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sensors Mode-S transponder

71C555

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

Currently assigned to HL8555 · BOEING 737 MAX 8

Hex
71C555
Octal
34342525
Decimal
7,456,085
Country
KR
Tail
HL8555
Type
B38M
No current signal · last broadcast 4h ago
Flights observed
217
Distinct callsigns
20
Country
KR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 71C555.

Country allocation

The ICAO 24-bit address 71C555 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
JJA1107 Jeju Air 12 2026-05-26
JJA6102 Jeju Air 10 2026-05-28
JJA6101 Jeju Air 10 2026-05-28
JJA1802 Jeju Air 10 2026-05-29
JJA1108 Jeju Air 9 2026-05-26
JJA1801 Jeju Air 8 2026-05-03
JJA1106 Jeju Air 8 2026-05-27
JJA1105 Jeju Air 8 2026-05-27
JJA2661 Jeju Air 7 2026-05-20
JJA1307 Jeju Air 7 2026-05-05
JJA1302 Jeju Air 7 2026-05-29
JJA1301 Jeju Air 7 2026-05-28
JJA1154 Jeju Air 7 2026-05-21
JJA1153 Jeju Air 7 2026-05-21
JJA8501 Jeju Air 6 2026-05-26
JJA8401 Jeju Air 6 2026-05-26
JJA2662 Jeju Air 6 2026-05-21
JJA8502 Jeju Air 5 2026-05-26
JJA2504 Jeju Air 5 2026-05-03
JJA1308 Jeju Air 5 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JJA6014 HKG → ICN May 29, 17:05 UTCMay 29, 20:15 UTC3h 10m
2026-05-29 JJA6013 ICN → HKG May 29, 11:55 UTCMay 29, 15:05 UTC3h 10m
2026-05-29 JJA1802 OKA → ICN May 29, 04:45 UTCMay 29, 09:40 UTC4h 55m
2026-05-29 JJA1302 ICN → KIX May 29, 01:20 UTCMay 29, 02:45 UTC1h 25m
2026-05-28 JJA1301 KIX → ICN May 28, 22:15 UTCMay 28, 23:40 UTC1h 25m
2026-05-28 JJA2315 ICN → PQC May 28, 08:45 UTCMay 28, 20:40 UTC11h 55m
2026-05-28 JJA6102 TPE → ICN May 28, 04:10 UTCMay 28, 06:20 UTC2h 10m
2026-05-28 JJA6101 ICN → TPE May 28, 00:25 UTCMay 28, 02:35 UTC2h 10m
2026-05-27 JJA2114 CEB → ICN May 27, 12:15 UTCMay 27, 22:05 UTC9h 50m
2026-05-27 JJA1106 NRT → ICN May 27, 08:20 UTCMay 27, 10:15 UTC1h 55m
2026-05-27 JJA1105 NRT → ICN May 27, 04:45 UTCMay 27, 06:44 UTC2h 0m
2026-05-27 JJA8402 TAO → ICN May 27, 02:44 UTCMay 27, 03:04 UTC20m
2026-05-26 JJA8401 ICN → TAO May 26, 23:35 UTCMay 27, 00:04 UTC30m
2026-05-26 JJA1108 NRT → ICN May 26, 09:49 UTCMay 26, 11:50 UTC2h 0m
2026-05-26 JJA1107 NRT → ICN May 26, 06:20 UTCMay 26, 08:10 UTC1h 50m
2026-05-26 JJA8502 WEH → ICN May 26, 04:30 UTCMay 26, 04:50 UTC20m
2026-05-26 JJA8501 ICN → WEH May 26, 01:55 UTCMay 26, 02:04 UTC10m
2026-05-25 JJA6014 HKG → ICN May 25, 16:55 UTCMay 25, 19:59 UTC3h 5m
2026-05-25 JJA6013 ICN → HKG May 25, 12:10 UTCMay 25, 15:15 UTC3h 5m
2026-05-25 JJA1802 OKA → ICN May 25, 04:30 UTCMay 25, 10:05 UTC5h 35m
2026-05-25 JJA1302 ICN → KIX May 25, 02:10 UTCMay 25, 02:50 UTC40m
