Apparatus

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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
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
486
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S 71C554.

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 28 2026-07-19
JJA1153 Jeju Air 22 2026-07-20
JJA2662 Jeju Air 21 2026-07-19
JJA1154 Jeju Air 20 2026-07-19
JJA6013 - 18 2026-07-11
JJA6101 - 16 2026-07-15
JJA1406 Jeju Air 16 2026-07-24
JJA1104 Jeju Air 16 2026-07-26
JJA1103 Jeju Air 16 2026-07-26
JJA1405 Jeju Air 15 2026-07-24
JJA6014 - 14 2026-07-11
JJA1203 Jeju Air 13 2026-07-21
JJA6102 - 12 2026-07-15
JJA1404 Jeju Air 12 2026-07-23
JJA1403 Jeju Air 12 2026-07-23
JJA1204 Jeju Air 12 2026-07-21
JJA1308 Jeju Air 11 2026-07-23
JJA8501 - 10 2026-06-30
JJA1307 Jeju Air 10 2026-07-23
JJA8502 - 9 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA2516 CNX → ICN Jul 26, 20:40 UTCJul 26, 21:10 UTC30m
2026-07-26 JJA2516 CNX → ICN Jul 26, 16:20 UTCJul 26, 17:35 UTC1h 15m
2026-07-26 JJA2515 ICN → CNX Jul 26, 13:15 UTCJul 26, 14:40 UTC1h 25m
2026-07-26 JJA2515 ICN → CNX Jul 26, 09:30 UTCJul 26, 09:50 UTC20m
2026-07-26 JJA1104 NRT → ICN Jul 26, 05:30 UTCJul 26, 07:30 UTC2h 1m
2026-07-26 JJA1103 NRT → ICN Jul 26, 01:55 UTCJul 26, 03:50 UTC1h 55m
2026-07-25 JJA2504 BKK → ICN Jul 25, 23:05 UTCJul 25, 23:25 UTC20m
2026-07-25 JJA2504 BKK → ICN Jul 25, 18:20 UTCJul 25, 20:05 UTC1h 45m
2026-07-25 JJA2503 ICN → BKK Jul 25, 11:30 UTCJul 25, 16:40 UTC5h 10m
2026-07-25 JJA1802 OKA → ICN Jul 25, 09:05 UTCJul 25, 09:45 UTC40m
2026-07-25 JJA1802 OKA → ICN Jul 25, 07:55 UTCJul 25, 08:10 UTC15m
2026-07-25 JJA1801 ICN → OKA Jul 25, 05:55 UTCJul 25, 06:15 UTC20m
2026-07-25 JJA1801 ICN → OKA Jul 25, 04:35 UTCJul 25, 05:10 UTC35m
2026-07-25 JJA1302 ICN → KIX Jul 25, 01:25 UTCJul 25, 02:50 UTC1h 25m
2026-07-24 JJA1301 KIX → ICN Jul 24, 22:25 UTCJul 24, 23:45 UTC1h 20m
2026-07-24 JJA1406 FUK → ICN Jul 24, 09:05 UTCJul 24, 10:05 UTC1h 0m
2026-07-24 JJA1405 ICN → FUK Jul 24, 06:40 UTCJul 24, 07:15 UTC35m
2026-07-24 JJA1502 CTS → ICN Jul 24, 02:15 UTCJul 24, 04:40 UTC2h 25m
2026-07-23 JJA1501 ICN → CTS Jul 23, 22:25 UTCJul 24, 00:45 UTC2h 20m
2026-07-23 JJA1308 KIX → ICN Jul 23, 11:10 UTCJul 23, 12:35 UTC1h 25m
2026-07-23 JJA1307 ICN → KIX Jul 23, 08:35 UTCJul 23, 09:55 UTC1h 20m
2026-07-23 JJA1404 FUK → ICN Jul 23, 03:30 UTCJul 23, 04:25 UTC55m
2026-07-23 JJA1403 ICN → FUK Jul 23, 01:05 UTCJul 23, 01:50 UTC45m
2026-07-22 JJA2516 - Jul 22, 16:25 UTCJul 22, 21:35 UTC5h 10m
2026-07-22 JJA2515 - Jul 22, 13:00 UTCJul 22, 15:05 UTC2h 5m
2026-07-22 JJA1175 NRT → PUS Jul 22, 01:25 UTCJul 22, 03:25 UTC2h 0m
2026-07-21 JJA2108 - Jul 21, 17:55 UTCJul 21, 21:15 UTC3h 20m
2026-07-21 JJA2107 ICN → CRK Jul 21, 13:05 UTCJul 21, 16:30 UTC3h 25m
2026-07-21 JJA1204 NGO → ICN Jul 21, 09:15 UTCJul 21, 10:40 UTC1h 25m
2026-07-21 JJA1203 ICN → NGO Jul 21, 06:25 UTCJul 21, 07:45 UTC1h 20m
2026-07-21 JJA1404 FUK → ICN Jul 21, 03:45 UTCJul 21, 04:45 UTC1h 0m
2026-07-21 JJA1403 ICN → FUK Jul 21, 01:15 UTCJul 21, 02:00 UTC45m
2026-07-20 JJA2516 - Jul 20, 16:05 UTCJul 20, 21:20 UTC5h 15m
2026-07-20 JJA2515 - Jul 20, 09:35 UTCJul 20, 14:20 UTC4h 45m
2026-07-20 JJA1104 NRT → ICN Jul 20, 05:35 UTCJul 20, 07:30 UTC1h 55m
2026-07-20 JJA1153 NRT → PUS Jul 20, 02:10 UTCJul 20, 03:50 UTC1h 40m
2026-07-19 JJA2662 SIN → PUS Jul 19, 22:25 UTCJul 19, 22:45 UTC20m
2026-07-19 JJA2662 SIN → PUS Jul 19, 20:10 UTCJul 19, 21:15 UTC1h 5m
2026-07-19 JJA2662 SIN → PUS Jul 19, 16:55 UTCJul 19, 17:05 UTC10m
2026-07-19 JJA2661 PUS → SIN Jul 19, 14:55 UTCJul 19, 15:15 UTC20m
2026-07-19 JJA2661 PUS → SIN Jul 19, 09:35 UTCJul 19, 12:10 UTC2h 35m
2026-07-19 JJA1154 NRT → PUS Jul 19, 05:35 UTCJul 19, 07:05 UTC1h 30m
2026-07-19 JJA1153 NRT → PUS Jul 19, 02:15 UTCJul 19, 04:00 UTC1h 45m
2026-07-18 JJA2662 SIN → PUS Jul 18, 22:30 UTCJul 18, 22:50 UTC20m
2026-07-18 JJA2662 SIN → PUS Jul 18, 20:10 UTCJul 18, 21:20 UTC1h 10m
2026-07-18 JJA2661 - Jul 18, 09:30 UTCJul 18, 15:15 UTC5h 45m
2026-07-18 JJA1154 NRT → PUS Jul 18, 05:30 UTCJul 18, 07:10 UTC1h 40m
2026-07-18 JJA1153 PUS → NRT Jul 18, 02:09 UTCJul 18, 03:50 UTC1h 41m
2026-07-17 JJA2662 SIN → PUS Jul 17, 22:25 UTCJul 17, 22:45 UTC20m
2026-07-17 JJA2662 SIN → PUS Jul 17, 20:00 UTCJul 17, 21:10 UTC1h 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 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?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
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, JJA2662, JJA1154, JJA6013.