Apparatus

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sensors Mode-S transponder

71C525

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

Currently assigned to HL8525 · AIRBUS A-321neo

Hex
71C525
Octal
34342445
Decimal
7,456,037
Country
KR
Tail
HL8525
Type
A21N
Broadcasting now · callsign ABL133 · 21,675 ft
Flights observed
455
Distinct callsigns
20
Country
KR
Last broadcast
Jul 26, 16:15 UTC

Current position

71C525 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C525 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
ABL794 Air Busan 26 2026-07-25
ABL793 Air Busan 25 2026-07-25
ABL781 - 24 2026-07-21
ABL726 Air Busan 20 2026-07-18
ABL792 Air Busan 19 2026-07-19
ABL725 - 19 2026-07-18
ABL8803 Air Busan 15 2026-07-24
ABL8012 Air Busan 15 2026-07-20
ABL126 Air Busan 15 2026-07-26
ABL125 Air Busan 14 2026-07-26
ABL773 - 13 2026-07-19
ABL796 - 12 2026-07-17
ABL782 - 12 2026-07-21
ABL123 Air Busan 12 2026-07-24
ABL112 - 12 2026-07-18
ABL111 Air Busan 12 2026-07-19
ABL8823 Air Busan 10 2026-07-24
ABL8820 Air Busan 10 2026-07-24
ABL8819 Air Busan 10 2026-07-24
ABL8812 Air Busan 10 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ABL7315 PUS → DAD Jul 26, 13:40 UTCJul 26, 16:15 UTC2h 35m
2026-07-26 ABL121 KIX → PUS Jul 26, 10:20 UTCJul 26, 11:20 UTC1h 0m
2026-07-26 ABL122 PUS → KIX Jul 26, 07:45 UTCJul 26, 08:45 UTC1h 0m
2026-07-26 ABL125 KIX → PUS Jul 26, 05:20 UTCJul 26, 06:30 UTC1h 10m
2026-07-26 ABL126 PUS → KIX Jul 26, 02:35 UTCJul 26, 03:35 UTC1h 0m
2026-07-26 ABL147 FUK → PUS Jul 26, 00:40 UTCJul 26, 01:05 UTC25m
2026-07-25 ABL148 PUS → FUK Jul 25, 22:45 UTCJul 25, 23:15 UTC30m
2026-07-25 ABL762 BKI → PUS Jul 25, 20:50 UTCJul 25, 21:25 UTC35m
2026-07-25 ABL762 BKI → PUS Jul 25, 16:40 UTCJul 25, 20:10 UTC3h 30m
2026-07-25 ABL761 PUS → BKI Jul 25, 10:40 UTCJul 25, 15:10 UTC4h 30m
2026-07-25 ABL794 TPE → PUS Jul 25, 07:10 UTCJul 25, 07:35 UTC25m
2026-07-25 ABL794 TPE → PUS Jul 25, 05:50 UTCJul 25, 06:10 UTC20m
2026-07-25 ABL793 PUS → TPE Jul 25, 03:40 UTCJul 25, 04:00 UTC20m
2026-07-25 ABL793 PUS → TPE Jul 25, 02:05 UTCJul 25, 02:30 UTC25m
2026-07-24 ABL8803 GMP → PUS Jul 24, 22:40 UTCJul 24, 23:20 UTC40m
2026-07-24 ABL8826 PUS → GMP Jul 24, 12:05 UTCJul 24, 12:50 UTC45m
2026-07-24 ABL8823 GMP → PUS Jul 24, 10:25 UTCJul 24, 11:10 UTC45m
2026-07-24 ABL8820 PUS → GMP Jul 24, 08:30 UTCJul 24, 09:15 UTC45m
2026-07-24 ABL8819 GMP → PUS Jul 24, 06:50 UTCJul 24, 07:30 UTC40m
2026-07-24 ABL8812 PUS → GMP Jul 24, 04:55 UTCJul 24, 05:45 UTC50m
2026-07-24 ABL123 KIX → PUS Jul 24, 02:20 UTCJul 24, 03:30 UTC1h 10m
