Apparatus

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sensors Mode-S transponder

04C309

ICAO 24-bit transponder address · allocated to Kenya

Currently assigned to 5Y-SXE · CESSNA 208 Caravan

Hex
04C309
Octal
01141411
Decimal
312,073
Country
KE
Tail
5Y-SXE
Type
C208
No current signal · last broadcast 4h ago
Flights observed
5
Distinct callsigns
1
Country
KE
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 04C309.

Country allocation

The ICAO 24-bit address 04C309 falls within the block assigned to Kenya (KE) by ICAO Annex 10, Volume III. Every aircraft registered in Kenya 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
5YSXE - 5 2026-06-11

Recent flights last 5

DateFlightRouteTakeoffLandingDuration
2026-06-11 5YSXE - Jun 11, 11:30 UTCJun 11, 12:00 UTC30m
2026-06-11 5YSXE - Jun 11, 05:55 UTCJun 11, 06:05 UTC10m
2026-05-24 5YSXE - May 24, 05:00 UTCMay 24, 05:10 UTC10m
2026-05-15 5YSXE - May 15, 08:55 UTCMay 15, 09:05 UTC10m
2026-05-06 5YSXE - May 6, 04:35 UTCMay 6, 04:45 UTC10m

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 5Y-SXE page for operator, model, and routing details .

Mode-S 04C309 frequently asked

What is Mode-S code 04C309?
04C309 is an ICAO 24-bit transponder address. Allocated to Kenya. Assigned to 5Y-SXE.
Where is Mode-S 04C309 registered?
Mode-S code 04C309 is allocated to Kenya (KE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 04C309 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 04C309, octal 01141411, decimal 312,073.
What flights does 04C309 operate?
Mode-S 04C309 has broadcast 1 distinct callsign, including 5YSXE.