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sensors Mode-S transponder

71C743

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

Currently assigned to HL8743 · AIRBUS A-320

Hex
71C743
Octal
34343503
Decimal
7,456,579
Country
KR
Tail
HL8743
Type
A320
No current signal · last broadcast Jul 26, 22:20 UTC
Flights observed
499
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 22:20 UTC

Last known position

Most recent position reported by Mode-S 71C743.

Country allocation

The ICAO 24-bit address 71C743 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
EOK321 Aero K 32 2026-07-23
EOK351 Aero K 31 2026-07-22
EOK531 Aero K 27 2026-07-26
EOK352 Aero K 27 2026-07-21
EOK322 Aero K 23 2026-07-23
EOK317 Aero K 22 2026-07-22
EOK318 Aero K 21 2026-07-21
EOK323 Aero K 20 2026-07-23
EOK393 Aero K 19 2026-07-24
EOK324 Aero K 19 2026-07-23
EOK394 Aero K 16 2026-07-23
EOK421 Aero K 15 2026-07-24
EOK422 - 14 2026-07-19
EOK511 - 13 2026-06-27
EOK532 Aero K 12 2026-07-22
EOK512 - 12 2026-06-27
EOK331 - 12 2026-07-13
EOK8143 - 10 2026-05-30
EOK8133 - 10 2026-05-30
EOK332 - 10 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EOK531 CJJ → DAD Jul 26, 12:30 UTCJul 26, 22:20 UTC9h 50m
2026-07-26 EOK355 CTS → CJJ Jul 26, 08:05 UTCJul 26, 10:15 UTC2h 10m
2026-07-26 EOK356 CJJ → CTS Jul 26, 04:35 UTCJul 26, 06:50 UTC2h 16m
2026-07-25 EOK531 CJJ → DAD Jul 25, 12:35 UTCJul 25, 22:10 UTC9h 35m
2026-07-25 EOK355 CTS → CJJ Jul 25, 08:05 UTCJul 25, 10:10 UTC2h 5m
2026-07-25 EOK356 CJJ → CTS Jul 25, 04:20 UTCJul 25, 06:35 UTC2h 15m
2026-07-25 EOK311 KIX → CJJ Jul 25, 02:05 UTCJul 25, 03:10 UTC1h 5m
2026-07-24 EOK312 CJJ → KIX Jul 24, 23:35 UTCJul 25, 00:50 UTC1h 15m
2026-07-24 EOK421 CJJ → UBN Jul 24, 12:45 UTCJul 24, 21:15 UTC8h 30m
2026-07-24 EOK355 CTS → CJJ Jul 24, 08:05 UTCJul 24, 10:15 UTC2h 10m
2026-07-24 EOK356 CJJ → CTS Jul 24, 04:35 UTCJul 24, 06:50 UTC2h 15m
2026-07-24 EOK393 OKA → CJJ Jul 24, 02:00 UTCJul 24, 02:30 UTC30m
2026-07-24 EOK393 OKA → CJJ Jul 24, 00:55 UTCJul 24, 01:10 UTC15m
2026-07-23 EOK394 CJJ → OKA Jul 23, 22:00 UTCJul 23, 23:35 UTC1h 35m
2026-07-23 EOK323 NRT → CJJ Jul 23, 10:45 UTCJul 23, 12:45 UTC2h 0m
2026-07-23 EOK324 CJJ → NRT Jul 23, 07:20 UTCJul 23, 09:15 UTC1h 55m
2026-07-23 EOK321 NRT → CJJ Jul 23, 04:20 UTCJul 23, 06:00 UTC1h 40m
2026-07-23 EOK322 CJJ → NRT Jul 23, 00:55 UTCJul 23, 02:45 UTC1h 50m
2026-07-22 EOK532 DAD → CJJ Jul 22, 13:00 UTCJul 22, 22:35 UTC9h 35m
2026-07-22 EOK317 KIX → CJJ Jul 22, 11:15 UTCJul 22, 11:35 UTC20m