2026-07-23 ABL124 PUS → KIX Jul 23, 23:50 UTCJul 24, 00:55 UTC1h 5m
2026-07-23 ABL794 TPE → PUS Jul 23, 05:45 UTCJul 23, 07:35 UTC1h 50m
2026-07-23 ABL793 PUS → TPE Jul 23, 02:35 UTCJul 23, 04:30 UTC1h 55m
2026-07-23 ABL8106 - Jul 23, 00:45 UTCJul 23, 01:10 UTC25m
2026-07-22 ABL8107 - Jul 22, 22:50 UTCJul 22, 23:10 UTC20m
2026-07-22 ABL762 BKI → PUS Jul 22, 16:35 UTCJul 22, 21:20 UTC4h 45m
2026-07-22 ABL761 - Jul 22, 11:10 UTCJul 22, 15:05 UTC3h 55m
2026-07-22 ABL795 PUS → KHH Jul 22, 03:20 UTCJul 22, 05:25 UTC2h 5m
2026-07-22 ABL8807 GMP → PUS Jul 22, 01:05 UTCJul 22, 01:45 UTC40m
2026-07-21 ABL8802 PUS → GMP Jul 21, 23:20 UTCJul 22, 00:00 UTC40m
2026-07-21 ABL782 - Jul 21, 20:25 UTCJul 21, 21:20 UTC55m
2026-07-21 ABL781 - Jul 21, 10:35 UTCJul 21, 19:10 UTC8h 35m
2026-07-21 ABL794 TPE → PUS Jul 21, 07:15 UTCJul 21, 07:40 UTC25m
2026-07-21 ABL794 TPE → PUS Jul 21, 05:45 UTCJul 21, 06:15 UTC30m
2026-07-21 ABL793 PUS → TPE Jul 21, 03:40 UTCJul 21, 04:00 UTC20m
2026-07-21 ABL793 PUS → TPE Jul 21, 02:10 UTCJul 21, 02:30 UTC20m
2026-07-20 ABL8803 GMP → PUS Jul 20, 22:35 UTCJul 20, 23:20 UTC45m
2026-07-20 ABL8012 CJU → GMP Jul 20, 11:05 UTCJul 20, 11:45 UTC40m
2026-07-20 ABL8135 PUS → CJU Jul 20, 09:05 UTCJul 20, 09:25 UTC20m
2026-07-20 ABL181 - Jul 20, 04:00 UTCJul 20, 06:15 UTC2h 15m
2026-07-20 ABL182 - Jul 20, 00:45 UTCJul 20, 02:45 UTC2h 0m
2026-07-19 ABL774 DAD → PUS Jul 19, 21:40 UTCJul 19, 22:05 UTC25m
2026-07-19 ABL773 - Jul 19, 12:15 UTCJul 19, 20:40 UTC8h 25m
2026-07-19 ABL792 TPE → PUS Jul 19, 10:25 UTCJul 19, 10:40 UTC15m
2026-07-19 ABL792 TPE → PUS Jul 19, 08:50 UTCJul 19, 09:20 UTC30m
2026-07-19 ABL791 PUS → TPE Jul 19, 05:35 UTCJul 19, 07:30 UTC1h 55m
2026-07-19 ABL111 NRT → PUS Jul 19, 02:30 UTCJul 19, 04:10 UTC1h 40m
2026-07-18 ABL112 PUS → NRT Jul 18, 23:05 UTCJul 19, 00:45 UTC1h 40m
2026-07-18 ABL726 BKK → PUS Jul 18, 18:25 UTCJul 18, 21:20 UTC2h 55m

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 HL8525 page for operator, model, and routing details .

Mode-S 71C525 frequently asked

What is Mode-S code 71C525?
71C525 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8525.
Where is Mode-S 71C525 registered?
Mode-S code 71C525 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 71C525 broadcasting right now?
Yes. Mode-S 71C525 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C525, octal 34342445, decimal 7,456,037.
What flights does 71C525 operate?
Mode-S 71C525 has broadcast 20 distinct callsigns, including ABL794, ABL793, ABL781, ABL726, ABL792.