Apparatus

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sensors Mode-S transponder

71C544

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

Currently assigned to HL8544 · BOEING 737 MAX 8

Hex
71C544
Octal
34342504
Decimal
7,456,068
Country
KR
Tail
HL8544
Type
B38M
No current signal · last broadcast Jul 26, 22:20 UTC
Flights observed
644
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 22:20 UTC

Last known position

Most recent position reported by Mode-S 71C544.

Country allocation

The ICAO 24-bit address 71C544 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
ESR782 Eastar Jet 26 2026-07-17
ESR781 - 22 2026-07-17
ESR233 - 21 2026-07-17
ESR716 - 20 2026-07-17
ESR711 - 20 2026-07-17
ESR224 - 19 2026-07-17
ESR223 - 19 2026-07-17
ESR216 - 15 2026-07-17
ESR213 - 15 2026-07-17
ESR282 - 13 2026-07-18
ESR208 - 12 2026-07-17
ESR536 Eastar Jet 11 2026-07-24
ESR281 - 11 2026-07-18
ESR214 - 11 2026-07-18
ESR205 - 11 2026-07-08
ESR222 - 10 2026-07-18
ESR221 - 10 2026-07-18
ESR632 Eastar Jet 9 2026-07-25
ESR207 - 9 2026-07-15
ESR206 - 9 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ESR535 ICN → MDC Jul 26, 12:05 UTCJul 26, 22:20 UTC10h 15m
2026-07-26 ESR854 CGO → ICN Jul 26, 10:00 UTCJul 26, 10:30 UTC30m
2026-07-26 ESR853 ICN → CGO Jul 26, 05:20 UTCJul 26, 05:45 UTC25m
2026-07-26 ESR818 YNT → ICN Jul 26, 03:10 UTCJul 26, 03:35 UTC25m
2026-07-26 ESR817 ICN → YNT Jul 26, 00:15 UTCJul 26, 00:35 UTC20m
2026-07-25 ESR518 CNX → ICN Jul 25, 16:55 UTCJul 25, 21:50 UTC4h 55m
2026-07-25 ESR517 ICN → CNX Jul 25, 10:00 UTCJul 25, 15:00 UTC5h 0m
2026-07-25 ESR632 OKA → ICN Jul 25, 07:20 UTCJul 25, 08:00 UTC40m
2026-07-25 ESR632 OKA → ICN Jul 25, 06:15 UTCJul 25, 06:25 UTC10m
2026-07-25 ESR631 ICN → OKA Jul 25, 02:50 UTCJul 25, 04:30 UTC1h 40m
2026-07-24 ESR536 MDC → ICN Jul 24, 11:50 UTCJul 24, 23:45 UTC11h 55m
2026-07-24 ESR632 OKA → ICN Jul 24, 06:20 UTCJul 24, 08:10 UTC1h 50m
2026-07-24 ESR631 ICN → OKA Jul 24, 02:55 UTCJul 24, 04:45 UTC1h 50m
2026-07-23 ESR536 MDC → ICN Jul 23, 12:15 UTCJul 24, 00:30 UTC12h 15m
2026-07-23 ESR8262 - Jul 23, 10:10 UTCJul 23, 10:30 UTC20m
2026-07-23 ESR8262 - Jul 23, 08:50 UTCJul 23, 09:15 UTC25m
2026-07-23 ESR8261 ICN → DAT Jul 23, 06:30 UTCJul 23, 07:10 UTC40m
2026-07-23 ESR8261 ICN → DAT Jul 23, 05:15 UTCJul 23, 05:40 UTC25m
2026-07-22 ESR536 MDC → ICN Jul 22, 11:55 UTCJul 23, 00:00 UTC12h 5m
2026-07-22 ESR647 ICN → FUK Jul 22, 03:55 UTCJul 22, 04:55 UTC1h 0m
2026-07-21 ESR604 NRT → ICN Jul 21, 10:50 UTCJul 21, 12:55 UTC2h 5m
2026-07-21 ESR603 ICN → NRT Jul 21, 07:15 UTCJul 21, 09:15 UTC2h 0m
2026-07-21 ESR612 KIX → ICN Jul 21, 04:30 UTCJul 21, 05:50 UTC1h 20m
2026-07-21 ESR611 ICN → KIX Jul 21, 00:30 UTCJul 21, 02:00 UTC1h 30m
2026-07-20 ESR5944 - Jul 20, 02:35 UTCJul 20, 14:15 UTC11h 40m
2026-07-19 ESR712 CJU → CJJ Jul 19, 23:20 UTCJul 19, 23:50 UTC30m
2026-07-19 ESR886 - Jul 19, 19:15 UTCJul 19, 19:45 UTC30m
2026-07-19 ESR885 - Jul 19, 15:00 UTCJul 19, 15:30 UTC30m
2026-07-19 ESR715 - Jul 19, 11:50 UTCJul 19, 12:20 UTC30m
2026-07-19 ESR714 CJU → CJJ Jul 19, 10:15 UTCJul 19, 10:45 UTC30m
2026-07-19 ESR713 CJJ → CJU Jul 19, 08:15 UTCJul 19, 08:40 UTC25m
2026-07-18 ESR712 CJU → CJJ Jul 18, 23:20 UTCJul 18, 23:50 UTC30m
2026-07-18 ESR886 - Jul 18, 20:00 UTCJul 18, 20:10 UTC10m
2026-07-18 ESR885 - Jul 18, 15:05 UTCJul 18, 15:20 UTC15m
2026-07-18 ESR277 - Jul 18, 10:45 UTCJul 18, 11:20 UTC35m
2026-07-18 ESR222 - Jul 18, 09:10 UTCJul 18, 09:45 UTC35m
2026-07-18 ESR221 - Jul 18, 06:55 UTCJul 18, 07:25 UTC30m
2026-07-18 ESR214 - Jul 18, 05:00 UTCJul 18, 05:45 UTC45m
2026-07-18 ESR281 - Jul 18, 02:45 UTCJul 18, 03:15 UTC31m
2026-07-18 ESR282 - Jul 18, 01:00 UTCJul 18, 01:39 UTC40m
2026-07-17 ESR711 - Jul 17, 22:55 UTCJul 17, 23:20 UTC25m
2026-07-17 ESR782 TPE → CJJ Jul 17, 20:44 UTCJul 17, 21:15 UTC30m
2026-07-17 ESR782 TPE → CJJ Jul 17, 19:09 UTCJul 17, 19:30 UTC20m
2026-07-17 ESR781 - Jul 17, 15:15 UTCJul 17, 17:09 UTC1h 55m
2026-07-17 ESR716 - Jul 17, 13:15 UTCJul 17, 13:45 UTC30m
2026-07-17 ESR233 - Jul 17, 10:50 UTCJul 17, 11:30 UTC40m
2026-07-17 ESR224 - Jul 17, 08:54 UTCJul 17, 09:30 UTC35m
2026-07-17 ESR223 - Jul 17, 06:50 UTCJul 17, 07:20 UTC30m
2026-07-17 ESR216 - Jul 17, 05:10 UTCJul 17, 05:45 UTC35m
2026-07-17 ESR213 - Jul 17, 03:05 UTCJul 17, 03:39 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 HL8544 page for operator, model, and routing details .

Mode-S 71C544 frequently asked

What is Mode-S code 71C544?
71C544 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8544.
Where is Mode-S 71C544 registered?
Mode-S code 71C544 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 71C544 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C544, octal 34342504, decimal 7,456,068.
What flights does 71C544 operate?
Mode-S 71C544 has broadcast 20 distinct callsigns, including ESR782, ESR781, ESR233, ESR716, ESR711.