Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 1h ago
Flights observed
405
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

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
ESR781 Eastar Jet 20 2026-05-27
ESR272 Eastar Jet 20 2026-05-28
ESR274 Eastar Jet 19 2026-05-28
ESR273 Eastar Jet 19 2026-05-28
ESR276 Eastar Jet 18 2026-05-26
ESR782 Eastar Jet 17 2026-05-27
ESR277 Eastar Jet 17 2026-05-26
ESR278 Eastar Jet 16 2026-05-26
ESR271 Eastar Jet 16 2026-05-25
ESR275 Eastar Jet 15 2026-05-26
ESR233 Eastar Jet 14 2026-05-28
ESR224 Eastar Jet 14 2026-05-28
ESR223 Eastar Jet 14 2026-05-28
ESR716 Eastar Jet 12 2026-05-27
ESR711 Eastar Jet 12 2026-05-27
ESR214 Eastar Jet 10 2026-05-20
ESR281 Eastar Jet 9 2026-05-20
ESR204 Eastar Jet 8 2026-05-30
ESR228 Eastar Jet 7 2026-05-18
ESR227 Eastar Jet 7 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ESR284 CJU → GMP May 30, 08:25 UTCMay 30, 09:00 UTC35m
2026-05-30 ESR219 GMP → CJU May 30, 05:55 UTCMay 30, 06:20 UTC25m
2026-05-30 ESR212 CJU → GMP May 30, 04:10 UTCMay 30, 04:50 UTC40m
2026-05-30 ESR211 GMP → CJU May 30, 02:00 UTCMay 30, 02:25 UTC25m
2026-05-30 ESR204 CJU → GMP May 30, 00:25 UTCMay 30, 01:00 UTC35m
2026-05-29 ESR235 GMP → CJU May 29, 12:50 UTCMay 29, 13:10 UTC20m
2026-05-29 ESR226 CJU → GMP May 29, 11:15 UTCMay 29, 11:45 UTC30m
2026-05-29 ESR225 GMP → CJU May 29, 09:10 UTCMay 29, 09:35 UTC25m
2026-05-29 ESR218 CJU → GMP May 29, 07:40 UTCMay 29, 08:10 UTC30m
2026-05-29 ESR215 GMP → CJU May 29, 05:25 UTCMay 29, 05:50 UTC25m
2026-05-29 ESR210 CJU → GMP May 29, 03:25 UTCMay 29, 04:00 UTC35m
2026-05-29 ESR209 GMP → CJU May 29, 01:10 UTCMay 29, 01:35 UTC25m
2026-05-28 ESR202 CJU → GMP May 28, 23:25 UTCMay 28, 23:55 UTC30m
2026-05-28 ESR201 GMP → CJU May 28, 21:20 UTCMay 28, 21:45 UTC25m
2026-05-28 ESR232 CJU → GMP May 28, 13:10 UTCMay 28, 13:40 UTC30m
2026-05-28 ESR233 GMP → CJU May 28, 11:00 UTCMay 28, 11:25 UTC25m
2026-05-28 ESR224 CJU → GMP May 28, 09:40 UTCMay 28, 10:10 UTC30m
2026-05-28 ESR223 GMP → CJU May 28, 07:40 UTCMay 28, 08:05 UTC25m
2026-05-28 ESR274 CJU → GMP May 28, 05:55 UTCMay 28, 06:25 UTC30m
2026-05-28 ESR273 GMP → CJU May 28, 03:20 UTCMay 28, 03:50 UTC30m
2026-05-28 ESR272 CJU → GMP May 28, 01:15 UTCMay 28, 01:45 UTC30m
2026-05-27 ESR711 CJJ → CJU May 27, 22:55 UTCMay 27, 23:10 UTC15m
2026-05-27 ESR782 TPE → CJJ May 27, 20:25 UTCMay 27, 20:50 UTC25m
2026-05-27 ESR782 TPE → CJJ May 27, 18:45 UTCMay 27, 19:15 UTC30m
2026-05-27 ESR781 CJJ → TPE May 27, 14:40 UTCMay 27, 16:35 UTC1h 55m
2026-05-27 ESR716 CJU → CJJ May 27, 13:10 UTCMay 27, 13:30 UTC20m
2026-05-27 ESR233 GMP → CJU May 27, 10:55 UTCMay 27, 11:15 UTC20m
2026-05-27 ESR224 CJU → GMP May 27, 09:25 UTCMay 27, 09:55 UTC30m
2026-05-27 ESR223 GMP → CJU May 27, 07:20 UTCMay 27, 07:45 UTC25m
2026-05-27 ESR216 CJU → GMP May 27, 05:45 UTCMay 27, 06:25 UTC40m
2026-05-27 ESR213 GMP → CJU May 27, 03:04 UTCMay 27, 03:29 UTC25m
2026-05-27 ESR208 CJU → GMP May 27, 01:29 UTCMay 27, 02:04 UTC35m
2026-05-26 ESR207 GMP → CJU May 26, 22:54 UTCMay 26, 23:19 UTC25m
2026-05-26 ESR278 CJU → GMP May 26, 13:24 UTCMay 26, 13:54 UTC30m
2026-05-26 ESR277 GMP → CJU May 26, 11:20 UTCMay 26, 11:44 UTC25m
2026-05-26 ESR276 CJU → GMP May 26, 09:40 UTCMay 26, 10:14 UTC35m
2026-05-26 ESR275 GMP → CJU May 26, 07:15 UTCMay 26, 07:40 UTC25m
2026-05-26 ESR274 CJU → GMP May 26, 05:15 UTCMay 26, 05:45 UTC30m
2026-05-26 ESR273 GMP → CJU May 26, 03:00 UTCMay 26, 03:25 UTC25m
2026-05-26 ESR272 CJU → GMP May 26, 01:24 UTCMay 26, 01:49 UTC25m
2026-05-25 ESR271 GMP → CJU May 25, 23:00 UTCMay 25, 23:24 UTC25m
2026-05-25 ESR278 CJU → GMP May 25, 12:50 UTCMay 25, 13:20 UTC30m
2026-05-25 ESR277 GMP → CJU May 25, 10:20 UTCMay 25, 10:45 UTC25m
2026-05-25 ESR222 CJU → GMP May 25, 08:35 UTCMay 25, 09:05 UTC30m
2026-05-25 ESR221 GMP → CJU May 25, 06:15 UTCMay 25, 06:40 UTC25m
2026-05-24 ESR278 CJU → GMP May 24, 13:10 UTCMay 24, 13:40 UTC30m
2026-05-24 ESR277 GMP → CJU May 24, 10:50 UTCMay 24, 11:15 UTC25m
2026-05-24 ESR276 CJU → GMP May 24, 09:20 UTCMay 24, 09:50 UTC30m
2026-05-24 ESR275 GMP → CJU May 24, 07:00 UTCMay 24, 07:25 UTC25m
2026-05-24 ESR274 CJU → GMP May 24, 05:20 UTCMay 24, 05:50 UTC30m

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 1h ago.
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 ESR781, ESR272, ESR274, ESR273, ESR276.