Apparatus

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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 2h ago
Flights observed
308
Distinct callsigns
20
Country
KR
Last broadcast
2h 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 - 17 2026-07-18
ABL8040 - 11 2026-07-18
ABL796 - 10 2026-06-28
ABL8826 - 9 2026-07-12
ABL795 - 9 2026-06-28
ABL121 - 9 2026-07-16
ABL8872 - 8 2026-07-12
ABL8823 - 8 2026-07-18
ABL773 - 8 2026-07-18
ABL337 Air Busan 8 2026-07-17
ABL1325 Air Busan 8 2026-07-17
ABL1315 - 8 2026-07-17
ABL122 - 8 2026-07-16
ABL8111 - 7 2026-07-18
ABL8110 Air Busan 7 2026-07-18
ABL147 - 7 2026-07-16
ABL143 - 7 2026-07-07
ABL126 - 7 2026-07-16
ABL125 - 7 2026-07-16
ABL8820 - 6 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 ABL773 - Jul 18, 13:40 UTCJul 18, 14:45 UTC1h 5m
2026-07-18 ABL773 - Jul 18, 12:15 UTCJul 18, 12:35 UTC20m
2026-07-18 ABL8823 - Jul 18, 09:55 UTCJul 18, 10:35 UTC40m
2026-07-18 ABL8820 PUS → GMP Jul 18, 08:15 UTCJul 18, 09:00 UTC45m
2026-07-18 ABL8110 CJU → PUS Jul 18, 06:45 UTCJul 18, 07:10 UTC25m
2026-07-18 ABL8111 - Jul 18, 04:40 UTCJul 18, 05:00 UTC20m
2026-07-18 ABL8811 GMP → PUS Jul 18, 02:55 UTCJul 18, 03:30 UTC35m
2026-07-18 ABL8040 - Jul 18, 01:00 UTCJul 18, 01:39 UTC40m
2026-07-17 ABL8107 - Jul 17, 22:55 UTCJul 17, 23:10 UTC15m
2026-07-17 ABL1315 - Jul 17, 11:04 UTCJul 17, 12:25 UTC1h 20m
2026-07-17 ABL1325 PUS → TAK Jul 17, 09:04 UTCJul 17, 09:50 UTC45m
2026-07-17 ABL337 PUS → YNJ Jul 17, 01:00 UTCJul 17, 07:25 UTC6h 25m
2026-07-16 ABL121 - Jul 16, 10:25 UTCJul 16, 11:25 UTC1h 0m
2026-07-16 ABL122 PUS → KIX Jul 16, 07:45 UTCJul 16, 08:55 UTC1h 10m
2026-07-16 ABL125 KIX → PUS Jul 16, 05:20 UTCJul 16, 06:20 UTC1h 0m
2026-07-16 ABL126 PUS → KIX Jul 16, 02:45 UTCJul 16, 03:50 UTC1h 5m
2026-07-16 ABL147 - Jul 16, 00:35 UTCJul 16, 01:10 UTC35m
2026-07-15 ABL148 - Jul 15, 22:45 UTCJul 15, 23:05 UTC20m
2026-07-15 ABL121 KIX → PUS Jul 15, 10:35 UTCJul 15, 11:45 UTC1h 10m
2026-07-15 ABL1645 - Jul 15, 00:40 UTCJul 15, 01:55 UTC1h 15m
2026-07-14 ABL1315 - Jul 14, 10:30 UTCJul 14, 11:30 UTC1h 0m
2026-07-14 ABL1325 - Jul 14, 08:25 UTCJul 14, 09:15 UTC50m
2026-07-14 ABL321 PUS → PUS Jul 14, 01:50 UTCJul 14, 06:20 UTC4h 30m
2026-07-13 ABL121 KIX → PUS Jul 13, 10:15 UTCJul 13, 11:20 UTC1h 5m
2026-07-13 ABL122 PUS → KIX Jul 13, 07:45 UTCJul 13, 08:50 UTC1h 5m
2026-07-12 ABL8025 - Jul 12, 23:15 UTCJul 12, 23:50 UTC35m
2026-07-12 ABL8826 PUS → GMP Jul 12, 11:55 UTCJul 12, 12:30 UTC35m
2026-07-12 ABL8823 GMP → PUS Jul 12, 10:20 UTCJul 12, 11:01 UTC40m
2026-07-12 ABL8820 PUS → GMP Jul 12, 08:45 UTCJul 12, 09:25 UTC40m
2026-07-12 ABL8110 - Jul 12, 07:20 UTCJul 12, 07:40 UTC20m
2026-07-12 ABL8111 - Jul 12, 05:10 UTCJul 12, 05:30 UTC20m
2026-07-12 ABL8811 GMP → PUS Jul 12, 03:30 UTCJul 12, 04:10 UTC40m
2026-07-12 ABL8872 PUS → GMP Jul 12, 01:20 UTCJul 12, 02:05 UTC45m
2026-07-11 ABL762 - Jul 11, 23:05 UTCJul 11, 23:25 UTC20m
2026-07-11 ABL762 - Jul 11, 19:00 UTCJul 11, 22:20 UTC3h 20m
2026-07-11 ABL761 PUS → BKI Jul 11, 13:05 UTCJul 11, 17:45 UTC4h 40m
2026-07-11 ABL126 PUS → KIX Jul 11, 02:35 UTCJul 11, 03:45 UTC1h 10m
2026-07-11 ABL8106 - Jul 11, 00:35 UTCJul 11, 00:50 UTC15m
2026-07-10 ABL8025 - Jul 10, 22:30 UTCJul 10, 23:10 UTC40m
2026-07-10 ABL8135 - Jul 10, 10:00 UTCJul 10, 10:15 UTC15m
2026-07-10 ABL8132 - Jul 10, 08:45 UTCJul 10, 09:00 UTC15m
2026-07-10 ABL8021 - Jul 10, 06:30 UTCJul 10, 07:05 UTC35m
2026-07-10 ABL8028 - Jul 10, 04:45 UTCJul 10, 05:30 UTC45m
2026-07-10 ABL8109 - Jul 10, 02:45 UTCJul 10, 03:05 UTC20m
2026-07-10 ABL8102 - Jul 10, 01:05 UTCJul 10, 01:20 UTC15m
2026-07-09 ABL8105 - Jul 9, 23:05 UTCJul 9, 23:25 UTC20m
2026-07-09 ABL121 KIX → PUS Jul 9, 10:25 UTCJul 9, 11:40 UTC1h 15m
2026-07-09 ABL122 PUS → KIX Jul 9, 08:00 UTCJul 9, 09:10 UTC1h 10m
2026-07-09 ABL125 KIX → PUS Jul 9, 05:30 UTCJul 9, 06:50 UTC1h 20m
2026-07-09 ABL147 - Jul 9, 00:35 UTCJul 9, 01:10 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 2h 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, ABL8040, ABL796, ABL8826, ABL795.