Apparatus

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sensors Mode-S transponder

0AC3FA

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5279 · BEECH 90 King Air

Hex
0AC3FA
Octal
02541772
Decimal
705,530
Country
CR
Tail
HK-5279
Type
BE9L
No current signal · last broadcast 2h ago
Flights observed
53
Distinct callsigns
1
Country
CR
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 0AC3FA.

Country allocation

The ICAO 24-bit address 0AC3FA 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
HK5279 - 53 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 HK5279 - Jun 29, 14:50 UTCJun 29, 15:30 UTC40m
2026-06-28 HK5279 - Jun 28, 23:20 UTCJun 28, 23:34 UTC15m
2026-06-27 HK5279 - Jun 27, 16:10 UTCJun 27, 16:24 UTC15m
2026-06-26 HK5279 - Jun 26, 20:00 UTCJun 26, 20:59 UTC1h 0m
2026-06-26 HK5279 - Jun 26, 18:39 UTCJun 26, 19:04 UTC25m
2026-06-26 HK5279 - Jun 26, 17:40 UTCJun 26, 17:59 UTC20m
2026-06-25 HK5279 - Jun 25, 16:50 UTCJun 25, 17:14 UTC25m
2026-06-25 HK5279 - Jun 25, 15:50 UTCJun 25, 16:09 UTC20m
2026-06-22 HK5279 ADZ → ADZ Jun 22, 17:00 UTCJun 22, 18:04 UTC1h 5m
2026-06-22 HK5279 - Jun 22, 12:54 UTCJun 22, 13:14 UTC20m
2026-06-22 HK5279 - Jun 22, 11:54 UTCJun 22, 12:15 UTC20m
2026-06-21 HK5279 - Jun 21, 16:19 UTCJun 21, 16:39 UTC20m
2026-06-21 HK5279 - Jun 21, 15:05 UTCJun 21, 15:15 UTC10m
2026-06-20 HK5279 - Jun 20, 18:10 UTCJun 20, 19:04 UTC55m
2026-06-20 HK5279 - Jun 20, 16:09 UTCJun 20, 16:49 UTC40m
2026-06-19 HK5279 - Jun 19, 20:34 UTCJun 19, 20:59 UTC25m
2026-06-19 HK5279 - Jun 19, 14:19 UTCJun 19, 14:34 UTC15m
2026-06-18 HK5279 - Jun 18, 21:25 UTCJun 18, 21:50 UTC25m
2026-06-18 HK5279 - Jun 18, 18:50 UTCJun 18, 19:40 UTC50m
2026-06-18 HK5279 - Jun 18, 16:50 UTCJun 18, 17:35 UTC45m
2026-06-17 HK5279 - Jun 17, 17:15 UTCJun 17, 17:35 UTC20m
2026-06-17 HK5279 BOG → BOG Jun 17, 13:25 UTCJun 17, 14:05 UTC40m
2026-06-09 HK5279 - Jun 9, 22:25 UTCJun 9, 22:45 UTC20m
2026-06-08 HK5279 - Jun 8, 20:45 UTCJun 8, 21:00 UTC15m
2026-06-08 HK5279 - Jun 8, 19:20 UTCJun 8, 19:40 UTC20m
2026-06-07 HK5279 - Jun 7, 15:50 UTCJun 7, 16:40 UTC50m
2026-06-07 HK5279 - Jun 7, 13:50 UTCJun 7, 14:30 UTC40m
2026-06-07 HK5279 - Jun 7, 11:35 UTCJun 7, 11:55 UTC20m
2026-06-06 HK5279 - Jun 6, 21:44 UTCJun 6, 22:20 UTC35m
2026-06-05 HK5279 - Jun 5, 22:30 UTCJun 5, 22:45 UTC15m
2026-06-05 HK5279 - Jun 5, 16:15 UTCJun 5, 16:30 UTC15m
2026-06-05 HK5279 - Jun 5, 14:15 UTCJun 5, 14:35 UTC20m
2026-06-03 HK5279 - Jun 3, 20:45 UTCJun 3, 21:00 UTC15m
2026-06-02 HK5279 - Jun 2, 16:20 UTCJun 2, 16:30 UTC10m
2026-06-01 HK5279 - Jun 1, 20:40 UTCJun 1, 20:55 UTC15m
2026-05-31 HK5279 - May 31, 16:55 UTCMay 31, 17:05 UTC10m
2026-05-31 HK5279 - May 31, 11:50 UTCMay 31, 12:05 UTC15m
2026-05-29 HK5279 - May 29, 22:15 UTCMay 29, 22:30 UTC15m
2026-05-28 HK5279 - May 28, 16:45 UTCMay 28, 17:05 UTC20m
2026-05-28 HK5279 BOG → BOG May 28, 13:20 UTCMay 28, 14:15 UTC55m
2026-05-20 HK5279 - May 20, 19:15 UTCMay 20, 19:30 UTC15m
2026-05-18 HK5279 - May 18, 18:20 UTCMay 18, 18:35 UTC14m
2026-05-17 HK5279 - May 17, 18:10 UTCMay 17, 18:45 UTC35m
2026-05-17 HK5279 - May 17, 14:45 UTCMay 17, 14:55 UTC10m
2026-05-16 HK5279 - May 16, 20:20 UTCMay 16, 20:35 UTC15m
2026-05-16 HK5279 - May 16, 18:20 UTCMay 16, 18:45 UTC25m
2026-05-16 HK5279 - May 16, 17:20 UTCMay 16, 17:30 UTC10m
2026-05-15 HK5279 - May 15, 19:05 UTCMay 15, 19:20 UTC15m
2026-05-15 HK5279 ADZ → ADZ May 15, 12:05 UTCMay 15, 13:15 UTC1h 10m
2026-05-14 HK5279 - May 14, 20:55 UTCMay 14, 21:10 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-5279 page for operator, model, and routing details .

Mode-S 0AC3FA frequently asked

What is Mode-S code 0AC3FA?
0AC3FA is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5279.
Where is Mode-S 0AC3FA registered?
Mode-S code 0AC3FA 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 0AC3FA 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 0AC3FA, octal 02541772, decimal 705,530.
What flights does 0AC3FA operate?
Mode-S 0AC3FA has broadcast 1 distinct callsign, including HK5279.