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 ABL111 · 26,000 ft
Flights observed
378
Distinct callsigns
20
Country
KR
Last broadcast
6m ago

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
ABL781 - 23 2026-06-30
ABL794 - 21 2026-07-14
ABL793 - 20 2026-07-14
ABL792 - 15 2026-07-12
ABL726 - 15 2026-07-07
ABL725 - 15 2026-07-07
ABL8012 - 14 2026-07-13
ABL126 Air Busan 14 2026-05-30
ABL8803 - 13 2026-07-13
ABL125 Air Busan 13 2026-05-30
ABL782 - 11 2026-07-11
ABL773 - 11 2026-07-12
ABL123 - 11 2026-07-03
ABL112 - 11 2026-07-14
ABL111 - 11 2026-07-15
ABL796 - 10 2026-07-04
ABL8823 - 9 2026-07-03
ABL8820 - 9 2026-07-03
ABL8819 - 9 2026-07-03
ABL8812 - 9 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 ABL111 - Jul 15, 02:25 UTCJul 15, 03:15 UTC50m
2026-07-14 ABL112 PUS → NRT Jul 14, 23:15 UTCJul 15, 00:50 UTC1h 35m
2026-07-14 ABL712 PUS → PUS Jul 14, 11:05 UTCJul 14, 21:45 UTC10h 40m
2026-07-14 ABL794 - Jul 14, 07:20 UTCJul 14, 07:35 UTC15m
2026-07-14 ABL794 - Jul 14, 05:50 UTCJul 14, 06:15 UTC25m
2026-07-14 ABL793 PUS → TPE Jul 14, 02:10 UTCJul 14, 04:05 UTC1h 55m
2026-07-13 ABL8803 GMP → PUS Jul 13, 22:45 UTCJul 13, 23:25 UTC40m
2026-07-13 ABL8012 - Jul 13, 11:00 UTCJul 13, 11:45 UTC45m
2026-07-13 ABL8135 - Jul 13, 09:00 UTCJul 13, 09:15 UTC15m
2026-07-13 ABL181 - Jul 13, 04:00 UTCJul 13, 06:05 UTC2h 5m
2026-07-13 ABL182 - Jul 13, 00:40 UTCJul 13, 02:50 UTC2h 10m
2026-07-12 ABL773 PUS → PUS Jul 12, 12:10 UTCJul 12, 21:40 UTC9h 30m
2026-07-12 ABL792 - Jul 12, 10:15 UTCJul 12, 10:40 UTC25m
2026-07-12 ABL792 - Jul 12, 08:50 UTCJul 12, 09:15 UTC25m
2026-07-12 ABL791 PUS → TPE Jul 12, 05:35 UTCJul 12, 07:35 UTC2h 0m
2026-07-12 ABL111 - Jul 12, 02:30 UTCJul 12, 04:10 UTC1h 40m
2026-07-11 ABL112 PUS → NRT Jul 11, 23:20 UTCJul 12, 01:00 UTC1h 40m
2026-07-11 ABL782 PUS → PUS Jul 11, 11:25 UTCJul 11, 21:40 UTC10h 15m
2026-07-11 ABL181 - Jul 11, 04:05 UTCJul 11, 06:15 UTC2h 10m
2026-07-11 ABL182 PUS → CTS Jul 11, 00:35 UTCJul 11, 02:45 UTC2h 10m
2026-07-10 ABL773 PUS → PUS Jul 10, 13:35 UTCJul 10, 22:45 UTC9h 11m
2026-07-10 ABL792 - Jul 10, 10:20 UTCJul 10, 10:40 UTC20m
2026-07-10 ABL792 - Jul 10, 08:55 UTCJul 10, 09:20 UTC25m
2026-07-10 ABL791 PUS → TPE Jul 10, 05:30 UTCJul 10, 07:40 UTC2h 10m
2026-07-10 ABL111 - Jul 10, 02:20 UTCJul 10, 04:00 UTC1h 40m
2026-07-09 ABL112 PUS → NRT Jul 9, 23:05 UTCJul 10, 00:40 UTC1h 35m
2026-07-09 ABL181 - Jul 9, 04:00 UTCJul 9, 06:25 UTC2h 25m
2026-07-09 ABL182 PUS → CTS Jul 9, 00:35 UTCJul 9, 02:40 UTC2h 5m
2026-07-08 ABL773 PUS → PUS Jul 8, 12:15 UTCJul 8, 21:40 UTC9h 25m
2026-07-08 ABL792 - Jul 8, 10:25 UTCJul 8, 10:45 UTC20m
2026-07-08 ABL792 - Jul 8, 09:00 UTCJul 8, 09:25 UTC25m
2026-07-08 ABL791 PUS → TPE Jul 8, 05:35 UTCJul 8, 07:35 UTC2h 0m
2026-07-08 ABL111 NRT → PUS Jul 8, 02:35 UTCJul 8, 04:15 UTC1h 40m
2026-07-07 ABL112 PUS → NRT Jul 7, 23:15 UTCJul 8, 00:55 UTC1h 40m
2026-07-07 ABL726 - Jul 7, 20:50 UTCJul 7, 21:20 UTC30m
2026-07-07 ABL726 - Jul 7, 16:15 UTCJul 7, 19:45 UTC3h 30m
2026-07-07 ABL725 PUS → BKK Jul 7, 09:25 UTCJul 7, 14:30 UTC5h 5m
2026-07-07 ABL794 - Jul 7, 07:00 UTCJul 7, 07:30 UTC30m
2026-07-07 ABL794 - Jul 7, 05:35 UTCJul 7, 06:00 UTC25m
2026-07-07 ABL793 PUS → TPE Jul 7, 02:00 UTCJul 7, 03:55 UTC1h 55m
2026-07-06 ABL8803 GMP → PUS Jul 6, 22:35 UTCJul 6, 23:25 UTC50m
2026-07-06 ABL8012 - Jul 6, 11:00 UTCJul 6, 11:45 UTC45m
2026-07-06 ABL8135 - Jul 6, 09:05 UTCJul 6, 09:20 UTC15m
2026-07-06 ABL181 - Jul 6, 03:50 UTCJul 6, 06:20 UTC2h 30m
2026-07-06 ABL182 PUS → CTS Jul 6, 00:25 UTCJul 6, 02:30 UTC2h 5m
2026-07-05 ABL711 PUS → PUS Jul 5, 12:25 UTCJul 5, 21:35 UTC9h 10m
2026-07-05 ABL792 - Jul 5, 10:30 UTCJul 5, 10:45 UTC15m
2026-07-05 ABL792 - Jul 5, 08:55 UTCJul 5, 09:20 UTC25m
2026-07-05 ABL791 PUS → TPE Jul 5, 05:20 UTCJul 5, 07:15 UTC1h 55m
2026-07-05 ABL111 - Jul 5, 02:15 UTCJul 5, 03:55 UTC1h 40m

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 ABL781, ABL794, ABL793, ABL792, ABL726.