sensors Mode-S transponder

4CAEFF

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-MVF · AIRBUS A220-100

Hex
4CAEFF
Octal
23127377
Decimal
5,025,535
Country
IE
Tail
EI-MVF
Type
BCS1
No current signal · last broadcast 14h ago
Flights observed
14
Distinct callsigns
11
Country
IE
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 4CAEFF.

Country allocation

The ICAO 24-bit address 4CAEFF 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 11 distinct

Callsign Airline Flights Last seen
ITY221 - 2 2026-04-14
ITY218 ITA Airways 2 2026-04-14
ITY1184 - 2 2026-04-13
ITY1773 ITA Airways 1 2026-04-13
ITY1772 - 1 2026-04-13
ITY1392 - 1 2026-04-12
ITY1298 - 1 2026-04-13
ITY1291 - 1 2026-04-13
ITY1278 - 1 2026-04-13
ITY1267 - 1 2026-04-12
ITY1185 - 1 2026-04-13

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-14 ITY221 - Apr 14, 09:10 UTCApr 14, 09:50 UTC40m
2026-04-14 ITY221 - Apr 14, 08:20 UTCApr 14, 09:05 UTC45m
2026-04-14 ITY218 LIN → LCY Apr 14, 07:10 UTCApr 14, 07:20 UTC10m
2026-04-14 ITY218 LIN → LCY Apr 14, 05:50 UTCApr 14, 07:10 UTC1h 20m
2026-04-13 ITY1298 - Apr 13, 20:10 UTCApr 13, 21:05 UTC55m
2026-04-13 ITY1291 - Apr 13, 17:50 UTCApr 13, 18:40 UTC50m
2026-04-13 ITY1184 - Apr 13, 15:50 UTCApr 13, 16:10 UTC20m
2026-04-13 ITY1184 - Apr 13, 14:50 UTCApr 13, 16:10 UTC1h 20m
2026-04-13 ITY1185 - Apr 13, 12:20 UTCApr 13, 13:45 UTC1h 25m
2026-04-13 ITY1772 - Apr 13, 09:40 UTCApr 13, 10:50 UTC1h 10m
2026-04-13 ITY1773 LIN → PMO Apr 13, 06:35 UTCApr 13, 08:00 UTC1h 25m
2026-04-13 ITY1278 - Apr 13, 04:30 UTCApr 13, 05:25 UTC55m
2026-04-12 ITY1267 - Apr 12, 20:05 UTCApr 12, 20:15 UTC10m
2026-04-12 ITY1392 - Apr 12, 17:40 UTCApr 12, 18:25 UTC45m

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-MVF page for operator, model, and routing details .

Mode-S 4CAEFF frequently asked

What is Mode-S code 4CAEFF?
4CAEFF is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-MVF.
Where is Mode-S 4CAEFF registered?
Mode-S code 4CAEFF is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAEFF broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAEFF, octal 23127377, decimal 5,025,535.
What flights does 4CAEFF operate?
Mode-S 4CAEFF has broadcast 11 distinct callsigns, including ITY221, ITY218, ITY1184, ITY1773, ITY1772.