Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

71C256

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

Currently assigned to HL8256 · AIRBUS A-321

Hex
71C256
Octal
34341126
Decimal
7,455,318
Country
KR
Tail
HL8256
Type
A321
No current signal · last broadcast 23h ago
Flights observed
109
Distinct callsigns
20
Country
KR
Last broadcast
23h ago

Last known position

Most recent position reported by Mode-S 71C256.

Country allocation

The ICAO 24-bit address 71C256 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
ABL8811 Air Busan 6 2026-05-26
ABL337 Air Busan 6 2026-05-30
ABL8823 Air Busan 5 2026-05-18
ABL773 Air Busan 5 2026-05-29
ABL321 Air Busan 5 2026-05-29
ABL1325 Air Busan 5 2026-05-22
ABL1315 Air Busan 5 2026-05-22
ABL8040 Air Busan 4 2026-05-26
ABL133 Air Busan 4 2026-05-31
ABL124 Air Busan 4 2026-05-09
ABL123 Air Busan 4 2026-05-10
ABL8826 Air Busan 3 2026-06-02
ABL8820 Air Busan 3 2026-05-18
ABL8812 Air Busan 3 2026-04-26
ABL338 Air Busan 3 2026-05-25
ABL134 Air Busan 3 2026-05-17
ABL8872 Air Busan 2 2026-05-24
ABL8818 Air Busan 2 2026-05-28
ABL8817 Air Busan 2 2026-05-28
ABL8804 Air Busan 2 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 ABL8826 PUS → GMP Jun 2, 11:35 UTCJun 2, 12:05 UTC30m
2026-06-02 ABL796 KHH → PUS Jun 2, 06:25 UTCJun 2, 07:05 UTC40m
2026-06-02 ABL795 PUS → KHH Jun 2, 04:05 UTCJun 2, 05:00 UTC55m
2026-05-31 ABL133 MYJ → PUS May 31, 09:50 UTCMay 31, 10:00 UTC10m
2026-05-30 ABL337 PUS → YNJ May 30, 00:55 UTCMay 30, 06:45 UTC5h 50m
2026-05-29 ABL773 PUS → DAD May 29, 13:55 UTCMay 29, 21:30 UTC7h 35m
2026-05-29 ABL321 PUS → TAO May 29, 01:50 UTCMay 29, 05:55 UTC4h 5m
2026-05-28 ABL8019 GMP → CJU May 28, 09:10 UTCMay 28, 09:35 UTC25m
2026-05-28 ABL8818 PUS → GMP May 28, 07:40 UTCMay 28, 08:10 UTC30m
2026-05-28 ABL8817 GMP → PUS May 28, 05:40 UTCMay 28, 06:10 UTC30m
2026-05-28 ABL8804 PUS → GMP May 28, 00:25 UTCMay 28, 00:55 UTC30m
2026-05-27 ABL8817 GMP → PUS May 27, 05:45 UTCMay 27, 06:09 UTC25m
2026-05-27 ABL8808 PUS → GMP May 27, 04:04 UTCMay 27, 04:45 UTC40m
2026-05-27 ABL8809 GMP → PUS May 27, 02:04 UTCMay 27, 02:34 UTC30m
2026-05-27 ABL8804 PUS → GMP May 27, 00:25 UTCMay 27, 00:59 UTC35m
2026-05-26 ABL8811 GMP → PUS May 26, 02:55 UTCMay 26, 03:25 UTC30m
2026-05-26 ABL8040 CJU → GMP May 26, 01:30 UTCMay 26, 02:00 UTC30m
2026-05-25 ABL338 YNJ → PUS May 25, 06:10 UTCMay 25, 06:40 UTC30m
2026-05-24 ABL8811 GMP → PUS May 24, 03:05 UTCMay 24, 03:30 UTC25m
2026-05-24 ABL8872 PUS → GMP May 24, 01:05 UTCMay 24, 01:45 UTC40m
2026-05-23 ABL773 PUS → DAD May 23, 13:45 UTCMay 23, 14:40 UTC55m
