Apparatus

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sensors Mode-S transponder

0AC959

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5322 · ATR-72-600

Hex
0AC959
Octal
02544531
Decimal
706,905
Country
CR
Tail
HK-5322
Type
AT76
No current signal · last broadcast 4h ago
Flights observed
335
Distinct callsigns
20
Country
CR
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 0AC959.

Country allocation

The ICAO 24-bit address 0AC959 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 20 distinct

Callsign Airline Flights Last seen
AVR4853 - 12 2026-07-18
AVR4860 - 11 2026-07-18
AVR4859 - 11 2026-07-24
AVR4874 Avianca Express 10 2026-07-26
AVR4835 - 10 2026-07-17
AVR4834 - 10 2026-07-17
AVR4827 - 10 2026-07-25
AVR9277 Avianca Express 9 2026-07-19
AVR5213 - 9 2026-07-26
AVR4880 - 9 2026-07-17
AVR4867 Avianca Express 9 2026-07-26
AVR4857 Avianca Express 9 2026-07-26
AVR4855 Avianca Express 9 2026-07-24
AVR4854 Avianca Express 9 2026-07-24
AVR4852 - 9 2026-07-18
AVR4844 - 9 2026-07-25
AVR4824 - 9 2026-07-25
AVR4881 - 8 2026-07-17
AVR4858 - 8 2026-07-26
AVR4833 - 8 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AVR4803 - Jul 26, 21:25 UTCJul 26, 22:00 UTC35m
2026-07-26 AVR4858 - Jul 26, 20:05 UTCJul 26, 20:25 UTC20m
2026-07-26 AVR4857 BOG → AXM Jul 26, 18:10 UTCJul 26, 18:15 UTC5m
2026-07-26 AVR4866 - Jul 26, 16:30 UTCJul 26, 17:10 UTC40m
2026-07-26 AVR4867 BOG → AXM Jul 26, 14:35 UTCJul 26, 15:05 UTC30m
2026-07-26 AVR5212 - Jul 26, 03:35 UTCJul 26, 04:25 UTC50m
2026-07-26 AVR5213 - Jul 26, 02:00 UTCJul 26, 02:35 UTC35m
2026-07-26 AVR4874 EYP → BOG Jul 26, 00:20 UTCJul 26, 00:40 UTC20m
2026-07-25 AVR4873 - Jul 25, 22:15 UTCJul 25, 22:30 UTC15m
2026-07-25 AVR4827 - Jul 25, 20:55 UTCJul 25, 21:15 UTC20m
2026-07-25 AVR4824 - Jul 25, 19:10 UTCJul 25, 19:25 UTC15m
2026-07-25 AVR4866 - Jul 25, 16:30 UTCJul 25, 17:10 UTC40m
2026-07-25 AVR4867 BOG → AXM Jul 25, 14:40 UTCJul 25, 15:15 UTC35m
2026-07-25 AVR4844 - Jul 25, 13:05 UTCJul 25, 13:15 UTC10m
2026-07-25 AVR4895 BOG → EJA Jul 25, 01:40 UTCJul 25, 02:00 UTC20m
2026-07-25 AVR4895 BOG → EJA Jul 25, 00:30 UTCJul 25, 00:45 UTC15m
2026-07-24 AVR4827 - Jul 24, 20:50 UTCJul 24, 21:15 UTC25m
2026-07-24 AVR4824 - Jul 24, 19:20 UTCJul 24, 19:35 UTC15m
2026-07-24 AVR4854 EYP → BOG Jul 24, 17:35 UTCJul 24, 18:15 UTC40m
2026-07-24 AVR4855 BOG → EYP Jul 24, 15:45 UTCJul 24, 16:20 UTC35m
2026-07-24 AVR4828 - Jul 24, 14:05 UTCJul 24, 14:40 UTC35m
2026-07-24 AVR4829 BGA → BOG Jul 24, 12:00 UTCJul 24, 12:20 UTC20m
2026-07-24 AVR4859 - Jul 24, 00:15 UTCJul 24, 00:35 UTC20m
2026-07-23 AVR4827 - Jul 23, 22:50 UTCJul 23, 23:10 UTC20m
2026-07-23 AVR4824 - Jul 23, 19:15 UTCJul 23, 19:25 UTC10m
2026-07-23 AVR4854 - Jul 23, 17:25 UTCJul 23, 18:00 UTC35m
2026-07-23 AVR4855 - Jul 23, 15:25 UTCJul 23, 16:00 UTC35m
2026-07-23 AVR5212 - Jul 23, 03:30 UTCJul 23, 04:10 UTC40m
2026-07-23 AVR5213 - Jul 23, 01:55 UTCJul 23, 02:30 UTC35m
2026-07-23 AVR4874 EYP → BOG Jul 23, 00:15 UTCJul 23, 00:40 UTC25m
2026-07-22 AVR4895 BOG → EJA Jul 22, 22:10 UTCJul 22, 22:15 UTC5m
2026-07-22 AVR4827 - Jul 22, 20:50 UTCJul 22, 21:05 UTC15m
2026-07-22 AVR4824 - Jul 22, 19:05 UTCJul 22, 19:15 UTC10m
2026-07-22 AVR4854 - Jul 22, 17:25 UTCJul 22, 18:05 UTC40m
2026-07-22 AVR4855 - Jul 22, 15:35 UTCJul 22, 16:15 UTC40m
2026-07-22 AVR4828 - Jul 22, 13:50 UTCJul 22, 14:05 UTC15m
2026-07-22 AVR4829 BGA → BOG Jul 22, 11:50 UTCJul 22, 12:10 UTC20m
2026-07-22 AVR5212 - Jul 22, 03:40 UTCJul 22, 04:15 UTC35m
2026-07-22 AVR5213 - Jul 22, 01:50 UTCJul 22, 02:20 UTC30m
2026-07-22 AVR4874 EYP → BOG Jul 22, 00:15 UTCJul 22, 00:40 UTC25m
2026-07-21 AVR4873 - Jul 21, 22:20 UTCJul 21, 22:35 UTC15m
2026-07-21 AVR4824 - Jul 21, 19:15 UTCJul 21, 19:25 UTC10m
2026-07-21 AVR4854 - Jul 21, 17:30 UTCJul 21, 18:00 UTC30m
2026-07-21 AVR4855 - Jul 21, 15:25 UTCJul 21, 16:05 UTC40m
2026-07-21 AVR4828 - Jul 21, 14:05 UTCJul 21, 14:20 UTC15m
2026-07-21 AVR4829 BGA → BOG Jul 21, 11:55 UTCJul 21, 12:15 UTC20m
2026-07-21 EFY9049 NVA → BOG Jul 21, 02:45 UTCJul 21, 03:05 UTC20m
2026-07-21 EFY9048 BOG → NVA Jul 21, 01:05 UTCJul 21, 01:20 UTC15m
2026-07-20 EFY7839 - Jul 20, 23:05 UTCJul 20, 23:35 UTC30m
2026-07-20 EFY7838 BOG → MZL Jul 20, 22:00 UTCJul 20, 22:30 UTC30m

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-5322 page for operator, model, and routing details .

Mode-S 0AC959 frequently asked

What is Mode-S code 0AC959?
0AC959 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5322.
Where is Mode-S 0AC959 registered?
Mode-S code 0AC959 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 0AC959 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC959, octal 02544531, decimal 706,905.
What flights does 0AC959 operate?
Mode-S 0AC959 has broadcast 20 distinct callsigns, including AVR4853, AVR4860, AVR4859, AVR4874, AVR4835.