Apparatus

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sensors Mode-S transponder

0AC3C0

ICAO 24-bit transponder address · allocated to Costa Rica

Hex
0AC3C0
Octal
02541700
Decimal
705,472
Country
CR
No current signal · last broadcast 7d ago
Flights observed
41
Distinct callsigns
1
Country
CR
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S 0AC3C0.

Country allocation

The ICAO 24-bit address 0AC3C0 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
HK4384 - 41 2026-07-26

Recent flights last 41

DateFlightRouteTakeoffLandingDuration
2026-07-26 HK4384 - Jul 26, 12:15 UTCJul 26, 12:25 UTC10m
2026-07-26 HK4384 EOH → EOH Jul 26, 11:05 UTCJul 26, 11:30 UTC25m
2026-07-25 HK4384 - Jul 25, 15:25 UTCJul 25, 15:35 UTC10m
2026-07-25 HK4384 - Jul 25, 14:05 UTCJul 25, 14:20 UTC15m
2026-07-25 HK4384 - Jul 25, 11:40 UTCJul 25, 11:50 UTC10m
2026-07-24 HK4384 - Jul 24, 17:50 UTCJul 24, 18:05 UTC15m
2026-07-24 HK4384 - Jul 24, 15:05 UTCJul 24, 15:15 UTC10m
2026-07-24 HK4384 - Jul 24, 13:50 UTCJul 24, 14:00 UTC10m
2026-07-23 HK4384 - Jul 23, 19:05 UTCJul 23, 19:25 UTC20m
2026-07-23 HK4384 - Jul 23, 13:15 UTCJul 23, 13:25 UTC10m
2026-07-21 HK4384 - Jul 21, 15:00 UTCJul 21, 15:10 UTC10m
2026-07-21 HK4384 - Jul 21, 13:05 UTCJul 21, 13:15 UTC10m
2026-07-19 HK4384 - Jul 19, 18:35 UTCJul 19, 18:45 UTC10m
2026-07-18 HK4384 - Jul 18, 17:45 UTCJul 18, 17:55 UTC10m
2026-07-18 HK4384 - Jul 18, 15:25 UTCJul 18, 16:10 UTC45m
2026-07-18 HK4384 - Jul 18, 12:15 UTCJul 18, 13:05 UTC50m
2026-07-17 HK4384 - Jul 17, 20:29 UTCJul 17, 20:40 UTC10m
2026-07-16 HK4384 - Jul 16, 20:00 UTCJul 16, 20:09 UTC10m
2026-07-16 HK4384 - Jul 16, 18:10 UTCJul 16, 18:19 UTC10m
2026-07-15 HK4384 - Jul 15, 18:20 UTCJul 15, 18:30 UTC10m
2026-07-15 HK4384 - Jul 15, 15:40 UTCJul 15, 15:45 UTC5m
2026-07-15 HK4384 - Jul 15, 12:45 UTCJul 15, 12:55 UTC10m
2026-07-14 HK4384 - Jul 14, 20:55 UTCJul 14, 21:05 UTC10m
2026-07-14 HK4384 - Jul 14, 18:25 UTCJul 14, 18:40 UTC15m
2026-07-13 HK4384 - Jul 13, 12:20 UTCJul 13, 12:35 UTC15m
2026-07-12 HK4384 - Jul 12, 21:25 UTCJul 12, 21:35 UTC10m
2026-07-11 HK4384 - Jul 11, 13:55 UTCJul 11, 14:00 UTC5m
2026-07-11 HK4384 - Jul 11, 12:35 UTCJul 11, 12:50 UTC15m
2026-07-10 HK4384 - Jul 10, 22:45 UTCJul 10, 22:55 UTC10m
2026-07-10 HK4384 - Jul 10, 14:35 UTCJul 10, 14:45 UTC10m
2026-07-10 HK4384 - Jul 10, 12:50 UTCJul 10, 13:00 UTC10m
2026-07-09 HK4384 - Jul 9, 22:45 UTCJul 9, 22:55 UTC10m
2026-07-09 HK4384 - Jul 9, 14:30 UTCJul 9, 14:40 UTC10m
2026-06-20 HK4384 - Jun 20, 11:09 UTCJun 20, 11:20 UTC10m
2026-06-19 HK4384 - Jun 19, 15:49 UTCJun 19, 15:59 UTC10m
2026-06-18 HK4384 - Jun 18, 18:00 UTCJun 18, 18:10 UTC10m
2026-06-18 HK4384 - Jun 18, 15:45 UTCJun 18, 15:55 UTC10m
2026-06-18 HK4384 - Jun 18, 14:40 UTCJun 18, 14:50 UTC10m
2026-06-18 HK4384 - Jun 18, 12:55 UTCJun 18, 13:05 UTC10m
2026-06-17 HK4384 - Jun 17, 17:55 UTCJun 17, 18:05 UTC10m
2026-06-17 HK4384 - Jun 17, 14:25 UTCJun 17, 14:35 UTC10m

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.

Mode-S 0AC3C0 frequently asked

What is Mode-S code 0AC3C0?
0AC3C0 is an ICAO 24-bit transponder address. Allocated to Costa Rica.
Where is Mode-S 0AC3C0 registered?
Mode-S code 0AC3C0 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 0AC3C0 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC3C0, octal 02541700, decimal 705,472.
What flights does 0AC3C0 operate?
Mode-S 0AC3C0 has broadcast 1 distinct callsign, including HK4384.