sensors Mode-S transponder

4CAE66

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-IJR · BOEING 737 MAX 8

Hex
4CAE66
Octal
23127146
Decimal
5,025,382
Country
IE
Tail
EI-IJR
Type
B38M
Broadcasting now · callsign RYR4ZQ · 38,000 ft
Flights observed
18
Distinct callsigns
11
Country
IE
Last broadcast
12h ago

Current position

4CAE66 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAE66 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
RYR95TC - 3 2026-04-14
RYR2KZ Ryanair 3 2026-04-13
RYR10TY - 3 2026-04-13
RYR41MR - 2 2026-04-13
RYR99SD - 1 2026-04-13
RYR86JJ - 1 2026-04-12
RYR5JX - 1 2026-04-12
RYR55RY - 1 2026-04-13
RYR4NJ - 1 2026-04-14
RYR31XB - 1 2026-04-12
RYR17PE - 1 2026-04-13

Recent flights last 18

DateFlightRouteTakeoffLandingDuration
2026-04-14 RYR4NJ - Apr 14, 10:50 UTCApr 14, 11:05 UTC15m
2026-04-14 RYR95TC - Apr 14, 09:10 UTCApr 14, 09:25 UTC15m
2026-04-14 RYR95TC - Apr 14, 07:10 UTCApr 14, 09:05 UTC1h 55m
2026-04-14 RYR95TC - Apr 14, 06:20 UTCApr 14, 07:10 UTC50m
2026-04-13 RYR17PE - Apr 13, 21:05 UTCApr 13, 23:05 UTC2h 0m
2026-04-13 RYR41MR - Apr 13, 19:50 UTCApr 13, 20:00 UTC10m
2026-04-13 RYR41MR - Apr 13, 18:20 UTCApr 13, 20:00 UTC1h 40m
2026-04-13 RYR10TY NIT → MAN Apr 13, 16:15 UTCApr 13, 17:25 UTC1h 10m
2026-04-13 RYR10TY - Apr 13, 15:50 UTCApr 13, 17:25 UTC1h 35m
2026-04-13 RYR10TY BCN → NIT Apr 13, 15:25 UTCApr 13, 16:15 UTC50m
2026-04-13 RYR99SD MAN → BCN Apr 13, 12:25 UTCApr 13, 14:15 UTC1h 50m
2026-04-13 RYR55RY - Apr 13, 10:00 UTCApr 13, 11:35 UTC1h 35m
2026-04-13 RYR2KZ AGP → BFS Apr 13, 08:20 UTCApr 13, 09:05 UTC45m
2026-04-13 RYR2KZ AGP → BFS Apr 13, 07:55 UTCApr 13, 09:05 UTC1h 10m
2026-04-13 RYR2KZ AGP → BFS Apr 13, 07:40 UTCApr 13, 08:15 UTC35m
2026-04-12 RYR31XB - Apr 12, 23:55 UTCApr 13, 00:05 UTC10m
2026-04-12 RYR86JJ - Apr 12, 19:25 UTCApr 12, 20:15 UTC50m
2026-04-12 RYR5JX - Apr 12, 17:15 UTCApr 12, 18:25 UTC1h 10m

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

Mode-S 4CAE66 frequently asked

What is Mode-S code 4CAE66?
4CAE66 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-IJR.
Where is Mode-S 4CAE66 registered?
Mode-S code 4CAE66 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAE66 broadcasting right now?
Yes. Mode-S 4CAE66 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAE66, octal 23127146, decimal 5,025,382.
What flights does 4CAE66 operate?
Mode-S 4CAE66 has broadcast 11 distinct callsigns, including RYR95TC, RYR2KZ, RYR10TY, RYR41MR, RYR99SD.