Apparatus

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sensors Mode-S transponder

71C578

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

Currently assigned to HL8578 · BOEING 737-800

Hex
71C578
Octal
34342570
Decimal
7,456,120
Country
KR
Tail
HL8578
Type
B738
No current signal · last broadcast Jul 26, 11:55 UTC
Flights observed
752
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 11:55 UTC

Last known position

Most recent position reported by Mode-S 71C578.

Country allocation

The ICAO 24-bit address 71C578 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
ESR272 - 30 2026-07-21
ESR277 - 29 2026-07-20
ESR278 Eastar Jet 28 2026-07-25
ESR274 Eastar Jet 28 2026-07-21
ESR273 Eastar Jet 28 2026-07-21
ESR276 - 26 2026-07-21
ESR271 Eastar Jet 25 2026-07-20
ESR781 - 23 2026-06-29
ESR275 Eastar Jet 23 2026-07-21
ESR204 Eastar Jet 21 2026-07-25
ESR782 - 20 2026-06-29
ESR233 - 20 2026-07-10
ESR224 - 20 2026-07-10
ESR223 - 20 2026-07-10
ESR214 Eastar Jet 19 2026-07-20
ESR716 - 18 2026-07-10
ESR711 - 18 2026-07-10
ESR281 Eastar Jet 18 2026-07-20
ESR235 Eastar Jet 17 2026-07-26
ESR282 - 15 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR235 GMP → CJU Jul 26, 11:25 UTCJul 26, 11:55 UTC30m
2026-07-26 ESR226 CJU → GMP Jul 26, 09:40 UTCJul 26, 10:15 UTC35m
2026-07-26 ESR225 GMP → CJU Jul 26, 07:40 UTCJul 26, 08:10 UTC30m
2026-07-26 ESR218 CJU → GMP Jul 26, 06:00 UTCJul 26, 06:40 UTC41m
2026-07-26 ESR215 GMP → CJU Jul 26, 03:45 UTCJul 26, 04:20 UTC35m
2026-07-26 ESR208 CJU → GMP Jul 26, 01:00 UTCJul 26, 01:40 UTC40m
2026-07-25 ESR207 GMP → CJU Jul 25, 22:50 UTCJul 25, 23:25 UTC35m
2026-07-25 ESR278 CJU → GMP Jul 25, 12:45 UTCJul 25, 13:30 UTC45m
2026-07-25 ESR229 GMP → CJU Jul 25, 09:55 UTCJul 25, 10:25 UTC30m
2026-07-25 ESR888 TSA → GMP Jul 25, 06:10 UTCJul 25, 08:25 UTC2h 15m
2026-07-25 ESR887 GMP → TSA Jul 25, 04:15 UTCJul 25, 04:30 UTC15m
2026-07-25 ESR887 GMP → TSA Jul 25, 02:25 UTCJul 25, 03:10 UTC45m
2026-07-25 ESR204 CJU → GMP Jul 25, 00:25 UTCJul 25, 01:05 UTC40m
2026-07-24 ESR235 GMP → CJU Jul 24, 11:35 UTCJul 24, 12:10 UTC35m
2026-07-24 ESR226 CJU → GMP Jul 24, 09:50 UTCJul 24, 10:30 UTC40m
2026-07-24 ESR225 GMP → CJU Jul 24, 07:45 UTCJul 24, 08:25 UTC40m
2026-07-24 ESR218 CJU → GMP Jul 24, 06:05 UTCJul 24, 06:45 UTC40m
2026-07-24 ESR215 GMP → CJU Jul 24, 03:50 UTCJul 24, 04:25 UTC35m
2026-07-24 ESR208 CJU → GMP Jul 24, 01:15 UTCJul 24, 02:00 UTC45m
2026-07-23 ESR207 GMP → CJU Jul 23, 22:50 UTCJul 23, 23:25 UTC35m
