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sensors Mode-S transponder

0AC3C7

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5165G · CESSNA 172 Skyhawk

Hex
0AC3C7
Octal
02541707
Decimal
705,479
Country
CR
Tail
HK-5165G
Type
C172
No current signal · last broadcast Jul 24, 20:50 UTC
Flights observed
44
Distinct callsigns
1
Country
CR
Last broadcast
Jul 24, 20:50 UTC

Last known position

Most recent position reported by Mode-S 0AC3C7.

Country allocation

The ICAO 24-bit address 0AC3C7 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
HK5165G - 44 2026-07-24

Recent flights last 44

DateFlightRouteTakeoffLandingDuration
2026-07-24 HK5165G EOH → EOH Jul 24, 19:25 UTCJul 24, 20:45 UTC1h 20m
2026-07-24 HK5165G EOH → EOH Jul 24, 18:15 UTCJul 24, 18:20 UTC5m
2026-07-24 HK5165G - Jul 24, 17:10 UTCJul 24, 17:30 UTC20m
2026-07-24 HK5165G - Jul 24, 15:50 UTCJul 24, 16:00 UTC10m
2026-07-24 HK5165G - Jul 24, 14:30 UTCJul 24, 14:50 UTC20m
2026-07-24 HK5165G - Jul 24, 12:10 UTCJul 24, 12:25 UTC15m
2026-07-22 HK5165G - Jul 22, 14:10 UTCJul 22, 14:30 UTC20m
2026-07-22 HK5165G - Jul 22, 13:15 UTCJul 22, 13:25 UTC10m
2026-07-21 HK5165G - Jul 21, 21:25 UTCJul 21, 21:40 UTC15m
2026-07-21 HK5165G - Jul 21, 20:25 UTCJul 21, 20:35 UTC10m
2026-07-21 HK5165G - Jul 21, 18:55 UTCJul 21, 19:05 UTC10m
2026-07-21 HK5165G - Jul 21, 17:50 UTCJul 21, 18:10 UTC20m
2026-07-21 HK5165G - Jul 21, 15:50 UTCJul 21, 16:00 UTC10m
2026-07-21 HK5165G - Jul 21, 14:45 UTCJul 21, 15:00 UTC15m
2026-07-21 HK5165G - Jul 21, 12:15 UTCJul 21, 12:30 UTC15m
2026-07-17 HK5165G - Jul 17, 20:15 UTCJul 17, 20:29 UTC15m
2026-07-17 HK5165G - Jul 17, 14:35 UTCJul 17, 14:44 UTC10m
2026-07-17 HK5165G - Jul 17, 13:29 UTCJul 17, 13:40 UTC10m
2026-07-17 HK5165G - Jul 17, 12:19 UTCJul 17, 12:30 UTC10m
2026-07-16 HK5165G - Jul 16, 21:40 UTCJul 16, 21:55 UTC15m
2026-07-16 HK5165G - Jul 16, 20:00 UTCJul 16, 20:15 UTC15m
2026-07-16 HK5165G - Jul 16, 17:45 UTCJul 16, 17:49 UTC5m
2026-07-16 HK5165G - Jul 16, 16:40 UTCJul 16, 16:55 UTC15m
2026-07-16 HK5165G EOH → EOH Jul 16, 15:10 UTCJul 16, 15:14 UTC5m
2026-07-16 HK5165G - Jul 16, 13:49 UTCJul 16, 14:05 UTC15m
2026-07-16 HK5165G EOH → EOH Jul 16, 12:09 UTCJul 16, 12:55 UTC45m
2026-07-15 HK5165G EOH → EOH Jul 15, 19:00 UTCJul 15, 19:10 UTC10m
2026-07-15 HK5165G - Jul 15, 17:30 UTCJul 15, 17:50 UTC20m
2026-07-15 HK5165G - Jul 15, 15:45 UTCJul 15, 16:00 UTC15m
2026-07-15 HK5165G - Jul 15, 12:15 UTCJul 15, 12:25 UTC10m
2026-07-14 HK5165G EOH → EOH Jul 14, 14:20 UTCJul 14, 14:25 UTC5m
2026-07-14 HK5165G - Jul 14, 12:05 UTCJul 14, 12:20 UTC15m
2026-07-10 HK5165G - Jul 10, 20:10 UTCJul 10, 20:15 UTC5m
2026-07-10 HK5165G - Jul 10, 19:05 UTCJul 10, 19:20 UTC15m
2026-07-10 HK5165G - Jul 10, 17:50 UTCJul 10, 17:55 UTC5m
2026-07-10 HK5165G - Jul 10, 16:40 UTCJul 10, 16:55 UTC15m
2026-07-10 HK5165G - Jul 10, 15:20 UTCJul 10, 15:30 UTC10m
2026-07-10 HK5165G - Jul 10, 12:20 UTCJul 10, 12:35 UTC15m
2026-07-09 HK5165G - Jul 9, 20:40 UTCJul 9, 20:55 UTC15m
2026-07-09 HK5165G - Jul 9, 19:30 UTCJul 9, 19:40 UTC10m
2026-07-09 HK5165G - Jul 9, 16:00 UTCJul 9, 16:05 UTC5m
2026-07-09 HK5165G - Jul 9, 14:40 UTCJul 9, 14:55 UTC15m
2026-07-09 HK5165G - Jul 9, 13:25 UTCJul 9, 13:30 UTC5m
2026-07-09 HK5165G - Jul 9, 12:15 UTCJul 9, 12:30 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-5165G page for operator, model, and routing details .

Mode-S 0AC3C7 frequently asked

What is Mode-S code 0AC3C7?
0AC3C7 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5165G.
Where is Mode-S 0AC3C7 registered?
Mode-S code 0AC3C7 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 0AC3C7 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC3C7, octal 02541707, decimal 705,479.
What flights does 0AC3C7 operate?
Mode-S 0AC3C7 has broadcast 1 distinct callsign, including HK5165G.