Apparatus

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sensors Mode-S transponder

71C553

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

Currently assigned to HL8553 · BOEING 737 MAX 8

Hex
71C553
Octal
34342523
Decimal
7,456,083
Country
KR
Tail
HL8553
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
149
Distinct callsigns
9
Country
KR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 71C553.

Country allocation

The ICAO 24-bit address 71C553 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 9 distinct

Callsign Airline Flights Last seen
JJA1201 Jeju Air 31 2026-05-30
JJA5304 Jeju Air 28 2026-05-29
JJA1202 Jeju Air 27 2026-05-30
JJA1306 Jeju Air 18 2026-05-28
JJA1305 Jeju Air 17 2026-05-28
JJA2623 Jeju Air 12 2026-05-27
JJA2624 Jeju Air 11 2026-05-27
JJA5303 Jeju Air 3 2026-04-18
JJA2211 Jeju Air 2 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 JJA1202 NGO → ICN May 30, 03:50 UTCMay 30, 04:40 UTC50m
2026-05-30 JJA1201 ICN → NGO May 30, 00:50 UTCMay 30, 02:00 UTC1h 10m
2026-05-29 JJA5304 DPS → ICN May 29, 06:50 UTCMay 29, 21:40 UTC14h 50m
2026-05-29 JJA1202 NGO → ICN May 29, 03:50 UTCMay 29, 05:25 UTC1h 35m
2026-05-29 JJA1201 ICN → NGO May 29, 00:45 UTCMay 29, 02:00 UTC1h 15m
2026-05-28 JJA1306 KIX → ICN May 28, 04:45 UTCMay 28, 06:10 UTC1h 25m
2026-05-28 JJA1305 ICN → KIX May 28, 02:05 UTCMay 28, 03:20 UTC1h 15m
2026-05-27 JJA2624 SIN → ICN May 27, 20:05 UTCMay 27, 23:00 UTC2h 55m
2026-05-27 JJA2623 ICN → SIN May 27, 09:25 UTCMay 27, 15:00 UTC5h 35m
2026-05-27 JJA1306 KIX → ICN May 27, 04:45 UTCMay 27, 06:09 UTC1h 25m
2026-05-27 JJA1305 ICN → KIX May 27, 02:09 UTCMay 27, 03:29 UTC1h 20m
2026-05-26 JJA5304 DPS → ICN May 26, 06:54 UTCMay 26, 21:44 UTC14h 50m
2026-05-26 JJA1202 NGO → ICN May 26, 03:45 UTCMay 26, 05:10 UTC1h 25m
2026-05-26 JJA1201 ICN → NGO May 26, 00:54 UTCMay 26, 02:15 UTC1h 20m
2026-05-25 JJA5304 DPS → ICN May 25, 06:55 UTCMay 25, 21:35 UTC14h 40m
2026-05-25 JJA1202 NGO → ICN May 25, 03:45 UTCMay 25, 05:10 UTC1h 25m
2026-05-24 JJA5304 DPS → ICN May 24, 06:55 UTCMay 24, 21:50 UTC14h 55m
2026-05-24 JJA1202 NGO → ICN May 24, 03:35 UTCMay 24, 05:05 UTC1h 30m
2026-05-24 JJA1201 ICN → NGO May 24, 00:40 UTCMay 24, 01:55 UTC1h 15m
2026-05-23 JJA5304 DPS → ICN May 23, 07:15 UTCMay 23, 22:10 UTC14h 56m
2026-05-23 JJA1202 NGO → ICN May 23, 03:45 UTCMay 23, 05:45 UTC2h 0m
2026-05-23 JJA1201 ICN → NGO May 23, 00:40 UTCMay 23, 02:00 UTC1h 20m
2026-05-23 JJA1201 ICN → NGO May 23, 00:25 UTCMay 23, 00:30 UTC5m
