Apparatus

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sensors Mode-S transponder

4CAFC4

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GXI · BOEING 737-800

Hex
4CAFC4
Octal
23127704
Decimal
5,025,732
Country
IE
Tail
EI-GXI
Type
B738
Broadcasting now · callsign RYR9159 · 29,275 ft
Flights observed
651
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 23:00 UTC

Current position

4CAFC4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAFC4 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
RYR1FF Ryanair 7 2026-05-05
RYR71LM Ryanair 6 2026-05-05
RYR63WX Ryanair 4 2026-05-02
RYR5275 Ryanair 4 2026-05-04
RYR51XX - 4 2026-05-04
RYR45HE Ryanair 4 2026-05-04
RYR276D Ryanair 4 2026-05-04
RYR9YF Ryanair 3 2026-06-01
RYR8UF - 3 2026-06-17
RYR7372 Ryanair 3 2026-05-03
RYR69BQ Ryanair 3 2026-04-22
RYR615 Ryanair 3 2026-05-06
RYR2SF Ryanair 3 2026-04-22
RYR24ST Ryanair 3 2026-05-03
RYR19KU Ryanair 3 2026-05-06
RYR9UA Ryanair 2 2026-05-14
RYR9JX Ryanair 2 2026-04-16
RYR9979 - 2 2026-06-28
RYR98QX - 2 2026-07-18
RYR982M Ryanair 2 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR48YA STN → MAD Jul 26, 21:20 UTCJul 26, 23:00 UTC1h 40m
2026-07-26 RYR393A PGF → STN Jul 26, 17:20 UTCJul 26, 19:05 UTC1h 45m
2026-07-26 RYR58JL STN → PGF Jul 26, 14:45 UTCJul 26, 16:15 UTC1h 30m
2026-07-26 RYR86NE AHO → CRL Jul 26, 11:50 UTCJul 26, 13:50 UTC2h 0m
2026-07-26 RYR46PL STN → BCN Jul 26, 08:25 UTCJul 26, 10:00 UTC1h 35m
2026-07-25 RYR9LD DUB → BRU Jul 25, 18:20 UTCJul 25, 21:15 UTC2h 55m
2026-07-25 RYR4HH - Jul 25, 14:55 UTCJul 25, 17:30 UTC2h 35m
2026-07-25 RYR7CQ BUD → CTA Jul 25, 12:05 UTCJul 25, 13:35 UTC1h 30m
2026-07-25 RYR11GQ STN → PRG Jul 25, 09:55 UTCJul 25, 11:25 UTC1h 30m
2026-07-25 RYR46WQ BGY → STN Jul 25, 07:25 UTCJul 25, 08:55 UTC1h 30m
2026-07-25 RYR90WG STN → BGY Jul 25, 05:05 UTCJul 25, 06:30 UTC1h 25m
2026-07-24 RYR33WW EFL → STN Jul 24, 18:00 UTCJul 24, 21:00 UTC3h 0m
2026-07-24 RYR4YE - Jul 24, 14:30 UTCJul 24, 17:10 UTC2h 40m
2026-07-24 RYR5KP ACE → MAD Jul 24, 10:55 UTCJul 24, 12:30 UTC1h 35m
2026-07-24 RYR14XK DUB → GRO Jul 24, 07:35 UTCJul 24, 09:35 UTC2h 0m
2026-07-24 RYR14GR GRO → DUB Jul 24, 04:25 UTCJul 24, 06:20 UTC1h 55m
2026-07-23 RYR57CE LBA → GRO Jul 23, 20:45 UTCJul 23, 22:35 UTC1h 50m
2026-07-23 RYR551A GRO → LBA Jul 23, 18:05 UTCJul 23, 20:00 UTC1h 55m
2026-07-23 RYR67ZN AGA → DUB Jul 23, 16:10 UTCJul 23, 17:20 UTC1h 10m
2026-07-23 RYR4FT - Jul 23, 13:50 UTCJul 23, 15:20 UTC1h 30m
2026-07-23 RYR23AL AGP → PMI Jul 23, 11:10 UTCJul 23, 12:40 UTC1h 30m
