Apparatus

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sensors Mode-S transponder

71C374

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

Currently assigned to HL8374 · BOEING 737-800

Hex
71C374
Octal
34341564
Decimal
7,455,604
Country
KR
Tail
HL8374
Type
B738
No current signal · last broadcast Jul 26, 18:55 UTC
Flights observed
351
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 18:55 UTC

Last known position

Most recent position reported by Mode-S 71C374.

Country allocation

The ICAO 24-bit address 71C374 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
ESR987 Eastar Jet 12 2026-05-15
ESR952 Eastar Jet 12 2026-05-16
ESR951 Eastar Jet 12 2026-05-16
ESR988 Eastar Jet 10 2026-05-15
ESR861 Eastar Jet 10 2026-07-23
ESR625 Eastar Jet 10 2026-07-19
ESR626 Eastar Jet 9 2026-07-19
ESR915 Eastar Jet 7 2026-05-14
ESR862 Eastar Jet 7 2026-07-23
ESR672 Eastar Jet 6 2026-07-23
ESR671 Eastar Jet 6 2026-07-23
ESR646 Eastar Jet 6 2026-07-24
ESR645 Eastar Jet 6 2026-07-24
ESR916 Eastar Jet 5 2026-05-14
ESR882 - 5 2026-07-17
ESR881 Eastar Jet 5 2026-07-16
ESR818 Eastar Jet 5 2026-07-23
ESR817 Eastar Jet 5 2026-07-23
ESR228 Eastar Jet 5 2026-06-15
ESR227 - 5 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR872 PVG → ICN Jul 26, 14:30 UTCJul 26, 18:55 UTC4h 25m
2026-07-26 ESR604 NRT → ICN Jul 26, 11:10 UTCJul 26, 13:10 UTC2h 0m
2026-07-26 ESR603 ICN → NRT Jul 26, 07:20 UTCJul 26, 09:25 UTC2h 5m
2026-07-26 ESR612 KIX → ICN Jul 26, 03:45 UTCJul 26, 05:10 UTC1h 25m
2026-07-26 ESR611 ICN → KIX Jul 26, 01:20 UTCJul 26, 02:45 UTC1h 25m
2026-07-25 ESR562 CXR → ICN Jul 25, 12:35 UTCJul 25, 23:50 UTC11h 15m
2026-07-25 ESR614 KIX → ICN Jul 25, 09:20 UTCJul 25, 10:50 UTC1h 30m
2026-07-25 ESR613 ICN → KIX Jul 25, 06:30 UTCJul 25, 07:55 UTC1h 25m
2026-07-25 ESR606 NRT → ICN Jul 25, 02:00 UTCJul 25, 04:00 UTC2h 0m
2026-07-24 ESR605 ICN → NRT Jul 24, 22:35 UTCJul 25, 00:30 UTC1h 55m
2026-07-24 ESR872 PVG → ICN Jul 24, 13:55 UTCJul 24, 18:50 UTC4h 55m
2026-07-24 ESR624 CTS → ICN Jul 24, 09:00 UTCJul 24, 11:25 UTC2h 25m
2026-07-24 ESR623 ICN → CTS Jul 24, 05:05 UTCJul 24, 07:20 UTC2h 15m
2026-07-24 ESR646 FUK → ICN Jul 24, 02:55 UTCJul 24, 03:50 UTC55m
2026-07-24 ESR645 ICN → FUK Jul 24, 00:00 UTCJul 24, 00:55 UTC55m
2026-07-23 ESR862 HKG → ICN Jul 23, 16:30 UTCJul 23, 19:35 UTC3h 5m
2026-07-23 ESR861 ICN → HKG Jul 23, 12:00 UTCJul 23, 15:10 UTC3h 10m
2026-07-23 ESR672 TKS → ICN Jul 23, 07:55 UTCJul 23, 09:20 UTC1h 25m
2026-07-23 ESR671 ICN → TKS Jul 23, 05:20 UTCJul 23, 06:45 UTC1h 25m
2026-07-23 ESR818 YNT → ICN Jul 23, 03:40 UTCJul 23, 04:00 UTC20m
