Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C554

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

Currently assigned to HL8554 · BOEING 737 MAX 8

Hex
71C554
Octal
34342524
Decimal
7,456,084
Country
KR
Tail
HL8554
Type
B38M
Broadcasting now · callsign JJA8402 · 22,600 ft
Flights observed
217
Distinct callsigns
20
Country
KR
Last broadcast
13h ago

Current position

71C554 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C554 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
JJA2661 Jeju Air 14 2026-04-30
JJA1153 Jeju Air 10 2026-04-30
JJA6101 Jeju Air 8 2026-05-29
JJA6013 Jeju Air 8 2026-05-24
JJA1403 Jeju Air 8 2026-05-26
JJA1203 Jeju Air 8 2026-05-27
JJA1154 Jeju Air 8 2026-04-30
JJA6102 Jeju Air 7 2026-05-29
JJA1404 Jeju Air 7 2026-05-26
JJA1204 Jeju Air 7 2026-05-27
JJA1173 Jeju Air 7 2026-05-24
JJA1104 Jeju Air 7 2026-05-01
JJA1103 Jeju Air 7 2026-04-28
JJA2623 Jeju Air 6 2026-04-27
JJA1406 Jeju Air 6 2026-05-23
JJA1308 Jeju Air 6 2026-05-29
JJA1174 Jeju Air 6 2026-05-25
JJA8501 Jeju Air 5 2026-05-27
JJA8401 Jeju Air 5 2026-05-27
JJA6014 Jeju Air 5 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JJA1308 KIX → ICN May 29, 11:15 UTCMay 29, 12:40 UTC1h 25m
2026-05-29 JJA1307 ICN → KIX May 29, 08:15 UTCMay 29, 09:30 UTC1h 15m
2026-05-29 JJA6102 TPE → ICN May 29, 04:20 UTCMay 29, 06:25 UTC2h 5m
2026-05-29 JJA6101 ICN → TPE May 29, 00:25 UTCMay 29, 02:35 UTC2h 10m
2026-05-28 JJA2114 CEB → ICN May 28, 12:10 UTCMay 28, 22:05 UTC9h 55m
2026-05-28 JJA1106 NRT → ICN May 28, 08:20 UTCMay 28, 10:30 UTC2h 10m
2026-05-28 JJA1105 NRT → ICN May 28, 04:50 UTCMay 28, 06:55 UTC2h 5m
2026-05-28 JJA8402 TAO → ICN May 28, 02:55 UTCMay 28, 03:25 UTC30m
2026-05-27 JJA8401 ICN → TAO May 27, 23:20 UTCMay 27, 23:35 UTC15m
2026-05-27 JJA1204 NGO → ICN May 27, 09:15 UTCMay 27, 10:45 UTC1h 30m
2026-05-27 JJA1203 ICN → NGO May 27, 06:20 UTCMay 27, 07:35 UTC1h 15m
2026-05-27 JJA8502 WEH → ICN May 27, 04:30 UTCMay 27, 04:45 UTC15m
2026-05-27 JJA8501 ICN → WEH May 27, 01:54 UTCMay 27, 02:14 UTC20m
2026-05-26 JJA1404 FUK → ICN May 26, 05:20 UTCMay 26, 06:20 UTC1h 0m
2026-05-26 JJA1403 ICN → FUK May 26, 01:00 UTCMay 26, 01:30 UTC30m
2026-05-25 JJA1204 NGO → ICN May 25, 09:15 UTCMay 25, 10:40 UTC1h 25m
2026-05-25 JJA1203 ICN → NGO May 25, 06:30 UTCMay 25, 07:50 UTC1h 20m
2026-05-25 JJA1174 NRT → PUS May 25, 02:20 UTCMay 25, 04:20 UTC2h 0m
2026-05-24 JJA1173 PUS → NRT May 24, 23:15 UTCMay 24, 23:46 UTC31m
2026-05-24 JJA6014 HKG → ICN May 24, 17:15 UTCMay 24, 20:30 UTC3h 15m
2026-05-24 JJA6013 ICN → HKG May 24, 12:00 UTCMay 24, 15:30 UTC3h 30m
