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sensors Mode-S transponder

4CA566

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-DWA · BOEING 737-800

Hex
4CA566
Octal
23122546
Decimal
5,023,078
Country
IE
Tail
EI-DWA
Type
B738
Broadcasting now · callsign RYR74HE · 38,000 ft
Flights observed
689
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 20:40 UTC

Current position

4CA566 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CA566 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 20 distinct

Callsign Airline Flights Last seen
RYR42UH Ryanair 7 2026-07-26
RYR34JJ Ryanair 7 2026-07-26
RYR97TZ Ryanair 5 2026-05-21
RYR6VN Ryanair 5 2026-05-21
RYR3RU Ryanair 5 2026-04-21
RYR6RX Ryanair 4 2026-07-23
RYR6HQ Ryanair 4 2026-05-18
RYR5QY Ryanair 4 2026-04-18
RYR56EF Ryanair 4 2026-07-23
RYR4RA Ryanair 4 2026-04-18
RYR41LL - 4 2026-07-18
RYR3HB Ryanair 4 2026-04-21
RYR2EE Ryanair 4 2026-05-18
RYR27TT Ryanair 4 2026-05-21
RYR19EN Ryanair 4 2026-05-21
RYR93SK Ryanair 3 2026-05-18
RYR92EQ Ryanair 3 2026-04-17
RYR8YF Ryanair 3 2026-06-12
RYR8PY Ryanair 3 2026-07-20
RYR8LW Ryanair 3 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR53YT MAD → FCO Jul 26, 18:50 UTCJul 26, 20:40 UTC1h 50m
2026-07-26 RYR7AL SJJ → ARN Jul 26, 15:15 UTCJul 26, 17:15 UTC2h 0m
2026-07-26 RYR5UP MLA → FCO Jul 26, 13:00 UTCJul 26, 14:05 UTC1h 5m
2026-07-26 RYR85JL FCO → MLA Jul 26, 11:05 UTCJul 26, 12:05 UTC1h 0m
2026-07-26 RYR42UH AGP → FCO Jul 26, 08:00 UTCJul 26, 10:30 UTC2h 30m
2026-07-26 RYR34JJ FCO → AGP Jul 26, 04:20 UTCJul 26, 06:40 UTC2h 21m
2026-07-25 RYR4NH CRL → ARN Jul 25, 19:55 UTCJul 25, 21:45 UTC1h 50m
2026-07-25 RYR2AU SJJ → GOT Jul 25, 16:30 UTCJul 25, 18:50 UTC2h 20m
2026-07-25 RYR71LM VLC → FCO Jul 25, 13:35 UTCJul 25, 14:55 UTC1h 20m
2026-07-25 RYR1FF MAD → BOD Jul 25, 10:55 UTCJul 25, 12:40 UTC1h 45m
2026-07-25 RYR17VM BVA → FCO Jul 25, 08:00 UTCJul 25, 09:40 UTC1h 40m
2026-07-25 RYR8DN FCO → BVA Jul 25, 05:20 UTCJul 25, 07:05 UTC1h 45m
2026-07-24 RYR42UH AGP → FCO Jul 24, 18:55 UTCJul 24, 20:50 UTC1h 55m
2026-07-24 RYR34JJ FCO → AGP Jul 24, 15:25 UTCJul 24, 17:50 UTC2h 25m
2026-07-24 RYR5SM FAO → STN Jul 24, 13:20 UTCJul 24, 14:20 UTC1h 0m
2026-07-24 RYR4YF TNG → NRN Jul 24, 11:35 UTCJul 24, 12:20 UTC45m
2026-07-24 RYR6929 - Jul 24, 07:15 UTCJul 24, 09:05 UTC1h 50m
2026-07-24 RYR6928 - Jul 24, 04:00 UTCJul 24, 06:20 UTC2h 20m
2026-07-23 RYR49AV MAD → FCO Jul 23, 21:05 UTCJul 23, 22:55 UTC1h 50m
2026-07-23 RYR4VX BDS → EIN Jul 23, 17:35 UTCJul 23, 19:45 UTC2h 10m
