Apparatus

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sensors Mode-S transponder

71C552

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

Currently assigned to HL8552 · BOEING 737 MAX 8

Hex
71C552
Octal
34342522
Decimal
7,456,082
Country
KR
Tail
HL8552
Type
B38M
No current signal · last broadcast 14h ago
Flights observed
180
Distinct callsigns
14
Country
KR
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 71C552.

Country allocation

The ICAO 24-bit address 71C552 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 14 distinct

Callsign Airline Flights Last seen
JJA5304 Jeju Air 29 2026-05-28
JJA1306 Jeju Air 24 2026-05-25
JJA1201 Jeju Air 24 2026-05-28
JJA1202 Jeju Air 23 2026-05-28
JJA1305 Jeju Air 21 2026-05-25
JJA2623 Jeju Air 18 2026-05-24
JJA2624 Jeju Air 17 2026-05-24
JJA5303 Jeju Air 14 2026-05-27
JJA2211 Jeju Air 3 2026-05-29
JJA2212 Jeju Air 2 2026-05-19
JJA1474 - 1 2026-04-16
JJA1473 - 1 2026-04-15
JJA1308 Jeju Air 1 2026-05-18
JJA1307 Jeju Air 1 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JJA2211 ICN → DAD May 29, 00:40 UTCMay 29, 10:40 UTC10h 0m
2026-05-28 JJA5304 DPS → ICN May 28, 07:05 UTCMay 28, 21:40 UTC14h 35m
2026-05-28 JJA1202 NGO → ICN May 28, 03:45 UTCMay 28, 05:15 UTC1h 30m
2026-05-28 JJA1201 ICN → NGO May 28, 00:40 UTCMay 28, 02:00 UTC1h 20m
2026-05-27 JJA5304 DPS → ICN May 27, 07:05 UTCMay 27, 21:50 UTC14h 45m
2026-05-27 JJA5303 ICN → DPS May 27, 06:55 UTCMay 27, 07:00 UTC5m
2026-05-27 JJA1202 NGO → ICN May 27, 03:50 UTCMay 27, 05:19 UTC1h 30m
2026-05-27 JJA1201 ICN → NGO May 27, 00:55 UTCMay 27, 02:14 UTC1h 20m
2026-05-26 JJA2211 ICN → DAD May 26, 00:35 UTCMay 26, 10:50 UTC10h 15m
2026-05-25 JJA1306 KIX → ICN May 25, 04:40 UTCMay 25, 06:05 UTC1h 25m
2026-05-25 JJA1305 ICN → KIX May 25, 02:05 UTCMay 25, 03:35 UTC1h 30m
2026-05-24 JJA2624 SIN → ICN May 24, 23:00 UTCMay 24, 23:15 UTC15m
2026-05-24 JJA2624 SIN → ICN May 24, 20:20 UTCMay 24, 21:30 UTC1h 10m
2026-05-24 JJA2623 ICN → SIN May 24, 14:55 UTCMay 24, 15:05 UTC10m
2026-05-24 JJA2623 ICN → SIN May 24, 09:20 UTCMay 24, 12:00 UTC2h 40m
2026-05-24 JJA1306 KIX → ICN May 24, 04:50 UTCMay 24, 06:10 UTC1h 20m
2026-05-24 JJA1305 ICN → KIX May 24, 02:00 UTCMay 24, 03:20 UTC1h 20m
2026-05-23 JJA2624 SIN → ICN May 23, 20:15 UTCMay 23, 23:10 UTC2h 55m
2026-05-23 JJA2623 ICN → SIN May 23, 09:30 UTCMay 23, 15:20 UTC5h 50m
2026-05-23 JJA1306 KIX → ICN May 23, 04:40 UTCMay 23, 06:10 UTC1h 30m
2026-05-23 JJA1305 ICN → KIX May 23, 02:05 UTCMay 23, 03:30 UTC1h 24m
2026-05-22 JJA2211 ICN → DAD May 22, 00:35 UTCMay 22, 10:45 UTC10h 10m
