Apparatus

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sensors Mode-S transponder

4CA76A

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-EFO · BOEING 737-800

Hex
4CA76A
Octal
23123552
Decimal
5,023,594
Country
IE
Tail
EI-EFO
Type
B738
No current signal · last broadcast 19d ago
Flights observed
193
Distinct callsigns
20
Country
IE
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S 4CA76A.

Country allocation

The ICAO 24-bit address 4CA76A 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
RYR9NC - 3 2026-04-21
RYR93GH - 3 2026-04-13
RYR877F Ryanair 3 2026-05-04
RYR6PA Ryanair 3 2026-04-19
RYR5CD Ryanair 3 2026-04-14
RYR4633 Ryanair 3 2026-04-21
RYR31KK Ryanair 3 2026-05-04
RYR1U Ryanair 3 2026-04-14
RYR1NN Ryanair 3 2026-04-19
RUK9SR - 3 2026-04-15
RYR9QX Ryanair 2 2026-04-19
RYR92JA Ryanair 2 2026-05-02
RYR92HW - 2 2026-04-16
RYR8VD Ryanair 2 2026-05-06
RYR82BG - 2 2026-04-13
RYR78YR Ryanair 2 2026-05-04
RYR765L Ryanair 2 2026-04-29
RYR73QL Ryanair 2 2026-04-15
RYR6QU Ryanair 2 2026-04-27
RYR61ED Ryanair 2 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-10 RYR9126 MAN → FUE May 10, 22:25 UTCMay 10, 22:40 UTC15m
2026-05-10 RYR4ZG CRL → CDT May 10, 18:45 UTCMay 10, 20:54 UTC2h 10m
2026-05-10 RYR71KY EDI → WRO May 10, 15:55 UTCMay 10, 17:45 UTC1h 50m
2026-05-10 RYR7FJ SJJ → CRL May 10, 12:10 UTCMay 10, 14:59 UTC2h 50m
2026-05-10 RYR62EG EDI → AGP May 10, 07:45 UTCMay 10, 10:55 UTC3h 10m
2026-05-09 RYR47MZ BVA → EDI May 9, 21:25 UTCMay 9, 22:39 UTC1h 15m
2026-05-09 RYR33TU FEZ → BVA May 9, 12:50 UTCMay 9, 15:00 UTC2h 10m
2026-05-09 RYR21YW BVA → FEZ May 9, 09:00 UTCMay 9, 11:30 UTC2h 30m
2026-05-09 RYR4UAF DUB → BVA May 9, 06:05 UTCMay 9, 07:10 UTC1h 5m
2026-05-09 RYR55KV BVA → DUB May 9, 04:00 UTCMay 9, 05:05 UTC1h 5m
2026-05-08 RYR72ZY EMA → ALC May 8, 17:20 UTCMay 8, 19:15 UTC1h 55m
2026-05-08 RYR17FY BVA → LIS May 8, 14:05 UTCMay 8, 16:20 UTC2h 15m
2026-05-08 RYR3643 BVA → ESU May 8, 06:04 UTCMay 8, 12:55 UTC6h 50m
2026-05-07 RYR6VV PRG → RHO May 7, 19:05 UTCMay 7, 21:10 UTC2h 5m
2026-05-07 RYR64VL MLA → EDI May 7, 15:40 UTCMay 7, 18:00 UTC2h 20m
2026-05-07 RYR88DL PSA → BVA May 7, 13:25 UTCMay 7, 14:45 UTC1h 20m
2026-05-07 RYR6BT NWI → MLA May 7, 11:00 UTCMay 7, 12:15 UTC1h 15m
2026-05-07 RYR136H OPO → BVA May 7, 07:30 UTCMay 7, 09:10 UTC1h 41m
2026-05-06 RYR7D MXP → OPO May 6, 18:05 UTCMay 6, 20:15 UTC2h 10m
2026-05-06 RYR8VD STN → KUN May 6, 13:40 UTCMay 6, 15:20 UTC1h 40m
2026-05-06 RYR227P FMM → DUB May 6, 11:10 UTCMay 6, 12:40 UTC1h 30m
