Apparatus

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sensors Mode-S transponder

71C051

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

Currently assigned to HL8051 · BOEING 737-800

Hex
71C051
Octal
34340121
Decimal
7,454,801
Country
KR
Tail
HL8051
Type
B738
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
573
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S 71C051.

Country allocation

The ICAO 24-bit address 71C051 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
JJA214 - 12 2026-07-17
JJA213 - 12 2026-07-17
JJA107 - 12 2026-07-16
JJA227 - 11 2026-07-20
JJA105 Jeju Air 11 2026-07-26
JJA228 - 10 2026-07-20
JJA138 Jeju Air 10 2026-07-20
JJA119 - 10 2026-07-13
JJA130 - 9 2026-07-13
JJA118 Jeju Air 9 2026-07-25
JJA113 Jeju Air 9 2026-07-25
JJA109 - 9 2026-07-14
JJA104 Jeju Air 9 2026-07-25
JJA306 - 8 2026-07-17
JJA305 - 8 2026-07-17
JJA110 - 8 2026-07-13
JJA6154 - 7 2026-07-12
JJA509 Jeju Air 7 2026-07-20
JJA508 Jeju Air 7 2026-07-20
JJA226 Jeju Air 7 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JJA105 GMP → CJU Jul 26, 22:05 UTCJul 26, 22:15 UTC10m
2026-07-26 JJA140 CJU → GMP Jul 26, 12:35 UTCJul 26, 13:15 UTC40m
2026-07-26 JJA137 GMP → CJU Jul 26, 10:35 UTCJul 26, 11:10 UTC35m
2026-07-26 JJA1328 KIX → GMP Jul 26, 07:55 UTCJul 26, 09:15 UTC1h 20m
2026-07-26 JJA1327 GMP → KIX Jul 26, 05:05 UTCJul 26, 06:30 UTC1h 25m
2026-07-26 JJA1326 KIX → GMP Jul 26, 02:15 UTCJul 26, 03:35 UTC1h 20m
2026-07-25 JJA1325 GMP → KIX Jul 25, 23:15 UTCJul 26, 00:40 UTC1h 25m
2026-07-25 JJA136 CJU → GMP Jul 25, 12:55 UTCJul 25, 13:40 UTC45m
2026-07-25 JJA225 CJJ → CJU Jul 25, 10:35 UTCJul 25, 11:00 UTC25m
2026-07-25 JJA226 CJU → CJJ Jul 25, 08:55 UTCJul 25, 09:25 UTC30m
2026-07-25 JJA127 GMP → CJU Jul 25, 06:30 UTCJul 25, 07:05 UTC35m
2026-07-25 JJA118 CJU → GMP Jul 25, 04:10 UTCJul 25, 05:00 UTC50m
2026-07-25 JJA113 GMP → CJU Jul 25, 01:50 UTCJul 25, 02:30 UTC40m
2026-07-25 JJA104 CJU → GMP Jul 25, 00:10 UTCJul 25, 00:55 UTC45m
2026-07-24 JJA105 GMP → CJU Jul 24, 22:05 UTCJul 24, 22:45 UTC40m
2026-07-24 JJA136 CJU → GMP Jul 24, 12:15 UTCJul 24, 12:55 UTC40m
2026-07-24 JJA225 CJJ → CJU Jul 24, 10:15 UTCJul 24, 10:50 UTC35m
2026-07-24 JJA226 CJU → CJJ Jul 24, 08:40 UTCJul 24, 09:15 UTC35m
2026-07-24 JJA127 GMP → CJU Jul 24, 06:20 UTCJul 24, 06:55 UTC35m
2026-07-24 JJA118 CJU → GMP Jul 24, 04:05 UTCJul 24, 04:45 UTC40m
2026-07-24 JJA113 GMP → CJU Jul 24, 01:55 UTCJul 24, 02:30 UTC35m
