Apparatus

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sensors Mode-S transponder

0AC424

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5313 · ATR-42-600

Hex
0AC424
Octal
02542044
Decimal
705,572
Country
CR
Tail
HK-5313
Type
AT46
No current signal · last broadcast 14h ago
Flights observed
146
Distinct callsigns
20
Country
CR
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 0AC424.

Country allocation

The ICAO 24-bit address 0AC424 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
EFY7820 - 11 2026-07-17
EFY7821 - 10 2026-07-17
EFY8948 - 5 2026-07-15
EFY9157 - 4 2026-07-17
EFY9156 - 4 2026-07-17
EFY8970 - 4 2026-07-15
EFY7864 - 4 2026-07-15
EFY9127 - 3 2026-07-14
EFY9114 EasyFly 3 2026-06-10
EFY9113 EasyFly 3 2026-06-10
EFY9110 EasyFly 3 2026-06-08
EFY9081 - 3 2026-07-17
EFY9027 EasyFly 3 2026-06-13
EFY9026 EasyFly 3 2026-06-12
EFY8979 - 3 2026-07-15
EFY8954 - 3 2026-07-13
EFY7777 - 3 2026-07-16
EFY7776 - 3 2026-07-16
EFY7772 EasyFly 3 2026-05-21
EFY9128 - 2 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 EFY7821 - Jul 17, 21:05 UTCJul 17, 21:50 UTC45m
2026-07-17 EFY7820 - Jul 17, 19:09 UTCJul 17, 20:00 UTC50m
2026-07-17 EFY6974 EOH → NQU Jul 17, 16:44 UTCJul 17, 16:55 UTC10m
2026-07-17 EFY9157 - Jul 17, 15:44 UTCJul 17, 16:10 UTC25m
2026-07-17 EFY9156 - Jul 17, 14:04 UTCJul 17, 14:39 UTC35m
2026-07-17 EFY9081 - Jul 17, 13:15 UTCJul 17, 13:25 UTC10m
2026-07-17 EFY9080 - Jul 17, 11:20 UTCJul 17, 11:25 UTC5m
2026-07-16 EFY9058 EOH → PEI Jul 16, 21:55 UTCJul 16, 23:20 UTC1h 25m
2026-07-16 EFY9057 PEI → EOH Jul 16, 21:05 UTCJul 16, 21:25 UTC20m
2026-07-16 EFY9056 - Jul 16, 19:55 UTCJul 16, 20:29 UTC35m
2026-07-16 EFY7777 - Jul 16, 18:55 UTCJul 16, 19:10 UTC15m
2026-07-16 EFY7776 - Jul 16, 16:35 UTCJul 16, 16:44 UTC10m
2026-07-16 EFY9157 - Jul 16, 15:30 UTCJul 16, 15:55 UTC25m
2026-07-16 EFY9156 - Jul 16, 14:05 UTCJul 16, 14:25 UTC20m
2026-07-16 EFY9081 - Jul 16, 13:10 UTCJul 16, 13:20 UTC10m
2026-07-15 EFY8979 - Jul 15, 21:55 UTCJul 15, 22:05 UTC10m
2026-07-15 EFY7865 - Jul 15, 20:25 UTCJul 15, 20:35 UTC10m
2026-07-15 EFY7864 - Jul 15, 18:00 UTCJul 15, 18:10 UTC10m
2026-07-15 EFY8948 - Jul 15, 15:40 UTCJul 15, 15:50 UTC10m
2026-07-15 EFY8946 - Jul 15, 13:40 UTCJul 15, 13:45 UTC5m
2026-07-15 EFY8971 - Jul 15, 12:35 UTCJul 15, 12:45 UTC10m
2026-07-15 EFY8970 - Jul 15, 11:10 UTCJul 15, 11:20 UTC10m
2026-07-14 EFY9128 - Jul 14, 21:25 UTCJul 14, 21:55 UTC30m
2026-07-14 EFY9127 - Jul 14, 19:45 UTCJul 14, 20:30 UTC45m
2026-07-14 EFY7777 - Jul 14, 18:25 UTCJul 14, 18:30 UTC5m
2026-07-14 EFY7776 - Jul 14, 16:10 UTCJul 14, 16:20 UTC10m
2026-07-14 EFY9157 - Jul 14, 15:10 UTCJul 14, 15:25 UTC15m
2026-07-14 EFY9156 - Jul 14, 13:40 UTCJul 14, 14:05 UTC25m
2026-07-14 EFY9081 - Jul 14, 12:55 UTCJul 14, 13:05 UTC10m
2026-07-13 EFY8955 - Jul 13, 22:10 UTCJul 13, 22:20 UTC10m
2026-07-13 EFY8954 - Jul 13, 20:45 UTCJul 13, 20:50 UTC5m
2026-07-13 EFY7864 - Jul 13, 18:10 UTCJul 13, 18:15 UTC5m
2026-07-13 EFY8948 - Jul 13, 15:45 UTCJul 13, 15:55 UTC10m
2026-07-13 EFY7851 - Jul 13, 14:50 UTCJul 13, 15:00 UTC10m
2026-07-13 EFY7850 - Jul 13, 12:40 UTCJul 13, 12:50 UTC10m
2026-07-12 EFY7864 - Jul 12, 18:35 UTCJul 12, 18:45 UTC10m
2026-07-12 EFY8948 - Jul 12, 15:15 UTCJul 12, 15:25 UTC10m
2026-07-11 EFY8979 - Jul 11, 21:25 UTCJul 11, 21:35 UTC10m
2026-07-11 EFY7777 - Jul 11, 17:50 UTCJul 11, 18:00 UTC10m
2026-07-11 EFY7776 - Jul 11, 15:50 UTCJul 11, 16:00 UTC10m
2026-07-11 EFY9157 - Jul 11, 15:05 UTCJul 11, 15:15 UTC10m
2026-07-11 EFY9156 - Jul 11, 13:35 UTCJul 11, 14:05 UTC30m
2026-07-10 EFY8954 - Jul 10, 21:35 UTCJul 10, 21:45 UTC10m
2026-07-10 EFY7821 - Jul 10, 20:55 UTCJul 10, 21:05 UTC10m
2026-07-10 EFY7820 - Jul 10, 18:30 UTCJul 10, 19:10 UTC40m
2026-07-10 EFY8948 - Jul 10, 16:35 UTCJul 10, 16:45 UTC10m
2026-07-10 EFY8947 - Jul 10, 15:50 UTCJul 10, 16:00 UTC10m
2026-07-10 EFY8970 - Jul 10, 11:15 UTCJul 10, 11:25 UTC10m
2026-07-09 EFY9130 BOG → EOH Jul 9, 21:00 UTCJul 9, 21:40 UTC40m
2026-07-09 EFY9045 - Jul 9, 19:10 UTCJul 9, 19:30 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-5313 page for operator, model, and routing details .

Mode-S 0AC424 frequently asked

What is Mode-S code 0AC424?
0AC424 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5313.
Where is Mode-S 0AC424 registered?
Mode-S code 0AC424 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 0AC424 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC424, octal 02542044, decimal 705,572.
What flights does 0AC424 operate?
Mode-S 0AC424 has broadcast 20 distinct callsigns, including EFY7820, EFY7821, EFY8948, EFY9157, EFY9156.