Apparatus

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sensors Mode-S transponder

71C031

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

Currently assigned to HL8031 · BOEING 737-800

Hex
71C031
Octal
34340061
Decimal
7,454,769
Country
KR
Tail
HL8031
Type
B738
No current signal · last broadcast Jul 26, 12:30 UTC
Flights observed
619
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 12:30 UTC

Last known position

Most recent position reported by Mode-S 71C031.

Country allocation

The ICAO 24-bit address 71C031 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
JJA6256 - 18 2026-06-19
JJA6255 - 14 2026-06-19
JJA1152 - 14 2026-07-11
JJA6154 - 13 2026-06-19
JJA226 - 13 2026-07-06
JJA225 - 13 2026-07-06
JJA136 - 13 2026-07-06
JJA127 - 13 2026-07-06
JJA1151 - 13 2026-07-10
JJA109 Jeju Air 12 2026-07-23
JJA228 Jeju Air 11 2026-07-23
JJA227 Jeju Air 11 2026-07-23
JJA138 Jeju Air 11 2026-07-23
JJA125 Jeju Air 11 2026-07-26
JJA158 - 10 2026-07-17
JJA154 Jeju Air 10 2026-07-26
JJA153 Jeju Air 10 2026-07-26
JJA152 Jeju Air 10 2026-07-25
JJA151 Jeju Air 10 2026-07-25
JJA116 - 10 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA134 CJU → GMP Jul 26, 11:45 UTCJul 26, 12:25 UTC40m
2026-07-26 JJA135 GMP → CJU Jul 26, 09:30 UTCJul 26, 10:05 UTC35m
2026-07-26 JJA126 CJU → GMP Jul 26, 07:55 UTCJul 26, 08:30 UTC35m
2026-07-26 JJA125 GMP → CJU Jul 26, 05:40 UTCJul 26, 06:10 UTC30m
2026-07-26 JJA154 CJU → GMP Jul 26, 03:45 UTCJul 26, 04:30 UTC45m
2026-07-26 JJA153 GMP → CJU Jul 26, 01:50 UTCJul 26, 02:25 UTC35m
2026-07-25 JJA152 CJU → GMP Jul 25, 23:45 UTCJul 26, 00:50 UTC1h 5m
2026-07-25 JJA151 GMP → CJU Jul 25, 21:50 UTCJul 25, 22:20 UTC30m
2026-07-25 JJA140 CJU → GMP Jul 25, 12:35 UTCJul 25, 13:15 UTC40m
2026-07-25 JJA137 GMP → CJU Jul 25, 10:30 UTCJul 25, 11:05 UTC35m
2026-07-25 JJA6124 KHH → GMP Jul 25, 05:15 UTCJul 25, 07:50 UTC2h 35m
2026-07-25 JJA6123 GMP → KHH Jul 25, 01:00 UTCJul 25, 03:25 UTC2h 25m
2026-07-24 JJA134 CJU → GMP Jul 24, 11:35 UTCJul 24, 12:20 UTC45m
2026-07-24 JJA135 GMP → CJU Jul 24, 09:40 UTCJul 24, 10:15 UTC35m
2026-07-24 JJA126 CJU → GMP Jul 24, 08:05 UTCJul 24, 08:45 UTC40m
2026-07-24 JJA125 GMP → CJU Jul 24, 05:45 UTCJul 24, 06:15 UTC30m
2026-07-24 JJA154 CJU → GMP Jul 24, 03:45 UTCJul 24, 04:25 UTC40m
2026-07-24 JJA153 GMP → CJU Jul 24, 01:30 UTCJul 24, 02:05 UTC35m
2026-07-23 JJA152 CJU → GMP Jul 23, 23:45 UTCJul 24, 00:25 UTC40m
2026-07-23 JJA151 GMP → CJU Jul 23, 21:40 UTCJul 23, 22:15 UTC35m