2026-05-06 RYR2DJ NCL → FUE May 6, 08:10 UTCMay 6, 10:20 UTC2h 10m
2026-05-06 RYR7306 MXP → WMI May 6, 06:00 UTCMay 6, 07:35 UTC1h 35m
2026-05-05 RYR5U - May 5, 18:30 UTCMay 5, 19:40 UTC1h 10m
2026-05-05 RYR801W MXP → NAP May 5, 16:06 UTCMay 5, 16:55 UTC50m
2026-05-05 RYR8VD STN → KUN May 5, 13:05 UTCMay 5, 14:35 UTC1h 30m
2026-05-05 RYR227P FMM → DUB May 5, 10:20 UTCMay 5, 11:50 UTC1h 30m
2026-05-05 RYR5TA AGP → LPL May 5, 07:45 UTCMay 5, 09:15 UTC1h 30m
2026-05-05 RYR9HT MXP → VLC May 5, 05:20 UTCMay 5, 07:00 UTC1h 40m
2026-05-04 RYR6K TFS → AGP May 4, 12:55 UTCMay 4, 14:15 UTC1h 20m
2026-05-04 RYR877F GOA → PMO May 4, 09:55 UTCMay 4, 10:50 UTC55m
2026-05-04 RYR31KK CRL → TNG May 4, 07:45 UTCMay 4, 08:55 UTC1h 10m
2026-05-04 RYR78YR FCO → PMO May 4, 06:00 UTCMay 4, 06:35 UTC35m
2026-05-04 RYR29SA PMO → FCO May 4, 04:05 UTCMay 4, 04:44 UTC40m
2026-05-03 RYR3FZ MAD → STN May 3, 20:15 UTCMay 3, 21:20 UTC1h 5m
2026-05-03 RYR55PN PMO → PMF May 3, 18:25 UTCMay 3, 19:34 UTC1h 10m
2026-05-03 RYR877F GOA → PMO May 3, 15:40 UTCMay 3, 16:45 UTC1h 5m
2026-05-03 RYR31KK CRL → TNG May 3, 13:45 UTCMay 3, 14:55 UTC1h 10m
2026-05-03 RYR78YR FCO → PMO May 3, 12:05 UTCMay 3, 12:40 UTC35m
2026-05-03 RYR29SA PMO → FCO May 3, 10:05 UTCMay 3, 10:45 UTC40m
2026-05-03 RYR80FQ HHN → PMO May 3, 07:00 UTCMay 3, 08:45 UTC1h 45m
2026-05-03 RYR2HW TRN → ACE May 3, 04:00 UTCMay 3, 05:55 UTC1h 55m
2026-05-02 RYR89PT FCO → PMO May 2, 21:10 UTCMay 2, 21:40 UTC30m
2026-05-02 RYR21GU PMO → FCO May 2, 19:40 UTCMay 2, 20:20 UTC40m
2026-05-02 RYR7868 OTP → PMO May 2, 17:05 UTCMay 2, 18:35 UTC1h 30m
2026-05-02 RYR550E PMO → OTP May 2, 14:25 UTCMay 2, 16:20 UTC1h 55m
2026-05-02 RYR605H BGY → PMO May 2, 11:35 UTCMay 2, 12:35 UTC1h 0m
2026-05-02 RYR27QC ARN → BVA May 2, 09:25 UTCMay 2, 10:45 UTC1h 20m
2026-05-02 RYR92JA VRN → PMO May 2, 07:25 UTCMay 2, 08:25 UTC1h 0m
2026-05-02 RYR15XJ PMO → VRN May 2, 05:15 UTCMay 2, 06:30 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-EFO page for operator, model, and routing details .

Mode-S 4CA76A frequently asked

What is Mode-S code 4CA76A?
4CA76A is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-EFO.
Where is Mode-S 4CA76A registered?
Mode-S code 4CA76A is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA76A broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA76A, octal 23123552, decimal 5,023,594.
What flights does 4CA76A operate?
Mode-S 4CA76A has broadcast 20 distinct callsigns, including RYR9NC, RYR93GH, RYR877F, RYR6PA, RYR5CD.