2026-07-23 ESR228 CJU → GMP Jul 23, 11:55 UTCJul 23, 12:35 UTC40m
2026-07-23 ESR229 GMP → CJU Jul 23, 09:50 UTCJul 23, 10:25 UTC35m
2026-07-23 ESR888 TSA → GMP Jul 23, 06:10 UTCJul 23, 08:25 UTC2h 15m
2026-07-23 ESR887 GMP → TSA Jul 23, 04:25 UTCJul 23, 04:50 UTC25m
2026-07-23 ESR887 GMP → TSA Jul 23, 02:45 UTCJul 23, 03:20 UTC35m
2026-07-23 ESR204 CJU → GMP Jul 23, 00:30 UTCJul 23, 01:15 UTC45m
2026-07-22 ESR235 GMP → CJU Jul 22, 11:30 UTCJul 22, 12:00 UTC30m
2026-07-22 ESR215 GMP → CJU Jul 22, 03:55 UTCJul 22, 04:30 UTC35m
2026-07-22 ESR208 CJU → GMP Jul 22, 01:00 UTCJul 22, 01:50 UTC50m
2026-07-21 ESR207 GMP → CJU Jul 21, 22:55 UTCJul 21, 23:30 UTC35m
2026-07-21 ESR232 CJU → GMP Jul 21, 13:05 UTCJul 21, 13:45 UTC40m
2026-07-21 ESR231 GMP → CJU Jul 21, 10:50 UTCJul 21, 11:30 UTC40m
2026-07-21 ESR276 - Jul 21, 09:05 UTCJul 21, 09:45 UTC40m
2026-07-21 ESR275 GMP → CJU Jul 21, 06:50 UTCJul 21, 07:30 UTC40m
2026-07-21 ESR274 CJU → GMP Jul 21, 05:00 UTCJul 21, 05:45 UTC45m
2026-07-21 ESR273 GMP → CJU Jul 21, 02:55 UTCJul 21, 03:30 UTC35m
2026-07-21 ESR272 - Jul 21, 01:10 UTCJul 21, 01:50 UTC40m
2026-07-20 ESR271 GMP → CJU Jul 20, 22:50 UTCJul 20, 23:25 UTC35m
2026-07-20 ESR278 - Jul 20, 13:10 UTCJul 20, 13:50 UTC40m
2026-07-20 ESR277 - Jul 20, 10:45 UTCJul 20, 11:25 UTC40m
2026-07-20 ESR222 CJU → GMP Jul 20, 08:50 UTCJul 20, 09:30 UTC40m
2026-07-20 ESR221 GMP → CJU Jul 20, 06:30 UTCJul 20, 07:10 UTC40m
2026-07-20 ESR214 CJU → GMP Jul 20, 04:40 UTCJul 20, 05:25 UTC45m
2026-07-20 ESR281 GMP → CJU Jul 20, 02:40 UTCJul 20, 03:15 UTC35m
2026-07-20 ESR282 - Jul 20, 00:55 UTCJul 20, 01:35 UTC40m
2026-07-19 ESR205 GMP → CJU Jul 19, 22:00 UTCJul 19, 22:35 UTC35m
2026-07-19 ESR278 - Jul 19, 12:35 UTCJul 19, 13:10 UTC35m
2026-07-19 ESR277 - Jul 19, 10:25 UTCJul 19, 11:05 UTC40m
2026-07-19 ESR222 - Jul 19, 08:30 UTCJul 19, 09:10 UTC40m
2026-07-19 ESR221 - Jul 19, 06:15 UTCJul 19, 06:50 UTC35m

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 HL8578 page for operator, model, and routing details .

Mode-S 71C578 frequently asked

What is Mode-S code 71C578?
71C578 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8578.
Where is Mode-S 71C578 registered?
Mode-S code 71C578 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 71C578 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C578, octal 34342570, decimal 7,456,120.
What flights does 71C578 operate?
Mode-S 71C578 has broadcast 20 distinct callsigns, including ESR272, ESR277, ESR278, ESR274, ESR273.