2026-07-23 JJA138 CJU → GMP Jul 23, 12:45 UTCJul 23, 13:30 UTC45m
2026-07-23 JJA227 CJJ → CJU Jul 23, 10:40 UTCJul 23, 11:15 UTC35m
2026-07-23 JJA228 CJU → CJJ Jul 23, 09:10 UTCJul 23, 09:40 UTC30m
2026-07-23 JJA509 PUS → CJU Jul 23, 07:00 UTCJul 23, 07:15 UTC15m
2026-07-23 JJA508 CJU → PUS Jul 23, 05:40 UTCJul 23, 06:00 UTC20m
2026-07-23 JJA505 PUS → CJU Jul 23, 03:30 UTCJul 23, 03:50 UTC20m
2026-07-23 JJA504 CJU → PUS Jul 23, 02:20 UTCJul 23, 02:35 UTC15m
2026-07-23 JJA109 GMP → CJU Jul 23, 00:05 UTCJul 23, 00:40 UTC35m
2026-07-22 JJA138 CJU → GMP Jul 22, 12:35 UTCJul 22, 13:15 UTC40m
2026-07-22 JJA505 PUS → CJU Jul 22, 03:35 UTCJul 22, 03:45 UTC10m
2026-07-22 JJA504 CJU → PUS Jul 22, 02:20 UTCJul 22, 02:35 UTC15m
2026-07-22 JJA109 GMP → CJU Jul 22, 00:05 UTCJul 22, 00:40 UTC35m
2026-07-21 JJA904 PUS → GMP Jul 21, 22:20 UTCJul 21, 23:05 UTC45m
2026-07-21 JJA907 GMP → PUS Jul 21, 11:10 UTCJul 21, 11:55 UTC45m
2026-07-21 JJA130 CJU → GMP Jul 21, 09:25 UTCJul 21, 10:10 UTC45m
2026-07-21 JJA705 - Jul 21, 07:25 UTCJul 21, 07:40 UTC15m
2026-07-21 JJA702 - Jul 21, 06:00 UTCJul 21, 06:20 UTC20m
2026-07-21 JJA119 GMP → CJU Jul 21, 03:50 UTCJul 21, 04:30 UTC40m
2026-07-21 JJA110 CJU → GMP Jul 21, 01:55 UTCJul 21, 02:40 UTC45m
2026-07-21 JJA503 PUS → CJU Jul 21, 00:00 UTCJul 21, 00:10 UTC10m
2026-07-20 JJA907 GMP → PUS Jul 20, 11:40 UTCJul 20, 12:25 UTC45m
2026-07-20 JJA128 CJU → GMP Jul 20, 10:00 UTCJul 20, 10:40 UTC40m
2026-07-20 JJA125 GMP → CJU Jul 20, 08:20 UTCJul 20, 08:30 UTC10m
2026-07-20 JJA125 GMP → CJU Jul 20, 06:50 UTCJul 20, 07:15 UTC25m
2026-07-20 JJA125 GMP → CJU Jul 20, 05:40 UTCJul 20, 06:15 UTC35m
2026-07-20 JJA154 CJU → GMP Jul 20, 03:40 UTCJul 20, 04:20 UTC40m
2026-07-20 JJA153 GMP → CJU Jul 20, 01:30 UTCJul 20, 02:10 UTC40m
2026-07-19 JJA152 - Jul 19, 23:50 UTCJul 20, 00:25 UTC35m
2026-07-19 JJA151 - Jul 19, 21:40 UTCJul 19, 22:10 UTC30m
2026-07-19 JJA138 CJU → GMP Jul 19, 12:30 UTCJul 19, 13:10 UTC40m

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 HL8031 page for operator, model, and routing details .

Mode-S 71C031 frequently asked

What is Mode-S code 71C031?
71C031 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8031.
Where is Mode-S 71C031 registered?
Mode-S code 71C031 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 71C031 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C031, octal 34340061, decimal 7,454,769.
What flights does 71C031 operate?
Mode-S 71C031 has broadcast 20 distinct callsigns, including JJA6256, JJA6255, JJA1152, JJA6154, JJA226.