2026-05-21 JJA5304 DPS → ICN May 21, 07:05 UTCMay 21, 22:05 UTC15h 0m
2026-05-21 JJA1202 NGO → ICN May 21, 03:45 UTCMay 21, 05:30 UTC1h 45m
2026-05-21 JJA1201 ICN → NGO May 21, 00:45 UTCMay 21, 02:00 UTC1h 15m
2026-05-20 JJA5304 DPS → ICN May 20, 07:00 UTCMay 20, 22:00 UTC15h 0m
2026-05-20 JJA1202 NGO → ICN May 20, 03:40 UTCMay 20, 05:15 UTC1h 36m
2026-05-20 JJA1201 ICN → NGO May 20, 00:45 UTCMay 20, 02:05 UTC1h 20m
2026-05-19 JJA2212 DAD → ICN May 19, 00:40 UTCMay 19, 11:00 UTC10h 20m
2026-05-18 JJA1308 KIX → ICN May 18, 11:05 UTCMay 18, 12:20 UTC1h 15m
2026-05-18 JJA1307 ICN → KIX May 18, 08:10 UTCMay 18, 09:45 UTC1h 35m
2026-05-18 JJA1306 KIX → ICN May 18, 04:40 UTCMay 18, 05:55 UTC1h 15m
2026-05-18 JJA1305 ICN → KIX May 18, 02:05 UTCMay 18, 03:25 UTC1h 20m
2026-05-17 JJA2624 SIN → ICN May 17, 20:25 UTCMay 17, 23:25 UTC3h 0m
2026-05-17 JJA2623 ICN → SIN May 17, 09:25 UTCMay 17, 15:15 UTC5h 50m
2026-05-17 JJA1306 KIX → ICN May 17, 04:40 UTCMay 17, 06:00 UTC1h 20m
2026-05-17 JJA1305 ICN → KIX May 17, 02:00 UTCMay 17, 03:25 UTC1h 25m
2026-05-16 JJA2624 SIN → ICN May 16, 20:20 UTCMay 16, 23:20 UTC3h 0m
2026-05-16 JJA2624 SIN → ICN May 16, 17:05 UTCMay 16, 17:15 UTC10m
2026-05-16 JJA2623 ICN → SIN May 16, 15:05 UTCMay 16, 15:16 UTC10m
2026-05-16 JJA2623 ICN → SIN May 16, 09:35 UTCMay 16, 12:21 UTC2h 45m
2026-05-16 JJA1306 KIX → ICN May 16, 04:40 UTCMay 16, 06:06 UTC1h 26m
2026-05-16 JJA1305 ICN → KIX May 16, 01:55 UTCMay 16, 03:20 UTC1h 25m
2026-05-15 JJA5304 DPS → ICN May 15, 07:00 UTCMay 15, 22:05 UTC15h 4m
2026-05-15 - ICN → ICN May 15, 06:45 UTCMay 15, 06:50 UTC5m
2026-05-15 JJA1202 NGO → ICN May 15, 03:50 UTCMay 15, 05:05 UTC1h 15m
2026-05-15 JJA1201 ICN → NGO May 15, 00:50 UTCMay 15, 02:20 UTC1h 30m
2026-05-14 JJA5304 DPS → ICN May 14, 06:50 UTCMay 14, 22:05 UTC15h 15m
2026-05-14 JJA1202 NGO → ICN May 14, 03:40 UTCMay 14, 05:00 UTC1h 20m
2026-05-14 JJA1201 ICN → NGO May 14, 00:45 UTCMay 14, 02:15 UTC1h 30m

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 HL8552 page for operator, model, and routing details .

Mode-S 71C552 frequently asked

What is Mode-S code 71C552?
71C552 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8552.
Where is Mode-S 71C552 registered?
Mode-S code 71C552 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 71C552 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C552, octal 34342522, decimal 7,456,082.
What flights does 71C552 operate?
Mode-S 71C552 has broadcast 14 distinct callsigns, including JJA5304, JJA1306, JJA1201, JJA1202, JJA1305.