2026-07-22 EOK351 CTS → CJJ Jul 22, 03:05 UTCJul 22, 05:20 UTC2h 15m
2026-07-21 EOK352 CJJ → CTS Jul 21, 23:35 UTCJul 22, 01:40 UTC2h 5m
2026-07-21 EOK8973 - Jul 21, 14:15 UTCJul 21, 22:00 UTC7h 45m
2026-07-21 EOK317 KIX → CJJ Jul 21, 10:10 UTCJul 21, 11:15 UTC1h 5m
2026-07-21 EOK318 CJJ → KIX Jul 21, 07:10 UTCJul 21, 08:30 UTC1h 20m
2026-07-21 EOK351 CTS → CJJ Jul 21, 03:10 UTCJul 21, 05:20 UTC2h 10m
2026-07-20 EOK352 CJJ → CTS Jul 20, 23:45 UTCJul 21, 01:55 UTC2h 10m
2026-07-20 EOK421 CJJ → UBN Jul 20, 12:50 UTCJul 20, 21:15 UTC8h 25m
2026-07-20 EOK3613 - Jul 20, 08:40 UTCJul 20, 10:25 UTC1h 45m
2026-07-20 EOK3623 - Jul 20, 04:30 UTCJul 20, 06:15 UTC1h 45m
2026-07-20 EOK393 OKA → CJJ Jul 20, 01:05 UTCJul 20, 02:40 UTC1h 35m
2026-07-19 EOK394 CJJ → OKA Jul 19, 22:20 UTCJul 20, 00:00 UTC1h 40m
2026-07-19 EOK422 - Jul 19, 20:30 UTCJul 19, 21:00 UTC30m
2026-07-19 EOK421 - Jul 19, 12:50 UTCJul 19, 14:35 UTC1h 45m
2026-07-14 EOK355 - Jul 14, 08:10 UTCJul 14, 10:20 UTC2h 10m
2026-07-14 EOK356 - Jul 14, 04:30 UTCJul 14, 06:55 UTC2h 25m
2026-07-13 EOK331 - Jul 13, 23:30 UTCJul 14, 00:15 UTC45m
2026-07-13 EOK332 - Jul 13, 21:40 UTCJul 13, 22:10 UTC30m
2026-07-13 EOK323 - Jul 13, 10:45 UTCJul 13, 12:30 UTC1h 45m
2026-07-13 EOK324 - Jul 13, 07:25 UTCJul 13, 09:30 UTC2h 5m
2026-07-13 EOK321 - Jul 13, 04:25 UTCJul 13, 06:10 UTC1h 45m
2026-07-13 EOK322 - Jul 13, 00:55 UTCJul 13, 02:55 UTC2h 0m
2026-07-12 EOK422 - Jul 12, 20:40 UTCJul 12, 21:05 UTC25m
2026-07-12 EOK421 - Jul 12, 12:50 UTCJul 12, 14:30 UTC1h 40m
2026-07-12 EOK385 - Jul 12, 06:55 UTCJul 12, 07:45 UTC50m
2026-07-12 EOK386 - Jul 12, 04:30 UTCJul 12, 05:20 UTC50m
2026-07-12 EOK393 - Jul 12, 01:20 UTCJul 12, 03:01 UTC1h 40m
2026-07-11 EOK394 - Jul 11, 23:30 UTCJul 11, 23:55 UTC25m
2026-07-11 EOK394 - Jul 11, 22:05 UTCJul 11, 22:55 UTC50m
2026-07-11 EOK393 - Jul 11, 14:05 UTCJul 11, 14:40 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 HL8743 page for operator, model, and routing details .

Mode-S 71C743 frequently asked

What is Mode-S code 71C743?
71C743 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8743.
Where is Mode-S 71C743 registered?
Mode-S code 71C743 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 71C743 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 71C743, octal 34343503, decimal 7,456,579.
What flights does 71C743 operate?
Mode-S 71C743 has broadcast 20 distinct callsigns, including EOK321, EOK351, EOK531, EOK352, EOK322.