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 4h ago
Flights observed
226
Distinct callsigns
20
Country
CR
Last broadcast
4h ago

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 - 9 2026-07-13
EFY9034 - 8 2026-07-13
EFY9045 - 6 2026-07-12
EFY9044 - 6 2026-07-12
EFY9156 EasyFly 5 2026-06-20
EFY9113 EasyFly 5 2026-05-27
EFY8995 EasyFly 5 2026-06-01
EFY8994 EasyFly 5 2026-06-01
EFY6984 - 5 2026-07-07
EFY9169 EasyFly 4 2026-06-03
EFY9114 EasyFly 4 2026-05-27
EFY9046 - 4 2026-07-12
EFY9030 - 4 2026-07-09
EFY9011 - 4 2026-07-10
EFY8999 - 4 2026-07-09
EFY6985 - 4 2026-07-07
EFY9171 - 3 2026-07-11
EFY9170 - 3 2026-07-11
EFY9168 EasyFly 3 2026-04-20
EFY9164 EasyFly 3 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-12 EFY9047 - Jul 12, 23:00 UTCJul 12, 23:20 UTC20m
2026-07-12 EFY9046 - Jul 12, 21:15 UTCJul 12, 21:25 UTC10m
2026-07-12 EFY9045 - Jul 12, 18:45 UTCJul 12, 19:05 UTC20m
2026-07-12 EFY9044 - Jul 12, 17:01 UTCJul 12, 17:15 UTC15m
2026-07-11 EFY9037 - Jul 11, 23:50 UTCJul 12, 00:10 UTC20m
2026-07-11 EFY9036 - Jul 11, 21:35 UTCJul 11, 21:55 UTC20m
2026-07-11 EFY9171 - Jul 11, 20:00 UTCJul 11, 20:30 UTC30m
2026-07-11 EFY9170 - Jul 11, 16:55 UTCJul 11, 17:00 UTC5m
2026-07-11 EFY9015 - Jul 11, 15:45 UTCJul 11, 16:05 UTC20m
2026-07-11 EFY9014 - Jul 11, 14:10 UTCJul 11, 14:25 UTC15m
2026-07-10 EFY9008 - Jul 10, 17:45 UTCJul 10, 18:00 UTC15m
2026-07-10 EFY7819 - Jul 10, 16:10 UTCJul 10, 16:40 UTC30m
2026-07-10 EFY7818 - Jul 10, 13:40 UTCJul 10, 14:00 UTC20m
2026-07-10 EFY9011 - Jul 10, 12:25 UTCJul 10, 12:50 UTC25m
2026-07-10 EFY9010 - Jul 10, 10:50 UTCJul 10, 11:05 UTC15m
2026-07-10 EFY9027 - Jul 10, 00:30 UTCJul 10, 01:05 UTC35m
2026-07-09 EFY9026 - Jul 9, 22:35 UTCJul 9, 22:45 UTC10m
2026-07-09 EFY9031 - Jul 9, 20:55 UTCJul 9, 21:20 UTC25m
2026-07-09 EFY9030 - Jul 9, 18:45 UTCJul 9, 19:00 UTC15m
2026-07-09 EFY9035 - Jul 9, 17:30 UTCJul 9, 17:50 UTC20m
2026-07-09 EFY9034 - Jul 9, 15:00 UTCJul 9, 15:15 UTC15m
2026-07-09 EFY8999 - Jul 9, 13:40 UTCJul 9, 14:00 UTC20m
2026-07-09 EFY8998 - Jul 9, 11:25 UTCJul 9, 11:45 UTC20m
2026-07-09 EFY8943 - Jul 9, 00:15 UTCJul 9, 00:25 UTC10m
2026-07-07 EFY6985 - Jul 7, 23:00 UTCJul 7, 23:25 UTC25m
2026-07-07 EFY6984 - Jul 7, 21:25 UTCJul 7, 21:40 UTC15m
2026-07-07 EFY6933 - Jul 7, 20:20 UTCJul 7, 20:35 UTC15m
2026-07-07 EFY6932 - Jul 7, 18:35 UTCJul 7, 18:50 UTC15m
2026-07-07 EFY9035 - Jul 7, 17:05 UTCJul 7, 17:40 UTC35m
2026-07-07 EFY9034 - Jul 7, 14:50 UTCJul 7, 15:10 UTC20m
2026-07-07 EFY9011 - Jul 7, 13:05 UTCJul 7, 13:35 UTC30m
2026-07-06 EFY9171 - Jul 6, 20:40 UTCJul 6, 21:00 UTC20m
2026-07-06 EFY9170 - Jul 6, 18:10 UTCJul 6, 18:25 UTC15m
2026-07-06 EFY9035 - Jul 6, 16:40 UTCJul 6, 17:05 UTC25m
2026-06-20 EFY8988 - Jun 20, 20:00 UTCJun 20, 20:14 UTC15m
2026-06-20 EFY9156 EOH → IBE Jun 20, 17:49 UTCJun 20, 17:59 UTC10m
2026-06-20 EFY9156 EOH → IBE Jun 20, 16:24 UTCJun 20, 16:34 UTC10m
2026-06-20 EFY8983 - Jun 20, 15:44 UTCJun 20, 15:54 UTC10m
2026-06-20 EFY8982 - Jun 20, 13:55 UTCJun 20, 14:05 UTC10m
2026-06-19 EFY9059 - Jun 19, 22:04 UTCJun 19, 22:14 UTC10m
2026-06-19 EFY9057 - Jun 19, 20:09 UTCJun 19, 20:19 UTC10m
2026-06-19 EFY9056 - Jun 19, 18:54 UTCJun 19, 19:09 UTC15m
2026-06-19 EFY9157 EOH → EOH Jun 19, 15:19 UTCJun 19, 15:24 UTC5m
2026-06-19 EFY9156 EOH → IBE Jun 19, 13:39 UTCJun 19, 13:54 UTC15m
2026-06-19 EFY9080 - Jun 19, 11:14 UTCJun 19, 11:20 UTC5m

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 4h ago.
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, EFY9045, EFY9044, EFY9156.