Apparatus

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sensors Mode-S transponder

0AC3B6

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-4646G · CESSNA 172 Skyhawk

Hex
0AC3B6
Octal
02541666
Decimal
705,462
Country
CR
Tail
HK-4646G
Type
C172
No current signal · last broadcast 9h ago
Flights observed
99
Distinct callsigns
1
Country
CR
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 0AC3B6.

Country allocation

The ICAO 24-bit address 0AC3B6 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
HK4646G - 99 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HK4646G - Jul 17, 17:05 UTCJul 17, 17:44 UTC40m
2026-07-16 HK4646G - Jul 16, 17:14 UTCJul 16, 17:54 UTC40m
2026-07-15 HK4646G - Jul 15, 17:15 UTCJul 15, 18:00 UTC45m
2026-07-15 HK4646G - Jul 15, 12:10 UTCJul 15, 12:20 UTC10m
2026-07-14 HK4646G - Jul 14, 19:10 UTCJul 14, 19:35 UTC25m
2026-07-14 HK4646G - Jul 14, 17:15 UTCJul 14, 18:00 UTC45m
2026-07-12 HK4646G - Jul 12, 11:50 UTCJul 12, 12:40 UTC50m
2026-07-11 HK4646G - Jul 11, 17:50 UTCJul 11, 18:25 UTC35m
2026-07-11 HK4646G - Jul 11, 16:20 UTCJul 11, 16:50 UTC30m
2026-07-11 HK4646G - Jul 11, 14:55 UTCJul 11, 15:25 UTC30m
2026-07-10 HK4646G - Jul 10, 17:10 UTCJul 10, 17:45 UTC35m
2026-07-10 HK4646G - Jul 10, 16:00 UTCJul 10, 16:20 UTC20m
2026-07-09 HK4646G - Jul 9, 18:05 UTCJul 9, 18:25 UTC20m
2026-07-07 HK4646G - Jul 7, 13:30 UTCJul 7, 13:40 UTC10m
2026-07-06 HK4646G - Jul 6, 19:05 UTCJul 6, 19:35 UTC30m
2026-07-05 HK4646G - Jul 5, 14:40 UTCJul 5, 15:10 UTC30m
2026-07-01 HK4646G - Jul 1, 14:55 UTCJul 1, 15:20 UTC25m
2026-07-01 HK4646G - Jul 1, 13:15 UTCJul 1, 13:40 UTC25m
2026-06-30 HK4646G - Jun 30, 20:35 UTCJun 30, 21:00 UTC25m
2026-06-18 HK4646G - Jun 18, 15:55 UTCJun 18, 16:35 UTC40m
2026-06-18 HK4646G - Jun 18, 14:45 UTCJun 18, 15:15 UTC30m
2026-06-18 HK4646G - Jun 18, 13:20 UTCJun 18, 13:55 UTC35m
2026-06-17 HK4646G - Jun 17, 14:00 UTCJun 17, 14:15 UTC15m
2026-06-17 HK4646G - Jun 17, 12:10 UTCJun 17, 12:30 UTC20m
2026-06-15 HK4646G - Jun 15, 14:40 UTCJun 15, 15:10 UTC30m
2026-06-12 HK4646G - Jun 12, 13:25 UTCJun 12, 13:50 UTC25m
2026-06-11 HK4646G - Jun 11, 20:15 UTCJun 11, 20:40 UTC25m
2026-06-11 HK4646G - Jun 11, 16:05 UTCJun 11, 16:35 UTC30m
2026-06-11 HK4646G - Jun 11, 13:20 UTCJun 11, 13:40 UTC20m
2026-06-10 HK4646G - Jun 10, 19:15 UTCJun 10, 19:45 UTC30m
2026-06-10 HK4646G - Jun 10, 17:40 UTCJun 10, 18:15 UTC35m
2026-06-10 HK4646G - Jun 10, 14:55 UTCJun 10, 15:20 UTC25m
2026-06-10 HK4646G - Jun 10, 13:35 UTCJun 10, 14:05 UTC30m
2026-06-09 HK4646G - Jun 9, 19:50 UTCJun 9, 21:15 UTC1h 25m
2026-06-08 HK4646G - Jun 8, 18:20 UTCJun 8, 18:40 UTC20m
2026-06-08 HK4646G - Jun 8, 16:15 UTCJun 8, 16:40 UTC25m
2026-06-08 HK4646G - Jun 8, 14:40 UTCJun 8, 15:10 UTC30m
2026-06-08 HK4646G - Jun 8, 12:40 UTCJun 8, 13:00 UTC20m
2026-06-07 HK4646G - Jun 7, 17:25 UTCJun 7, 17:55 UTC30m
2026-06-07 HK4646G - Jun 7, 15:45 UTCJun 7, 16:20 UTC35m
2026-06-07 HK4646G - Jun 7, 14:40 UTCJun 7, 14:50 UTC10m
2026-06-07 HK4646G - Jun 7, 13:25 UTCJun 7, 13:55 UTC30m
2026-06-06 HK4646G - Jun 6, 20:14 UTCJun 6, 20:39 UTC25m
2026-06-06 HK4646G - Jun 6, 18:39 UTCJun 6, 19:10 UTC30m
2026-06-06 HK4646G - Jun 6, 15:50 UTCJun 6, 16:24 UTC35m
2026-06-06 HK4646G - Jun 6, 14:00 UTCJun 6, 14:25 UTC25m
2026-06-05 HK4646G - Jun 5, 15:25 UTCJun 5, 16:00 UTC35m
2026-06-04 HK4646G - Jun 4, 16:05 UTCJun 4, 16:30 UTC25m
2026-06-04 HK4646G - Jun 4, 14:35 UTCJun 4, 15:05 UTC30m
2026-06-03 HK4646G - Jun 3, 20:35 UTCJun 3, 21:30 UTC55m

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-4646G page for operator, model, and routing details .

Mode-S 0AC3B6 frequently asked

What is Mode-S code 0AC3B6?
0AC3B6 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-4646G.
Where is Mode-S 0AC3B6 registered?
Mode-S code 0AC3B6 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 0AC3B6 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC3B6, octal 02541666, decimal 705,462.
What flights does 0AC3B6 operate?
Mode-S 0AC3B6 has broadcast 1 distinct callsign, including HK4646G.