Apparatus

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sensors Mode-S transponder

4CAFB5

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GSI · BOEING 737-800

Hex
4CAFB5
Octal
23127665
Decimal
5,025,717
Country
IE
Tail
EI-GSI
Type
B738
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
649
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 4CAFB5.

Country allocation

The ICAO 24-bit address 4CAFB5 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
RYR10UB Ryanair 13 2026-06-13
RYR9UA - 12 2026-06-13
RYR9ED Ryanair 9 2026-05-10
RYR6049 Ryanair 9 2026-06-09
RYR5PU Ryanair 9 2026-05-10
RYR12LF Ryanair 9 2026-06-09
RYR9PY - 6 2026-07-15
RYR67RA - 6 2026-07-15
RYR37DV Ryanair 6 2026-06-09
RYR27XU Ryanair 6 2026-06-09
RYR89SN Ryanair 5 2026-07-17
RYR82NW Ryanair 5 2026-05-11
RYR771X Ryanair 5 2026-07-17
RYR63RY - 5 2026-07-17
RYR53SE Ryanair 5 2026-05-04
RYR2GJ Ryanair 5 2026-05-11
RYR22JQ - 5 2026-07-18
RYR89VJ Ryanair 4 2026-05-11
RYR84QL Ryanair 4 2026-05-10
RYR7FU - 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR16AJ ALC → CPH Jul 26, 19:10 UTCJul 26, 21:15 UTC2h 5m
2026-07-26 RYR20YU AGP → BHX Jul 26, 15:45 UTCJul 26, 18:20 UTC2h 35m
2026-07-26 RYR5LF BUD → BGY Jul 26, 13:15 UTCJul 26, 14:20 UTC1h 5m
2026-07-26 RYR43NU AGP → BCN Jul 26, 10:50 UTCJul 26, 12:10 UTC1h 20m
2026-07-26 RYR3SE AGP → ACE Jul 26, 05:00 UTCJul 26, 09:35 UTC4h 36m
2026-07-25 RYR2MM PFO → STN Jul 25, 22:05 UTCJul 26, 01:20 UTC3h 15m
2026-07-25 RYR7CH BHX → TLS Jul 25, 18:05 UTCJul 25, 20:50 UTC2h 45m
2026-07-25 RYR3CC POZ → DUB Jul 25, 11:30 UTCJul 25, 14:50 UTC3h 20m
2026-07-25 RYR5CY - Jul 25, 07:35 UTCJul 25, 10:20 UTC2h 45m
2026-07-25 RYR9586 TNG → AGP Jul 25, 06:05 UTCJul 25, 06:30 UTC25m
2026-07-25 RYR9587 CLJ → DUB Jul 25, 04:45 UTCJul 25, 05:10 UTC25m
2026-07-24 RYR59VA WRO → EMA Jul 24, 23:00 UTCJul 24, 23:20 UTC20m
2026-07-24 RYR6UP AGP → STN Jul 24, 21:40 UTCJul 24, 22:10 UTC30m
2026-07-24 RYR2SV - Jul 24, 17:45 UTCJul 24, 20:30 UTC2h 45m
2026-07-24 RYR4RE - Jul 24, 14:35 UTCJul 24, 16:55 UTC2h 20m
2026-07-24 RYR4FU DUB → LGW Jul 24, 10:10 UTCJul 24, 13:25 UTC3h 15m
2026-07-24 RYR6637 VNO → BER Jul 24, 05:25 UTCJul 24, 08:55 UTC3h 30m
2026-07-23 RYR8FN BGY → SVQ Jul 23, 22:10 UTCJul 23, 23:05 UTC55m
2026-07-23 RYR1ZP IBZ → BCN Jul 23, 20:25 UTCJul 23, 21:05 UTC40m
2026-07-23 RYR827R BOD → STN Jul 23, 16:50 UTCJul 23, 19:10 UTC2h 20m
2026-07-23 RYR7QD FCO → DUB Jul 23, 13:35 UTCJul 23, 15:35 UTC2h 0m
