Apparatus

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sensors Mode-S transponder

71C507

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

Currently assigned to HL8507 · BOEING 737-800

Hex
71C507
Octal
34342407
Decimal
7,456,007
Country
KR
Tail
HL8507
Type
B738
Transponder active on ground
Flights observed
550
Distinct callsigns
20
Country
KR
Last broadcast
57m ago

Last known position

Most recent position reported by Mode-S 71C507.

Country allocation

The ICAO 24-bit address 71C507 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
ESR886 - 38 2026-07-12
ESR712 - 38 2026-07-05
ESR885 - 37 2026-07-12
ESR715 - 37 2026-07-06
ESR751 - 21 2026-06-29
ESR887 - 14 2026-07-07
ESR752 - 14 2026-06-29
ESR204 - 13 2026-07-13
ESR283 - 11 2026-07-13
ESR230 - 11 2026-07-13
ESR201 Eastar Jet 11 2026-05-26
ESR888 - 10 2026-07-07
ESR229 - 10 2026-07-07
ESR220 Eastar Jet 10 2026-05-26
ESR217 Eastar Jet 10 2026-05-26
ESR210 Eastar Jet 10 2026-05-26
ESR209 Eastar Jet 10 2026-05-26
ESR202 Eastar Jet 10 2026-05-25
ESR228 Eastar Jet 9 2026-05-26
ESR227 Eastar Jet 9 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ESR272 - Jul 14, 01:10 UTCJul 14, 01:45 UTC35m
2026-07-13 ESR271 - Jul 13, 23:05 UTCJul 13, 23:35 UTC30m
2026-07-13 ESR230 - Jul 13, 13:05 UTCJul 13, 13:45 UTC40m
2026-07-13 ESR283 - Jul 13, 11:00 UTCJul 13, 11:35 UTC35m
2026-07-13 ESR222 - Jul 13, 09:20 UTCJul 13, 10:00 UTC40m
2026-07-13 ESR221 - Jul 13, 06:55 UTCJul 13, 07:30 UTC35m
2026-07-13 ESR214 - Jul 13, 04:50 UTCJul 13, 05:31 UTC40m
2026-07-13 ESR281 - Jul 13, 02:35 UTCJul 13, 03:10 UTC35m
2026-07-13 ESR204 - Jul 13, 00:25 UTCJul 13, 01:15 UTC50m
2026-07-12 ESR886 - Jul 12, 19:35 UTCJul 12, 20:01 UTC25m
2026-07-12 ESR885 - Jul 12, 14:55 UTCJul 12, 15:35 UTC40m
2026-07-12 ESR277 - Jul 12, 11:15 UTCJul 12, 11:50 UTC35m
2026-07-12 ESR276 - Jul 12, 09:25 UTCJul 12, 10:01 UTC35m
2026-07-12 ESR275 - Jul 12, 07:10 UTCJul 12, 07:45 UTC35m
2026-07-12 ESR274 - Jul 12, 05:25 UTCJul 12, 06:05 UTC40m
2026-07-11 ESR277 - Jul 11, 12:05 UTCJul 11, 12:40 UTC35m
2026-07-11 ESR276 - Jul 11, 10:30 UTCJul 11, 11:05 UTC35m
2026-07-11 ESR275 - Jul 11, 06:50 UTCJul 11, 07:30 UTC40m
2026-07-11 ESR274 - Jul 11, 05:15 UTCJul 11, 05:50 UTC35m
2026-07-11 ESR273 - Jul 11, 02:50 UTCJul 11, 03:30 UTC40m
2026-07-11 ESR272 - Jul 11, 01:05 UTCJul 11, 01:45 UTC40m
2026-07-10 ESR271 - Jul 10, 22:50 UTCJul 10, 23:20 UTC30m
2026-07-10 ESR230 - Jul 10, 11:50 UTCJul 10, 12:35 UTC45m
2026-07-10 ESR283 - Jul 10, 09:45 UTCJul 10, 10:20 UTC35m
2026-07-10 ESR284 - Jul 10, 07:55 UTCJul 10, 08:40 UTC45m
2026-07-10 ESR219 - Jul 10, 05:55 UTCJul 10, 06:30 UTC35m
2026-07-10 ESR212 - Jul 10, 04:15 UTCJul 10, 05:00 UTC45m
2026-07-10 ESR211 - Jul 10, 02:05 UTCJul 10, 02:40 UTC35m
2026-07-10 ESR206 - Jul 10, 00:10 UTCJul 10, 00:55 UTC45m
2026-07-09 ESR205 - Jul 9, 22:00 UTCJul 9, 22:30 UTC30m
2026-07-09 ESR278 - Jul 9, 13:00 UTCJul 9, 13:40 UTC40m
2026-07-09 ESR277 - Jul 9, 10:45 UTCJul 9, 11:35 UTC50m
2026-07-09 ESR276 - Jul 9, 08:55 UTCJul 9, 09:40 UTC45m
2026-07-09 ESR275 - Jul 9, 07:00 UTCJul 9, 07:35 UTC35m
2026-07-09 ESR274 - Jul 9, 05:20 UTCJul 9, 06:05 UTC45m
2026-07-09 ESR273 - Jul 9, 03:15 UTCJul 9, 03:55 UTC40m
2026-07-09 ESR208 - Jul 9, 01:05 UTCJul 9, 01:55 UTC50m
2026-07-08 ESR711 - Jul 8, 23:05 UTCJul 8, 23:35 UTC30m
2026-07-08 ESR822 - Jul 8, 21:05 UTCJul 8, 21:35 UTC30m
2026-07-08 ESR821 - Jul 8, 15:30 UTCJul 8, 16:05 UTC35m
2026-07-08 ESR716 - Jul 8, 13:30 UTCJul 8, 14:00 UTC30m
2026-07-08 ESR233 - Jul 8, 11:25 UTCJul 8, 12:00 UTC35m
2026-07-08 ESR224 - Jul 8, 09:35 UTCJul 8, 10:25 UTC50m
2026-07-08 ESR223 - Jul 8, 07:25 UTCJul 8, 08:00 UTC35m
2026-07-08 ESR274 - Jul 8, 05:45 UTCJul 8, 06:25 UTC40m
2026-07-08 ESR273 - Jul 8, 03:40 UTCJul 8, 04:20 UTC40m
2026-07-08 ESR208 - Jul 8, 01:50 UTCJul 8, 02:35 UTC45m
2026-07-07 ESR207 - Jul 7, 23:35 UTCJul 8, 00:10 UTC35m
2026-07-07 ESR232 - Jul 7, 13:00 UTCJul 7, 13:45 UTC45m
2026-07-07 ESR229 - Jul 7, 09:45 UTCJul 7, 10:20 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 HL8507 page for operator, model, and routing details .

Mode-S 71C507 frequently asked

What is Mode-S code 71C507?
71C507 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8507.
Where is Mode-S 71C507 registered?
Mode-S code 71C507 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 71C507 broadcasting right now?
Mode-S 71C507 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C507, octal 34342407, decimal 7,456,007.
What flights does 71C507 operate?
Mode-S 71C507 has broadcast 20 distinct callsigns, including ESR886, ESR712, ESR885, ESR715, ESR751.