2026-05-23 ABL8021 GMP → CJU May 23, 06:40 UTCMay 23, 07:10 UTC30m
2026-05-23 ABL8028 CJU → GMP May 23, 04:55 UTCMay 23, 05:30 UTC35m
2026-05-22 ABL1315 TAK → PUS May 22, 10:45 UTCMay 22, 11:05 UTC20m
2026-05-22 ABL1325 PUS → TAK May 22, 08:55 UTCMay 22, 09:25 UTC30m
2026-05-22 ABL338 YNJ → PUS May 22, 06:15 UTCMay 22, 06:45 UTC30m
2026-05-21 ABL8019 GMP → CJU May 21, 09:00 UTCMay 21, 09:25 UTC25m
2026-05-21 ABL8818 PUS → GMP May 21, 07:30 UTCMay 21, 08:00 UTC30m
2026-05-21 ABL322 TAO → PUS May 21, 05:20 UTCMay 21, 05:55 UTC35m
2026-05-19 ABL381 PUS → MFM May 19, 14:55 UTCMay 19, 16:30 UTC1h 35m
2026-05-19 ABL111 NRT → PUS May 19, 02:10 UTCMay 19, 03:20 UTC1h 10m
2026-05-18 ABL112 PUS → NRT May 18, 23:25 UTCMay 19, 00:45 UTC1h 20m
2026-05-18 ABL8823 GMP → PUS May 18, 09:55 UTCMay 18, 10:15 UTC20m
2026-05-18 ABL8820 PUS → GMP May 18, 08:25 UTCMay 18, 08:55 UTC30m
2026-05-18 ABL337 PUS → YNJ May 18, 00:55 UTCMay 18, 06:50 UTC5h 55m
2026-05-17 ABL8803 GMP → PUS May 17, 22:40 UTCMay 17, 23:05 UTC25m
2026-05-17 ABL8824 PUS → GMP May 17, 11:50 UTCMay 17, 12:20 UTC30m
2026-05-17 ABL133 MYJ → PUS May 17, 09:40 UTCMay 17, 09:55 UTC15m
2026-05-17 ABL134 PUS → MYJ May 17, 08:10 UTCMay 17, 08:20 UTC10m
2026-05-17 ABL321 PUS → TAO May 17, 01:45 UTCMay 17, 05:55 UTC4h 10m
2026-05-16 ABL8811 GMP → PUS May 16, 02:50 UTCMay 16, 03:20 UTC30m
2026-05-16 ABL8040 CJU → GMP May 16, 01:20 UTCMay 16, 01:45 UTC25m
2026-05-15 ABL133 MYJ → PUS May 15, 10:00 UTCMay 15, 10:15 UTC15m
2026-05-15 ABL134 PUS → MYJ May 15, 08:10 UTCMay 15, 08:25 UTC15m
2026-05-15 ABL321 PUS → TAO May 15, 01:50 UTCMay 15, 06:00 UTC4h 10m
2026-05-13 ABL143 FUK → PUS May 13, 11:05 UTCMay 13, 11:15 UTC10m
2026-05-13 ABL145 FUK → PUS May 13, 07:10 UTCMay 13, 07:20 UTC10m
2026-05-12 ABL796 KHH → PUS May 12, 06:20 UTCMay 12, 07:10 UTC50m
2026-05-11 ABL337 PUS → YNJ May 11, 00:54 UTCMay 11, 06:35 UTC5h 40m
2026-05-10 ABL123 KIX → PUS May 10, 02:24 UTCMay 10, 03:00 UTC35m

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 HL8256 page for operator, model, and routing details .

Mode-S 71C256 frequently asked

What is Mode-S code 71C256?
71C256 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8256.
Where is Mode-S 71C256 registered?
Mode-S code 71C256 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 71C256 broadcasting right now?
No active broadcast right now. Last signal was 23h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C256, octal 34341126, decimal 7,455,318.
What flights does 71C256 operate?
Mode-S 71C256 has broadcast 20 distinct callsigns, including ABL8811, ABL337, ABL8823, ABL773, ABL321.