2026-05-24 JJA1106 NRT → ICN May 24, 08:15 UTCMay 24, 10:20 UTC2h 5m
2026-05-24 JJA1105 NRT → ICN May 24, 04:50 UTCMay 24, 06:50 UTC2h 0m
2026-05-24 JJA8402 TAO → ICN May 24, 03:00 UTCMay 24, 03:30 UTC30m
2026-05-23 JJA8401 ICN → TAO May 23, 23:35 UTCMay 23, 23:55 UTC20m
2026-05-23 JJA6014 HKG → ICN May 23, 16:55 UTCMay 23, 19:55 UTC3h 0m
2026-05-23 JJA6013 ICN → HKG May 23, 14:50 UTCMay 23, 15:20 UTC30m
2026-05-23 JJA6013 ICN → HKG May 23, 12:05 UTCMay 23, 14:20 UTC2h 15m
2026-05-23 JJA1406 FUK → ICN May 23, 09:05 UTCMay 23, 10:00 UTC55m
2026-05-23 JJA1405 ICN → FUK May 23, 06:30 UTCMay 23, 07:00 UTC30m
2026-05-23 JJA1404 FUK → ICN May 23, 03:50 UTCMay 23, 04:35 UTC45m
2026-05-23 JJA1403 ICN → FUK May 23, 01:05 UTCMay 23, 01:35 UTC30m
2026-05-22 JJA6014 HKG → ICN May 22, 17:10 UTCMay 22, 20:15 UTC3h 5m
2026-05-22 JJA6013 ICN → HKG May 22, 14:50 UTCMay 22, 15:10 UTC20m
2026-05-22 JJA6013 ICN → HKG May 22, 11:55 UTCMay 22, 14:15 UTC2h 20m
2026-05-22 JJA1406 FUK → ICN May 22, 06:35 UTCMay 22, 10:00 UTC3h 25m
2026-05-22 JJA1404 FUK → ICN May 22, 03:50 UTCMay 22, 04:30 UTC40m
2026-05-22 JJA1403 ICN → FUK May 22, 01:00 UTCMay 22, 02:00 UTC1h 0m
2026-05-21 JJA2304 CXR → ICN May 21, 12:35 UTCMay 21, 23:10 UTC10h 35m
2026-05-21 JJA1204 NGO → ICN May 21, 09:20 UTCMay 21, 10:50 UTC1h 30m
2026-05-21 JJA1203 ICN → NGO May 21, 06:25 UTCMay 21, 07:40 UTC1h 15m
2026-05-21 JJA1174 NRT → PUS May 21, 02:30 UTCMay 21, 04:40 UTC2h 10m
2026-05-20 JJA1173 PUS → NRT May 20, 22:30 UTCMay 21, 00:25 UTC1h 55m
2026-05-20 JJA1173 PUS → NRT May 20, 22:10 UTCMay 20, 22:15 UTC5m
2026-05-20 JJA1108 NRT → ICN May 20, 09:55 UTCMay 20, 12:00 UTC2h 5m
2026-05-20 JJA1107 NRT → ICN May 20, 06:20 UTCMay 20, 08:10 UTC1h 50m
2026-05-20 JJA8502 WEH → ICN May 20, 04:25 UTCMay 20, 04:45 UTC21m
2026-05-20 JJA8501 ICN → WEH May 20, 01:50 UTCMay 20, 02:15 UTC25m
2026-05-19 JJA1108 NRT → ICN May 19, 10:05 UTCMay 19, 11:55 UTC1h 50m
2026-05-19 JJA1107 NRT → ICN May 19, 06:15 UTCMay 19, 08:10 UTC1h 55m

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 HL8554 page for operator, model, and routing details .

Mode-S 71C554 frequently asked

What is Mode-S code 71C554?
71C554 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8554.
Where is Mode-S 71C554 registered?
Mode-S code 71C554 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 71C554 broadcasting right now?
Yes. Mode-S 71C554 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C554, octal 34342524, decimal 7,456,084.
What flights does 71C554 operate?
Mode-S 71C554 has broadcast 20 distinct callsigns, including JJA2661, JJA1153, JJA6101, JJA6013, JJA1403.