Apparatus

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sensors Mode-S transponder

71C599

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

Currently assigned to HL8599 · BOEING 737 MAX 8

Hex
71C599
Octal
34342631
Decimal
7,456,153
Country
KR
Tail
HL8599
Type
B38M
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
483
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 71C599.

Country allocation

The ICAO 24-bit address 71C599 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
ESR602 Eastar Jet 20 2026-07-26
ESR861 Eastar Jet 19 2026-07-22
ESR603 Eastar Jet 19 2026-07-25
ESR601 Eastar Jet 19 2026-07-25
ESR612 Eastar Jet 18 2026-07-25
ESR604 Eastar Jet 18 2026-07-25
ESR626 Eastar Jet 17 2026-07-21
ESR614 Eastar Jet 17 2026-07-26
ESR613 Eastar Jet 17 2026-07-26
ESR611 Eastar Jet 17 2026-07-25
ESR625 Eastar Jet 16 2026-07-22
ESR818 - 14 2026-07-18
ESR817 Eastar Jet 14 2026-07-18
ESR862 - 13 2026-07-22
ESR646 - 11 2026-07-11
ESR645 - 11 2026-07-11
ESR607 - 11 2026-06-30
ESR606 - 11 2026-07-20
ESR562 Eastar Jet 11 2026-07-23
ESR518 - 11 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR864 - Jul 26, 18:30 UTCJul 26, 21:45 UTC3h 15m
2026-07-26 ESR863 ICN → HKG Jul 26, 13:15 UTCJul 26, 16:35 UTC3h 20m
2026-07-26 ESR614 KIX → ICN Jul 26, 09:15 UTCJul 26, 10:40 UTC1h 25m
2026-07-26 ESR613 ICN → KIX Jul 26, 06:30 UTCJul 26, 07:55 UTC1h 26m
2026-07-26 ESR602 NRT → ICN Jul 26, 02:45 UTCJul 26, 04:45 UTC2h 0m
2026-07-25 ESR601 ICN → NRT Jul 25, 23:10 UTCJul 26, 01:10 UTC2h 0m
2026-07-25 ESR604 NRT → ICN Jul 25, 11:00 UTCJul 25, 13:00 UTC2h 0m
2026-07-25 ESR603 ICN → NRT Jul 25, 07:35 UTCJul 25, 09:35 UTC2h 0m
2026-07-25 ESR612 KIX → ICN Jul 25, 03:30 UTCJul 25, 04:55 UTC1h 25m
2026-07-25 ESR611 ICN → KIX Jul 25, 00:25 UTCJul 25, 01:50 UTC1h 25m
2026-07-24 ESR604 NRT → ICN Jul 24, 11:05 UTCJul 24, 13:00 UTC1h 55m
2026-07-24 ESR603 ICN → NRT Jul 24, 07:35 UTCJul 24, 09:35 UTC2h 0m
2026-07-24 ESR612 KIX → ICN Jul 24, 03:35 UTCJul 24, 05:00 UTC1h 25m
2026-07-24 ESR611 ICN → KIX Jul 24, 00:40 UTCJul 24, 02:00 UTC1h 20m
2026-07-23 ESR562 CXR → ICN Jul 23, 12:30 UTCJul 23, 23:15 UTC10h 45m
2026-07-23 ESR614 KIX → ICN Jul 23, 09:05 UTCJul 23, 10:35 UTC1h 30m
2026-07-23 ESR613 ICN → KIX Jul 23, 06:35 UTCJul 23, 07:55 UTC1h 20m
2026-07-23 ESR602 NRT → ICN Jul 23, 02:55 UTCJul 23, 04:55 UTC2h 0m
2026-07-22 ESR601 ICN → NRT Jul 22, 23:20 UTCJul 23, 01:20 UTC2h 0m
2026-07-22 ESR862 - Jul 22, 17:15 UTCJul 22, 20:30 UTC3h 15m
2026-07-22 ESR861 ICN → HKG Jul 22, 12:40 UTCJul 22, 15:50 UTC3h 10m
