Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C587

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

Currently assigned to HL8587 · BOEING 737-800

Hex
71C587
Octal
34342607
Decimal
7,456,135
Country
KR
Tail
HL8587
Type
B738
No current signal · last broadcast 8h ago
Flights observed
232
Distinct callsigns
20
Country
KR
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 71C587.

Country allocation

The ICAO 24-bit address 71C587 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
ESR983 Eastar Jet 10 2026-05-29
ESR963 Eastar Jet 10 2026-05-05
ESR984 Eastar Jet 8 2026-05-25
ESR967 Eastar Jet 8 2026-05-29
ESR964 Eastar Jet 8 2026-05-05
ESR981 Eastar Jet 7 2026-05-10
ESR951 Eastar Jet 7 2026-05-28
ESR952 Eastar Jet 6 2026-05-28
ESR281 Eastar Jet 6 2026-05-23
ESR214 Eastar Jet 6 2026-05-23
ESR206 Eastar Jet 6 2026-05-18
ESR988 Eastar Jet 5 2026-05-28
ESR915 Eastar Jet 5 2026-05-26
ESR782 Eastar Jet 5 2026-05-22
ESR781 Eastar Jet 5 2026-05-22
ESR284 Eastar Jet 5 2026-05-13
ESR283 Eastar Jet 5 2026-05-13
ESR282 Eastar Jet 5 2026-05-23
ESR271 Eastar Jet 5 2026-05-19
ESR230 Eastar Jet 5 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ESR914 KIX → PUS May 30, 03:40 UTCMay 30, 04:15 UTC35m
2026-05-29 ESR913 PUS → KIX May 29, 19:35 UTCMay 30, 02:10 UTC6h 35m
2026-05-29 ESR983 PUS → TPE May 29, 15:05 UTCMay 29, 15:45 UTC40m
2026-05-29 ESR968 KMJ → PUS May 29, 06:00 UTCMay 29, 06:10 UTC10m
2026-05-29 ESR967 PUS → KMJ May 29, 04:00 UTCMay 29, 04:10 UTC10m
2026-05-28 ESR988 TPE → PUS May 28, 18:45 UTCMay 28, 19:05 UTC20m
2026-05-28 ESR952 CTS → PUS May 28, 08:45 UTCMay 28, 15:20 UTC6h 35m
2026-05-28 ESR951 PUS → CTS May 28, 02:40 UTCMay 28, 07:25 UTC4h 45m
2026-05-27 ESR913 PUS → KIX May 27, 19:20 UTCMay 28, 01:15 UTC5h 55m
2026-05-27 ESR952 CTS → PUS May 27, 08:50 UTCMay 27, 15:25 UTC6h 35m
2026-05-27 ESR951 PUS → CTS May 27, 02:04 UTCMay 27, 07:15 UTC5h 11m
2026-05-26 ESR916 KIX → PUS May 26, 07:10 UTCMay 26, 23:05 UTC15h 55m
2026-05-26 ESR915 PUS → KIX May 26, 04:54 UTCMay 26, 05:45 UTC50m
2026-05-25 ESR984 TPE → PUS May 25, 18:50 UTCMay 25, 19:15 UTC25m
2026-05-25 ESR983 PUS → TPE May 25, 14:45 UTCMay 25, 15:20 UTC35m
2026-05-25 ESR968 KMJ → PUS May 25, 06:05 UTCMay 25, 06:15 UTC10m
2026-05-25 ESR967 PUS → KMJ May 25, 03:55 UTCMay 25, 04:10 UTC15m
2026-05-24 ESR228 CJU → GMP May 24, 11:20 UTCMay 24, 11:50 UTC30m
2026-05-24 ESR227 GMP → CJU May 24, 09:10 UTCMay 24, 09:35 UTC25m
2026-05-24 ESR220 CJU → GMP May 24, 07:25 UTCMay 24, 07:55 UTC30m