2026-07-23 RYR73AH GLA → AGP Jul 23, 09:20 UTCJul 23, 12:10 UTC2h 50m
2026-07-23 RYR8AB NCL → BCN Jul 23, 05:15 UTCJul 23, 08:10 UTC2h 55m
2026-07-22 RYR8DZ PIK → LPA Jul 22, 18:20 UTCJul 22, 20:45 UTC2h 25m
2026-07-22 RYR34KB AGP → MAN Jul 22, 14:50 UTCJul 22, 17:25 UTC2h 35m
2026-07-22 RYR2YA - Jul 22, 11:30 UTCJul 22, 13:50 UTC2h 20m
2026-07-21 RYR33JA - Jul 21, 18:35 UTCJul 21, 21:30 UTC2h 55m
2026-07-21 RYR49WZ - Jul 21, 15:10 UTCJul 21, 17:45 UTC2h 35m
2026-07-21 RYR86NE BCN → STN Jul 21, 12:15 UTCJul 21, 14:10 UTC1h 55m
2026-07-21 RYR72AV WMI → BCN Jul 21, 07:25 UTCJul 21, 10:15 UTC2h 50m
2026-07-21 RYR45AH BCN → WMI Jul 21, 04:05 UTCJul 21, 06:25 UTC2h 20m
2026-07-20 RYR2RM DUB → PLQ Jul 20, 21:45 UTCJul 20, 23:25 UTC1h 40m
2026-07-20 RYR643L BCN → STN Jul 20, 19:00 UTCJul 20, 20:55 UTC1h 55m
2026-07-20 RYR9LH STN → BCN Jul 20, 14:35 UTCJul 20, 16:25 UTC1h 50m
2026-07-20 RYR55CW BCN → STN Jul 20, 11:40 UTCJul 20, 13:30 UTC1h 50m
2026-07-20 RYR53YW WMI → LIS Jul 20, 09:00 UTCJul 20, 10:25 UTC1h 25m
2026-07-20 RYR81PY BCN → BVA Jul 20, 06:45 UTCJul 20, 08:10 UTC1h 25m
2026-07-19 RYR95FC LIS → BCN Jul 19, 21:50 UTCJul 19, 23:10 UTC1h 20m
2026-07-19 RYR647X BCN → LIS Jul 19, 18:35 UTCJul 19, 20:15 UTC1h 40m
2026-07-19 RYR7718 PMO → BCN Jul 19, 15:45 UTCJul 19, 17:20 UTC1h 35m
2026-07-19 RYR1MA - Jul 19, 13:25 UTCJul 19, 14:45 UTC1h 20m
2026-07-19 RYR46PL - Jul 19, 10:15 UTCJul 19, 12:00 UTC1h 45m
2026-07-19 RYR45RE NAP → CAG Jul 19, 08:00 UTCJul 19, 09:05 UTC1h 5m
2026-07-19 RYR24UD STN → NOC Jul 19, 06:10 UTCJul 19, 07:15 UTC1h 5m
2026-07-18 RYR1FE OPO → NUE Jul 18, 19:30 UTCJul 18, 20:20 UTC50m
2026-07-18 RYR4XC BOD → SVQ Jul 18, 18:10 UTCJul 18, 18:50 UTC40m
2026-07-18 RYR911R - Jul 18, 15:40 UTCJul 18, 17:15 UTC1h 35m
2026-07-18 RYR6KP - Jul 18, 13:40 UTCJul 18, 14:55 UTC1h 15m
2026-07-18 RYR22JQ - Jul 18, 11:45 UTCJul 18, 12:45 UTC1h 0m
2026-07-18 RYR74VJ - Jul 18, 08:50 UTCJul 18, 11:00 UTC2h 10m

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

Mode-S 4CAFB5 frequently asked

What is Mode-S code 4CAFB5?
4CAFB5 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GSI.
Where is Mode-S 4CAFB5 registered?
Mode-S code 4CAFB5 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFB5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFB5, octal 23127665, decimal 5,025,717.
What flights does 4CAFB5 operate?
Mode-S 4CAFB5 has broadcast 20 distinct callsigns, including RYR10UB, RYR9UA, RYR9ED, RYR6049, RYR5PU.