2026-07-22 ESR625 ICN → CTS Jul 22, 00:45 UTCJul 22, 03:05 UTC2h 20m
2026-07-21 ESR581 ICN → ICN Jul 21, 11:00 UTCJul 21, 23:15 UTC12h 15m
2026-07-21 ESR626 CTS → ICN Jul 21, 04:55 UTCJul 21, 07:25 UTC2h 30m
2026-07-21 ESR625 ICN → CTS Jul 21, 00:40 UTCJul 21, 02:55 UTC2h 15m
2026-07-20 ESR582 PQC → ICN Jul 20, 11:05 UTCJul 20, 23:15 UTC12h 10m
2026-07-20 ESR820 - Jul 20, 09:05 UTCJul 20, 09:30 UTC25m
2026-07-20 ESR819 - Jul 20, 06:05 UTCJul 20, 06:30 UTC25m
2026-07-20 ESR606 NRT → ICN Jul 20, 02:40 UTCJul 20, 04:35 UTC1h 55m
2026-07-19 ESR605 ICN → NRT Jul 19, 22:45 UTCJul 20, 00:40 UTC1h 55m
2026-07-19 ESR650 FUK → ICN Jul 19, 11:55 UTCJul 19, 12:55 UTC1h 0m
2026-07-19 ESR649 - Jul 19, 09:35 UTCJul 19, 10:25 UTC50m
2026-07-19 ESR648 - Jul 19, 06:10 UTCJul 19, 07:00 UTC50m
2026-07-19 ESR647 - Jul 19, 03:40 UTCJul 19, 04:20 UTC40m
2026-07-18 ESR593 ICN → ICN Jul 18, 13:15 UTCJul 19, 00:30 UTC11h 15m
2026-07-18 ESR624 - Jul 18, 09:10 UTCJul 18, 11:35 UTC2h 25m
2026-07-18 ESR623 - Jul 18, 05:00 UTCJul 18, 07:30 UTC2h 30m
2026-07-18 ESR818 - Jul 18, 03:05 UTCJul 18, 03:30 UTC25m
2026-07-18 ESR817 ICN → YNT Jul 18, 00:15 UTCJul 18, 00:35 UTC20m
2026-07-17 ESR604 NRT → ICN Jul 17, 10:10 UTCJul 17, 12:10 UTC2h 0m
2026-07-17 ESR603 ICN → NRT Jul 17, 06:40 UTCJul 17, 08:40 UTC2h 0m
2026-07-17 ESR612 - Jul 17, 03:25 UTCJul 17, 04:49 UTC1h 25m
2026-07-17 ESR611 ICN → KIX Jul 17, 00:35 UTCJul 17, 01:55 UTC1h 20m
2026-07-16 ESR562 ICN → ICN Jul 16, 12:55 UTCJul 16, 23:10 UTC10h 15m
2026-07-16 ESR614 KIX → ICN Jul 16, 09:20 UTCJul 16, 10:35 UTC1h 15m
2026-07-16 ESR613 - Jul 16, 06:30 UTCJul 16, 08:00 UTC1h 30m
2026-07-16 ESR602 NRT → ICN Jul 16, 02:45 UTCJul 16, 04:40 UTC1h 55m
2026-07-15 ESR601 ICN → NRT Jul 15, 23:15 UTCJul 16, 01:05 UTC1h 50m
2026-07-15 ESR862 HKG → ICN Jul 15, 16:40 UTCJul 15, 19:55 UTC3h 15m
2026-07-15 ESR861 ICN → HKG Jul 15, 11:45 UTCJul 15, 14:55 UTC3h 10m

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 HL8599 page for operator, model, and routing details .

Mode-S 71C599 frequently asked

What is Mode-S code 71C599?
71C599 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8599.
Where is Mode-S 71C599 registered?
Mode-S code 71C599 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 71C599 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C599, octal 34342631, decimal 7,456,153.
What flights does 71C599 operate?
Mode-S 71C599 has broadcast 20 distinct callsigns, including ESR602, ESR861, ESR603, ESR601, ESR612.