Apparatus

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sensors Mode-S transponder

0AC136

ICAO 24-bit transponder address · allocated to Costa Rica

Hex
0AC136
Octal
02540466
Decimal
704,822
Country
CR
No current signal · last broadcast Jul 24, 22:00 UTC
Flights observed
62
Distinct callsigns
1
Country
CR
Last broadcast
Jul 24, 22:00 UTC

Last known position

Most recent position reported by Mode-S 0AC136.

Country allocation

The ICAO 24-bit address 0AC136 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
HK4803 - 62 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 HK4803 - Jul 24, 21:50 UTCJul 24, 22:00 UTC10m
2026-07-24 HK4803 - Jul 24, 20:40 UTCJul 24, 20:50 UTC10m
2026-07-24 HK4803 - Jul 24, 15:40 UTCJul 24, 15:50 UTC10m
2026-07-24 HK4803 - Jul 24, 14:10 UTCJul 24, 14:25 UTC15m
2026-07-24 HK4803 - Jul 24, 13:10 UTCJul 24, 13:20 UTC10m
2026-07-24 HK4803 - Jul 24, 12:15 UTCJul 24, 12:30 UTC15m
2026-07-24 HK4803 - Jul 24, 11:05 UTCJul 24, 11:15 UTC10m
2026-07-21 HK4803 - Jul 21, 15:00 UTCJul 21, 15:05 UTC5m
2026-07-21 HK4803 - Jul 21, 12:10 UTCJul 21, 12:20 UTC10m
2026-07-21 HK4803 - Jul 21, 11:00 UTCJul 21, 11:15 UTC15m
2026-07-20 HK4803 - Jul 20, 22:00 UTCJul 20, 22:15 UTC15m
2026-07-20 HK4803 - Jul 20, 20:55 UTCJul 20, 21:05 UTC10m
2026-07-20 HK4803 - Jul 20, 20:25 UTCJul 20, 20:30 UTC5m
2026-07-20 HK4803 - Jul 20, 17:00 UTCJul 20, 17:10 UTC10m
2026-07-20 HK4803 - Jul 20, 15:30 UTCJul 20, 15:50 UTC20m
2026-07-20 HK4803 - Jul 20, 13:55 UTCJul 20, 14:05 UTC10m
2026-07-18 HK4803 - Jul 18, 22:00 UTCJul 18, 22:10 UTC10m
2026-07-18 HK4803 - Jul 18, 20:50 UTCJul 18, 21:00 UTC10m
2026-07-18 HK4803 - Jul 18, 18:55 UTCJul 18, 19:10 UTC15m
2026-07-18 HK4803 - Jul 18, 13:40 UTCJul 18, 13:50 UTC10m
2026-07-18 HK4803 - Jul 18, 12:30 UTCJul 18, 12:40 UTC10m
2026-07-17 HK4803 - Jul 17, 21:50 UTCJul 17, 21:55 UTC5m
2026-07-17 HK4803 - Jul 17, 20:40 UTCJul 17, 20:50 UTC10m
2026-07-17 HK4803 - Jul 17, 15:29 UTCJul 17, 15:44 UTC15m
2026-07-17 HK4803 - Jul 17, 12:19 UTCJul 17, 12:30 UTC10m
2026-07-16 HK4803 - Jul 16, 21:50 UTCJul 16, 22:00 UTC10m
2026-07-16 HK4803 - Jul 16, 20:45 UTCJul 16, 20:55 UTC10m
2026-07-16 HK4803 - Jul 16, 12:20 UTCJul 16, 12:30 UTC10m
2026-07-16 HK4803 - Jul 16, 10:59 UTCJul 16, 11:10 UTC10m
2026-07-15 HK4803 - Jul 15, 21:50 UTCJul 15, 22:00 UTC10m
2026-07-15 HK4803 - Jul 15, 20:40 UTCJul 15, 20:50 UTC10m
2026-07-15 HK4803 - Jul 15, 16:20 UTCJul 15, 16:35 UTC15m
2026-07-15 HK4803 - Jul 15, 14:55 UTCJul 15, 15:10 UTC15m
2026-07-15 HK4803 - Jul 15, 12:25 UTCJul 15, 12:35 UTC10m
2026-07-15 HK4803 - Jul 15, 11:00 UTCJul 15, 11:10 UTC10m
2026-07-14 HK4803 - Jul 14, 12:30 UTCJul 14, 12:40 UTC10m
2026-07-14 HK4803 - Jul 14, 11:10 UTCJul 14, 11:20 UTC10m
2026-07-13 HK4803 - Jul 13, 21:45 UTCJul 13, 21:55 UTC10m
2026-07-13 HK4803 - Jul 13, 20:40 UTCJul 13, 20:50 UTC10m
2026-07-13 HK4803 - Jul 13, 16:40 UTCJul 13, 16:55 UTC15m
2026-07-13 HK4803 - Jul 13, 15:25 UTCJul 13, 15:40 UTC15m
2026-07-11 HK4803 - Jul 11, 20:25 UTCJul 11, 20:30 UTC5m
2026-07-11 HK4803 - Jul 11, 19:10 UTCJul 11, 19:20 UTC10m
2026-07-11 HK4803 - Jul 11, 13:45 UTCJul 11, 13:55 UTC10m
2026-07-10 HK4803 - Jul 10, 15:10 UTCJul 10, 15:20 UTC10m
2026-06-20 HK4803 - Jun 20, 13:29 UTCJun 20, 13:34 UTC5m
2026-06-18 HK4803 - Jun 18, 12:20 UTCJun 18, 12:35 UTC15m
2026-06-18 HK4803 - Jun 18, 11:15 UTCJun 18, 11:25 UTC10m
2026-06-17 HK4803 - Jun 17, 14:05 UTCJun 17, 14:10 UTC5m
2026-06-17 HK4803 - Jun 17, 12:20 UTCJun 17, 12:35 UTC15m

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.

Mode-S 0AC136 frequently asked

What is Mode-S code 0AC136?
0AC136 is an ICAO 24-bit transponder address. Allocated to Costa Rica.
Where is Mode-S 0AC136 registered?
Mode-S code 0AC136 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 0AC136 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC136, octal 02540466, decimal 704,822.
What flights does 0AC136 operate?
Mode-S 0AC136 has broadcast 1 distinct callsign, including HK4803.