Apparatus

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sensors Mode-S transponder

4CAFB4

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GSH · BOEING 737-800

Hex
4CAFB4
Octal
23127664
Decimal
5,025,716
Country
IE
Tail
EI-GSH
Type
B738
Broadcasting now · callsign RYR31TU · 36,000 ft
Flights observed
629
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 22:10 UTC

Current position

4CAFB4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAFB4 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
RYR6049 Ryanair 17 2026-05-20
RYR12LF Ryanair 15 2026-05-20
RYR9UA Ryanair 14 2026-07-21
RYR10UB Ryanair 13 2026-07-21
RYR998W Ryanair 3 2026-05-13
RYR75MA Ryanair 3 2026-05-13
RYR720F - 3 2026-07-18
RYR5CD - 3 2026-06-29
RYR5482 Ryanair 3 2026-07-23
RYR5349 - 3 2026-04-13
RYR51MC Ryanair 3 2026-04-18
RYR4LJ Ryanair 3 2026-05-21
RYR44JG Ryanair 3 2026-07-24
RYR42RQ - 3 2026-04-17
RYR39TP Ryanair 3 2026-07-24
RYR39RJ Ryanair 3 2026-07-23
RYR37DV Ryanair 3 2026-05-19
RYR30JT - 3 2026-04-17
RYR2XR - 3 2026-04-17
RYR2KD Ryanair 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR19GL STN → VCE Jul 26, 20:45 UTCJul 26, 22:10 UTC1h 25m
2026-07-26 RYR2GH SUF → NUE Jul 26, 18:30 UTCJul 26, 19:55 UTC1h 25m
2026-07-26 RYR2787 - Jul 26, 16:25 UTCJul 26, 17:40 UTC1h 15m
2026-07-26 RYR6NG FCO → BRI Jul 26, 12:40 UTCJul 26, 15:10 UTC2h 30m
2026-07-26 RYR5NQ AGP → GLA Jul 26, 09:00 UTCJul 26, 11:05 UTC2h 5m
2026-07-25 RYR13CQ VIE → STN Jul 25, 18:55 UTCJul 25, 20:45 UTC1h 50m
2026-07-25 RYR8WA - Jul 25, 16:25 UTCJul 25, 18:00 UTC1h 35m
2026-07-25 RYR8BT BRS → WMI Jul 25, 12:55 UTCJul 25, 14:55 UTC2h 0m
2026-07-25 RYR5SR EDI → IBZ Jul 25, 09:40 UTCJul 25, 11:35 UTC1h 55m
2026-07-25 RYR49EY OPO → STN Jul 25, 06:10 UTCJul 25, 08:10 UTC2h 0m
2026-07-24 RYR38MP CRL → OPO Jul 24, 20:00 UTCJul 24, 22:05 UTC2h 5m
2026-07-24 RYR1RN OPO → CRL Jul 24, 17:10 UTCJul 24, 19:05 UTC1h 55m
2026-07-24 RYR39TP MAN → OPO Jul 24, 14:10 UTCJul 24, 16:10 UTC2h 0m
2026-07-24 RYR3CE NAP → TLS Jul 24, 10:50 UTCJul 24, 12:55 UTC2h 5m
2026-07-24 RYR2KD CTA → MRS Jul 24, 07:30 UTCJul 24, 08:35 UTC1h 5m
2026-07-24 RYR44JG OPO → SVQ Jul 24, 05:25 UTCJul 24, 06:15 UTC50m
2026-07-23 RYR5482 MAD → OPO Jul 23, 22:55 UTCJul 23, 23:45 UTC50m
2026-07-23 RYR39RJ OPO → MAD Jul 23, 20:45 UTCJul 23, 21:35 UTC50m
2026-07-23 RYR7D MXP → OPO Jul 23, 17:45 UTCJul 23, 19:55 UTC2h 10m
2026-07-23 RYR1RL BOH → FAO Jul 23, 14:40 UTCJul 23, 16:30 UTC1h 50m
2026-07-23 RYR33BN - Jul 23, 10:35 UTCJul 23, 13:40 UTC3h 5m
