Apparatus

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sensors Mode-S transponder

0AC9BD

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5351 · ATR-42-600

Hex
0AC9BD
Octal
02544675
Decimal
707,005
Country
CR
Tail
HK-5351
Type
AT46
No current signal · last broadcast Jul 21, 18:20 UTC
Flights observed
271
Distinct callsigns
20
Country
CR
Last broadcast
Jul 21, 18:20 UTC

Last known position

Most recent position reported by Mode-S 0AC9BD.

Country allocation

The ICAO 24-bit address 0AC9BD 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
EFY9035 - 10 2026-07-15
EFY9034 - 9 2026-07-15
EFY9046 - 6 2026-07-15
EFY9045 - 6 2026-07-12
EFY9044 - 6 2026-07-12
EFY8995 - 6 2026-07-19
EFY8994 EasyFly 6 2026-07-19
EFY9156 EasyFly 5 2026-06-20
EFY9113 EasyFly 5 2026-05-27
EFY9047 - 5 2026-07-15
EFY7839 - 5 2026-07-19
EFY7838 - 5 2026-07-19
EFY6984 - 5 2026-07-07
EFY9171 - 4 2026-07-16
EFY9169 EasyFly 4 2026-06-03
EFY9114 EasyFly 4 2026-05-27
EFY9038 - 4 2026-07-16
EFY9030 - 4 2026-07-09
EFY9015 - 4 2026-07-15
EFY9014 - 4 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 EFY7777 - Jul 21, 18:05 UTCJul 21, 18:15 UTC10m
2026-07-21 EFY7776 - Jul 21, 16:00 UTCJul 21, 16:10 UTC10m
2026-07-21 EFY8973 APO → EOH Jul 21, 14:45 UTCJul 21, 14:55 UTC10m
2026-07-21 EFY9051 PEI → EOH Jul 21, 12:20 UTCJul 21, 12:45 UTC25m
2026-07-21 EFY9050 - Jul 21, 11:15 UTCJul 21, 11:45 UTC30m
2026-07-20 EFY8942 - Jul 20, 19:35 UTCJul 20, 20:10 UTC35m
2026-07-20 EFY7819 LMC → BOG Jul 20, 17:45 UTCJul 20, 18:05 UTC20m
2026-07-20 EFY7818 - Jul 20, 14:00 UTCJul 20, 14:20 UTC20m
2026-07-20 EFY7813 - Jul 20, 12:20 UTCJul 20, 12:45 UTC25m
2026-07-20 EFY7812 - Jul 20, 10:50 UTCJul 20, 11:20 UTC30m
2026-07-19 EFY7839 - Jul 19, 22:20 UTCJul 19, 22:55 UTC35m
2026-07-19 EFY7838 - Jul 19, 20:50 UTCJul 19, 21:20 UTC30m
2026-07-19 EFY8995 - Jul 19, 19:50 UTCJul 19, 20:10 UTC20m
2026-07-19 EFY8994 BOG → PUU Jul 19, 17:10 UTCJul 19, 17:30 UTC20m
2026-07-19 EFY9109 EOH → BOG Jul 19, 11:20 UTCJul 19, 12:00 UTC40m
2026-07-18 EFY8979 APO → EOH Jul 18, 21:40 UTCJul 18, 21:45 UTC5m
2026-07-18 EFY8978 EOH → APO Jul 18, 20:05 UTCJul 18, 20:15 UTC10m
2026-07-18 EFY8954 EOH → UIB Jul 18, 17:50 UTCJul 18, 18:00 UTC10m
2026-07-18 EFY6952 - Jul 18, 15:20 UTCJul 18, 15:30 UTC10m
2026-07-18 EFY9050 - Jul 18, 13:25 UTCJul 18, 14:50 UTC1h 25m
2026-07-18 EFY9104 BOG → EOH Jul 18, 12:10 UTCJul 18, 12:50 UTC40m
2026-07-17 EFY7839 - Jul 17, 22:55 UTCJul 17, 23:25 UTC30m
2026-07-17 EFY7838 - Jul 17, 21:34 UTCJul 17, 22:00 UTC25m
2026-07-17 EFY7837 - Jul 17, 19:40 UTCJul 17, 20:20 UTC40m
2026-07-17 EFY7836 - Jul 17, 18:29 UTCJul 17, 19:00 UTC30m
2026-07-17 EFY7819 - Jul 17, 16:44 UTCJul 17, 17:09 UTC25m
2026-07-17 EFY7818 - Jul 17, 14:30 UTCJul 17, 14:50 UTC20m
2026-07-17 EFY6979 - Jul 17, 12:45 UTCJul 17, 13:00 UTC15m
2026-07-16 EFY9038 - Jul 16, 22:55 UTCJul 16, 23:15 UTC20m
2026-07-16 EFY9009 - Jul 16, 21:45 UTCJul 16, 22:05 UTC20m
2026-07-16 EFY9008 - Jul 16, 19:20 UTCJul 16, 19:35 UTC15m
2026-07-16 EFY9171 - Jul 16, 17:20 UTCJul 16, 17:40 UTC20m
2026-07-15 EFY9047 - Jul 15, 22:15 UTCJul 15, 22:40 UTC25m
2026-07-15 EFY9046 - Jul 15, 20:45 UTCJul 15, 21:00 UTC15m
2026-07-15 EFY9035 - Jul 15, 19:20 UTCJul 15, 19:40 UTC20m
2026-07-15 EFY9034 - Jul 15, 17:00 UTCJul 15, 17:15 UTC15m
2026-07-15 EFY9015 - Jul 15, 15:30 UTCJul 15, 15:55 UTC25m
2026-07-15 EFY9014 - Jul 15, 14:00 UTCJul 15, 14:15 UTC15m
2026-07-15 EFY6979 - Jul 15, 12:35 UTCJul 15, 12:55 UTC20m
2026-07-15 EFY6978 - Jul 15, 10:45 UTCJul 15, 11:00 UTC15m
2026-07-14 EFY9038 - Jul 14, 23:20 UTCJul 14, 23:35 UTC15m
2026-07-14 EFY9047 - Jul 14, 22:00 UTCJul 14, 22:25 UTC25m
2026-07-14 EFY9046 - Jul 14, 20:35 UTCJul 14, 20:45 UTC10m
2026-07-14 EFY9017 - Jul 14, 19:10 UTCJul 14, 19:35 UTC25m
2026-07-14 EFY9016 - Jul 14, 17:00 UTCJul 14, 17:15 UTC15m
2026-07-13 EFY7839 - Jul 13, 22:15 UTCJul 13, 22:40 UTC25m
2026-07-13 EFY7837 - Jul 13, 19:25 UTCJul 13, 19:55 UTC30m
2026-07-13 EFY7836 - Jul 13, 18:00 UTCJul 13, 18:25 UTC25m
2026-07-13 EFY9035 - Jul 13, 16:25 UTCJul 13, 16:50 UTC25m
2026-07-13 EFY9034 - Jul 13, 14:10 UTCJul 13, 14:30 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-5351 page for operator, model, and routing details .

Mode-S 0AC9BD frequently asked

What is Mode-S code 0AC9BD?
0AC9BD is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5351.
Where is Mode-S 0AC9BD registered?
Mode-S code 0AC9BD 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 0AC9BD broadcasting right now?
No active broadcast right now. Last signal was Jul 21, 18:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC9BD, octal 02544675, decimal 707,005.
What flights does 0AC9BD operate?
Mode-S 0AC9BD has broadcast 20 distinct callsigns, including EFY9035, EFY9034, EFY9046, EFY9045, EFY9044.