Apparatus

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sensors Mode-S transponder

0AC415

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-2399G · PIPER PA-28-140/150/160/180

Hex
0AC415
Octal
02542025
Decimal
705,557
Country
CR
Tail
HK-2399G
Type
P28A
No current signal · last broadcast Jul 23, 17:10 UTC
Flights observed
21
Distinct callsigns
1
Country
CR
Last broadcast
Jul 23, 17:10 UTC

Last known position

Most recent position reported by Mode-S 0AC415.

Country allocation

The ICAO 24-bit address 0AC415 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
HK2399G - 21 2026-07-23

Recent flights last 21

DateFlightRouteTakeoffLandingDuration
2026-07-23 HK2399G - Jul 23, 17:00 UTCJul 23, 17:10 UTC10m
2026-07-22 HK2399G - Jul 22, 20:15 UTCJul 22, 21:35 UTC1h 20m
2026-07-22 HK2399G - Jul 22, 18:40 UTCJul 22, 18:55 UTC15m
2026-07-22 HK2399G - Jul 22, 17:25 UTCJul 22, 17:40 UTC15m
2026-07-18 HK2399G - Jul 18, 15:45 UTCJul 18, 17:00 UTC1h 15m
2026-07-18 HK2399G - Jul 18, 12:40 UTCJul 18, 12:50 UTC10m
2026-07-17 HK2399G - Jul 17, 19:45 UTCJul 17, 20:50 UTC1h 5m
2026-07-17 HK2399G - Jul 17, 15:44 UTCJul 17, 16:00 UTC15m
2026-07-17 HK2399G - Jul 17, 14:39 UTCJul 17, 15:25 UTC45m
2026-07-17 HK2399G - Jul 17, 13:29 UTCJul 17, 13:40 UTC10m
2026-07-17 HK2399G - Jul 17, 11:45 UTCJul 17, 12:15 UTC30m
2026-07-16 HK2399G - Jul 16, 21:50 UTCJul 16, 22:35 UTC45m
2026-07-16 HK2399G - Jul 16, 21:00 UTCJul 16, 21:19 UTC20m
2026-07-16 HK2399G - Jul 16, 17:05 UTCJul 16, 17:14 UTC10m
2026-07-16 HK2399G - Jul 16, 15:00 UTCJul 16, 15:14 UTC15m
2026-07-15 HK2399G - Jul 15, 20:20 UTCJul 15, 20:35 UTC15m
2026-07-15 HK2399G - Jul 15, 18:05 UTCJul 15, 18:15 UTC10m
2026-07-15 HK2399G - Jul 15, 16:20 UTCJul 15, 16:50 UTC30m
2026-07-15 HK2399G - Jul 15, 13:15 UTCJul 15, 14:25 UTC1h 10m
2026-07-14 HK2399G - Jul 14, 22:00 UTCJul 14, 22:30 UTC30m
2026-06-19 HK2399G - Jun 19, 19:59 UTCJun 19, 20:19 UTC20m

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-2399G page for operator, model, and routing details .

Mode-S 0AC415 frequently asked

What is Mode-S code 0AC415?
0AC415 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-2399G.
Where is Mode-S 0AC415 registered?
Mode-S code 0AC415 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 0AC415 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 17:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC415, octal 02542025, decimal 705,557.
What flights does 0AC415 operate?
Mode-S 0AC415 has broadcast 1 distinct callsign, including HK2399G.