Apparatus

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sensors Mode-S transponder

71C357

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

Currently assigned to HL8357 · BOEING 737 MAX 8

Hex
71C357
Octal
34341527
Decimal
7,455,575
Country
KR
Tail
HL8357
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
432
Distinct callsigns
20
Country
KR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 71C357.

Country allocation

The ICAO 24-bit address 71C357 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
ABL8819 - 21 2026-07-10
ABL792 - 21 2026-07-07
ABL8823 - 20 2026-07-10
ABL8820 - 20 2026-07-10
ABL8812 - 20 2026-07-10
ABL123 - 20 2026-07-10
ABL795 - 18 2026-07-14
ABL791 - 17 2026-07-07
ABL773 - 17 2026-07-09
ABL111 - 16 2026-07-07
ABL793 - 15 2026-07-12
ABL112 Air Busan 15 2026-07-06
ABL781 - 14 2026-07-04
ABL796 - 13 2026-07-13
ABL794 - 12 2026-07-12
ABL124 - 12 2026-07-09
ABL121 - 10 2026-07-11
ABL8826 - 9 2026-07-10
ABL8803 - 8 2026-07-10
ABL726 - 7 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ABL795 PUS → KHH Jul 14, 02:50 UTCJul 14, 05:05 UTC2h 15m
2026-07-14 ABL8106 - Jul 14, 00:55 UTCJul 14, 01:10 UTC15m
2026-07-13 ABL8107 - Jul 13, 22:50 UTCJul 13, 23:05 UTC15m
2026-07-13 ABL796 - Jul 13, 12:05 UTCJul 13, 12:25 UTC20m
2026-07-13 ABL796 - Jul 13, 10:20 UTCJul 13, 11:10 UTC50m
2026-07-13 ABL795 TPE → KHH Jul 13, 08:30 UTCJul 13, 09:10 UTC40m
2026-07-13 ABL795 PUS → TPE Jul 13, 03:05 UTCJul 13, 06:25 UTC3h 20m
2026-07-13 ABL8106 - Jul 13, 01:20 UTCJul 13, 01:40 UTC20m
2026-07-12 ABL8107 - Jul 12, 23:05 UTCJul 12, 23:20 UTC15m
2026-07-12 ABL382 - Jul 12, 18:20 UTCJul 12, 21:25 UTC3h 5m
2026-07-12 ABL381 - Jul 12, 13:10 UTCJul 12, 16:10 UTC3h 0m
2026-07-12 ABL143 - Jul 12, 11:05 UTCJul 12, 11:40 UTC35m
2026-07-12 ABL144 - Jul 12, 09:05 UTCJul 12, 09:35 UTC30m
2026-07-12 ABL794 - Jul 12, 07:15 UTCJul 12, 07:35 UTC20m
2026-07-12 ABL794 - Jul 12, 05:45 UTCJul 12, 06:15 UTC30m
2026-07-12 ABL793 PUS → TPE Jul 12, 02:20 UTCJul 12, 04:30 UTC2h 10m
2026-07-11 ABL342 PUS → PUS Jul 11, 13:15 UTCJul 11, 21:10 UTC7h 55m
2026-07-11 ABL121 KIX → PUS Jul 11, 10:35 UTCJul 11, 11:30 UTC55m
2026-07-11 ABL122 PUS → KIX Jul 11, 07:45 UTCJul 11, 08:50 UTC1h 5m
2026-07-10 ABL8803 GMP → PUS Jul 10, 22:35 UTCJul 10, 23:15 UTC40m
2026-07-10 ABL8826 PUS → GMP Jul 10, 12:05 UTCJul 10, 12:45 UTC40m
2026-07-10 ABL8823 GMP → PUS Jul 10, 10:20 UTCJul 10, 11:00 UTC40m
2026-07-10 ABL8820 PUS → GMP Jul 10, 08:35 UTCJul 10, 09:20 UTC45m
2026-07-10 ABL8819 GMP → PUS Jul 10, 06:45 UTCJul 10, 07:30 UTC45m
2026-07-10 ABL8812 PUS → GMP Jul 10, 05:00 UTCJul 10, 05:45 UTC45m
2026-07-10 ABL123 KIX → PUS Jul 10, 02:30 UTCJul 10, 03:35 UTC1h 5m
2026-07-09 ABL124 PUS → KIX Jul 9, 23:40 UTCJul 10, 00:50 UTC1h 10m
2026-07-09 ABL774 - Jul 9, 21:30 UTCJul 9, 21:50 UTC20m
2026-07-09 ABL773 - Jul 9, 12:05 UTCJul 9, 20:15 UTC8h 10m
2026-07-09 ABL796 - Jul 9, 08:35 UTCJul 9, 08:50 UTC15m
2026-07-09 ABL796 - Jul 9, 06:40 UTCJul 9, 07:25 UTC45m
2026-07-09 ABL795 PUS → KHH Jul 9, 03:00 UTCJul 9, 05:25 UTC2h 25m
2026-07-09 ABL8106 - Jul 9, 01:00 UTCJul 9, 01:15 UTC15m
2026-07-08 ABL8107 - Jul 8, 23:05 UTCJul 8, 23:20 UTC15m
2026-07-08 ABL762 - Jul 8, 20:50 UTCJul 8, 21:25 UTC35m
2026-07-08 ABL762 - Jul 8, 16:35 UTCJul 8, 20:05 UTC3h 30m
2026-07-08 ABL761 PUS → BKI Jul 8, 10:40 UTCJul 8, 15:15 UTC4h 35m
2026-07-08 ABL8819 GMP → PUS Jul 8, 06:50 UTCJul 8, 07:30 UTC40m
2026-07-08 ABL8812 PUS → GMP Jul 8, 04:55 UTCJul 8, 05:55 UTC1h 0m
2026-07-08 ABL123 - Jul 8, 02:20 UTCJul 8, 03:25 UTC1h 5m
2026-07-07 ABL124 PUS → KIX Jul 7, 23:50 UTCJul 8, 00:50 UTC1h 0m
2026-07-07 ABL773 PUS → PUS Jul 7, 12:05 UTCJul 7, 22:25 UTC10h 20m
2026-07-07 ABL792 - Jul 7, 10:35 UTCJul 7, 10:50 UTC15m
2026-07-07 ABL792 - Jul 7, 09:05 UTCJul 7, 09:30 UTC25m
2026-07-07 ABL791 PUS → TPE Jul 7, 05:30 UTCJul 7, 07:35 UTC2h 5m
2026-07-07 ABL111 - Jul 7, 02:10 UTCJul 7, 03:45 UTC1h 35m
2026-07-06 ABL112 PUS → NRT Jul 6, 23:15 UTCJul 7, 00:50 UTC1h 35m
2026-07-06 ABL774 - Jul 6, 21:30 UTCJul 6, 21:45 UTC15m
2026-07-06 ABL773 - Jul 6, 13:35 UTCJul 6, 20:25 UTC6h 50m
2026-07-06 ABL773 - Jul 6, 12:15 UTCJul 6, 12:35 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 HL8357 page for operator, model, and routing details .

Mode-S 71C357 frequently asked

What is Mode-S code 71C357?
71C357 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8357.
Where is Mode-S 71C357 registered?
Mode-S code 71C357 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 71C357 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C357, octal 34341527, decimal 7,455,575.
What flights does 71C357 operate?
Mode-S 71C357 has broadcast 20 distinct callsigns, including ABL8819, ABL792, ABL8823, ABL8820, ABL8812.