sensors Mode-S transponder

4CAFF8

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-ILI · BOEING 737 MAX 8

Hex
4CAFF8
Octal
23127770
Decimal
5,025,784
Country
IE
Tail
EI-ILI
Type
B38M
Broadcasting now · callsign RYR77KA · 40,000 ft
Flights observed
17
Distinct callsigns
12
Country
IE
Last broadcast
19h ago

Current position

4CAFF8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAFF8 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 12 distinct

Callsign Airline Flights Last seen
RYR2MT - 3 2026-04-13
RYR9DL - 2 2026-04-13
RYR5EB - 2 2026-04-14
RYR352 Ryanair 2 2026-04-13
RYR9QV - 1 2026-04-13
RYR8VV - 1 2026-04-13
RYR78FG - 1 2026-04-12
RYR7419 - 1 2026-04-12
RYR7406 - 1 2026-04-13
RYR64JM - 1 2026-04-13
RYR3419 - 1 2026-04-14
RYR30AM - 1 2026-04-13

Recent flights last 17

DateFlightRouteTakeoffLandingDuration
2026-04-14 RYR5EB - Apr 14, 09:10 UTCApr 14, 10:05 UTC55m
2026-04-14 RYR5EB - Apr 14, 07:25 UTCApr 14, 09:05 UTC1h 40m
2026-04-14 RYR3419 - Apr 14, 05:15 UTCApr 14, 06:35 UTC1h 20m
2026-04-13 RYR7406 - Apr 13, 21:50 UTCApr 13, 23:00 UTC1h 10m
2026-04-13 RYR9DL - Apr 13, 19:50 UTCApr 13, 20:55 UTC1h 5m
2026-04-13 RYR9DL - Apr 13, 19:35 UTCApr 13, 20:10 UTC35m
2026-04-13 RYR30AM - Apr 13, 17:15 UTCApr 13, 18:30 UTC1h 15m
2026-04-13 RYR8VV - Apr 13, 14:35 UTCApr 13, 15:55 UTC1h 20m
2026-04-13 RYR2MT - Apr 13, 12:20 UTCApr 13, 13:15 UTC55m
2026-04-13 RYR2MT - Apr 13, 11:55 UTCApr 13, 13:15 UTC1h 20m
2026-04-13 RYR2MT - Apr 13, 11:20 UTCApr 13, 12:15 UTC55m
2026-04-13 RYR64JM - Apr 13, 08:45 UTCApr 13, 10:35 UTC1h 50m
2026-04-13 RYR9QV - Apr 13, 06:20 UTCApr 13, 07:35 UTC1h 15m
2026-04-13 RYR352 RHO → BER Apr 13, 04:20 UTCApr 13, 05:25 UTC1h 5m
2026-04-13 RYR352 RHO → BER Apr 13, 04:10 UTCApr 13, 05:25 UTC1h 15m
2026-04-12 RYR7419 PMI → OPO Apr 12, 18:40 UTCApr 12, 20:15 UTC1h 35m
2026-04-12 RYR78FG - Apr 12, 17:15 UTCApr 12, 17:35 UTC20m

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

Mode-S 4CAFF8 frequently asked

What is Mode-S code 4CAFF8?
4CAFF8 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-ILI.
Where is Mode-S 4CAFF8 registered?
Mode-S code 4CAFF8 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFF8 broadcasting right now?
Yes. Mode-S 4CAFF8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFF8, octal 23127770, decimal 5,025,784.
What flights does 4CAFF8 operate?
Mode-S 4CAFF8 has broadcast 12 distinct callsigns, including RYR2MT, RYR9DL, RYR5EB, RYR352, RYR9QV.