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sensors Mode-S transponder

0ACA4B

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to EJC1125 · BEECHCRAFT Super King Air 350

Hex
0ACA4B
Octal
02545113
Decimal
707,147
Country
CR
Tail
EJC1125
Type
B350
No current signal · last broadcast 1d ago
Flights observed
36
Distinct callsigns
1
Country
CR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 0ACA4B.

Country allocation

The ICAO 24-bit address 0ACA4B 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
EJC1125 - 36 2026-05-31

Recent flights last 36

DateFlightRouteTakeoffLandingDuration
2026-05-31 EJC1125 - May 31, 21:10 UTCMay 31, 21:30 UTC20m
2026-05-31 EJC1125 - May 31, 19:05 UTCMay 31, 19:20 UTC15m
2026-05-31 EJC1125 - May 31, 15:50 UTCMay 31, 16:00 UTC10m
2026-05-31 EJC1125 - May 31, 12:00 UTCMay 31, 12:15 UTC15m
2026-05-30 EJC1125 - May 30, 21:30 UTCMay 30, 21:45 UTC15m
2026-05-30 EJC1125 - May 30, 19:25 UTCMay 30, 19:35 UTC10m
2026-05-30 EJC1125 - May 30, 14:45 UTCMay 30, 15:00 UTC15m
2026-05-30 EJC1125 - May 30, 01:25 UTCMay 30, 01:50 UTC25m
2026-05-29 EJC1125 - May 29, 21:05 UTCMay 29, 21:25 UTC20m
2026-05-25 EJC1125 - May 25, 21:15 UTCMay 25, 21:40 UTC25m
2026-05-25 EJC1125 - May 25, 18:50 UTCMay 25, 19:05 UTC15m
2026-05-25 EJC1125 - May 25, 16:00 UTCMay 25, 16:15 UTC15m
2026-05-22 EJC1125 - May 22, 12:50 UTCMay 22, 13:00 UTC10m
2026-05-21 EJC1125 - May 21, 22:10 UTCMay 21, 22:15 UTC5m
2026-05-21 EJC1125 - May 21, 13:01 UTCMay 21, 13:20 UTC20m
2026-05-20 EJC1125 - May 20, 16:20 UTCMay 20, 16:30 UTC10m
2026-05-18 EJC1125 - May 18, 22:55 UTCMay 18, 23:15 UTC20m
2026-05-18 EJC1125 - May 18, 22:00 UTCMay 18, 22:15 UTC15m
2026-05-18 EJC1125 - May 18, 12:45 UTCMay 18, 13:10 UTC25m
2026-05-15 EJC1125 - May 15, 14:25 UTCMay 15, 14:45 UTC20m
2026-05-14 EJC1125 - May 14, 22:00 UTCMay 14, 22:15 UTC15m
2026-04-27 EJC1125 - Apr 27, 15:45 UTCApr 27, 16:20 UTC35m
2026-04-27 EJC1125 - Apr 27, 12:35 UTCApr 27, 12:45 UTC10m
2026-04-26 EJC1125 - Apr 26, 20:55 UTCApr 26, 21:25 UTC30m
2026-04-26 EJC1125 - Apr 26, 18:30 UTCApr 26, 18:50 UTC20m
2026-04-25 EJC1125 - Apr 25, 19:00 UTCApr 25, 19:15 UTC15m
2026-04-25 EJC1125 - Apr 25, 12:45 UTCApr 25, 13:00 UTC15m
2026-04-24 EJC1125 - Apr 24, 21:25 UTCApr 24, 21:50 UTC25m
2026-04-20 EJC1125 - Apr 20, 20:20 UTCApr 20, 20:40 UTC20m
2026-04-20 EJC1125 - Apr 20, 16:45 UTCApr 20, 17:20 UTC35m
2026-04-20 EJC1125 - Apr 20, 13:40 UTCApr 20, 14:00 UTC20m
2026-04-15 EJC1125 - Apr 15, 23:10 UTCApr 15, 23:30 UTC20m
2026-04-15 EJC1125 - Apr 15, 22:30 UTCApr 15, 22:45 UTC15m
2026-04-15 EJC1125 - Apr 15, 17:10 UTCApr 15, 17:20 UTC10m
2026-04-13 EJC1125 - Apr 13, 22:25 UTCApr 13, 22:50 UTC25m
2026-04-13 EJC1125 - Apr 13, 13:25 UTCApr 13, 13:55 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 EJC1125 page for operator, model, and routing details .

Mode-S 0ACA4B frequently asked

What is Mode-S code 0ACA4B?
0ACA4B is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to EJC1125.
Where is Mode-S 0ACA4B registered?
Mode-S code 0ACA4B 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 0ACA4B broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0ACA4B, octal 02545113, decimal 707,147.
What flights does 0ACA4B operate?
Mode-S 0ACA4B has broadcast 1 distinct callsign, including EJC1125.