Apparatus

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sensors Mode-S transponder

71C099

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

Currently assigned to HL8099 · AIRBUS A-321

Hex
71C099
Octal
34340231
Decimal
7,454,873
Country
KR
Tail
HL8099
Type
A321
No current signal · last broadcast 16h ago
Flights observed
367
Distinct callsigns
20
Country
KR
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 71C099.

Country allocation

The ICAO 24-bit address 71C099 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
ABL163 - 38 2026-07-14
ABL165 - 34 2026-07-13
ABL164 - 34 2026-07-13
ABL166 - 33 2026-07-13
ABL172 - 31 2026-07-13
ABL171 - 31 2026-07-13
ABL176 - 30 2026-07-12
ABL175 - 30 2026-07-12
ABL3935 - 20 2026-07-12
ABL3945 - 18 2026-07-12
ABL8811 Air Busan 5 2026-05-07
ABL382 Air Busan 5 2026-05-05
ABL381 Air Busan 5 2026-05-05
ABL8040 Air Busan 4 2026-05-07
ABL793 Air Busan 4 2026-04-27
ABL8826 Air Busan 3 2026-05-07
ABL8021 Air Busan 3 2026-04-16
ABL134 Air Busan 3 2026-05-06
ABL133 Air Busan 3 2026-05-06
ABL8803 Air Busan 2 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ABL163 - Jul 14, 02:25 UTCJul 14, 04:20 UTC1h 55m
2026-07-13 ABL164 - Jul 13, 22:35 UTCJul 14, 00:30 UTC1h 55m
2026-07-13 ABL165 NRT → ICN Jul 13, 11:15 UTCJul 13, 13:15 UTC2h 0m
2026-07-13 ABL166 - Jul 13, 07:25 UTCJul 13, 09:40 UTC2h 15m
2026-07-13 ABL171 KIX → ICN Jul 13, 04:15 UTCJul 13, 05:40 UTC1h 25m
2026-07-13 ABL172 - Jul 13, 01:01 UTCJul 13, 02:30 UTC1h 30m
2026-07-12 ABL3945 HKG → ICN Jul 12, 17:30 UTCJul 12, 20:35 UTC3h 5m
2026-07-12 ABL3935 - Jul 12, 12:45 UTCJul 12, 15:50 UTC3h 5m
2026-07-12 ABL175 KIX → ICN Jul 12, 09:30 UTCJul 12, 10:50 UTC1h 20m
2026-07-12 ABL176 - Jul 12, 06:15 UTCJul 12, 07:31 UTC1h 15m
2026-07-12 ABL163 - Jul 12, 02:30 UTCJul 12, 04:25 UTC1h 55m
2026-07-11 ABL164 - Jul 11, 22:30 UTCJul 12, 00:25 UTC1h 55m
2026-07-11 ABL175 KIX → ICN Jul 11, 09:35 UTCJul 11, 11:00 UTC1h 25m
2026-07-11 ABL176 ICN → KIX Jul 11, 06:10 UTCJul 11, 07:35 UTC1h 25m
2026-07-11 ABL163 - Jul 11, 02:35 UTCJul 11, 04:25 UTC1h 50m
2026-07-10 ABL164 - Jul 10, 22:20 UTCJul 11, 00:10 UTC1h 50m
2026-07-10 ABL165 - Jul 10, 11:20 UTCJul 10, 13:20 UTC2h 0m
2026-07-10 ABL166 - Jul 10, 07:30 UTCJul 10, 09:25 UTC1h 55m
2026-07-10 ABL171 KIX → ICN Jul 10, 04:15 UTCJul 10, 05:40 UTC1h 25m
2026-07-10 ABL172 - Jul 10, 00:55 UTCJul 10, 02:20 UTC1h 25m
2026-07-09 ABL3945 - Jul 9, 17:40 UTCJul 9, 20:55 UTC3h 15m