2026-07-23 ESR817 ICN → YNT Jul 23, 00:35 UTCJul 23, 00:50 UTC15m
2026-07-22 ESR594 DAD → ICN Jul 22, 12:10 UTCJul 22, 22:00 UTC9h 50m
2026-07-22 ESR818 YNT → ICN Jul 22, 03:25 UTCJul 22, 03:45 UTC20m
2026-07-22 ESR817 ICN → YNT Jul 22, 00:20 UTCJul 22, 00:40 UTC20m
2026-07-21 ESR862 HKG → ICN Jul 21, 16:25 UTCJul 21, 19:30 UTC3h 5m
2026-07-21 ESR861 ICN → HKG Jul 21, 11:40 UTCJul 21, 14:50 UTC3h 10m
2026-07-21 ESR820 - Jul 21, 09:05 UTCJul 21, 09:30 UTC25m
2026-07-21 ESR819 - Jul 21, 06:15 UTCJul 21, 06:35 UTC20m
2026-07-21 ESR606 NRT → ICN Jul 21, 02:45 UTCJul 21, 04:40 UTC1h 55m
2026-07-20 ESR605 ICN → NRT Jul 20, 22:50 UTCJul 21, 00:50 UTC2h 0m
2026-07-20 ESR862 HKG → ICN Jul 20, 16:45 UTCJul 20, 19:55 UTC3h 10m
2026-07-20 ESR861 - Jul 20, 12:00 UTCJul 20, 15:00 UTC3h 0m
2026-07-20 ESR854 CGO → ICN Jul 20, 10:15 UTCJul 20, 10:40 UTC25m
2026-07-20 ESR853 ICN → CGO Jul 20, 05:35 UTCJul 20, 06:00 UTC25m
2026-07-20 ESR646 FUK → ICN Jul 20, 02:45 UTCJul 20, 03:50 UTC1h 5m
2026-07-20 ESR645 ICN → FUK Jul 20, 00:00 UTCJul 20, 00:45 UTC45m
2026-07-19 ESR518 - Jul 19, 17:00 UTCJul 19, 22:00 UTC5h 0m
2026-07-19 ESR517 - Jul 19, 09:50 UTCJul 19, 14:40 UTC4h 50m
2026-07-19 ESR626 CTS → ICN Jul 19, 05:05 UTCJul 19, 07:30 UTC2h 25m
2026-07-19 ESR625 ICN → CTS Jul 19, 01:05 UTCJul 19, 03:25 UTC2h 20m
2026-07-18 ESR582 PQC → ICN Jul 18, 10:50 UTCJul 18, 23:30 UTC12h 40m
2026-07-18 ESR672 - Jul 18, 07:40 UTCJul 18, 09:00 UTC1h 20m
2026-07-18 ESR671 - Jul 18, 04:50 UTCJul 18, 06:10 UTC1h 20m
2026-07-17 ESR594 ICN → ICN Jul 17, 13:15 UTCJul 17, 23:14 UTC10h 0m
2026-07-17 ESR614 KIX → ICN Jul 17, 09:20 UTCJul 17, 10:35 UTC1h 15m
2026-07-17 ESR613 - Jul 17, 06:35 UTCJul 17, 08:04 UTC1h 30m
2026-07-17 ESR882 TPE → ICN Jul 17, 02:45 UTCJul 17, 04:54 UTC2h 10m
2026-07-16 ESR881 ICN → TPE Jul 16, 22:59 UTCJul 17, 01:00 UTC2h 0m
2026-07-16 ESR650 - Jul 16, 12:00 UTCJul 16, 12:55 UTC55m
2026-07-16 ESR649 - Jul 16, 09:35 UTCJul 16, 10:20 UTC45m

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 HL8374 page for operator, model, and routing details .

Mode-S 71C374 frequently asked

What is Mode-S code 71C374?
71C374 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8374.
Where is Mode-S 71C374 registered?
Mode-S code 71C374 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 71C374 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C374, octal 34341564, decimal 7,455,604.
What flights does 71C374 operate?
Mode-S 71C374 has broadcast 20 distinct callsigns, including ESR987, ESR952, ESR951, ESR988, ESR861.