Apparatus

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sensors Mode-S transponder

4CA764

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-EFI · BOEING 737-800

Hex
4CA764
Octal
23123544
Decimal
5,023,588
Country
IE
Tail
EI-EFI
Type
B738
Broadcasting now · callsign RYR7PR · 32,000 ft
Flights observed
324
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Current position

4CA764 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CA764 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
RYR334K Ryanair 6 2026-04-19
RYR908 Ryanair 5 2026-04-19
RYR93BN Ryanair 3 2026-04-15
RYR919G - 3 2026-04-15
RYR7UH Ryanair 3 2026-05-27
RYR76VT Ryanair 3 2026-05-29
RYR70ST Ryanair 3 2026-05-27
RYR44MH Ryanair 3 2026-05-29
RYR3175 Ryanair 3 2026-05-25
RYR3174 Ryanair 3 2026-05-25
RYR9MP Ryanair 2 2026-05-06
RYR94VL Ryanair 2 2026-05-26
RYR8VP Ryanair 2 2026-04-16
RYR8TP Ryanair 2 2026-05-24
RYR8CD Ryanair 2 2026-05-14
RYR89HZ Ryanair 2 2026-05-25
RYR81PY Ryanair 2 2026-05-30
RYR7WV Ryanair 2 2026-05-10
RYR78HC Ryanair 2 2026-05-26
RYR78EA - 2 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 RYR70ZV BCN → SCQ May 30, 17:30 UTCMay 30, 18:50 UTC1h 20m
2026-05-30 RYR60VY BTS → BCN May 30, 14:15 UTCMay 30, 16:15 UTC2h 0m
2026-05-30 RYR31NN BCN → BTS May 30, 11:20 UTCMay 30, 13:25 UTC2h 5m
2026-05-30 RYR53YW WMI → LIS May 30, 08:10 UTCMay 30, 09:40 UTC1h 30m
2026-05-30 RYR81PY BCN → BVA May 30, 05:10 UTCMay 30, 06:35 UTC1h 25m
2026-05-29 RYR3071 PMI → BCN May 29, 21:20 UTCMay 29, 22:00 UTC40m
2026-05-29 RYR6Z PFO → SOF May 29, 20:00 UTCMay 29, 20:25 UTC25m
2026-05-29 RYR76VT DUB → BCN May 29, 16:45 UTCMay 29, 18:50 UTC2h 5m
2026-05-29 RYR44MH BCN → DUB May 29, 13:35 UTCMay 29, 15:50 UTC2h 16m
2026-05-29 RYR84AV CRL → BCN May 29, 10:15 UTCMay 29, 11:45 UTC1h 30m
2026-05-29 RYR5UM ALC → HEL May 29, 07:55 UTCMay 29, 09:30 UTC1h 35m
2026-05-29 RYR1343 PMI → BCN May 29, 05:55 UTCMay 29, 06:40 UTC45m
2026-05-29 RYR4PG ZAZ → STN May 29, 04:25 UTCMay 29, 04:55 UTC30m
2026-05-28 RYR50ZJ FCO → BCN May 28, 21:30 UTCMay 28, 22:45 UTC1h 15m
2026-05-28 RYR62NA BCN → FCO May 28, 18:45 UTCMay 28, 20:05 UTC1h 20m
2026-05-28 RYR4WF BCN → EMA May 28, 15:50 UTCMay 28, 17:45 UTC1h 55m
2026-05-28 RYR5VN BRU → DUB May 28, 12:35 UTCMay 28, 14:45 UTC2h 10m
2026-05-28 RYR8AA PMI → LBA May 28, 07:25 UTCMay 28, 09:55 UTC2h 30m
2026-05-28 RYR7W CPH → KUN May 28, 04:05 UTCMay 28, 06:25 UTC2h 20m
2026-05-27 RYR7UH WMI → BRI May 27, 21:20 UTCMay 27, 22:40 UTC1h 20m
2026-05-27 RYR70ST BCN → PMO May 27, 19:00 UTCMay 27, 20:25 UTC1h 25m
