Apparatus

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sensors Mode-S transponder

4CA7B3

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-EFX · BOEING 737-800

Hex
4CA7B3
Octal
23123663
Decimal
5,023,667
Country
IE
Tail
EI-EFX
Type
B738
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
664
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 4CA7B3.

Country allocation

The ICAO 24-bit address 4CA7B3 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
RYR615 Ryanair 4 2026-06-08
RYR6002 Ryanair 4 2026-05-11
RYR54JB Ryanair 4 2026-05-11
RYR19KU Ryanair 4 2026-06-08
RYR14RG Ryanair 4 2026-06-07
RYR9SV Ryanair 3 2026-04-29
RYR9538 Ryanair 3 2026-05-14
RYR91KF Ryanair 3 2026-06-11
RYR8CD Ryanair 3 2026-05-12
RYR78LL Ryanair 3 2026-06-11
RYR77GB Ryanair 3 2026-07-24
RYR772F Ryanair 3 2026-04-27
RYR7401 Ryanair 3 2026-06-11
RYR6GM Ryanair 3 2026-05-10
RYR6DN Ryanair 3 2026-05-11
RYR65YK Ryanair 3 2026-06-12
RYR65FR Ryanair 3 2026-06-12
RYR63UT Ryanair 3 2026-05-10
RYR5PV Ryanair 3 2026-05-11
RYR5FV - 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR56UH CHQ → MAN Jul 26, 20:50 UTCJul 26, 22:45 UTC1h 55m
2026-07-26 RYR4432 STN → TLL Jul 26, 15:55 UTCJul 26, 19:10 UTC3h 15m
2026-07-26 RYR55RY CPH → MAN Jul 26, 11:15 UTCJul 26, 12:45 UTC1h 30m
2026-07-26 RYR2KZ AGP → BFS Jul 26, 09:00 UTCJul 26, 10:20 UTC1h 20m
2026-07-26 RYR90QC DUB → PFO Jul 26, 06:45 UTCJul 26, 07:50 UTC1h 5m
2026-07-26 RYR70CB GRO → EIN Jul 26, 04:55 UTCJul 26, 05:50 UTC55m
2026-07-25 RYR9CZ BER → VNO Jul 25, 17:50 UTCJul 25, 20:25 UTC2h 35m
2026-07-25 RYR12SN MRS → MLA Jul 25, 14:10 UTCJul 25, 16:25 UTC2h 15m
2026-07-25 RYR367K ZAD → MAN Jul 25, 10:15 UTCJul 25, 12:30 UTC2h 15m
2026-07-25 RYR9501 MAN → ZAD Jul 25, 07:10 UTCJul 25, 09:10 UTC2h 0m
2026-07-24 RYR2QB ARN → STN Jul 24, 21:15 UTCJul 24, 22:10 UTC55m
2026-07-24 RYR92LR MAN → BVA Jul 24, 19:15 UTCJul 24, 20:05 UTC50m
2026-07-24 RYR84LQ - Jul 24, 16:10 UTCJul 24, 18:05 UTC1h 55m
2026-07-24 RYR64VR MAD → IBZ Jul 24, 13:10 UTCJul 24, 15:10 UTC2h 0m
2026-07-24 RYR4KN DUB → FRA Jul 24, 11:10 UTCJul 24, 11:45 UTC35m
2026-07-24 RYR77GB MAN → DUB Jul 24, 09:40 UTCJul 24, 10:20 UTC40m
2026-07-24 RUK768 ORK → MAN Jul 24, 08:05 UTCJul 24, 09:00 UTC55m
2026-07-24 RUK767 MAN → ORK Jul 24, 06:40 UTCJul 24, 07:30 UTC50m
2026-07-23 RUK3UE BFS → MAN Jul 23, 23:30 UTCJul 24, 00:05 UTC35m
2026-07-23 RUK3GZ MAN → BFS Jul 23, 22:10 UTCJul 23, 22:45 UTC35m
2026-07-23 RYR604V CDT → MAN Jul 23, 18:00 UTCJul 23, 20:00 UTC2h 0m