2026-07-09 ABL3935 ICN → HKG Jul 9, 12:55 UTCJul 9, 16:10 UTC3h 15m
2026-07-09 ABL163 - Jul 9, 02:35 UTCJul 9, 04:35 UTC2h 0m
2026-07-08 ABL164 - Jul 8, 22:25 UTCJul 9, 00:20 UTC1h 55m
2026-07-08 ABL163 - Jul 8, 02:30 UTCJul 8, 04:30 UTC2h 0m
2026-07-07 ABL164 ICN → NRT Jul 7, 22:30 UTCJul 8, 00:20 UTC1h 50m
2026-07-07 ABL165 - Jul 7, 11:20 UTCJul 7, 13:15 UTC1h 55m
2026-07-07 ABL166 ICN → NRT Jul 7, 07:40 UTCJul 7, 09:35 UTC1h 55m
2026-07-07 ABL171 KIX → ICN Jul 7, 04:15 UTCJul 7, 05:40 UTC1h 25m
2026-07-07 ABL172 - Jul 7, 00:55 UTCJul 7, 02:15 UTC1h 20m
2026-07-06 ABL175 - Jul 6, 09:30 UTCJul 6, 11:00 UTC1h 30m
2026-07-06 ABL176 - Jul 6, 06:15 UTCJul 6, 07:45 UTC1h 30m
2026-07-06 ABL163 - Jul 6, 02:30 UTCJul 6, 04:40 UTC2h 10m
2026-07-05 ABL164 ICN → NRT Jul 5, 22:35 UTCJul 6, 00:25 UTC1h 50m
2026-07-05 ABL165 - Jul 5, 11:15 UTCJul 5, 13:25 UTC2h 10m
2026-07-05 ABL166 - Jul 5, 07:50 UTCJul 5, 09:40 UTC1h 50m
2026-07-05 ABL171 - Jul 5, 04:25 UTCJul 5, 05:50 UTC1h 25m
2026-07-05 ABL172 - Jul 5, 01:20 UTCJul 5, 02:40 UTC1h 20m
2026-07-04 ABL175 KIX → ICN Jul 4, 09:20 UTCJul 4, 10:40 UTC1h 20m
2026-07-04 ABL176 - Jul 4, 06:35 UTCJul 4, 07:55 UTC1h 20m
2026-07-04 ABL163 - Jul 4, 04:20 UTCJul 4, 04:55 UTC35m
2026-07-04 ABL163 - Jul 4, 02:45 UTCJul 4, 03:50 UTC1h 5m
2026-07-03 ABL164 ICN → NRT Jul 3, 22:30 UTCJul 4, 00:30 UTC2h 0m
2026-07-03 ABL165 - Jul 3, 11:15 UTCJul 3, 13:20 UTC2h 5m
2026-07-03 ABL166 - Jul 3, 07:40 UTCJul 3, 09:30 UTC1h 50m
2026-07-03 ABL171 KIX → ICN Jul 3, 04:20 UTCJul 3, 05:40 UTC1h 20m
2026-07-03 ABL172 - Jul 3, 01:05 UTCJul 3, 02:30 UTC1h 25m
2026-07-02 ABL3945 - Jul 2, 17:45 UTCJul 2, 21:00 UTC3h 15m
2026-07-02 ABL3935 ICN → HKG Jul 2, 12:50 UTCJul 2, 16:00 UTC3h 10m
2026-07-02 ABL163 - Jul 2, 02:30 UTCJul 2, 04:40 UTC2h 10m

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 HL8099 page for operator, model, and routing details .

Mode-S 71C099 frequently asked

What is Mode-S code 71C099?
71C099 is an ICAO 24-bit transponder address. Allocated to Korea, South. Assigned to HL8099.
Where is Mode-S 71C099 registered?
Mode-S code 71C099 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 71C099 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 71C099, octal 34340231, decimal 7,454,873.
What flights does 71C099 operate?
Mode-S 71C099 has broadcast 20 distinct callsigns, including ABL163, ABL165, ABL164, ABL166, ABL172.