2026-07-24 JJA104 CJU → GMP Jul 24, 00:05 UTCJul 24, 00:45 UTC40m
2026-07-23 JJA105 GMP → CJU Jul 23, 22:05 UTCJul 23, 22:40 UTC35m
2026-07-23 JJA134 - Jul 23, 11:50 UTCJul 23, 12:35 UTC45m
2026-07-23 JJA135 GMP → CJU Jul 23, 09:55 UTCJul 23, 10:30 UTC35m
2026-07-23 JJA126 CJU → GMP Jul 23, 08:15 UTCJul 23, 09:00 UTC45m
2026-07-23 JJA125 GMP → CJU Jul 23, 05:50 UTCJul 23, 06:25 UTC35m
2026-07-23 JJA154 CJU → GMP Jul 23, 03:40 UTCJul 23, 04:20 UTC40m
2026-07-23 JJA153 GMP → CJU Jul 23, 01:30 UTCJul 23, 02:05 UTC35m
2026-07-22 JJA152 CJU → GMP Jul 22, 23:50 UTCJul 23, 00:30 UTC40m
2026-07-22 JJA151 GMP → CJU Jul 22, 21:50 UTCJul 22, 22:25 UTC35m
2026-07-22 JJA158 CJU → GMP Jul 22, 11:35 UTCJul 22, 12:10 UTC35m
2026-07-22 JJA155 GMP → CJU Jul 22, 05:20 UTCJul 22, 05:25 UTC5m
2026-07-22 JJA116 CJU → GMP Jul 22, 03:15 UTCJul 22, 03:50 UTC35m
2026-07-22 JJA211 PUS → GMP Jul 22, 01:05 UTCJul 22, 01:35 UTC30m
2026-07-21 JJA212 CJU → CJJ Jul 21, 23:35 UTCJul 22, 00:05 UTC30m
2026-07-21 JJA101 - Jul 21, 21:40 UTCJul 21, 22:15 UTC35m
2026-07-21 JJA136 - Jul 21, 12:20 UTCJul 21, 13:00 UTC40m
2026-07-21 JJA225 CJJ → CJU Jul 21, 10:05 UTCJul 21, 10:35 UTC30m
2026-07-21 JJA226 CJU → CJJ Jul 21, 08:35 UTCJul 21, 09:10 UTC35m
2026-07-21 JJA127 GMP → CJU Jul 21, 06:30 UTCJul 21, 07:05 UTC35m
2026-07-21 JJA118 CJU → GMP Jul 21, 03:55 UTCJul 21, 04:35 UTC40m
2026-07-21 JJA113 GMP → CJU Jul 21, 01:55 UTCJul 21, 02:30 UTC35m
2026-07-21 JJA104 CJU → GMP Jul 21, 00:10 UTCJul 21, 00:50 UTC40m
2026-07-20 JJA105 GMP → CJU Jul 20, 22:05 UTCJul 20, 22:40 UTC35m
2026-07-20 JJA138 CJU → GMP Jul 20, 12:40 UTCJul 20, 13:20 UTC40m
2026-07-20 JJA227 - Jul 20, 10:35 UTCJul 20, 11:00 UTC25m
2026-07-20 JJA228 - Jul 20, 09:10 UTCJul 20, 09:35 UTC25m
2026-07-20 JJA509 PUS → CJU Jul 20, 07:05 UTCJul 20, 07:20 UTC15m
2026-07-20 JJA508 CJU → PUS Jul 20, 05:45 UTCJul 20, 06:05 UTC20m

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 HL8051 page for operator, model, and routing details .

Mode-S 71C051 frequently asked

What is Mode-S code 71C051?
71C051 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8051.
Where is Mode-S 71C051 registered?
Mode-S code 71C051 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 71C051 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C051, octal 34340121, decimal 7,454,801.
What flights does 71C051 operate?
Mode-S 71C051 has broadcast 20 distinct callsigns, including JJA214, JJA213, JJA107, JJA227, JJA105.