Apparatus

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sensors Mode-S transponder

71C546

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

Currently assigned to HL8546 · BOEING 737-800

Hex
71C546
Octal
34342506
Decimal
7,456,070
Country
KR
Tail
HL8546
Type
B738
No current signal · last broadcast 1h ago
Flights observed
232
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C546.

Country allocation

The ICAO 24-bit address 71C546 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
ESR604 Eastar Jet 9 2026-05-29
ESR983 Eastar Jet 8 2026-04-28
ESR603 Eastar Jet 8 2026-05-29
ESR963 Eastar Jet 6 2026-04-28
ESR818 Eastar Jet 6 2026-05-27
ESR964 Eastar Jet 5 2026-04-29
ESR872 Eastar Jet 5 2026-05-30
ESR817 Eastar Jet 5 2026-05-27
ESR612 Eastar Jet 5 2026-05-29
ESR611 Eastar Jet 5 2026-05-29
ESR984 Eastar Jet 4 2026-04-27
ESR650 Eastar Jet 4 2026-05-30
ESR649 Eastar Jet 4 2026-05-30
ESR606 Eastar Jet 4 2026-05-24
ESR605 Eastar Jet 4 2026-05-23
ESR284 Eastar Jet 4 2026-04-30
ESR230 Eastar Jet 4 2026-04-30
ESR217 Eastar Jet 4 2026-05-02
ESR209 Eastar Jet 4 2026-05-02
ESR988 Eastar Jet 3 2026-04-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ESR872 PVG → ICN May 30, 14:20 UTCMay 30, 18:45 UTC4h 25m
2026-05-30 ESR650 FUK → ICN May 30, 11:55 UTCMay 30, 13:00 UTC1h 5m
2026-05-30 ESR649 ICN → FUK May 30, 09:35 UTCMay 30, 10:00 UTC25m
2026-05-30 ESR8126 ICN → ICN May 30, 02:45 UTCMay 30, 07:50 UTC5h 5m
2026-05-29 ESR872 PVG → ICN May 29, 13:50 UTCMay 29, 18:45 UTC4h 55m
2026-05-29 ESR604 NRT → ICN May 29, 11:45 UTCMay 29, 12:15 UTC30m
2026-05-29 ESR604 NRT → ICN May 29, 10:00 UTCMay 29, 11:10 UTC1h 10m
2026-05-29 ESR603 ICN → NRT May 29, 06:30 UTCMay 29, 08:10 UTC1h 40m
2026-05-29 ESR612 KIX → ICN May 29, 03:25 UTCMay 29, 04:55 UTC1h 30m
2026-05-29 ESR611 ICN → KIX May 29, 00:30 UTCMay 29, 01:45 UTC1h 15m
2026-05-28 ESR604 NRT → ICN May 28, 09:55 UTCMay 28, 11:55 UTC2h 0m
2026-05-28 ESR603 ICN → NRT May 28, 06:30 UTCMay 28, 08:15 UTC1h 45m
2026-05-28 ESR612 KIX → ICN May 28, 03:25 UTCMay 28, 04:50 UTC1h 25m
2026-05-28 ESR611 ICN → KIX May 28, 00:30 UTCMay 28, 01:50 UTC1h 20m
2026-05-27 ESR593 ICN → DAD May 27, 12:50 UTCMay 27, 23:05 UTC10h 15m
2026-05-27 ESR854 CGO → ICN May 27, 10:50 UTCMay 27, 11:15 UTC25m
2026-05-27 ESR853 ICN → CGO May 27, 05:40 UTCMay 27, 05:55 UTC15m
2026-05-27 ESR818 YNT → ICN May 27, 03:39 UTCMay 27, 03:59 UTC20m
2026-05-27 ESR817 ICN → YNT May 27, 00:30 UTCMay 27, 00:49 UTC20m
2026-05-26 ESR672 TKS → ICN May 26, 07:55 UTCMay 26, 09:19 UTC1h 25m