2026-07-23 RYR110P OPO → BRI Jul 23, 06:40 UTCJul 23, 09:15 UTC2h 35m
2026-07-22 RYR879T LUX → OPO Jul 22, 20:15 UTCJul 22, 22:25 UTC2h 10m
2026-07-22 RYR1RC OPO → LUX Jul 22, 17:30 UTCJul 22, 19:25 UTC1h 55m
2026-07-22 RYR5482 MAD → OPO Jul 22, 15:55 UTCJul 22, 16:40 UTC45m
2026-07-22 RYR39RJ OPO → MAD Jul 22, 13:55 UTCJul 22, 14:40 UTC45m
2026-07-22 RYR37VB EIN → OPO Jul 22, 11:10 UTCJul 22, 13:05 UTC1h 55m
2026-07-21 RYR37VB EIN → OPO Jul 21, 17:55 UTCJul 21, 20:10 UTC2h 15m
2026-07-21 RYR75TJ OPO → EIN Jul 21, 14:45 UTCJul 21, 16:55 UTC2h 10m
2026-07-21 RYR7716 MRS → OPO Jul 21, 12:25 UTCJul 21, 13:45 UTC1h 20m
2026-07-21 RYR7715 - Jul 21, 10:20 UTCJul 21, 11:40 UTC1h 20m
2026-07-21 RYR10UB FNC → OPO Jul 21, 07:35 UTCJul 21, 09:10 UTC1h 35m
2026-07-21 RYR9UA AGP → PAD Jul 21, 05:00 UTCJul 21, 06:50 UTC1h 50m
2026-07-20 RYR9497 - Jul 20, 22:35 UTCJul 20, 23:25 UTC50m
2026-07-20 RYR75XQ OPO → FAO Jul 20, 21:05 UTCJul 20, 21:55 UTC50m
2026-07-20 RYR39TP MAN → OPO Jul 20, 18:30 UTCJul 20, 20:20 UTC1h 50m
2026-07-20 RYR506G VIE → MAN Jul 20, 14:15 UTCJul 20, 16:20 UTC2h 5m
2026-07-20 RYR20FV MAN → VIE Jul 20, 11:15 UTCJul 20, 13:15 UTC2h 0m
2026-07-20 RYR4KN - Jul 20, 09:45 UTCJul 20, 10:25 UTC40m
2026-07-20 RYR77GB MAN → DUB Jul 20, 08:20 UTCJul 20, 09:00 UTC40m
2026-07-19 RYR7EE LIS → EIN Jul 19, 21:10 UTCJul 20, 01:15 UTC4h 5m
2026-07-19 RYR22LN MAN → RHO Jul 19, 16:25 UTCJul 19, 20:10 UTC3h 45m
2026-07-19 RYR21WJ - Jul 19, 14:25 UTCJul 19, 15:05 UTC40m
2026-07-19 RYR165E - Jul 19, 11:00 UTCJul 19, 13:05 UTC2h 5m
2026-07-19 RYR90SF - Jul 19, 07:20 UTCJul 19, 09:20 UTC2h 0m
2026-07-18 RYR41RE BSL → ZAG Jul 18, 18:35 UTCJul 18, 22:10 UTC3h 35m
2026-07-18 RYR1UD DUB → TFS Jul 18, 13:25 UTCJul 18, 17:10 UTC3h 45m
2026-07-18 RYR2AJ MAN → DUB Jul 18, 10:55 UTCJul 18, 11:35 UTC40m
2026-07-18 RYR554 DUB → MAN Jul 18, 09:35 UTCJul 18, 10:05 UTC30m
2026-07-18 RYR720F - Jul 18, 08:15 UTCJul 18, 08:45 UTC30m

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

Mode-S 4CAFB4 frequently asked

What is Mode-S code 4CAFB4?
4CAFB4 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GSH.
Where is Mode-S 4CAFB4 registered?
Mode-S code 4CAFB4 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFB4 broadcasting right now?
Yes. Mode-S 4CAFB4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFB4, octal 23127664, decimal 5,025,716.
What flights does 4CAFB4 operate?
Mode-S 4CAFB4 has broadcast 20 distinct callsigns, including RYR6049, RYR12LF, RYR9UA, RYR10UB, RYR998W.