Apparatus

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sensors Mode-S transponder

0AC956

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5321 · ATR-42-600

Hex
0AC956
Octal
02544526
Decimal
706,902
Country
CR
Tail
HK-5321
Type
AT46
No current signal · last broadcast 6h ago
Flights observed
289
Distinct callsigns
20
Country
CR
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 0AC956.

Country allocation

The ICAO 24-bit address 0AC956 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
EFY9045 - 11 2026-07-13
EFY9044 - 9 2026-07-13
EFY8941 - 8 2026-07-11
EFY8940 EasyFly 8 2026-07-11
EFY9039 - 7 2026-07-10
EFY6933 EasyFly 7 2026-06-15
EFY6932 EasyFly 7 2026-06-15
EFY9038 - 6 2026-07-09
EFY9031 - 6 2026-06-17
EFY9030 - 6 2026-06-17
EFY8942 - 6 2026-07-13
EFY9168 EasyFly 5 2026-06-10
EFY9049 - 5 2026-07-06
EFY9047 - 5 2026-07-09
EFY9046 - 5 2026-07-09
EFY9021 - 5 2026-07-11
EFY9020 - 5 2026-07-11
EFY9014 EasyFly 5 2026-06-10
EFY8998 - 5 2026-07-10
EFY8995 - 5 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 EFY9131 EOH → BOG Jul 13, 23:00 UTCJul 13, 23:45 UTC45m
2026-07-13 EFY8959 - Jul 13, 22:20 UTCJul 13, 22:25 UTC5m
2026-07-13 EFY8942 - Jul 13, 21:00 UTCJul 13, 21:10 UTC10m
2026-07-13 EFY9045 - Jul 13, 19:00 UTCJul 13, 19:25 UTC25m
2026-07-13 EFY9044 - Jul 13, 17:20 UTCJul 13, 17:35 UTC15m
2026-07-13 EFY7835 - Jul 13, 15:50 UTCJul 13, 16:25 UTC35m
2026-07-13 EFY7834 - Jul 13, 14:35 UTCJul 13, 15:00 UTC25m
2026-07-12 EFY7839 - Jul 12, 22:20 UTCJul 12, 23:00 UTC40m
2026-07-12 EFY7838 - Jul 12, 21:05 UTCJul 12, 21:35 UTC30m
2026-07-12 EFY8995 - Jul 12, 19:45 UTCJul 12, 20:10 UTC25m
2026-07-12 EFY8994 - Jul 12, 16:45 UTCJul 12, 17:05 UTC20m
2026-07-12 EFY9027 - Jul 12, 00:25 UTCJul 12, 00:50 UTC25m
2026-07-11 EFY9026 - Jul 11, 22:25 UTCJul 11, 22:40 UTC15m
2026-07-11 EFY9021 - Jul 11, 21:00 UTCJul 11, 21:20 UTC20m
2026-07-11 EFY9020 - Jul 11, 19:10 UTCJul 11, 19:25 UTC15m
2026-07-11 EFY8941 - Jul 11, 16:35 UTCJul 11, 16:45 UTC10m
2026-07-11 EFY8940 BOG → UIB Jul 11, 13:50 UTCJul 11, 14:10 UTC20m
2026-07-11 EFY9041 - Jul 11, 12:30 UTCJul 11, 12:50 UTC20m
2026-07-11 EFY9040 - Jul 11, 10:55 UTCJul 11, 11:10 UTC15m
2026-07-11 EFY9173 - Jul 11, 00:00 UTCJul 11, 00:50 UTC50m
2026-07-10 EFY9191 - Jul 10, 17:25 UTCJul 10, 17:45 UTC20m
2026-07-10 EFY9190 - Jul 10, 15:05 UTCJul 10, 15:20 UTC15m
2026-07-10 EFY9190 - Jul 10, 13:35 UTCJul 10, 13:55 UTC20m
2026-07-10 EFY8998 - Jul 10, 11:30 UTCJul 10, 11:50 UTC20m
2026-07-10 EFY9039 - Jul 10, 01:50 UTCJul 10, 02:10 UTC20m
2026-07-09 EFY9038 - Jul 9, 23:20 UTCJul 9, 23:35 UTC15m
2026-07-09 EFY9047 - Jul 9, 21:55 UTCJul 9, 22:15 UTC20m
2026-07-09 EFY9046 - Jul 9, 20:20 UTCJul 9, 20:35 UTC15m
2026-07-09 EFY8995 - Jul 9, 18:25 UTCJul 9, 18:55 UTC30m
2026-07-09 EFY8994 - Jul 9, 15:45 UTCJul 9, 16:05 UTC20m
2026-07-09 EFY9113 - Jul 9, 13:55 UTCJul 9, 14:45 UTC50m
2026-07-09 EFY8980 - Jul 9, 11:05 UTCJul 9, 11:10 UTC5m
2026-07-06 EFY9122 - Jul 6, 17:50 UTCJul 6, 18:05 UTC15m
2026-07-06 EFY7819 - Jul 6, 16:20 UTCJul 6, 16:35 UTC15m
2026-07-06 EFY9049 - Jul 6, 02:15 UTCJul 6, 02:40 UTC25m
2026-07-06 EFY9048 - Jul 6, 00:40 UTCJul 6, 00:55 UTC15m
2026-06-20 EFY9059 - Jun 20, 22:00 UTCJun 20, 22:10 UTC10m
2026-06-20 EFY8955 - Jun 20, 20:40 UTCJun 20, 20:55 UTC15m
2026-06-20 EFY8954 - Jun 20, 17:24 UTCJun 20, 17:34 UTC10m
2026-06-20 EFY6915 - Jun 20, 14:19 UTCJun 20, 14:29 UTC10m
2026-06-20 EFY9051 - Jun 20, 13:29 UTCJun 20, 13:39 UTC10m
2026-06-20 EFY9050 - Jun 20, 12:14 UTCJun 20, 12:30 UTC15m
2026-06-20 EFY9104 - Jun 20, 11:30 UTCJun 20, 11:40 UTC10m
2026-06-19 EFY7838 - Jun 19, 20:40 UTCJun 19, 20:55 UTC15m
2026-06-19 EFY9045 - Jun 19, 19:09 UTCJun 19, 19:29 UTC20m
2026-06-19 EFY9044 - Jun 19, 17:14 UTCJun 19, 17:29 UTC15m
2026-06-19 EFY8941 - Jun 19, 15:59 UTCJun 19, 16:19 UTC20m
2026-06-19 EFY8940 BOG → UIB Jun 19, 14:04 UTCJun 19, 14:24 UTC20m
2026-06-19 EFY6979 - Jun 19, 12:39 UTCJun 19, 12:54 UTC15m
2026-06-19 EFY6978 - Jun 19, 10:50 UTCJun 19, 11:09 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-5321 page for operator, model, and routing details .

Mode-S 0AC956 frequently asked

What is Mode-S code 0AC956?
0AC956 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5321.
Where is Mode-S 0AC956 registered?
Mode-S code 0AC956 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 0AC956 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC956, octal 02544526, decimal 706,902.
What flights does 0AC956 operate?
Mode-S 0AC956 has broadcast 20 distinct callsigns, including EFY9045, EFY9044, EFY8941, EFY8940, EFY9039.