2026-07-23 RYR8FV ARN → BNX Jul 23, 08:30 UTCJul 23, 10:15 UTC1h 45m
2026-07-23 RYR93QL CRL → GRO Jul 23, 06:10 UTCJul 23, 07:40 UTC1h 30m
2026-07-23 RYR48XY GRO → CRL Jul 23, 03:55 UTCJul 23, 05:30 UTC1h 35m
2026-07-22 RYR48RH ZAG → GRO Jul 22, 19:45 UTCJul 22, 21:25 UTC1h 40m
2026-07-22 RYR2279 GRO → ZAG Jul 22, 17:25 UTCJul 22, 18:50 UTC1h 25m
2026-07-22 RYR68NZ - Jul 22, 15:05 UTCJul 22, 16:35 UTC1h 30m
2026-07-22 RYR221L GRO → NRN Jul 22, 11:40 UTCJul 22, 13:30 UTC1h 50m
2026-07-22 RYR4MP DUB → LGW Jul 22, 04:00 UTCJul 22, 05:25 UTC1h 25m
2026-07-21 RYR2449 PED → GRO Jul 21, 18:30 UTCJul 21, 20:20 UTC1h 50m
2026-07-21 RYR9KC STN → WMI Jul 21, 16:00 UTCJul 21, 17:50 UTC1h 50m
2026-07-21 RYR79QE STN → GRO Jul 21, 12:50 UTCJul 21, 14:25 UTC1h 35m
2026-07-21 RYR5KP ACE → MAD Jul 21, 10:10 UTCJul 21, 12:00 UTC1h 50m
2026-07-21 RYR93QL - Jul 21, 06:40 UTCJul 21, 08:00 UTC1h 20m
2026-07-21 RYR48XY - Jul 21, 04:10 UTCJul 21, 05:45 UTC1h 35m
2026-07-20 RYR1154 - Jul 20, 22:05 UTCJul 20, 23:25 UTC1h 20m
2026-07-20 RYR28XE - Jul 20, 14:35 UTCJul 20, 17:30 UTC2h 55m
2026-07-20 RYR28PF - Jul 20, 11:45 UTCJul 20, 14:00 UTC2h 15m
2026-07-20 RYR83FG DUB → SVQ Jul 20, 08:10 UTCJul 20, 10:35 UTC2h 25m
2026-07-20 RYR891M SVQ → DUB Jul 20, 04:40 UTCJul 20, 07:15 UTC2h 35m
2026-07-19 RYR2207 VLC → SVQ Jul 19, 21:50 UTCJul 19, 22:45 UTC55m
2026-07-19 RYR95QJ SVQ → VLC Jul 19, 20:05 UTCJul 19, 20:55 UTC50m
2026-07-19 RYR97BW MRS → SVQ Jul 19, 17:25 UTCJul 19, 19:10 UTC1h 45m
2026-07-19 RYR14CN - Jul 19, 15:35 UTCJul 19, 16:20 UTC45m
2026-07-19 RYR59PP LPA → MAN Jul 19, 13:40 UTCJul 19, 14:30 UTC50m
2026-07-19 RYR79YV DBV → MRS Jul 19, 10:35 UTCJul 19, 12:15 UTC1h 40m
2026-07-19 RYR20YG - Jul 19, 08:25 UTCJul 19, 09:45 UTC1h 20m
2026-07-19 RYR69BK - Jul 19, 06:35 UTCJul 19, 07:30 UTC55m
2026-07-19 RYR33PZ - Jul 19, 04:45 UTCJul 19, 05:50 UTC1h 5m
2026-07-18 RYR1LX LIS → MRS Jul 18, 16:50 UTCJul 18, 18:30 UTC1h 40m

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

Mode-S 4CAFC4 frequently asked

What is Mode-S code 4CAFC4?
4CAFC4 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GXI.
Where is Mode-S 4CAFC4 registered?
Mode-S code 4CAFC4 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFC4 broadcasting right now?
Yes. Mode-S 4CAFC4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFC4, octal 23127704, decimal 5,025,732.
What flights does 4CAFC4 operate?
Mode-S 4CAFC4 has broadcast 20 distinct callsigns, including RYR1FF, RYR71LM, RYR63WX, RYR5275, RYR51XX.