Apparatus

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sensors Mode-S transponder

0AC997

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5341 · ATR-42-600

Hex
0AC997
Octal
02544627
Decimal
706,967
Country
CR
Tail
HK-5341
Type
AT46
No current signal · last broadcast 1h ago
Flights observed
245
Distinct callsigns
20
Country
CR
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 0AC997.

Country allocation

The ICAO 24-bit address 0AC997 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
EFY9170 - 9 2026-07-13
EFY6932 - 9 2026-07-13
EFY9171 - 8 2026-07-13
EFY9031 - 8 2026-07-11
EFY8994 - 8 2026-07-11
EFY9030 - 7 2026-07-11
EFY8995 - 7 2026-07-11
EFY6933 EasyFly 7 2026-06-11
EFY9165 EasyFly 6 2026-06-01
EFY9168 - 5 2026-07-07
EFY9164 EasyFly 5 2026-05-27
EFY9045 - 5 2026-07-14
EFY9044 - 5 2026-07-14
EFY7834 EasyFly 5 2026-05-29
EFY9169 - 4 2026-07-10
EFY9114 EasyFly 4 2026-06-04
EFY9048 - 4 2026-07-14
EFY9046 EasyFly 4 2026-06-07
EFY9041 - 4 2026-07-13
EFY9017 - 4 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 EFY9045 - Jul 14, 18:35 UTCJul 14, 18:55 UTC20m
2026-07-14 EFY9044 - Jul 14, 16:55 UTCJul 14, 17:05 UTC10m
2026-07-14 EFY9015 - Jul 14, 15:30 UTCJul 14, 15:55 UTC25m
2026-07-14 HK5341 - Jul 14, 02:15 UTCJul 14, 02:30 UTC15m
2026-07-14 EFY9048 - Jul 14, 00:30 UTCJul 14, 00:50 UTC20m
2026-07-13 EFY6985 - Jul 13, 23:05 UTCJul 13, 23:25 UTC20m
2026-07-13 EFY6932 - Jul 13, 18:00 UTCJul 13, 18:20 UTC20m
2026-07-13 EFY9171 - Jul 13, 16:50 UTCJul 13, 17:10 UTC20m
2026-07-13 EFY9170 - Jul 13, 13:55 UTCJul 13, 14:20 UTC25m
2026-07-13 EFY9041 - Jul 13, 12:45 UTCJul 13, 13:00 UTC15m
2026-07-12 EFY9130 - Jul 12, 22:10 UTCJul 12, 22:55 UTC45m
2026-07-12 EFY9130 BOG → EOH Jul 12, 20:55 UTCJul 12, 21:30 UTC35m
2026-07-12 EFY9017 - Jul 12, 19:30 UTCJul 12, 19:45 UTC15m
2026-07-12 EFY9016 - Jul 12, 17:25 UTCJul 12, 17:45 UTC20m
2026-07-11 EFY7839 - Jul 11, 22:25 UTCJul 11, 22:40 UTC15m
2026-07-11 EFY7838 - Jul 11, 20:50 UTCJul 11, 21:10 UTC20m
2026-07-11 EFY9031 - Jul 11, 18:45 UTCJul 11, 19:05 UTC20m
2026-07-11 EFY9030 - Jul 11, 16:25 UTCJul 11, 16:45 UTC20m
2026-07-11 EFY8995 - Jul 11, 15:15 UTCJul 11, 15:40 UTC25m
2026-07-11 EFY8994 - Jul 11, 12:45 UTCJul 11, 13:00 UTC15m
2026-07-10 EFY9169 - Jul 10, 23:55 UTCJul 11, 00:05 UTC10m
2026-07-10 EFY9030 - Jul 10, 17:50 UTCJul 10, 18:05 UTC15m
2026-07-10 EFY9035 - Jul 10, 16:20 UTCJul 10, 16:45 UTC25m
2026-07-10 EFY9034 - Jul 10, 14:00 UTCJul 10, 14:20 UTC20m
2026-07-09 EFY7839 - Jul 9, 22:45 UTCJul 9, 23:00 UTC15m
2026-07-09 EFY7838 - Jul 9, 21:20 UTCJul 9, 21:35 UTC15m
2026-07-09 EFY9001 - Jul 9, 19:45 UTCJul 9, 20:15 UTC30m
2026-07-09 EFY9000 - Jul 9, 14:40 UTCJul 9, 15:00 UTC20m
2026-07-09 EFY6979 - Jul 9, 13:15 UTCJul 9, 13:30 UTC15m
2026-07-09 EFY6978 - Jul 9, 11:35 UTCJul 9, 11:50 UTC15m
2026-07-08 EFY9031 - Jul 8, 22:25 UTCJul 8, 22:50 UTC25m
2026-07-08 EFY9169 - Jul 8, 00:20 UTCJul 8, 00:30 UTC10m
2026-07-07 EFY9168 - Jul 7, 21:25 UTCJul 7, 21:40 UTC15m
2026-07-07 EFY9195 - Jul 7, 18:35 UTCJul 7, 19:00 UTC25m
2026-07-06 EFY7839 - Jul 6, 23:10 UTCJul 6, 23:30 UTC20m
2026-07-06 EFY7838 - Jul 6, 20:45 UTCJul 6, 21:05 UTC20m
2026-07-06 EFY7837 - Jul 6, 19:40 UTCJul 6, 19:55 UTC15m
2026-07-06 EFY7836 - Jul 6, 18:15 UTCJul 6, 18:30 UTC15m
2026-07-06 EFY8941 - Jul 6, 16:40 UTCJul 6, 16:55 UTC15m
2026-07-06 EFY9039 - Jul 6, 01:25 UTCJul 6, 01:45 UTC20m
2026-06-20 EFY8979 - Jun 20, 21:30 UTCJun 20, 21:40 UTC10m
2026-06-20 EFY8978 - Jun 20, 20:09 UTCJun 20, 20:20 UTC10m
2026-06-20 EFY7864 - Jun 20, 17:34 UTCJun 20, 17:39 UTC5m
2026-06-19 EFY8989 - Jun 19, 22:19 UTCJun 19, 22:30 UTC10m
2026-06-19 EFY8987 - Jun 19, 19:49 UTCJun 19, 19:59 UTC10m
2026-06-19 EFY8986 - Jun 19, 18:05 UTCJun 19, 18:14 UTC10m
2026-06-18 EFY6925 - Jun 18, 22:45 UTCJun 18, 23:00 UTC15m
2026-06-18 EFY6926 - Jun 18, 21:55 UTCJun 18, 22:00 UTC5m
2026-06-18 EFY6915 - Jun 18, 18:05 UTCJun 18, 18:20 UTC15m
2026-06-18 EFY6916 - Jun 18, 17:10 UTCJun 18, 17:21 UTC11m

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-5341 page for operator, model, and routing details .

Mode-S 0AC997 frequently asked

What is Mode-S code 0AC997?
0AC997 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5341.
Where is Mode-S 0AC997 registered?
Mode-S code 0AC997 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 0AC997 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC997, octal 02544627, decimal 706,967.
What flights does 0AC997 operate?
Mode-S 0AC997 has broadcast 20 distinct callsigns, including EFY9170, EFY6932, EFY9171, EFY9031, EFY8994.