2026-07-23 RYR5UP MLA → FCO Jul 23, 15:05 UTCJul 23, 16:15 UTC1h 10m
2026-07-23 RYR85JL FCO → MLA Jul 23, 13:15 UTCJul 23, 14:15 UTC1h 0m
2026-07-23 RYR6RX BGY → KRK Jul 23, 10:00 UTCJul 23, 11:05 UTC1h 5m
2026-07-23 RYR56EF FCO → CTA Jul 23, 08:00 UTCJul 23, 08:50 UTC50m
2026-07-23 RYR83VW BDS → FCO Jul 23, 05:30 UTCJul 23, 06:20 UTC50m
2026-07-23 RYR3074 FCO → BDS Jul 23, 04:00 UTCJul 23, 04:40 UTC40m
2026-07-22 RYR88FD VLC → FCO Jul 22, 21:20 UTCJul 22, 22:45 UTC1h 25m
2026-07-22 RYR4SB HAM → AGP Jul 22, 18:55 UTCJul 22, 20:35 UTC1h 40m
2026-07-22 RYR6RX BGY → KRK Jul 22, 16:30 UTCJul 22, 17:35 UTC1h 5m
2026-07-22 RYR56EF FCO → CTA Jul 22, 14:25 UTCJul 22, 15:15 UTC50m
2026-07-22 RYR5HE NAP → CFU Jul 22, 10:20 UTCJul 22, 12:15 UTC1h 55m
2026-07-21 RYR4WT STN → BUD Jul 21, 22:00 UTCJul 21, 22:55 UTC55m
2026-07-21 RYR75EU FCO → CTA Jul 21, 19:55 UTCJul 21, 20:50 UTC55m
2026-07-21 RYR2EC - Jul 21, 18:10 UTCJul 21, 19:00 UTC50m
2026-07-21 RYR50CL - Jul 21, 16:20 UTCJul 21, 17:00 UTC40m
2026-07-21 RYR1VB PMO → FCO Jul 21, 14:20 UTCJul 21, 15:00 UTC40m
2026-07-21 RYR65QN FCO → PMO Jul 21, 12:35 UTCJul 21, 13:15 UTC40m
2026-07-21 RYR5HE NAP → CFU Jul 21, 09:00 UTCJul 21, 11:20 UTC2h 20m
2026-07-21 RYR24SE - Jul 21, 05:10 UTCJul 21, 07:55 UTC2h 45m
2026-07-20 RYR8PY FKB → TFS Jul 20, 23:25 UTCJul 21, 00:10 UTC44m
2026-07-20 RYR75TP FCO → PMO Jul 20, 21:40 UTCJul 20, 22:25 UTC45m
2026-07-20 RYR87CK RHO → FCO Jul 20, 18:25 UTCJul 20, 20:30 UTC2h 5m
2026-07-20 RYR499 DUB → PSA Jul 20, 15:25 UTCJul 20, 17:20 UTC1h 55m
2026-07-20 RYR17VM BVA → FCO Jul 20, 12:20 UTCJul 20, 13:55 UTC1h 35m
2026-07-20 RYR8DN FCO → BVA Jul 20, 09:35 UTCJul 20, 11:20 UTC1h 45m
2026-07-20 RYR9GH ALC → MAN Jul 20, 06:55 UTCJul 20, 08:25 UTC1h 30m
2026-07-20 RYR87PG FCO → EFL Jul 20, 04:45 UTCJul 20, 05:55 UTC1h 10m
2026-07-19 RYR29SA - Jul 19, 23:40 UTCJul 20, 00:20 UTC40m
2026-07-19 RYR78YR - Jul 19, 21:30 UTCJul 19, 22:10 UTC40m
2026-07-19 RYR53YT MAD → FCO Jul 19, 18:35 UTCJul 19, 20:15 UTC1h 40m

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

Mode-S 4CA566 frequently asked

What is Mode-S code 4CA566?
4CA566 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-DWA.
Where is Mode-S 4CA566 registered?
Mode-S code 4CA566 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA566 broadcasting right now?
Yes. Mode-S 4CA566 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA566, octal 23122546, decimal 5,023,078.
What flights does 4CA566 operate?
Mode-S 4CA566 has broadcast 20 distinct callsigns, including RYR42UH, RYR34JJ, RYR97TZ, RYR6VN, RYR3RU.