2026-05-27 RYR53YW WMI → LIS May 27, 16:40 UTCMay 27, 18:00 UTC1h 20m
2026-05-27 RYR81PY BCN → BVA May 27, 14:25 UTCMay 27, 15:50 UTC1h 25m
2026-05-27 RYR200F VNO → BCN May 27, 09:40 UTCMay 27, 13:00 UTC3h 20m
2026-05-27 RYR478T BCN → VNO May 27, 05:55 UTCMay 27, 08:55 UTC3h 1m
2026-05-26 RYR2897 PMI → BCN May 26, 22:29 UTCMay 26, 22:59 UTC30m
2026-05-26 RYR632Q BCN → PMI May 26, 20:45 UTCMay 26, 21:09 UTC25m
2026-05-26 RYR33DQ STN → BCN May 26, 17:59 UTCMay 26, 19:45 UTC1h 45m
2026-05-26 RYR11PM BCN → STN May 26, 15:24 UTCMay 26, 17:09 UTC1h 45m
2026-05-26 RYR94VL TRS → BCN May 26, 12:05 UTCMay 26, 13:29 UTC1h 25m
2026-05-26 RYR78HC BCN → TRS May 26, 09:45 UTCMay 26, 11:15 UTC1h 30m
2026-05-26 RYR28UR OPO → BCN May 26, 07:05 UTCMay 26, 08:34 UTC1h 30m
2026-05-26 RYR1CV DUB → KIR May 26, 04:24 UTCMay 26, 06:04 UTC1h 40m
2026-05-25 RYR8137 IBZ → BCN May 25, 22:00 UTCMay 25, 22:30 UTC30m
2026-05-25 RYR89HZ BCN → IBZ May 25, 20:30 UTCMay 25, 21:09 UTC40m
2026-05-25 RYR3175 IBZ → BCN May 25, 18:10 UTCMay 25, 18:50 UTC40m
2026-05-25 RYR3174 BCN → IBZ May 25, 16:40 UTCMay 25, 17:20 UTC40m
2026-05-25 RYR66EF KRK → BCN May 25, 13:05 UTCMay 25, 15:25 UTC2h 20m
2026-05-25 RYR8BY DUB → LGW May 25, 09:50 UTCMay 25, 12:15 UTC2h 25m
2026-05-25 RYR7UH WMI → BRI May 25, 06:25 UTCMay 25, 08:00 UTC1h 35m
2026-05-25 RYR70ST BCN → PMO May 25, 04:05 UTCMay 25, 05:20 UTC1h 15m
2026-05-24 RYR89HZ BCN → IBZ May 24, 20:30 UTCMay 24, 21:10 UTC40m
2026-05-24 RYR2897 PMI → BCN May 24, 18:55 UTCMay 24, 19:25 UTC30m
2026-05-24 RYR632Q BCN → PMI May 24, 17:20 UTCMay 24, 17:45 UTC25m
2026-05-24 RYR88TM FCO → BCN May 24, 14:25 UTCMay 24, 15:40 UTC1h 15m
2026-05-24 RYR94ZG BCN → FCO May 24, 11:25 UTCMay 24, 12:45 UTC1h 20m
2026-05-24 RYR8TP MXP → STN May 24, 07:45 UTCMay 24, 09:10 UTC1h 25m
2026-05-24 RYR35PE BCN → VCE May 24, 04:50 UTCMay 24, 06:15 UTC1h 25m
2026-05-23 RYR119T PED → ALC May 23, 20:50 UTCMay 23, 22:05 UTC1h 15m
2026-05-23 RYR55BJ GDN → ARN May 23, 18:45 UTCMay 23, 20:00 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-EFI page for operator, model, and routing details .

Mode-S 4CA764 frequently asked

What is Mode-S code 4CA764?
4CA764 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-EFI.
Where is Mode-S 4CA764 registered?
Mode-S code 4CA764 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA764 broadcasting right now?
Yes. Mode-S 4CA764 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA764, octal 23123544, decimal 5,023,588.
What flights does 4CA764 operate?
Mode-S 4CA764 has broadcast 20 distinct callsigns, including RYR334K, RYR908, RYR93BN, RYR919G, RYR7UH.