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sensors Mode-S transponder

4CA44A

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to 288 · DE HAVILLAND DHC-6 Twin Otter

Hex
4CA44A
Octal
23122112
Decimal
5,022,794
Country
IE
Tail
288
Type
DHC6
No current signal · last broadcast 1d ago
Flights observed
118
Distinct callsigns
4
Country
IE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4CA44A.

Country allocation

The ICAO 24-bit address 4CA44A falls within the block assigned to Ireland (IE) by ICAO Annex 10, Volume III. Every aircraft registered in Ireland 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 4 distinct

Callsign Airline Flights Last seen
O288 - 91 2026-07-17
000288 - 10 2026-07-03
0288 - 9 2026-07-02
IRL288 - 8 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 O288 - Jul 17, 14:35 UTCJul 17, 16:04 UTC1h 30m
2026-07-17 O288 - Jul 17, 08:59 UTCJul 17, 10:50 UTC1h 50m
2026-07-16 O288 - Jul 16, 15:40 UTCJul 16, 17:00 UTC1h 20m
2026-07-16 O288 - Jul 16, 09:35 UTCJul 16, 10:10 UTC35m
2026-07-15 O288 - Jul 15, 14:40 UTCJul 15, 16:15 UTC1h 35m
2026-07-15 O288 - Jul 15, 10:45 UTCJul 15, 12:20 UTC1h 35m
2026-07-13 O288 - Jul 13, 14:45 UTCJul 13, 16:20 UTC1h 35m
2026-07-13 O288 - Jul 13, 11:20 UTCJul 13, 13:25 UTC2h 5m
2026-07-13 O288 - Jul 13, 09:30 UTCJul 13, 10:10 UTC40m
2026-07-10 O288 - Jul 10, 14:35 UTCJul 10, 15:30 UTC55m
2026-07-10 O288 - Jul 10, 11:30 UTCJul 10, 13:20 UTC1h 50m
2026-07-10 O288 - Jul 10, 09:15 UTCJul 10, 09:50 UTC35m
2026-07-08 O288 - Jul 8, 12:15 UTCJul 8, 13:25 UTC1h 10m
2026-07-08 O288 - Jul 8, 10:35 UTCJul 8, 11:20 UTC45m
2026-07-07 O288 - Jul 7, 10:50 UTCJul 7, 14:55 UTC4h 5m
2026-07-06 O288 - Jul 6, 14:30 UTCJul 6, 15:15 UTC45m
2026-07-06 O288 - Jul 6, 12:15 UTCJul 6, 13:25 UTC1h 10m
2026-07-06 O288 - Jul 6, 06:20 UTCJul 6, 08:30 UTC2h 10m
2026-07-03 000288 - Jul 3, 11:45 UTCJul 3, 15:05 UTC3h 20m
2026-07-03 O288 - Jul 3, 08:20 UTCJul 3, 09:50 UTC1h 30m
2026-07-02 O288 - Jul 2, 14:15 UTCJul 2, 17:45 UTC3h 30m
2026-07-02 0288 - Jul 2, 09:10 UTCJul 2, 11:00 UTC1h 50m
2026-07-01 O288 - Jul 1, 16:30 UTCJul 1, 17:50 UTC1h 20m
2026-07-01 O288 - Jul 1, 15:30 UTCJul 1, 16:10 UTC40m
2026-07-01 O288 - Jul 1, 12:05 UTCJul 1, 13:05 UTC1h 0m
2026-07-01 O288 - Jul 1, 09:15 UTCJul 1, 11:15 UTC2h 0m
2026-06-30 O288 - Jun 30, 11:45 UTCJun 30, 13:20 UTC1h 35m
2026-06-29 O288 - Jun 29, 12:39 UTCJun 29, 13:44 UTC1h 5m
2026-06-29 O288 - Jun 29, 09:40 UTCJun 29, 10:44 UTC1h 5m
2026-06-26 O288 - Jun 26, 12:19 UTCJun 26, 13:34 UTC1h 15m
2026-06-26 O288 - Jun 26, 09:39 UTCJun 26, 10:35 UTC55m
2026-06-25 O288 - Jun 25, 14:55 UTCJun 25, 15:50 UTC55m
2026-06-25 O288 - Jun 25, 13:45 UTCJun 25, 14:29 UTC45m
2026-06-24 O288 - Jun 24, 14:15 UTCJun 24, 14:55 UTC40m
2026-06-24 O288 - Jun 24, 13:20 UTCJun 24, 13:34 UTC15m
2026-06-24 O288 - Jun 24, 11:05 UTCJun 24, 12:09 UTC1h 5m
2026-06-23 O288 - Jun 23, 13:24 UTCJun 23, 14:35 UTC1h 10m
2026-06-22 O288 - Jun 22, 13:29 UTCJun 22, 16:24 UTC2h 55m
2026-06-22 O288 - Jun 22, 10:19 UTCJun 22, 12:05 UTC1h 45m
2026-06-20 O288 - Jun 20, 17:39 UTCJun 20, 18:34 UTC55m
2026-06-20 O288 - Jun 20, 11:59 UTCJun 20, 13:49 UTC1h 50m
2026-06-18 0288 - Jun 18, 13:25 UTCJun 18, 15:05 UTC1h 40m
2026-06-17 0288 - Jun 17, 13:20 UTCJun 17, 14:15 UTC55m
2026-06-17 O288 - Jun 17, 09:40 UTCJun 17, 11:40 UTC2h 0m
2026-06-15 O288 - Jun 15, 12:35 UTCJun 15, 13:40 UTC1h 5m
2026-06-15 O288 - Jun 15, 08:40 UTCJun 15, 11:24 UTC2h 45m
2026-06-14 O288 - Jun 14, 14:40 UTCJun 14, 17:50 UTC3h 10m
2026-06-14 O288 - Jun 14, 07:20 UTCJun 14, 12:05 UTC4h 45m
2026-06-11 O288 - Jun 11, 12:25 UTCJun 11, 13:10 UTC45m
2026-06-10 O288 - Jun 10, 12:50 UTCJun 10, 13:25 UTC35m

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 288 page for operator, model, and routing details .

Mode-S 4CA44A frequently asked

What is Mode-S code 4CA44A?
4CA44A is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to 288.
Where is Mode-S 4CA44A registered?
Mode-S code 4CA44A is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA44A broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA44A, octal 23122112, decimal 5,022,794.
What flights does 4CA44A operate?
Mode-S 4CA44A has broadcast 4 distinct callsigns, including O288, 000288, 0288, IRL288.