Apparatus

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sensors Mode-S transponder

0AC9AB

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5347 · ATR-72-600

Hex
0AC9AB
Octal
02544653
Decimal
706,987
Country
CR
Tail
HK-5347
Type
AT76
No current signal · last broadcast Jul 26, 22:25 UTC
Flights observed
378
Distinct callsigns
20
Country
CR
Last broadcast
Jul 26, 22:25 UTC

Last known position

Most recent position reported by Mode-S 0AC9AB.

Country allocation

The ICAO 24-bit address 0AC9AB 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
AVR5213 - 19 2026-07-10
AVR4855 - 17 2026-06-19
AVR4828 - 16 2026-06-19
AVR4824 - 16 2026-06-19
AVR4829 - 15 2026-06-19
AVR4827 - 15 2026-06-19
AVR5212 - 14 2026-06-18
AVR4874 - 14 2026-06-18
AVR4854 - 14 2026-06-19
AVR4880 - 10 2026-07-15
AVR4860 - 10 2026-07-16
AVR4859 - 10 2026-07-15
AVR4834 - 10 2026-07-15
AVR4835 - 9 2026-07-15
AVR4810 - 9 2026-07-15
AVR4809 - 9 2026-07-15
AVR4895 Avianca Express 8 2026-06-12
AVR4881 - 8 2026-07-15
AVR4858 - 8 2026-07-16
AVR4852 - 8 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AVR9265 - Jul 26, 22:10 UTCJul 26, 22:25 UTC15m
2026-07-26 AVR9255 - Jul 26, 20:25 UTCJul 26, 20:50 UTC25m
2026-07-26 AVR9254 - Jul 26, 19:20 UTCJul 26, 19:40 UTC20m
2026-07-26 AVR9277 MTR → MDE Jul 26, 14:45 UTCJul 26, 14:55 UTC10m
2026-07-26 AVR9276 - Jul 26, 12:45 UTCJul 26, 12:55 UTC10m
2026-07-25 AVR9264 - Jul 25, 23:40 UTCJul 25, 23:55 UTC15m
2026-07-25 AVR9265 - Jul 25, 22:15 UTCJul 25, 22:35 UTC20m
2026-07-25 AVR9255 - Jul 25, 20:40 UTCJul 25, 21:05 UTC25m
2026-07-25 AVR9254 - Jul 25, 19:45 UTCJul 25, 20:00 UTC15m
2026-07-25 AVR9248 BGA → MDE Jul 25, 14:30 UTCJul 25, 14:50 UTC20m
2026-07-25 AVR9248 BGA → MDE Jul 25, 13:30 UTCJul 25, 13:40 UTC10m
2026-07-25 AVR9248 BGA → MDE Jul 25, 12:30 UTCJul 25, 12:55 UTC25m
2026-07-24 AVR9264 - Jul 24, 23:50 UTCJul 25, 00:05 UTC15m
2026-07-24 AVR9265 - Jul 24, 22:20 UTCJul 24, 22:35 UTC15m
2026-07-24 AVR9255 - Jul 24, 20:35 UTCJul 24, 21:00 UTC25m
2026-07-24 AVR9277 MTR → MDE Jul 24, 14:40 UTCJul 24, 14:50 UTC10m
2026-07-23 EFY9089 BGA → EOH Jul 23, 22:20 UTCJul 23, 22:25 UTC5m
2026-07-22 EFY9089 BGA → EOH Jul 22, 21:45 UTCJul 22, 21:50 UTC5m
2026-07-21 AVR9264 - Jul 21, 23:40 UTCJul 21, 23:50 UTC10m
2026-07-21 AVR9265 - Jul 21, 22:25 UTCJul 21, 22:40 UTC15m
2026-07-21 AVR9255 - Jul 21, 20:35 UTCJul 21, 20:55 UTC20m
2026-07-21 AVR9254 - Jul 21, 19:30 UTCJul 21, 19:45 UTC15m
2026-07-21 AVR9277 MTR → MDE Jul 21, 14:40 UTCJul 21, 14:50 UTC10m
2026-07-20 EFY9088 EOH → BGA Jul 20, 22:20 UTCJul 20, 22:25 UTC5m
2026-07-19 EFY9082 EOH → BGA Jul 19, 17:20 UTCJul 19, 17:25 UTC5m
2026-07-18 EFY8958 EOH → UIB Jul 18, 20:50 UTCJul 18, 21:00 UTC10m
2026-07-18 EFY9081 - Jul 18, 20:05 UTCJul 18, 20:15 UTC10m
2026-07-17 AVR9264 - Jul 17, 23:55 UTCJul 18, 00:10 UTC15m
2026-07-17 AVR9265 - Jul 17, 22:20 UTCJul 17, 22:35 UTC15m
2026-07-17 AVR9255 - Jul 17, 20:35 UTCJul 17, 20:55 UTC20m
2026-07-17 AVR9254 - Jul 17, 19:15 UTCJul 17, 19:30 UTC15m
2026-07-17 AVR9277 - Jul 17, 14:35 UTCJul 17, 14:44 UTC10m
2026-07-16 AVR4802 - Jul 16, 23:15 UTCJul 16, 23:59 UTC45m
2026-07-16 AVR4803 - Jul 16, 21:50 UTCJul 16, 22:19 UTC30m
2026-07-16 AVR4858 - Jul 16, 20:05 UTCJul 16, 20:35 UTC30m
2026-07-16 AVR4857 - Jul 16, 18:10 UTCJul 16, 18:19 UTC10m
2026-07-16 AVR4866 - Jul 16, 16:35 UTCJul 16, 17:10 UTC35m
2026-07-16 AVR4867 - Jul 16, 14:55 UTCJul 16, 15:05 UTC10m
2026-07-16 AVR4852 - Jul 16, 03:10 UTCJul 16, 03:25 UTC15m
2026-07-16 AVR4860 - Jul 16, 00:20 UTCJul 16, 00:55 UTC35m
2026-07-15 AVR4859 - Jul 15, 22:30 UTCJul 15, 22:45 UTC15m
2026-07-15 AVR4834 - Jul 15, 20:35 UTCJul 15, 20:55 UTC20m
2026-07-15 AVR4835 - Jul 15, 18:40 UTCJul 15, 18:50 UTC10m
2026-07-15 AVR4881 - Jul 15, 17:00 UTCJul 15, 17:20 UTC20m
2026-07-15 AVR4880 - Jul 15, 15:05 UTCJul 15, 15:20 UTC15m
2026-07-15 AVR4809 - Jul 15, 13:15 UTCJul 15, 13:35 UTC20m
2026-07-15 AVR4810 - Jul 15, 11:45 UTCJul 15, 11:55 UTC10m
2026-07-15 AVR4852 - Jul 15, 03:05 UTCJul 15, 03:20 UTC15m
2026-07-15 AVR4853 - Jul 15, 02:00 UTCJul 15, 02:10 UTC10m
2026-07-15 AVR4860 - Jul 15, 00:00 UTCJul 15, 00:20 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-5347 page for operator, model, and routing details .

Mode-S 0AC9AB frequently asked

What is Mode-S code 0AC9AB?
0AC9AB is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5347.
Where is Mode-S 0AC9AB registered?
Mode-S code 0AC9AB 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 0AC9AB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC9AB, octal 02544653, decimal 706,987.
What flights does 0AC9AB operate?
Mode-S 0AC9AB has broadcast 20 distinct callsigns, including AVR5213, AVR4855, AVR4828, AVR4824, AVR4829.