2026-05-24 JJA1301 KIX → ICN May 24, 23:10 UTCMay 24, 23:46 UTC36m
2026-05-24 JJA2316 PQC → ICN May 24, 20:05 UTCMay 24, 20:35 UTC30m
2026-05-24 JJA2315 ICN → PQC May 24, 08:40 UTCMay 24, 18:55 UTC10h 15m
2026-05-24 JJA6102 TPE → ICN May 24, 04:20 UTCMay 24, 06:25 UTC2h 5m
2026-05-24 JJA6101 ICN → TPE May 24, 00:25 UTCMay 24, 02:35 UTC2h 10m
2026-05-23 JJA1108 NRT → ICN May 23, 10:00 UTCMay 23, 12:05 UTC2h 5m
2026-05-23 JJA1107 NRT → ICN May 23, 06:30 UTCMay 23, 08:30 UTC2h 0m
2026-05-23 JJA1174 NRT → PUS May 23, 02:10 UTCMay 23, 04:10 UTC1h 59m
2026-05-22 JJA1173 PUS → NRT May 22, 22:25 UTCMay 23, 00:15 UTC1h 50m
2026-05-22 JJA1432 FUK → ICN May 22, 12:15 UTCMay 22, 13:10 UTC55m
2026-05-22 JJA1431 ICN → FUK May 22, 09:35 UTCMay 22, 10:10 UTC35m
2026-05-22 JJA1104 NRT → ICN May 22, 05:55 UTCMay 22, 07:55 UTC2h 0m
2026-05-21 JJA1153 NRT → PUS May 21, 20:00 UTCMay 22, 04:20 UTC8h 20m
2026-05-21 JJA2662 SIN → PUS May 21, 16:55 UTCMay 21, 17:05 UTC10m
2026-05-21 JJA1154 NRT → PUS May 21, 05:40 UTCMay 21, 11:35 UTC5h 55m
2026-05-20 JJA1153 NRT → PUS May 20, 19:55 UTCMay 21, 03:45 UTC7h 50m
2026-05-20 JJA2661 PUS → SIN May 20, 05:30 UTCMay 20, 14:30 UTC9h 0m
2026-05-19 JJA1153 NRT → PUS May 19, 19:55 UTCMay 20, 03:45 UTC7h 50m
2026-05-19 JJA2662 SIN → PUS May 19, 16:45 UTCMay 19, 16:55 UTC10m
2026-05-19 JJA1154 NRT → PUS May 19, 05:45 UTCMay 19, 14:15 UTC8h 30m
2026-05-18 JJA1153 NRT → PUS May 18, 19:55 UTCMay 19, 03:50 UTC7h 55m
2026-05-18 JJA2661 PUS → SIN May 18, 14:00 UTCMay 18, 14:20 UTC20m
2026-05-18 JJA1154 NRT → PUS May 18, 05:55 UTCMay 18, 11:15 UTC5h 20m
2026-05-18 JJA1103 NRT → ICN May 18, 01:50 UTCMay 18, 03:55 UTC2h 5m
2026-05-17 JJA2304 CXR → ICN May 17, 12:40 UTCMay 17, 23:15 UTC10h 35m
2026-05-17 JJA1204 NGO → ICN May 17, 09:15 UTCMay 17, 10:40 UTC1h 25m
2026-05-17 JJA1203 ICN → NGO May 17, 06:20 UTCMay 17, 07:40 UTC1h 20m
2026-05-17 JJA1174 NRT → PUS May 17, 02:15 UTCMay 17, 04:00 UTC1h 45m
2026-05-16 JJA1173 PUS → NRT May 16, 22:25 UTCMay 17, 00:35 UTC2h 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 HL8555 page for operator, model, and routing details .

Mode-S 71C555 frequently asked

What is Mode-S code 71C555?
71C555 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8555.
Where is Mode-S 71C555 registered?
Mode-S code 71C555 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 71C555 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C555, octal 34342525, decimal 7,456,085.
What flights does 71C555 operate?
Mode-S 71C555 has broadcast 20 distinct callsigns, including JJA1107, JJA6102, JJA6101, JJA1802, JJA1108.