
211
Distinct callsigns
20
Country
KR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 71C541.

Country allocation

The ICAO 24-bit address 71C541 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
ESR632 Eastar Jet 19 2026-05-14
ESR631 Eastar Jet 18 2026-05-14
ESR861 Eastar Jet 15 2026-05-14
ESR536 Eastar Jet 12 2026-05-16
ESR862 Eastar Jet 10 2026-05-14
ESR817 Eastar Jet 6 2026-05-16
ESR626 Eastar Jet 6 2026-05-13
ESR951 Eastar Jet 5 2026-05-24
ESR881 Eastar Jet 5 2026-05-17
ESR818 Eastar Jet 5 2026-05-16
ESR647 Eastar Jet 5 2026-05-17
ESR625 Eastar Jet 5 2026-05-13
ESR882 Eastar Jet 4 2026-05-18
ESR648 Eastar Jet 4 2026-05-07
ESR613 Eastar Jet 4 2026-05-09
ESR604 Eastar Jet 4 2026-04-21
ESR603 Eastar Jet 4 2026-04-21
ESR535 Eastar Jet 4 2026-05-03
ESR952 Eastar Jet 3 2026-05-25
ESR853 Eastar Jet 3 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 ESR984 TPE → PUS May 28, 19:05 UTCMay 28, 19:25 UTC20m
2026-05-28 ESR885 CJU → TPE May 28, 15:05 UTCMay 28, 15:30 UTC25m
2026-05-28 ESR715 CJJ → CJU May 28, 11:40 UTCMay 28, 12:00 UTC20m
2026-05-28 ESR722 CJU → CJJ May 28, 10:00 UTCMay 28, 10:20 UTC20m
2026-05-28 ESR213 GMP → CJU May 28, 03:15 UTCMay 28, 03:40 UTC25m
2026-05-28 ESR208 CJU → GMP May 28, 01:10 UTCMay 28, 01:40 UTC30m
2026-05-27 ESR207 GMP → CJU May 27, 22:50 UTCMay 27, 23:15 UTC25m
2026-05-27 ESR228 CJU → GMP May 27, 11:25 UTCMay 27, 11:55 UTC30m
2026-05-27 ESR227 GMP → CJU May 27, 09:10 UTCMay 27, 09:35 UTC25m
2026-05-27 ESR220 CJU → GMP May 27, 07:30 UTCMay 27, 08:05 UTC35m
2026-05-27 ESR217 GMP → CJU May 27, 05:19 UTCMay 27, 05:45 UTC25m
2026-05-27 ESR210 CJU → GMP May 27, 03:45 UTCMay 27, 04:24 UTC40m
2026-05-27 ESR209 GMP → CJU May 27, 01:19 UTCMay 27, 01:44 UTC25m
2026-05-26 ESR202 CJU → GMP May 26, 23:45 UTCMay 27, 00:19 UTC35m
2026-05-26 ESR886 TPE → CJU May 26, 20:20 UTCMay 26, 20:45 UTC25m
2026-05-26 ESR983 PUS → TPE May 26, 14:50 UTCMay 26, 15:14 UTC25m
2026-05-25 ESR988 TPE → PUS May 25, 18:55 UTCMay 25, 19:20 UTC25m
2026-05-25 ESR952 CTS → PUS May 25, 09:45 UTCMay 25, 15:25 UTC5h 40m
2026-05-24 ESR951 PUS → CTS May 24, 18:55 UTCMay 25, 08:30 UTC13h 35m
2026-05-24 ESR951 PUS → CTS May 24, 12:20 UTCMay 25, 08:30 UTC20h 10m
2026-05-24 ESR951 PUS → CTS May 24, 11:25 UTCMay 25, 08:30 UTC21h 5m
2026-05-24 ESR982 PQC → PUS May 24, 07:15 UTCMay 24, 20:10 UTC12h 55m
2026-05-24 ESR915 PUS → KIX May 24, 05:00 UTCMay 24, 05:40 UTC40m
2026-05-23 ESR988 TPE → PUS May 23, 18:45 UTCMay 23, 19:05 UTC20m
2026-05-23 ESR916 KIX → PUS May 23, 07:15 UTCMay 23, 15:40 UTC8h 25m
2026-05-23 ESR915 PUS → KIX May 23, 04:55 UTCMay 23, 05:40 UTC45m
2026-05-22 ESR952 CTS → PUS May 22, 09:25 UTCMay 22, 11:00 UTC1h 35m
2026-05-22 ESR951 PUS → CTS May 22, 03:35 UTCMay 22, 08:10 UTC4h 35m
2026-05-22 ESR913 PUS → KIX May 22, 01:35 UTCMay 22, 02:15 UTC40m
2026-05-21 ESR918 CNX → PUS May 21, 16:20 UTCMay 21, 16:30 UTC10m
2026-05-21 ESR917 PUS → CNX May 21, 14:25 UTCMay 21, 15:00 UTC35m
2026-05-21 ESR968 KMJ → PUS May 21, 06:05 UTCMay 21, 06:15 UTC10m
2026-05-21 ESR967 PUS → KMJ May 21, 03:55 UTCMay 21, 04:05 UTC10m
2026-05-20 ESR271 GMP → CJU May 20, 22:55 UTCMay 20, 23:20 UTC25m
2026-05-20 ESR284 CJU → GMP May 20, 08:25 UTCMay 20, 09:00 UTC35m
2026-05-20 ESR219 GMP → CJU May 20, 06:05 UTCMay 20, 06:30 UTC25m
2026-05-20 ESR212 CJU → GMP May 20, 04:20 UTCMay 20, 04:55 UTC36m
2026-05-20 ESR211 GMP → CJU May 20, 02:10 UTCMay 20, 02:35 UTC25m
2026-05-20 ESR206 CJU → GMP May 20, 00:30 UTCMay 20, 01:05 UTC35m
2026-05-19 ESR952 CTS → PUS May 19, 10:55 UTCMay 19, 12:35 UTC1h 40m
2026-05-19 ESR951 PUS → CTS May 19, 02:40 UTCMay 19, 07:30 UTC4h 50m
2026-05-18 ESR913 PUS → KIX May 18, 18:55 UTCMay 19, 01:05 UTC6h 10m
2026-05-18 ESR987 PUS → TPE May 18, 14:45 UTCMay 18, 15:15 UTC30m
2026-05-18 ESR109F - May 18, 06:35 UTCMay 18, 07:05 UTC30m
2026-05-18 ESR882 TPE → ICN May 18, 02:50 UTCMay 18, 04:55 UTC2h 5m
2026-05-17 ESR881 ICN → TPE May 17, 22:55 UTCMay 18, 01:10 UTC2h 15m
2026-05-17 ESR650 FUK → ICN May 17, 11:55 UTCMay 17, 12:55 UTC1h 0m
2026-05-17 ESR649 ICN → FUK May 17, 09:35 UTCMay 17, 10:05 UTC30m
2026-05-17 ESR647 ICN → FUK May 17, 03:40 UTCMay 17, 07:20 UTC3h 40m
2026-05-16 ESR536 MDC → ICN May 16, 11:46 UTCMay 17, 00:00 UTC12h 15m

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 HL8541 page for operator, model, and routing details .

Mode-S 71C541 frequently asked

What is Mode-S code 71C541?
71C541 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8541.
Where is Mode-S 71C541 registered?
Mode-S code 71C541 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 71C541 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C541, octal 34342501, decimal 7,456,065.
What flights does 71C541 operate?
Mode-S 71C541 has broadcast 20 distinct callsigns, including ESR632, ESR631, ESR861, ESR536, ESR862.