Apparatus

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sensors Mode-S transponder

0AC3BA

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-4350

Hex
0AC3BA
Octal
02541672
Decimal
705,466
Country
CR
Tail
HK-4350
Type
JS32
No current signal · last broadcast 15h ago
Flights observed
65
Distinct callsigns
1
Country
CR
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 0AC3BA.

Country allocation

The ICAO 24-bit address 0AC3BA falls within the block assigned to Costa Rica (CR) by ICAO Annex 10, Volume III. Every aircraft registered in Costa Rica 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 1 distinct

Callsign Airline Flights Last seen
HK4350 - 65 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HK4350 - Jul 17, 17:44 UTCJul 17, 17:50 UTC5m
2026-07-17 HK4350 - Jul 17, 15:35 UTCJul 17, 15:40 UTC5m
2026-07-16 HK4350 - Jul 16, 21:55 UTCJul 16, 22:00 UTC5m
2026-07-16 HK4350 - Jul 16, 13:25 UTCJul 16, 13:40 UTC15m
2026-07-12 HK4350 - Jul 12, 18:50 UTCJul 12, 19:40 UTC50m
2026-07-12 HK4350 - Jul 12, 13:45 UTCJul 12, 14:20 UTC35m
2026-07-11 HK4350 - Jul 11, 20:25 UTCJul 11, 20:50 UTC25m
2026-07-11 HK4350 - Jul 11, 19:25 UTCJul 11, 19:45 UTC20m
2026-07-11 HK4350 - Jul 11, 17:50 UTCJul 11, 18:20 UTC30m
2026-07-11 HK4350 - Jul 11, 11:00 UTCJul 11, 12:00 UTC1h 0m
2026-07-10 HK4350 - Jul 10, 12:50 UTCJul 10, 12:55 UTC5m
2026-07-09 HK4350 - Jul 9, 22:00 UTCJul 9, 22:05 UTC5m
2026-07-05 HK4350 - Jul 5, 14:15 UTCJul 5, 14:45 UTC30m
2026-07-04 HK4350 - Jul 4, 21:20 UTCJul 4, 21:40 UTC20m
2026-07-04 HK4350 - Jul 4, 20:20 UTCJul 4, 20:40 UTC20m
2026-07-04 HK4350 - Jul 4, 18:50 UTCJul 4, 19:15 UTC25m
2026-06-28 HK4350 - Jun 28, 14:19 UTCJun 28, 14:50 UTC30m
2026-06-27 HK4350 - Jun 27, 20:59 UTCJun 27, 21:19 UTC20m
2026-06-27 HK4350 - Jun 27, 19:59 UTCJun 27, 20:19 UTC20m
2026-06-27 HK4350 - Jun 27, 18:15 UTCJun 27, 18:45 UTC30m
2026-06-21 HK4350 - Jun 21, 13:39 UTCJun 21, 14:15 UTC35m
2026-06-20 HK4350 - Jun 20, 19:40 UTCJun 20, 20:00 UTC20m
2026-06-20 HK4350 - Jun 20, 18:40 UTCJun 20, 18:59 UTC20m
2026-06-20 HK4350 - Jun 20, 16:39 UTCJun 20, 17:04 UTC25m
2026-06-19 HK4350 - Jun 19, 17:29 UTCJun 19, 17:39 UTC10m
2026-06-19 HK4350 - Jun 19, 12:59 UTCJun 19, 13:09 UTC10m
2026-06-18 HK4350 - Jun 18, 20:35 UTCJun 18, 20:45 UTC10m
2026-06-07 HK4350 - Jun 7, 19:15 UTCJun 7, 19:35 UTC20m
2026-06-07 HK4350 - Jun 7, 14:35 UTCJun 7, 15:10 UTC35m
2026-06-06 HK4350 - Jun 6, 20:39 UTCJun 6, 20:55 UTC15m
2026-06-06 HK4350 - Jun 6, 19:30 UTCJun 6, 19:54 UTC25m
2026-06-06 HK4350 - Jun 6, 17:44 UTCJun 6, 18:19 UTC35m
2026-06-06 HK4350 - Jun 6, 11:19 UTCJun 6, 11:55 UTC35m
2026-05-31 HK4350 - May 31, 18:20 UTCMay 31, 18:35 UTC15m
2026-05-31 HK4350 - May 31, 14:05 UTCMay 31, 14:30 UTC25m
2026-05-30 HK4350 - May 30, 19:05 UTCMay 30, 19:25 UTC20m
2026-05-30 HK4350 - May 30, 18:00 UTCMay 30, 18:20 UTC20m
2026-05-30 HK4350 - May 30, 16:20 UTCMay 30, 16:45 UTC25m
2026-05-16 HK4350 - May 16, 18:45 UTCMay 16, 19:00 UTC15m
2026-05-16 HK4350 - May 16, 13:35 UTCMay 16, 14:05 UTC30m
2026-05-15 HK4350 - May 15, 21:55 UTCMay 15, 22:15 UTC20m
2026-05-15 HK4350 - May 15, 21:00 UTCMay 15, 21:20 UTC20m
2026-05-15 HK4350 - May 15, 19:50 UTCMay 15, 20:25 UTC35m
2026-05-15 HK4350 - May 15, 15:00 UTCMay 15, 15:15 UTC15m
2026-05-10 HK4350 - May 10, 13:25 UTCMay 10, 13:55 UTC30m
2026-05-09 HK4350 - May 9, 20:10 UTCMay 9, 20:30 UTC20m
2026-05-09 HK4350 - May 9, 19:05 UTCMay 9, 19:30 UTC25m
2026-05-09 HK4350 - May 9, 17:00 UTCMay 9, 17:35 UTC35m
2026-05-03 HK4350 - May 3, 14:45 UTCMay 3, 15:15 UTC30m
2026-05-02 HK4350 - May 2, 19:55 UTCMay 2, 20:10 UTC15m

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 HK-4350 page for operator, model, and routing details .

Mode-S 0AC3BA frequently asked

What is Mode-S code 0AC3BA?
0AC3BA is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-4350.
Where is Mode-S 0AC3BA registered?
Mode-S code 0AC3BA is allocated to Costa Rica (CR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0AC3BA broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC3BA, octal 02541672, decimal 705,466.
What flights does 0AC3BA operate?
Mode-S 0AC3BA has broadcast 1 distinct callsign, including HK4350.