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sensors Mode-S transponder

71C555

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

Currently assigned to HL8555 · BOEING 737 MAX 8

Hex
71C555
Octal
34342525
Decimal
7,456,085
Country
KR
Tail
HL8555
Type
B38M
Broadcasting now · callsign JJA1107 · 35,000 ft
Flights observed
494
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 21:15 UTC

Current position

71C555 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C555 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
JJA2662 Jeju Air 22 2026-07-16
JJA2661 - 22 2026-07-16
JJA1107 Jeju Air 20 2026-07-25
JJA6101 - 19 2026-07-18
JJA6102 - 18 2026-07-18
JJA6013 - 17 2026-07-12
JJA1108 Jeju Air 17 2026-07-25
JJA1106 - 16 2026-07-11
JJA1105 - 16 2026-07-11
JJA1154 - 15 2026-07-16
JJA1153 - 15 2026-07-17
JJA8401 - 14 2026-07-09
JJA1802 - 14 2026-07-03
JJA8501 Jeju Air 13 2026-07-25
JJA1302 - 13 2026-07-11
JJA1301 - 13 2026-07-10
JJA8502 Jeju Air 12 2026-07-25
JJA1801 - 12 2026-07-03
JJA6014 - 11 2026-07-12
JJA1307 - 11 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA6094 HKG → ICN Jul 26, 17:55 UTCJul 26, 21:15 UTC3h 20m
2026-07-26 JJA6093 - Jul 26, 16:00 UTCJul 26, 16:15 UTC15m
2026-07-26 JJA6093 - Jul 26, 13:00 UTCJul 26, 15:30 UTC2h 30m
2026-07-26 JJA1406 FUK → ICN Jul 26, 09:00 UTCJul 26, 09:55 UTC55m
2026-07-26 JJA1405 ICN → FUK Jul 26, 06:25 UTCJul 26, 07:25 UTC1h 1m
2026-07-26 JJA1502 CTS → ICN Jul 26, 02:10 UTCJul 26, 04:40 UTC2h 30m
2026-07-25 JJA1501 ICN → CTS Jul 25, 22:35 UTCJul 26, 00:55 UTC2h 20m
2026-07-25 JJA1108 NRT → ICN Jul 25, 10:40 UTCJul 25, 12:35 UTC1h 55m
2026-07-25 JJA1107 NRT → ICN Jul 25, 07:05 UTCJul 25, 09:10 UTC2h 5m
2026-07-25 JJA8502 WEH → ICN Jul 25, 04:55 UTCJul 25, 05:20 UTC25m
2026-07-25 JJA8501 ICN → WEH Jul 25, 02:05 UTCJul 25, 02:25 UTC20m
2026-07-24 JJA2114 CEB → ICN Jul 24, 12:20 UTCJul 24, 22:10 UTC9h 50m
2026-07-24 JJA2212 DAD → ICN Jul 24, 00:35 UTCJul 24, 10:45 UTC10h 10m
2026-07-23 JJA2114 CEB → ICN Jul 23, 12:30 UTCJul 23, 22:25 UTC9h 55m
2026-07-23 JJA2212 DAD → ICN Jul 23, 00:40 UTCJul 23, 10:50 UTC10h 10m
2026-07-22 JJA2114 CEB → ICN Jul 22, 12:35 UTCJul 22, 22:10 UTC9h 35m
2026-07-22 JJA2211 ICN → DAD Jul 22, 00:50 UTCJul 22, 03:40 UTC2h 50m
2026-07-21 JJA2516 CNX → ICN Jul 21, 16:10 UTCJul 21, 21:20 UTC5h 10m
2026-07-21 JJA2515 - Jul 21, 09:35 UTCJul 21, 14:15 UTC4h 40m
2026-07-21 JJA1104 NRT → ICN Jul 21, 05:45 UTCJul 21, 07:45 UTC2h 0m
2026-07-21 JJA1103 NRT → ICN Jul 21, 01:50 UTCJul 21, 03:50 UTC2h 0m