2026-05-22 JJA5304 DPS → ICN May 22, 07:05 UTCMay 22, 21:55 UTC14h 49m
2026-05-22 JJA1202 NGO → ICN May 22, 03:45 UTCMay 22, 05:10 UTC1h 25m
2026-05-22 JJA1201 ICN → NGO May 22, 00:50 UTCMay 22, 02:05 UTC1h 15m
2026-05-21 JJA1306 KIX → ICN May 21, 04:40 UTCMay 21, 06:10 UTC1h 30m
2026-05-21 JJA1305 ICN → KIX May 21, 01:55 UTCMay 21, 03:20 UTC1h 25m
2026-05-20 JJA2624 SIN → ICN May 20, 20:50 UTCMay 20, 23:50 UTC3h 0m
2026-05-20 JJA2623 ICN → SIN May 20, 10:00 UTCMay 20, 15:55 UTC5h 55m
2026-05-20 JJA1306 KIX → ICN May 20, 04:50 UTCMay 20, 06:20 UTC1h 30m
2026-05-20 JJA1305 ICN → KIX May 20, 02:10 UTCMay 20, 03:30 UTC1h 20m
2026-05-19 JJA5304 DPS → ICN May 19, 06:50 UTCMay 19, 22:00 UTC15h 10m
2026-05-19 JJA1202 NGO → ICN May 19, 03:50 UTCMay 19, 05:10 UTC1h 20m
2026-05-19 JJA1201 ICN → NGO May 19, 00:45 UTCMay 19, 02:10 UTC1h 25m
2026-05-18 JJA5304 DPS → ICN May 18, 06:55 UTCMay 18, 22:00 UTC15h 4m
2026-05-18 JJA1202 NGO → ICN May 18, 03:50 UTCMay 18, 05:10 UTC1h 20m
2026-05-18 JJA1201 ICN → NGO May 18, 00:40 UTCMay 18, 02:05 UTC1h 25m
2026-05-17 JJA5304 DPS → ICN May 17, 06:55 UTCMay 17, 22:25 UTC15h 30m
2026-05-17 JJA1202 NGO → ICN May 17, 03:45 UTCMay 17, 05:05 UTC1h 20m
2026-05-17 JJA1201 ICN → NGO May 17, 00:40 UTCMay 17, 02:05 UTC1h 25m
2026-05-16 JJA5304 DPS → ICN May 16, 06:55 UTCMay 16, 21:55 UTC15h 0m
2026-05-16 JJA1202 NGO → ICN May 16, 03:45 UTCMay 16, 05:10 UTC1h 25m
2026-05-16 JJA1201 ICN → NGO May 16, 00:40 UTCMay 16, 02:05 UTC1h 25m
2026-05-15 JJA2211 ICN → DAD May 15, 00:40 UTCMay 15, 11:00 UTC10h 20m
2026-05-14 JJA1306 KIX → ICN May 14, 05:00 UTCMay 14, 06:20 UTC1h 20m
2026-05-14 JJA1305 ICN → KIX May 14, 02:10 UTCMay 14, 03:30 UTC1h 20m
2026-05-13 JJA2624 SIN → ICN May 13, 20:10 UTCMay 13, 23:10 UTC3h 0m
2026-05-13 JJA2623 ICN → SIN May 13, 09:30 UTCMay 13, 12:20 UTC2h 50m
2026-05-13 JJA1306 KIX → ICN May 13, 04:45 UTCMay 13, 06:05 UTC1h 20m

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 HL8553 page for operator, model, and routing details .

Mode-S 71C553 frequently asked

What is Mode-S code 71C553?
71C553 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8553.
Where is Mode-S 71C553 registered?
Mode-S code 71C553 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 71C553 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C553, octal 34342523, decimal 7,456,083.
What flights does 71C553 operate?
Mode-S 71C553 has broadcast 9 distinct callsigns, including JJA1201, JJA5304, JJA1202, JJA1306, JJA1305.