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sensors Mode-S transponder

4CAEF8

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-IRO · AGUSTA AW-189

Hex
4CAEF8
Octal
23127370
Decimal
5,025,528
Country
IE
Tail
EI-IRO
Type
A189
No current signal · last broadcast Jul 26, 17:35 UTC
Flights observed
176
Distinct callsigns
13
Country
IE
Last broadcast
Jul 26, 17:35 UTC

Last known position

Most recent position reported by Mode-S 4CAEF8.

Country allocation

The ICAO 24-bit address 4CAEF8 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 13 distinct

Callsign Airline Flights Last seen
CGI115 - 66 2026-07-09
CGI117 - 32 2026-07-26
RSQ115 - 26 2026-07-11
CGI116 - 23 2026-04-27
R115 - 8 2026-06-20
RSQ117 - 7 2026-07-26
RSQ116 - 5 2026-04-27
MED116 - 3 2026-04-22
CGI118 - 2 2026-07-25
RYR2EB Ryanair 1 2026-06-12
RSQ118 - 1 2026-07-24
R117 - 1 2026-07-21
EIIRO - 1 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RSQ117 - Jul 26, 16:10 UTCJul 26, 17:35 UTC1h 25m
2026-07-26 CGI117 - Jul 26, 15:00 UTCJul 26, 15:35 UTC35m
2026-07-26 CGI117 - Jul 26, 09:25 UTCJul 26, 09:50 UTC25m
2026-07-25 CGI117 - Jul 25, 13:35 UTCJul 25, 15:25 UTC1h 50m
2026-07-25 CGI118 - Jul 25, 10:30 UTCJul 25, 11:20 UTC50m
2026-07-24 RSQ118 - Jul 24, 21:35 UTCJul 24, 22:25 UTC50m
2026-07-24 CGI117 - Jul 24, 12:55 UTCJul 24, 14:00 UTC1h 5m
2026-07-23 CGI117 - Jul 23, 21:50 UTCJul 23, 22:30 UTC40m
2026-07-23 CGI117 - Jul 23, 20:35 UTCJul 23, 20:45 UTC10m
2026-07-23 CGI117 - Jul 23, 09:55 UTCJul 23, 11:10 UTC1h 15m
2026-07-22 CGI117 - Jul 22, 13:20 UTCJul 22, 15:00 UTC1h 40m
2026-07-21 R117 WAT → WAT Jul 21, 14:00 UTCJul 21, 15:05 UTC1h 5m
2026-07-21 CGI117 - Jul 21, 09:35 UTCJul 21, 09:45 UTC10m
2026-07-21 CGI117 - Jul 21, 08:40 UTCJul 21, 08:50 UTC10m
2026-07-20 CGI117 - Jul 20, 14:40 UTCJul 20, 15:40 UTC1h 0m
2026-07-20 CGI117 - Jul 20, 09:15 UTCJul 20, 10:10 UTC55m
2026-07-19 CGI117 WAT → WAT Jul 19, 13:40 UTCJul 19, 15:15 UTC1h 35m
2026-07-19 RSQ117 - Jul 19, 10:25 UTCJul 19, 10:35 UTC10m
2026-07-18 CGI117 - Jul 18, 15:00 UTCJul 18, 15:30 UTC30m
2026-07-18 CGI117 - Jul 18, 13:45 UTCJul 18, 14:05 UTC20m
2026-07-17 CGI117 - Jul 17, 22:00 UTCJul 17, 22:25 UTC25m
2026-07-17 CGI117 - Jul 17, 20:35 UTCJul 17, 21:20 UTC45m
2026-07-16 RSQ117 - Jul 16, 19:35 UTCJul 16, 20:25 UTC50m
2026-07-16 CGI117 WAT → WAT Jul 16, 16:09 UTCJul 16, 18:44 UTC2h 35m
2026-07-16 CGI117 WAT → WAT Jul 16, 08:40 UTCJul 16, 10:40 UTC2h 0m
2026-07-14 RSQ117 - Jul 14, 20:35 UTCJul 14, 22:35 UTC2h 0m
2026-07-14 RSQ117 - Jul 14, 19:00 UTCJul 14, 19:50 UTC50m
2026-07-14 CGI117 - Jul 14, 15:40 UTCJul 14, 16:05 UTC25m
2026-07-14 CGI117 - Jul 14, 14:20 UTCJul 14, 14:50 UTC30m
2026-07-13 CGI117 WAT → WAT Jul 13, 09:20 UTCJul 13, 11:05 UTC1h 45m
2026-07-12 RSQ117 - Jul 12, 17:10 UTCJul 12, 17:20 UTC10m
2026-07-12 RSQ117 - Jul 12, 15:15 UTCJul 12, 16:01 UTC45m
2026-07-12 CGI117 - Jul 12, 12:30 UTCJul 12, 13:05 UTC35m
2026-07-11 RSQ115 - Jul 11, 23:10 UTCJul 11, 23:30 UTC20m
2026-07-10 RSQ115 - Jul 10, 17:20 UTCJul 10, 17:45 UTC25m
2026-07-10 RSQ115 - Jul 10, 15:55 UTCJul 10, 16:30 UTC35m
2026-07-09 CGI115 - Jul 9, 15:10 UTCJul 9, 15:30 UTC20m
2026-07-09 CGI115 - Jul 9, 14:20 UTCJul 9, 14:40 UTC20m
2026-07-09 RSQ115 - Jul 9, 01:45 UTCJul 9, 02:55 UTC1h 10m
2026-07-08 RSQ115 - Jul 8, 19:35 UTCJul 8, 20:40 UTC1h 5m
2026-07-08 CGI115 - Jul 8, 19:10 UTCJul 8, 19:30 UTC20m
2026-07-08 CGI115 - Jul 8, 17:30 UTCJul 8, 18:00 UTC30m
2026-07-07 CGI115 - Jul 7, 18:35 UTCJul 7, 19:50 UTC1h 15m
2026-07-07 RSQ115 - Jul 7, 13:05 UTCJul 7, 14:20 UTC1h 15m
2026-07-07 CGI115 - Jul 7, 12:15 UTCJul 7, 12:25 UTC10m
2026-07-07 CGI117 - Jul 7, 11:30 UTCJul 7, 11:40 UTC10m
2026-07-06 CGI117 - Jul 6, 12:55 UTCJul 6, 13:05 UTC10m
2026-07-05 CGI117 - Jul 5, 17:25 UTCJul 5, 18:25 UTC1h 0m
2026-07-05 CGI117 - Jul 5, 16:30 UTCJul 5, 16:50 UTC20m
2026-07-05 CGI117 - Jul 5, 09:25 UTCJul 5, 09:35 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 EI-IRO page for operator, model, and routing details .

Mode-S 4CAEF8 frequently asked

What is Mode-S code 4CAEF8?
4CAEF8 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-IRO.
Where is Mode-S 4CAEF8 registered?
Mode-S code 4CAEF8 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAEF8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAEF8, octal 23127370, decimal 5,025,528.
What flights does 4CAEF8 operate?
Mode-S 4CAEF8 has broadcast 13 distinct callsigns, including CGI115, CGI117, RSQ115, CGI116, R115.