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 RYR69XF · 36,000 ft
Flights observed
558
Distinct callsigns
20
Country
IE
Last broadcast
7h ago

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 13 2026-05-27
RYR10UB Ryanair 12 2026-05-27
RYR998W Ryanair 3 2026-05-13
RYR75MA Ryanair 3 2026-05-13
RYR5CD - 3 2026-06-29
RYR5349 - 3 2026-04-13
RYR51MC Ryanair 3 2026-04-18
RYR4LJ Ryanair 3 2026-05-21
RYR42RQ - 3 2026-04-17
RYR37DV Ryanair 3 2026-05-19
RYR30JT - 3 2026-04-17
RYR2XR - 3 2026-04-17
RYR28VA Ryanair 3 2026-05-27
RYR27XU Ryanair 3 2026-05-19
RYR1U - 3 2026-06-29
RYR1709 Ryanair 3 2026-05-27
RYR12EV Ryanair 3 2026-05-21
RUK49DL - 3 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RYR23BF - Jul 14, 21:15 UTCJul 14, 22:00 UTC45m
2026-07-14 RYR812 - Jul 14, 19:50 UTCJul 14, 20:30 UTC40m
2026-07-14 RYR12KH - Jul 14, 16:45 UTCJul 14, 19:10 UTC2h 25m
2026-07-14 RYR3FF - Jul 14, 12:55 UTCJul 14, 15:35 UTC2h 40m
2026-07-14 RYR22UT LIS → DUB Jul 14, 09:30 UTCJul 14, 11:40 UTC2h 10m
2026-07-14 RYR7GJ DUB → LIS Jul 14, 05:35 UTCJul 14, 08:10 UTC2h 35m
2026-07-13 RYR1FT MAN → DUB Jul 13, 07:10 UTCJul 13, 07:50 UTC40m
2026-07-13 RYR146G DUB → MAN Jul 13, 05:25 UTCJul 13, 05:55 UTC30m
2026-07-12 RYR23BF - Jul 12, 22:45 UTCJul 12, 23:25 UTC40m
2026-07-12 RYR812 - Jul 12, 21:05 UTCJul 12, 21:45 UTC40m
2026-07-12 RYR7RB - Jul 12, 19:30 UTCJul 12, 20:01 UTC30m
2026-07-12 RYR7RB - Jul 12, 18:25 UTCJul 12, 19:25 UTC1h 0m
2026-07-12 RYR26VC - Jul 12, 15:35 UTCJul 12, 17:10 UTC1h 35m
2026-07-12 RYR3WP - Jul 12, 10:15 UTCJul 12, 14:05 UTC3h 50m
2026-07-12 RYR631K DUB → SKG Jul 12, 05:25 UTCJul 12, 08:45 UTC3h 20m
2026-07-11 RYR2UT CPH → DUB Jul 11, 22:05 UTCJul 12, 00:01 UTC1h 55m
2026-07-11 RYR6KC DUB → CPH Jul 11, 19:15 UTCJul 11, 20:55 UTC1h 40m
2026-07-11 RYR33ZB - Jul 11, 17:00 UTCJul 11, 18:15 UTC1h 15m
2026-07-11 RYR20AU - Jul 11, 14:50 UTCJul 11, 15:55 UTC1h 5m
2026-07-11 RYR2AJ - Jul 11, 12:00 UTCJul 11, 12:35 UTC35m
2026-07-11 RYR3RK BER → MAN Jul 11, 09:10 UTCJul 11, 10:55 UTC1h 45m
2026-07-11 RYR7QZ - Jul 11, 06:55 UTCJul 11, 08:15 UTC1h 20m
2026-07-11 RYR3YW BER → STN Jul 11, 04:30 UTCJul 11, 05:55 UTC1h 25m
2026-07-10 RYR28BE IBZ → BER Jul 10, 18:35 UTCJul 10, 21:05 UTC2h 30m
2026-07-10 RYR45CC BER → IBZ Jul 10, 14:20 UTCJul 10, 16:55 UTC2h 35m
2026-07-10 RYR12AV TRS → BER Jul 10, 11:20 UTCJul 10, 12:30 UTC1h 10m
2026-07-10 RYR7BW BER → TRS Jul 10, 09:30 UTCJul 10, 10:40 UTC1h 10m
2026-07-10 RYR75DX - Jul 10, 06:50 UTCJul 10, 08:30 UTC1h 40m
2026-07-10 RYR98AR - Jul 10, 04:00 UTCJul 10, 05:40 UTC1h 40m
2026-07-09 RYR8RZ - Jul 9, 18:20 UTCJul 9, 20:00 UTC1h 40m
2026-07-09 RYR95MP - Jul 9, 15:35 UTCJul 9, 17:35 UTC2h 0m
2026-07-09 RYR3U - Jul 9, 11:45 UTCJul 9, 14:45 UTC3h 0m
2026-07-09 RYR31KN - Jul 9, 07:55 UTCJul 9, 10:15 UTC2h 20m
2026-07-08 RYR44DW - Jul 8, 19:35 UTCJul 8, 20:50 UTC1h 15m
2026-07-08 RYR2789 BER → STN Jul 8, 17:15 UTCJul 8, 18:40 UTC1h 25m
2026-07-08 RYR95CH - Jul 8, 14:35 UTCJul 8, 16:25 UTC1h 50m
2026-07-08 RYR3EM - Jul 8, 11:50 UTCJul 8, 13:35 UTC1h 45m
2026-07-08 RYR91SP - Jul 8, 08:15 UTCJul 8, 10:55 UTC2h 40m
2026-07-08 RYR39DH BER → MAD Jul 8, 04:05 UTCJul 8, 06:40 UTC2h 35m
2026-07-07 RYR63WX - Jul 7, 17:55 UTCJul 7, 20:35 UTC2h 40m
2026-07-07 RYR93KF BER → VLC Jul 7, 14:30 UTCJul 7, 16:55 UTC2h 25m
2026-07-07 RYR8WT VCE → BER Jul 7, 12:15 UTCJul 7, 13:35 UTC1h 20m
2026-07-07 RYR3NJ - Jul 7, 10:00 UTCJul 7, 11:15 UTC1h 15m
2026-07-07 RYR749C - Jul 7, 07:25 UTCJul 7, 09:10 UTC1h 45m
2026-07-07 RYR8NZ BER → DUB Jul 7, 04:00 UTCJul 7, 06:10 UTC2h 10m
2026-07-06 RYR8YY - Jul 6, 19:30 UTCJul 6, 20:50 UTC1h 20m
2026-07-06 RYR77CN BER → STN Jul 6, 17:20 UTCJul 6, 18:40 UTC1h 20m
2026-07-06 RYR28LA - Jul 6, 14:35 UTCJul 6, 16:35 UTC2h 0m
2026-07-06 RYR76WJ - Jul 6, 11:20 UTCJul 6, 13:00 UTC1h 40m
2026-07-06 RYR1577 - Jul 6, 08:00 UTCJul 6, 10:15 UTC2h 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-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.