2026-07-20 JJA2303 ICN → CXR Jul 20, 12:50 UTCJul 20, 23:10 UTC10h 20m
2026-07-20 JJA1204 NGO → ICN Jul 20, 09:20 UTCJul 20, 10:55 UTC1h 35m
2026-07-20 JJA1203 ICN → NGO Jul 20, 06:30 UTCJul 20, 07:50 UTC1h 20m
2026-07-20 JJA1404 FUK → ICN Jul 20, 03:40 UTCJul 20, 04:30 UTC50m
2026-07-20 JJA1403 ICN → FUK Jul 20, 01:15 UTCJul 20, 02:10 UTC55m
2026-07-19 JJA2108 - Jul 19, 17:50 UTCJul 19, 21:10 UTC3h 20m
2026-07-19 JJA2107 ICN → CRK Jul 19, 12:40 UTCJul 19, 16:00 UTC3h 20m
2026-07-19 JJA1406 FUK → ICN Jul 19, 09:00 UTCJul 19, 09:55 UTC55m
2026-07-19 JJA1405 ICN → FUK Jul 19, 06:25 UTCJul 19, 07:15 UTC50m
2026-07-19 JJA1502 - Jul 19, 02:15 UTCJul 19, 04:45 UTC2h 30m
2026-07-18 JJA1501 - Jul 18, 22:25 UTCJul 19, 00:45 UTC2h 20m
2026-07-18 JJA1308 KIX → ICN Jul 18, 11:25 UTCJul 18, 12:45 UTC1h 20m
2026-07-18 JJA1307 ICN → KIX Jul 18, 08:55 UTCJul 18, 10:25 UTC1h 30m
2026-07-18 JJA6102 - Jul 18, 05:50 UTCJul 18, 06:35 UTC45m
2026-07-18 JJA6102 - Jul 18, 04:25 UTCJul 18, 04:40 UTC15m
2026-07-18 JJA6101 - Jul 18, 02:25 UTCJul 18, 02:40 UTC15m
2026-07-18 JJA6101 - Jul 18, 00:39 UTCJul 18, 01:25 UTC45m
2026-07-17 JJA2516 - Jul 17, 16:10 UTCJul 17, 21:44 UTC5h 35m
2026-07-17 JJA2515 - Jul 17, 09:30 UTCJul 17, 14:20 UTC4h 50m
2026-07-17 JJA1104 NRT → ICN Jul 17, 05:39 UTCJul 17, 07:35 UTC1h 55m
2026-07-17 JJA1153 PUS → NRT Jul 17, 02:05 UTCJul 17, 03:39 UTC1h 35m
2026-07-16 JJA2662 SIN → PUS Jul 16, 22:05 UTCJul 16, 22:30 UTC25m
2026-07-16 JJA2662 SIN → PUS Jul 16, 19:50 UTCJul 16, 21:00 UTC1h 10m
2026-07-16 JJA2661 - Jul 16, 10:55 UTCJul 16, 14:50 UTC3h 55m
2026-07-16 JJA2661 - Jul 16, 09:25 UTCJul 16, 09:40 UTC15m
2026-07-16 JJA1154 NRT → PUS Jul 16, 05:35 UTCJul 16, 07:15 UTC1h 40m
2026-07-16 JJA1153 PUS → NRT Jul 16, 02:20 UTCJul 16, 04:00 UTC1h 40m
2026-07-15 JJA2662 - Jul 15, 19:45 UTCJul 15, 22:25 UTC2h 40m
2026-07-15 JJA2662 - Jul 15, 16:30 UTCJul 15, 16:40 UTC10m

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 HL8555 page for operator, model, and routing details .

Mode-S 71C555 frequently asked

What is Mode-S code 71C555?
71C555 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8555.
Where is Mode-S 71C555 registered?
Mode-S code 71C555 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 71C555 broadcasting right now?
Yes. Mode-S 71C555 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C555, octal 34342525, decimal 7,456,085.
What flights does 71C555 operate?
Mode-S 71C555 has broadcast 20 distinct callsigns, including JJA2662, JJA2661, JJA1107, JJA6101, JJA6102.