2026-05-24 ESR217 GMP → CJU May 24, 04:55 UTCMay 24, 05:20 UTC25m
2026-05-24 ESR210 CJU → GMP May 24, 03:25 UTCMay 24, 03:50 UTC25m
2026-05-24 ESR209 GMP → CJU May 24, 01:15 UTCMay 24, 01:35 UTC20m
2026-05-23 ESR202 CJU → GMP May 23, 23:35 UTCMay 24, 00:05 UTC30m
2026-05-23 ESR201 GMP → CJU May 23, 21:25 UTCMay 23, 21:45 UTC20m
2026-05-23 ESR232 CJU → GMP May 23, 13:10 UTCMay 23, 13:40 UTC30m
2026-05-23 ESR231 GMP → CJU May 23, 10:50 UTCMay 23, 11:10 UTC20m
2026-05-23 ESR222 CJU → GMP May 23, 09:20 UTCMay 23, 09:50 UTC30m
2026-05-23 ESR221 GMP → CJU May 23, 07:10 UTCMay 23, 07:35 UTC25m
2026-05-23 ESR214 CJU → GMP May 23, 05:25 UTCMay 23, 06:00 UTC35m
2026-05-23 ESR281 GMP → CJU May 23, 03:00 UTCMay 23, 03:30 UTC30m
2026-05-23 ESR282 CJU → GMP May 23, 01:20 UTCMay 23, 01:55 UTC35m
2026-05-22 ESR711 CJJ → CJU May 22, 23:00 UTCMay 22, 23:20 UTC20m
2026-05-22 ESR782 TPE → CJJ May 22, 19:05 UTCMay 22, 21:00 UTC1h 55m
2026-05-22 ESR781 CJJ → TPE May 22, 16:55 UTCMay 22, 17:20 UTC25m
2026-05-22 ESR781 CJJ → TPE May 22, 15:15 UTCMay 22, 15:35 UTC20m
2026-05-22 ESR716 CJU → CJJ May 22, 13:45 UTCMay 22, 14:05 UTC20m
2026-05-22 ESR233 GMP → CJU May 22, 11:15 UTCMay 22, 11:40 UTC25m
2026-05-22 ESR224 CJU → GMP May 22, 09:40 UTCMay 22, 10:20 UTC40m
2026-05-22 ESR223 GMP → CJU May 22, 07:25 UTCMay 22, 07:50 UTC25m
2026-05-22 ESR216 CJU → GMP May 22, 05:45 UTCMay 22, 06:25 UTC40m
2026-05-22 ESR213 GMP → CJU May 22, 03:05 UTCMay 22, 03:30 UTC25m
2026-05-22 ESR208 CJU → GMP May 22, 01:30 UTCMay 22, 02:05 UTC35m
2026-05-21 ESR207 GMP → CJU May 21, 23:00 UTCMay 21, 23:25 UTC25m
2026-05-21 ESR228 CJU → GMP May 21, 11:15 UTCMay 21, 11:45 UTC30m
2026-05-21 ESR227 GMP → CJU May 21, 09:05 UTCMay 21, 09:30 UTC25m
2026-05-21 ESR220 CJU → GMP May 21, 07:20 UTCMay 21, 07:50 UTC30m
2026-05-21 ESR217 GMP → CJU May 21, 04:45 UTCMay 21, 05:20 UTC35m
2026-05-21 ESR210 CJU → GMP May 21, 03:20 UTCMay 21, 03:55 UTC35m
2026-05-21 ESR209 GMP → CJU May 21, 01:00 UTCMay 21, 01:35 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 HL8587 page for operator, model, and routing details .

Mode-S 71C587 frequently asked

What is Mode-S code 71C587?
71C587 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8587.
Where is Mode-S 71C587 registered?
Mode-S code 71C587 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 71C587 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C587, octal 34342607, decimal 7,456,135.
What flights does 71C587 operate?
Mode-S 71C587 has broadcast 20 distinct callsigns, including ESR983, ESR963, ESR984, ESR967, ESR964.