sensors Mode-S transponder

4CAF14

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HSE · BOMBARDIER Regional Jet CRJ-900

Hex
4CAF14
Octal
23127424
Decimal
5,025,556
Country
IE
Tail
EI-HSE
Type
CRJ9
No current signal · last broadcast 17h ago
Flights observed
6
Distinct callsigns
3
Country
IE
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 4CAF14.

Country allocation

The ICAO 24-bit address 4CAF14 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 3 distinct

Callsign Airline Flights Last seen
SAS9240 Scandinavian Airlines System 2 2026-04-13
SAS745 - 2 2026-04-14
SAS744 Scandinavian Airlines System 2 2026-04-14

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-14 SAS745 - Apr 14, 09:10 UTCApr 14, 09:40 UTC30m
2026-04-14 SAS745 - Apr 14, 08:15 UTCApr 14, 09:05 UTC50m
2026-04-14 SAS744 CPH → VNO Apr 14, 07:10 UTCApr 14, 07:30 UTC20m
2026-04-14 SAS744 CPH → VNO Apr 14, 06:20 UTCApr 14, 07:10 UTC50m
2026-04-13 SAS9240 LHR → ARN Apr 13, 11:55 UTCApr 13, 12:10 UTC15m
2026-04-13 SAS9240 LHR → ARN Apr 13, 10:40 UTCApr 13, 12:10 UTC1h 30m

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

Mode-S 4CAF14 frequently asked

What is Mode-S code 4CAF14?
4CAF14 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HSE.
Where is Mode-S 4CAF14 registered?
Mode-S code 4CAF14 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAF14 broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAF14, octal 23127424, decimal 5,025,556.
What flights does 4CAF14 operate?
Mode-S 4CAF14 has broadcast 3 distinct callsigns, including SAS9240, SAS745, SAS744.