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
Broadcasting now · callsign ESR951 · 22,000 ft
Flights observed
636
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:15 UTC

Current position

71C507 is currently broadcasting. Map zoomed to live position.

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 Eastar Jet 14 2026-07-17
ESR201 Eastar Jet 14 2026-07-20
ESR230 Eastar Jet 13 2026-07-22
ESR220 Eastar Jet 13 2026-07-21
ESR217 Eastar Jet 13 2026-07-21
ESR210 Eastar Jet 13 2026-07-21
ESR209 Eastar Jet 13 2026-07-21
ESR202 Eastar Jet 13 2026-07-20
ESR283 - 12 2026-07-18
ESR228 Eastar Jet 12 2026-07-21
ESR227 Eastar Jet 12 2026-07-21
ESR205 Eastar Jet 11 2026-07-21
ESR888 - 10 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR988 TPE → PUS Jul 26, 20:10 UTCJul 26, 21:10 UTC1h 0m
2026-07-26 ESR988 TPE → PUS Jul 26, 18:40 UTCJul 26, 19:00 UTC20m
2026-07-26 ESR987 PUS → TPE Jul 26, 14:00 UTCJul 26, 15:50 UTC1h 50m
2026-07-26 ESR944 FUK → PUS Jul 26, 08:10 UTCJul 26, 08:40 UTC30m
2026-07-26 ESR943 PUS → FUK Jul 26, 06:00 UTCJul 26, 06:20 UTC20m
2026-07-26 ESR914 KIX → PUS Jul 26, 02:55 UTCJul 26, 04:00 UTC1h 5m
2026-07-26 ESR913 PUS → KIX Jul 26, 00:05 UTCJul 26, 01:15 UTC1h 10m
2026-07-25 ESR988 TPE → PUS Jul 25, 20:15 UTCJul 25, 21:05 UTC50m
2026-07-25 ESR988 TPE → PUS Jul 25, 18:50 UTCJul 25, 19:05 UTC15m
2026-07-25 ESR987 PUS → TPE Jul 25, 15:15 UTCJul 25, 15:35 UTC20m
2026-07-25 ESR987 PUS → TPE Jul 25, 13:40 UTCJul 25, 14:00 UTC20m
2026-07-25 ESR916 KIX → PUS Jul 25, 07:25 UTCJul 25, 08:30 UTC1h 5m
2026-07-25 ESR915 PUS → KIX Jul 25, 04:35 UTCJul 25, 05:40 UTC1h 5m
2026-07-25 ESR942 FUK → PUS Jul 25, 02:10 UTCJul 25, 02:30 UTC20m
2026-07-25 ESR941 PUS → FUK Jul 25, 00:00 UTCJul 25, 00:20 UTC20m
2026-07-24 ESR942 FUK → PUS Jul 24, 10:55 UTCJul 24, 11:35 UTC40m
2026-07-24 ESR941 PUS → FUK Jul 24, 00:15 UTCJul 24, 00:45 UTC30m
2026-07-23 ESR982 PQC → PUS Jul 23, 21:05 UTCJul 23, 21:40 UTC35m
2026-07-23 ESR981 - Jul 23, 10:15 UTCJul 23, 19:55 UTC9h 40m
2026-07-23 ESR968 KMJ → PUS Jul 23, 05:55 UTCJul 23, 06:40 UTC45m
2026-07-23 ESR967 PUS → KMJ Jul 23, 03:35 UTCJul 23, 04:10 UTC35m
2026-07-23 ESR902 CJU → PUS Jul 23, 01:30 UTCJul 23, 01:50 UTC20m
2026-07-22 ESR271 GMP → CJU Jul 22, 22:55 UTCJul 22, 23:30 UTC35m
2026-07-22 ESR230 CJU → GMP Jul 22, 11:55 UTCJul 22, 12:35 UTC40m
2026-07-22 ESR212 CJU → GMP Jul 22, 04:20 UTCJul 22, 05:00 UTC40m
2026-07-22 ESR211 GMP → CJU Jul 22, 02:15 UTCJul 22, 02:50 UTC35m
2026-07-22 ESR206 CJU → GMP Jul 22, 00:15 UTCJul 22, 00:55 UTC40m
2026-07-21 ESR205 GMP → CJU Jul 21, 22:05 UTCJul 21, 22:40 UTC35m
2026-07-21 ESR228 CJU → GMP Jul 21, 11:10 UTCJul 21, 11:45 UTC35m
2026-07-21 ESR227 GMP → CJU Jul 21, 09:15 UTCJul 21, 09:50 UTC35m
2026-07-21 ESR220 CJU → GMP Jul 21, 07:35 UTCJul 21, 08:15 UTC40m
2026-07-21 ESR217 GMP → CJU Jul 21, 05:25 UTCJul 21, 06:00 UTC35m
2026-07-21 ESR210 CJU → GMP Jul 21, 03:20 UTCJul 21, 04:00 UTC40m
2026-07-21 ESR209 GMP → CJU Jul 21, 01:10 UTCJul 21, 01:45 UTC35m
2026-07-20 ESR202 CJU → GMP Jul 20, 23:25 UTCJul 21, 00:05 UTC39m
2026-07-20 ESR201 GMP → CJU Jul 20, 21:20 UTCJul 20, 21:55 UTC35m
2026-07-20 ESR228 CJU → GMP Jul 20, 11:15 UTCJul 20, 11:55 UTC40m
2026-07-20 ESR227 GMP → CJU Jul 20, 09:15 UTCJul 20, 09:45 UTC30m
2026-07-20 ESR220 CJU → GMP Jul 20, 07:10 UTCJul 20, 07:50 UTC40m
2026-07-20 ESR217 GMP → CJU Jul 20, 05:10 UTCJul 20, 05:40 UTC30m
2026-07-20 ESR210 CJU → GMP Jul 20, 03:25 UTCJul 20, 03:55 UTC30m
2026-07-20 ESR209 GMP → CJU Jul 20, 01:10 UTCJul 20, 01:45 UTC35m
2026-07-19 ESR202 CJU → GMP Jul 19, 23:30 UTCJul 20, 00:10 UTC40m
2026-07-19 ESR201 GMP → CJU Jul 19, 21:15 UTCJul 19, 21:50 UTC35m
2026-07-19 ESR228 CJU → GMP Jul 19, 11:05 UTCJul 19, 11:45 UTC40m
2026-07-19 ESR227 GMP → CJU Jul 19, 09:10 UTCJul 19, 09:45 UTC35m
2026-07-19 ESR220 CJU → GMP Jul 19, 07:15 UTCJul 19, 07:50 UTC35m
2026-07-19 ESR217 GMP → CJU Jul 19, 05:00 UTCJul 19, 05:35 UTC35m
2026-07-19 ESR210 CJU → GMP Jul 19, 03:15 UTCJul 19, 03:50 UTC35m
2026-07-19 ESR209 GMP → CJU Jul 19, 01:10 UTCJul 19, 01:45 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?
Yes. Mode-S 71C507 is currently airborne.
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.