sensors Mode-S transponder

4CAF29

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-ILO · BOEING 737 MAX 8

Hex
4CAF29
Octal
23127451
Decimal
5,025,577
Country
IE
Tail
EI-ILO
Type
B38M
No current signal · last broadcast 20h ago
Flights observed
17
Distinct callsigns
11
Country
IE
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 4CAF29.

Country allocation

The ICAO 24-bit address 4CAF29 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
RYR451P - 3 2026-04-13
RYR6091 - 2 2026-04-14
RYR4AY - 2 2026-04-13
RYR2TV - 2 2026-04-13
RYR2261 - 2 2026-04-13
RYR8479 - 1 2026-04-13
RYR6466 - 1 2026-04-12
RYR4NM - 1 2026-04-12
RYR394R - 1 2026-04-13
RYR35ZQ Ryanair 1 2026-04-13
RYR33FG Ryanair 1 2026-04-13

Recent flights last 17

DateFlightRouteTakeoffLandingDuration
2026-04-14 RYR6091 - Apr 14, 07:10 UTCApr 14, 07:40 UTC30m
2026-04-14 RYR6091 - Apr 14, 05:20 UTCApr 14, 07:10 UTC1h 50m
2026-04-13 RYR35ZQ WMI → BGY Apr 13, 20:35 UTCApr 13, 22:15 UTC1h 40m
2026-04-13 RYR4AY - Apr 13, 19:45 UTCApr 13, 19:55 UTC10m
2026-04-13 RYR4AY - Apr 13, 18:20 UTCApr 13, 19:55 UTC1h 35m
2026-04-13 RYR2TV - Apr 13, 16:15 UTCApr 13, 17:20 UTC1h 5m
2026-04-13 RYR2TV - Apr 13, 16:05 UTCApr 13, 16:15 UTC10m
2026-04-13 RYR8479 - Apr 13, 13:40 UTCApr 13, 14:50 UTC1h 10m
2026-04-13 RYR451P - Apr 13, 12:20 UTCApr 13, 12:45 UTC25m
2026-04-13 RYR451P - Apr 13, 11:55 UTCApr 13, 12:45 UTC50m
2026-04-13 RYR451P - Apr 13, 11:15 UTCApr 13, 12:15 UTC1h 0m
2026-04-13 RYR394R - Apr 13, 08:40 UTCApr 13, 10:05 UTC1h 25m
2026-04-13 RYR33FG CTA → BGY Apr 13, 06:20 UTCApr 13, 07:45 UTC1h 25m
2026-04-13 RYR2261 - Apr 13, 04:20 UTCApr 13, 05:20 UTC1h 0m
2026-04-13 RYR2261 - Apr 13, 03:55 UTCApr 13, 04:15 UTC20m
2026-04-12 RYR4NM - Apr 12, 19:25 UTCApr 12, 20:15 UTC50m
2026-04-12 RYR6466 - Apr 12, 17:15 UTCApr 12, 18:30 UTC1h 15m

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

Mode-S 4CAF29 frequently asked

What is Mode-S code 4CAF29?
4CAF29 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-ILO.
Where is Mode-S 4CAF29 registered?
Mode-S code 4CAF29 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAF29 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAF29, octal 23127451, decimal 5,025,577.
What flights does 4CAF29 operate?
Mode-S 4CAF29 has broadcast 11 distinct callsigns, including RYR451P, RYR6091, RYR4AY, RYR2TV, RYR2261.