2026-07-23 RYR685J MAN → CDT Jul 23, 15:00 UTCJul 23, 17:00 UTC2h 0m
2026-07-23 RYR4SD - Jul 23, 13:05 UTCJul 23, 14:05 UTC1h 0m
2026-07-23 RYR46TF MAN → CRL Jul 23, 11:15 UTCJul 23, 12:15 UTC1h 0m
2026-07-23 RYR83WC GOA → MAN Jul 23, 08:15 UTCJul 23, 10:10 UTC1h 55m
2026-07-23 RYR6983 MAN → GOA Jul 23, 05:40 UTCJul 23, 07:25 UTC1h 45m
2026-07-22 RYR7SG BCN → PIK Jul 22, 18:40 UTCJul 22, 20:50 UTC2h 10m
2026-07-22 RYR4DB DUB → LGW Jul 22, 15:25 UTCJul 22, 17:55 UTC2h 30m
2026-07-22 RYR1QD STN → BZG Jul 22, 13:00 UTCJul 22, 13:55 UTC55m
2026-07-22 RYR22KC - Jul 22, 11:30 UTCJul 22, 12:15 UTC45m
2026-07-21 RYR88FE - Jul 21, 19:45 UTCJul 21, 22:15 UTC2h 30m
2026-07-21 RYR99RH - Jul 21, 16:25 UTCJul 21, 18:55 UTC2h 30m
2026-07-21 RYR7547 - Jul 21, 13:00 UTCJul 21, 14:50 UTC1h 50m
2026-07-21 RYR467M MAN → POZ Jul 21, 10:20 UTCJul 21, 12:15 UTC1h 55m
2026-07-21 RYR90QC - Jul 21, 08:35 UTCJul 21, 09:35 UTC1h 0m
2026-07-21 RYR70CB GRO → EIN Jul 21, 06:40 UTCJul 21, 07:40 UTC1h 0m
2026-07-20 RYR4NJ VRN → BHX Jul 20, 17:55 UTCJul 20, 21:10 UTC3h 15m
2026-07-20 RYR95TC MAN → MLA Jul 20, 14:05 UTCJul 20, 17:05 UTC3h 0m
2026-07-20 RYR405U ORK → MAN Jul 20, 10:55 UTCJul 20, 11:45 UTC50m
2026-07-20 RYR14QA MAN → ORK Jul 20, 09:20 UTCJul 20, 10:10 UTC50m
2026-07-20 RYR390A EIN → MAN Jul 20, 07:30 UTCJul 20, 08:25 UTC55m
2026-07-20 RYR6CU FCO → PMI Jul 20, 05:40 UTCJul 20, 06:35 UTC55m
2026-07-19 RYR17WW BCN → MAN Jul 19, 21:40 UTCJul 19, 23:45 UTC2h 5m
2026-07-19 RYR7542 MAN → BCN Jul 19, 18:45 UTCJul 19, 20:40 UTC1h 55m
2026-07-19 RYR61UR IBZ → MAN Jul 19, 15:30 UTCJul 19, 17:45 UTC2h 15m
2026-07-19 RYR2626 - Jul 19, 12:15 UTCJul 19, 14:30 UTC2h 15m
2026-07-19 RYR1899 - Jul 19, 10:55 UTCJul 19, 11:30 UTC35m
2026-07-19 RYR49BH MAN → DUB Jul 19, 09:00 UTCJul 19, 09:35 UTC35m
2026-07-18 RYR46XX - Jul 18, 18:35 UTCJul 18, 20:25 UTC1h 50m
2026-07-18 RYR5HT MAN → BGY Jul 18, 15:45 UTCJul 18, 17:20 UTC1h 35m

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

Mode-S 4CA7B3 frequently asked

What is Mode-S code 4CA7B3?
4CA7B3 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-EFX.
Where is Mode-S 4CA7B3 registered?
Mode-S code 4CA7B3 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA7B3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA7B3, octal 23123663, decimal 5,023,667.
What flights does 4CA7B3 operate?
Mode-S 4CA7B3 has broadcast 20 distinct callsigns, including RYR615, RYR6002, RYR54JB, RYR19KU, RYR14RG.