2026-05-26 ESR671 ICN → TKS May 26, 05:20 UTCMay 26, 06:39 UTC1h 20m
2026-05-26 ESR818 YNT → ICN May 26, 03:15 UTCMay 26, 03:35 UTC20m
2026-05-26 ESR817 ICN → YNT May 26, 00:14 UTCMay 26, 00:24 UTC10m
2026-05-25 ESR261F GMP → ICN May 25, 07:05 UTCMay 25, 07:30 UTC25m
2026-05-25 ESR274 CJU → GMP May 25, 05:15 UTCMay 25, 05:50 UTC35m
2026-05-25 ESR273 GMP → CJU May 25, 02:50 UTCMay 25, 03:15 UTC25m
2026-05-24 ESR207 GMP → CJU May 24, 23:00 UTCMay 24, 23:10 UTC10m
2026-05-24 ESR262F ICN → GMP May 24, 21:40 UTCMay 24, 21:50 UTC10m
2026-05-24 ESR872 PVG → ICN May 24, 13:40 UTCMay 24, 18:30 UTC4h 50m
2026-05-24 ESR604 NRT → ICN May 24, 10:10 UTCMay 24, 12:10 UTC2h 0m
2026-05-24 ESR603 ICN → NRT May 24, 06:35 UTCMay 24, 08:30 UTC1h 55m
2026-05-24 ESR606 NRT → ICN May 24, 02:15 UTCMay 24, 04:20 UTC2h 5m
2026-05-23 ESR605 ICN → NRT May 23, 22:35 UTCMay 24, 00:30 UTC1h 55m
2026-05-23 ESR650 FUK → ICN May 23, 12:00 UTCMay 23, 13:00 UTC1h 0m
2026-05-23 ESR649 ICN → FUK May 23, 09:25 UTCMay 23, 09:55 UTC30m
2026-05-23 ESR626 CTS → ICN May 23, 06:30 UTCMay 23, 06:55 UTC25m
2026-05-23 ESR626 CTS → ICN May 23, 04:20 UTCMay 23, 05:55 UTC1h 35m
2026-05-23 ESR625 ICN → CTS May 23, 00:40 UTCMay 23, 02:55 UTC2h 14m
2026-05-22 ESR640 FUK → ICN May 22, 09:40 UTCMay 22, 10:15 UTC35m
2026-05-22 ESR639 ICN → FUK May 22, 06:40 UTCMay 22, 07:10 UTC30m
2026-05-22 ESR602 NRT → ICN May 22, 02:55 UTCMay 22, 05:05 UTC2h 10m
2026-05-21 ESR601 ICN → NRT May 21, 23:20 UTCMay 22, 01:20 UTC2h 0m
2026-05-21 ESR604 NRT → ICN May 21, 10:00 UTCMay 21, 12:15 UTC2h 15m
2026-05-21 ESR603 ICN → NRT May 21, 06:30 UTCMay 21, 08:25 UTC1h 55m
2026-05-21 ESR612 KIX → ICN May 21, 03:15 UTCMay 21, 04:50 UTC1h 35m
2026-05-21 ESR611 ICN → KIX May 21, 00:25 UTCMay 21, 01:55 UTC1h 30m
2026-05-20 ESR8126 - May 20, 10:50 UTCMay 20, 11:25 UTC35m
2026-05-20 ESR8125 - May 20, 06:00 UTCMay 20, 06:25 UTC25m
2026-05-20 ESR606 NRT → ICN May 20, 02:15 UTCMay 20, 04:25 UTC2h 10m
2026-05-19 ESR605 ICN → NRT May 19, 22:40 UTCMay 20, 00:30 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 HL8546 page for operator, model, and routing details .

Mode-S 71C546 frequently asked

What is Mode-S code 71C546?
71C546 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8546.
Where is Mode-S 71C546 registered?
Mode-S code 71C546 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 71C546 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C546, octal 34342506, decimal 7,456,070.
What flights does 71C546 operate?
Mode-S 71C546 has broadcast 20 distinct callsigns, including ESR604, ESR983, ESR603, ESR963, ESR818.