Apparatus

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sensors Mode-S transponder

4CAFB3

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GSG · BOEING 737-800

Hex
4CAFB3
Octal
23127663
Decimal
5,025,715
Country
IE
Tail
EI-GSG
Type
B738
No current signal · last broadcast 3h ago
Flights observed
291
Distinct callsigns
20
Country
IE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4CAFB3.

Country allocation

The ICAO 24-bit address 4CAFB3 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
RYR9LD - 2 2026-04-15
RYR8ZE Ryanair 2 2026-05-22
RYR8XV Ryanair 2 2026-04-24
RYR8FD Ryanair 2 2026-04-16
RYR82SK Ryanair 2 2026-04-16
RYR80KA Ryanair 2 2026-04-15
RYR7CB Ryanair 2 2026-04-24
RYR76PX Ryanair 2 2026-04-25
RYR72ZY Ryanair 2 2026-05-16
RYR6QQ Ryanair 2 2026-05-08
RYR6HQ Ryanair 2 2026-04-17
RYR6BK Ryanair 2 2026-05-07
RYR67VZ - 2 2026-04-14
RYR65JW Ryanair 2 2026-05-13
RYR6412 Ryanair 2 2026-04-14
RYR6411 Ryanair 2 2026-04-14
RYR5WN - 2 2026-04-13
RYR5GT - 2 2026-04-13
RYR5DF Ryanair 2 2026-05-03
RYR59DF Ryanair 2 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 RYR25UT KUN → DUB May 29, 18:35 UTCMay 29, 21:10 UTC2h 35m
2026-05-29 RYR78GP FAO → BHX May 29, 15:00 UTCMay 29, 17:20 UTC2h 20m
2026-05-29 RYR76PN EDI → MLA May 29, 10:15 UTCMay 29, 12:45 UTC2h 30m
2026-05-29 RYR45YU FAO → STN May 29, 06:30 UTCMay 29, 08:55 UTC2h 25m
2026-05-28 RYR47AT BHX → FAO May 28, 17:40 UTCMay 28, 20:05 UTC2h 25m
2026-05-28 RYR76EX FAO → BHX May 28, 13:40 UTCMay 28, 16:10 UTC2h 30m
2026-05-28 RYR3VD EDI → BER May 28, 08:50 UTCMay 28, 11:30 UTC2h 40m
2026-05-28 RYR63PR CRL → BLQ May 28, 05:10 UTCMay 28, 08:00 UTC2h 50m
2026-05-27 RYR22FC DUB → CCF May 27, 18:45 UTCMay 27, 21:55 UTC3h 10m
2026-05-27 RYR776Q FAO → VIE May 27, 14:40 UTCMay 27, 17:45 UTC3h 5m
2026-05-27 RYR9CD DUB → PSA May 27, 10:30 UTCMay 27, 13:10 UTC2h 40m
2026-05-27 RYR952H FAO → NWI May 27, 07:05 UTCMay 27, 09:40 UTC2h 35m
2026-05-26 RYR3HC KRK → MAN May 26, 18:50 UTCMay 26, 21:20 UTC2h 30m
2026-05-26 RYR21FN FAO → CRL May 26, 15:39 UTCMay 26, 17:59 UTC2h 20m
2026-05-26 RYR22XZ EMA → FAO May 26, 11:09 UTCMay 26, 13:45 UTC2h 35m
2026-05-26 RYR98SM FAO → EMA May 26, 07:05 UTCMay 26, 09:35 UTC2h 30m
2026-05-25 RYR47NY BOH → FAO May 25, 19:25 UTCMay 25, 21:49 UTC2h 25m
2026-05-25 RYR80XD FAO → BOH May 25, 16:30 UTCMay 25, 18:40 UTC2h 10m
2026-05-25 RYR322N OPO → FAO May 25, 14:25 UTCMay 25, 15:15 UTC50m
2026-05-25 RYR17JX FAO → OPO May 25, 12:45 UTCMay 25, 13:35 UTC50m
2026-05-25 RYR45RG CGN → FAO May 25, 08:55 UTCMay 25, 11:40 UTC2h 45m
