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
Broadcasting now · callsign JJA1201 · 4,150 ft
Flights observed
336
Distinct callsigns
16
Country
KR
Last broadcast
Jul 26, 22:30 UTC

Current position

71C553 is currently broadcasting. Map zoomed to live position.

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 16 distinct

Callsign Airline Flights Last seen
JJA5304 Jeju Air 66 2026-07-26
JJA1201 Jeju Air 66 2026-07-26
JJA1202 Jeju Air 62 2026-07-26
JJA1306 Jeju Air 36 2026-07-24
JJA1305 Jeju Air 36 2026-07-24
JJA2624 Jeju Air 24 2026-07-22
JJA2623 - 21 2026-07-22
JJA5303 - 6 2026-07-17
JJA1110 - 5 2026-07-23
JJA1109 - 5 2026-07-23
JJA8504 - 2 2026-07-03
JJA8503 - 2 2026-07-03
JJA2211 Jeju Air 2 2026-05-15
JJA5934 - 1 2026-07-11
JJA1408 - 1 2026-07-02
JJA1407 - 1 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA5304 DPS → ICN Jul 26, 07:05 UTCJul 26, 22:30 UTC15h 25m
2026-07-26 JJA1202 NGO → ICN Jul 26, 03:40 UTCJul 26, 05:10 UTC1h 30m
2026-07-26 JJA1201 ICN → NGO Jul 26, 00:50 UTCJul 26, 02:10 UTC1h 20m
2026-07-25 JJA5304 DPS → ICN Jul 25, 07:05 UTCJul 25, 22:15 UTC15h 10m
2026-07-25 JJA1202 NGO → ICN Jul 25, 03:40 UTCJul 25, 05:10 UTC1h 30m
2026-07-25 JJA1201 ICN → NGO Jul 25, 00:50 UTCJul 25, 02:15 UTC1h 25m
2026-07-24 JJA1306 KIX → ICN Jul 24, 04:45 UTCJul 24, 06:05 UTC1h 20m
2026-07-24 JJA1305 ICN → KIX Jul 24, 02:10 UTCJul 24, 03:40 UTC1h 30m
2026-07-23 JJA1110 - Jul 23, 11:15 UTCJul 23, 13:15 UTC2h 0m
2026-07-23 JJA1109 ICN → NRT Jul 23, 07:50 UTCJul 23, 09:50 UTC2h 0m
2026-07-23 JJA1306 KIX → ICN Jul 23, 04:40 UTCJul 23, 06:05 UTC1h 25m
2026-07-23 JJA1305 ICN → KIX Jul 23, 02:05 UTCJul 23, 03:30 UTC1h 25m
2026-07-22 JJA2624 SIN → ICN Jul 22, 20:20 UTCJul 22, 23:15 UTC2h 55m
2026-07-22 JJA2623 - Jul 22, 11:15 UTCJul 22, 15:20 UTC4h 5m
2026-07-22 JJA1305 ICN → KIX Jul 22, 02:30 UTCJul 22, 04:00 UTC1h 30m
2026-07-21 JJA5304 - Jul 21, 07:25 UTCJul 21, 22:25 UTC15h 0m
2026-07-21 JJA1202 NGO → ICN Jul 21, 04:30 UTCJul 21, 06:00 UTC1h 30m
2026-07-21 JJA1201 ICN → NGO Jul 21, 00:50 UTCJul 21, 02:15 UTC1h 25m
2026-07-20 JJA5304 ICN → ICN Jul 20, 07:05 UTCJul 20, 22:15 UTC15h 10m
2026-07-20 JJA1202 NGO → ICN Jul 20, 04:20 UTCJul 20, 05:45 UTC1h 25m
2026-07-20 JJA1201 ICN → NGO Jul 20, 00:45 UTCJul 20, 02:10 UTC1h 25m
2026-07-19 JJA5304 ICN → ICN Jul 19, 06:55 UTCJul 19, 21:55 UTC15h 0m
2026-07-18 JJA5304 ICN → ICN Jul 18, 07:05 UTCJul 18, 22:15 UTC15h 10m
2026-07-18 JJA1202 - Jul 18, 03:40 UTCJul 18, 05:05 UTC1h 25m
2026-07-18 JJA1201 - Jul 18, 00:50 UTCJul 18, 02:05 UTC1h 15m
2026-07-17 JJA5304 - Jul 17, 08:25 UTCJul 17, 22:15 UTC13h 50m
2026-07-17 JJA5303 - Jul 17, 07:00 UTCJul 17, 07:40 UTC40m
2026-07-17 JJA1202 - Jul 17, 03:39 UTCJul 17, 04:59 UTC1h 20m
2026-07-17 JJA1201 - Jul 17, 00:50 UTCJul 17, 02:05 UTC1h 15m
2026-07-16 JJA1306 KIX → ICN Jul 16, 04:45 UTCJul 16, 06:00 UTC1h 15m
2026-07-16 JJA1305 ICN → KIX Jul 16, 02:00 UTCJul 16, 03:20 UTC1h 20m
2026-07-15 JJA2624 - Jul 15, 20:20 UTCJul 15, 23:20 UTC3h 0m
2026-07-15 JJA2624 - Jul 15, 17:05 UTCJul 15, 17:15 UTC10m
2026-07-15 JJA2623 - Jul 15, 14:55 UTCJul 15, 15:15 UTC20m
2026-07-15 JJA2623 - Jul 15, 09:40 UTCJul 15, 12:25 UTC2h 45m
2026-07-15 JJA1306 KIX → ICN Jul 15, 04:45 UTCJul 15, 06:05 UTC1h 20m
2026-07-15 JJA1305 ICN → KIX Jul 15, 02:00 UTCJul 15, 03:35 UTC1h 35m
2026-07-14 JJA5304 ICN → ICN Jul 14, 07:00 UTCJul 14, 22:00 UTC15h 0m
2026-07-14 JJA1202 - Jul 14, 03:40 UTCJul 14, 05:10 UTC1h 30m
2026-07-14 JJA1201 - Jul 14, 00:50 UTCJul 14, 02:10 UTC1h 20m
2026-07-13 JJA5304 ICN → ICN Jul 13, 06:55 UTCJul 13, 22:15 UTC15h 20m
2026-07-13 JJA1202 - Jul 13, 03:45 UTCJul 13, 05:10 UTC1h 25m
2026-07-13 JJA1201 - Jul 13, 00:50 UTCJul 13, 02:10 UTC1h 20m
2026-07-12 JJA5304 ICN → ICN Jul 12, 07:10 UTCJul 12, 22:15 UTC15h 5m
2026-07-12 JJA1202 - Jul 12, 03:40 UTCJul 12, 05:10 UTC1h 30m
2026-07-12 JJA1201 - Jul 12, 00:45 UTCJul 12, 02:05 UTC1h 20m
2026-07-11 JJA5934 - Jul 11, 10:15 UTCJul 11, 15:20 UTC5h 5m
2026-07-10 JJA5303 - Jul 10, 11:25 UTCJul 11, 10:45 UTC23h 20m
2026-07-10 JJA5303 - Jul 10, 07:00 UTCJul 10, 11:55 UTC4h 55m
2026-07-10 JJA1202 - Jul 10, 03:45 UTCJul 10, 05:20 UTC1h 35m

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?
Yes. Mode-S 71C553 is currently airborne.
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 16 distinct callsigns, including JJA5304, JJA1201, JJA1202, JJA1306, JJA1305.