sensors Mode-S transponder

4CAF13

ICAO 24-bit transponder address · allocated to Ireland

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

Hex
4CAF13
Octal
23127423
Decimal
5,025,555
Country
IE
Tail
EI-HSC
Type
CRJ9
No current signal · last broadcast 13h ago
Flights observed
14
Distinct callsigns
8
Country
IE
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 4CAF13.

Country allocation

The ICAO 24-bit address 4CAF13 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 8 distinct

Callsign Airline Flights Last seen
SAS743 - 3 2026-04-13
SAS86P - 2 2026-04-13
SAS745 - 2 2026-04-13
SAS658 - 2 2026-04-14
SAS657 - 2 2026-04-14
SAS744 Scandinavian Airlines System 1 2026-04-13
SAS696 - 1 2026-04-12
SAS668 - 1 2026-04-13

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-14 SAS658 - Apr 14, 09:10 UTCApr 14, 09:50 UTC40m
2026-04-14 SAS658 - Apr 14, 08:35 UTCApr 14, 09:05 UTC30m
2026-04-14 SAS657 - Apr 14, 07:10 UTCApr 14, 07:45 UTC35m
2026-04-14 SAS657 - Apr 14, 06:25 UTCApr 14, 07:10 UTC45m
2026-04-13 SAS668 - Apr 13, 14:00 UTCApr 13, 15:15 UTC1h 15m
2026-04-13 SAS86P - Apr 13, 12:20 UTCApr 13, 13:15 UTC55m
2026-04-13 SAS86P - Apr 13, 11:55 UTCApr 13, 12:15 UTC20m
2026-04-13 SAS745 - Apr 13, 08:20 UTCApr 13, 09:30 UTC1h 10m
2026-04-13 SAS745 - Apr 13, 08:05 UTCApr 13, 08:15 UTC10m
2026-04-13 SAS744 CPH → VNO Apr 13, 06:05 UTCApr 13, 07:15 UTC1h 10m
2026-04-13 SAS743 - Apr 13, 04:20 UTCApr 13, 04:40 UTC20m
2026-04-13 SAS743 - Apr 13, 03:55 UTCApr 13, 04:40 UTC45m
2026-04-13 SAS743 - Apr 13, 03:20 UTCApr 13, 04:15 UTC55m
2026-04-12 SAS696 VIE → CPH Apr 12, 18:15 UTCApr 12, 19:40 UTC1h 25m

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

Mode-S 4CAF13 frequently asked

What is Mode-S code 4CAF13?
4CAF13 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HSC.
Where is Mode-S 4CAF13 registered?
Mode-S code 4CAF13 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAF13 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAF13, octal 23127423, decimal 5,025,555.
What flights does 4CAF13 operate?
Mode-S 4CAF13 has broadcast 8 distinct callsigns, including SAS743, SAS86P, SAS745, SAS658, SAS657.