2026-05-25 RYR82ZB FAO → CGN May 25, 05:30 UTCMay 25, 08:10 UTC2h 40m
2026-05-24 RYR8274 FAO → OPO May 24, 20:35 UTCMay 24, 21:30 UTC55m
2026-05-24 RYR2XV NUE → FAO May 24, 16:40 UTCMay 24, 19:20 UTC2h 40m
2026-05-24 RYR9UM PSA → BDS May 24, 13:50 UTCMay 24, 15:30 UTC1h 40m
2026-05-24 RYR4479 NUE → VNO May 24, 11:25 UTCMay 24, 13:05 UTC1h 40m
2026-05-24 RYR62PM STN → NUE May 24, 09:00 UTCMay 24, 10:15 UTC1h 15m
2026-05-24 RYR5TN TIA → BGY May 24, 06:45 UTCMay 24, 08:05 UTC1h 20m
2026-05-23 RYR373 BIQ → STN May 23, 19:45 UTCMay 23, 20:40 UTC55m
2026-05-23 RYR46DW - May 23, 15:25 UTCMay 23, 16:50 UTC1h 25m
2026-05-23 RYR88YX - May 23, 13:10 UTCMay 23, 13:55 UTC45m
2026-05-23 RYR1398 PMI → ZAZ May 23, 11:35 UTCMay 23, 12:10 UTC35m
2026-05-23 RYR4PT SOF → EIN May 23, 07:55 UTCMay 23, 10:10 UTC2h 15m
2026-05-23 RYR7BV STN → GOT May 23, 04:30 UTCMay 23, 06:55 UTC2h 25m
2026-05-22 RYR7KJ STN → FNI May 22, 19:05 UTCMay 22, 21:00 UTC1h 55m
2026-05-22 RYR82YZ PMI → VIE May 22, 16:05 UTCMay 22, 18:15 UTC2h 10m
2026-05-22 RYR8ZE MAD → PMI May 22, 12:40 UTCMay 22, 13:30 UTC50m
2026-05-22 RYR4SV EDI → SDR May 22, 08:20 UTCMay 22, 10:30 UTC2h 10m
2026-05-22 RYR1JR GDN → STN May 22, 05:00 UTCMay 22, 07:20 UTC2h 20m
2026-05-21 RYR75VR LPA → MAD May 21, 19:50 UTCMay 21, 22:05 UTC2h 15m
2026-05-21 RYR3KM ALC → EIN May 21, 16:10 UTCMay 21, 18:15 UTC2h 5m
2026-05-21 RYR1XG CRL → WMI May 21, 13:15 UTCMay 21, 14:50 UTC1h 35m
2026-05-21 RYR56XL MAD → AHO May 21, 10:55 UTCMay 21, 12:25 UTC1h 30m
2026-05-21 RYR90SF DUB → MAD May 21, 07:30 UTCMay 21, 09:40 UTC2h 10m
2026-05-21 RYR165E MAD → DUB May 21, 04:00 UTCMay 21, 06:10 UTC2h 10m
2026-05-20 RYR3YM DUB → GDN May 20, 21:05 UTCMay 20, 22:00 UTC55m
2026-05-20 RYR8ZE MAD → PMI May 20, 19:05 UTCMay 20, 20:05 UTC1h 0m
2026-05-20 RYR36TZ CRL → MAD May 20, 15:40 UTCMay 20, 17:35 UTC1h 55m
2026-05-20 RYR375C AOI → CRL May 20, 13:05 UTCMay 20, 14:40 UTC1h 35m
2026-05-20 RYR87GN CRL → AOI May 20, 10:40 UTCMay 20, 12:00 UTC1h 20m

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

Mode-S 4CAFB3 frequently asked

What is Mode-S code 4CAFB3?
4CAFB3 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GSG.
Where is Mode-S 4CAFB3 registered?
Mode-S code 4CAFB3 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFB3 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFB3, octal 23127663, decimal 5,025,715.
What flights does 4CAFB3 operate?
Mode-S 4CAFB3 has broadcast 20 distinct callsigns, including RYR9LD, RYR8ZE, RYR8XV, RYR8FD, RYR82SK.