Apparatus

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sensors Mode-S transponder

71C255

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

Currently assigned to HL8255 · AIRBUS A-321

Hex
71C255
Octal
34341125
Decimal
7,455,317
Country
KR
Tail
HL8255
Type
A321
Broadcasting now · callsign ASV704 · 19,025 ft
Flights observed
410
Distinct callsigns
20
Country
KR
Last broadcast
1h ago

Current position

71C255 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 71C255 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
ASV712 - 25 2026-07-11
ASV711 - 25 2026-07-10
ASV714 - 22 2026-07-10
ASV713 - 22 2026-07-10
ASV715 - 19 2026-07-13
ASV724 - 18 2026-07-12
ASV716 - 18 2026-07-13
ASV705 - 18 2026-07-12
ASV702 - 18 2026-07-14
ASV701 - 18 2026-07-14
ASV728 - 17 2026-07-11
ASV723 - 17 2026-07-11
ASV706 - 17 2026-07-13
ASV102 - 17 2026-07-11
ASV727 - 16 2026-07-11
ASV703 - 16 2026-07-14
ASV704 - 14 2026-07-09
ASV742 - 12 2026-07-04
ASV528 - 12 2026-06-28
ASV746 - 11 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASV703 ICN → NRT Jul 14, 08:05 UTCJul 14, 10:00 UTC1h 55m
2026-07-14 ASV702 - Jul 14, 04:15 UTCJul 14, 06:20 UTC2h 5m
2026-07-14 ASV701 - Jul 14, 00:35 UTCJul 14, 02:35 UTC2h 0m
2026-07-13 ASV512 - Jul 13, 12:20 UTCJul 13, 22:00 UTC9h 40m
2026-07-13 ASV716 - Jul 13, 09:15 UTCJul 13, 10:40 UTC1h 25m
2026-07-13 ASV715 - Jul 13, 06:40 UTCJul 13, 07:55 UTC1h 15m
2026-07-13 ASV706 - Jul 13, 03:05 UTCJul 13, 05:05 UTC2h 0m
2026-07-12 ASV705 - Jul 12, 23:30 UTCJul 13, 01:25 UTC1h 55m
2026-07-12 ASV718 - Jul 12, 13:10 UTCJul 12, 14:25 UTC1h 15m
2026-07-12 ASV717 - Jul 12, 10:30 UTCJul 12, 11:50 UTC1h 20m
2026-07-12 ASV746 - Jul 12, 07:10 UTCJul 12, 08:10 UTC1h 0m
2026-07-12 ASV745 - Jul 12, 04:40 UTCJul 12, 05:10 UTC30m
2026-07-12 ASV724 - Jul 12, 01:40 UTCJul 12, 02:45 UTC1h 5m
2026-07-11 ASV723 - Jul 11, 23:15 UTCJul 11, 23:55 UTC40m
2026-07-11 ASV102 ICN → ICN Jul 11, 12:00 UTCJul 11, 21:40 UTC9h 40m
2026-07-11 ASV728 - Jul 11, 08:15 UTCJul 11, 09:05 UTC50m
2026-07-11 ASV727 - Jul 11, 05:40 UTCJul 11, 06:40 UTC1h 0m
2026-07-11 ASV712 KIX → ICN Jul 11, 01:25 UTCJul 11, 02:45 UTC1h 20m
2026-07-10 ASV711 - Jul 10, 22:25 UTCJul 10, 23:45 UTC1h 20m
2026-07-10 ASV102 - Jul 10, 10:45 UTCJul 10, 20:15 UTC9h 30m
2026-07-10 ASV714 KIX → ICN Jul 10, 07:35 UTCJul 10, 09:00 UTC1h 25m
2026-07-10 ASV713 - Jul 10, 04:30 UTCJul 10, 06:05 UTC1h 35m
2026-07-10 ASV712 KIX → ICN Jul 10, 01:20 UTCJul 10, 03:10 UTC1h 50m
2026-07-09 ASV711 ICN → KIX Jul 9, 22:30 UTCJul 9, 23:55 UTC1h 25m
2026-07-09 ASV704 - Jul 9, 11:30 UTCJul 9, 13:30 UTC2h 0m
2026-07-09 ASV703 - Jul 9, 08:15 UTCJul 9, 10:05 UTC1h 50m
2026-07-09 ASV702 - Jul 9, 04:30 UTCJul 9, 06:35 UTC2h 5m
2026-07-09 ASV701 - Jul 9, 00:40 UTCJul 9, 02:35 UTC1h 55m
2026-07-08 ASV102 - Jul 8, 10:35 UTCJul 8, 20:25 UTC9h 50m
2026-07-08 ASV714 KIX → ICN Jul 8, 07:25 UTCJul 8, 08:50 UTC1h 25m
2026-07-08 ASV713 - Jul 8, 04:30 UTCJul 8, 06:00 UTC1h 30m
2026-07-08 ASV712 KIX → ICN Jul 8, 01:20 UTCJul 8, 02:45 UTC1h 25m
2026-07-07 ASV711 - Jul 7, 22:25 UTCJul 7, 23:50 UTC1h 25m
2026-07-07 ASV704 - Jul 7, 11:40 UTCJul 7, 13:35 UTC1h 55m
2026-07-07 ASV703 ICN → NRT Jul 7, 08:00 UTCJul 7, 09:55 UTC1h 55m
2026-07-07 ASV702 - Jul 7, 04:05 UTCJul 7, 06:15 UTC2h 10m
2026-07-07 ASV701 - Jul 7, 00:40 UTCJul 7, 02:35 UTC1h 55m
2026-07-06 ASV512 - Jul 6, 12:25 UTCJul 6, 22:05 UTC9h 40m
2026-07-06 ASV714 KIX → ICN Jul 6, 07:30 UTCJul 6, 09:00 UTC1h 30m
2026-07-06 ASV713 ICN → KIX Jul 6, 04:40 UTCJul 6, 06:05 UTC1h 25m
2026-07-06 ASV724 - Jul 6, 01:45 UTCJul 6, 02:50 UTC1h 5m
2026-07-05 ASV723 - Jul 5, 23:20 UTCJul 6, 00:10 UTC50m
2026-07-05 ASV704 - Jul 5, 11:35 UTCJul 5, 13:45 UTC2h 10m
2026-07-05 ASV703 - Jul 5, 08:05 UTCJul 5, 09:55 UTC1h 50m
2026-07-05 ASV702 - Jul 5, 04:20 UTCJul 5, 06:25 UTC2h 5m
2026-07-05 ASV701 - Jul 5, 01:05 UTCJul 5, 02:50 UTC1h 45m
2026-07-04 ASV527 ICN → ICN Jul 4, 11:50 UTCJul 4, 22:35 UTC10h 45m
2026-07-04 ASV728 - Jul 4, 08:15 UTCJul 4, 09:10 UTC55m
2026-07-04 ASV727 - Jul 4, 05:45 UTCJul 4, 06:30 UTC45m
2026-07-04 ASV742 - Jul 4, 02:40 UTCJul 4, 04:00 UTC1h 20m

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 HL8255 page for operator, model, and routing details .

Mode-S 71C255 frequently asked

What is Mode-S code 71C255?
71C255 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8255.
Where is Mode-S 71C255 registered?
Mode-S code 71C255 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 71C255 broadcasting right now?
Yes. Mode-S 71C255 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C255, octal 34341125, decimal 7,455,317.
What flights does 71C255 operate?
Mode-S 71C255 has broadcast 20 distinct callsigns, including ASV712, ASV711, ASV714, ASV713, ASV715.