Apparatus

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sensors Mode-S transponder

4CAFC0

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GSK · BOEING 737-800

Hex
4CAFC0
Octal
23127700
Decimal
5,025,728
Country
IE
Tail
EI-GSK
Type
B738
Broadcasting now · callsign RYR771U · 17,750 ft
Flights observed
624
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 22:00 UTC

Current position

4CAFC0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAFC0 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
RYR088 Ryanair 11 2026-07-25
RYR5EJ - 8 2026-04-17
RYR80XD - 6 2026-07-03
RYR6HL Ryanair 6 2026-06-01
RYR60PR Ryanair 6 2026-06-01
RYR59CA Ryanair 6 2026-04-17
RYR47NY - 6 2026-07-03
RYR3WD Ryanair 6 2026-07-25
RYR385 Ryanair 6 2026-07-26
RYR384 Ryanair 5 2026-07-26
RYR31FW Ryanair 5 2026-07-03
RYR21PC - 5 2026-07-03
RYR9RA Ryanair 4 2026-06-02
RYR8DY Ryanair 4 2026-05-20
RYR693D Ryanair 4 2026-07-26
RYR54LC Ryanair 4 2026-05-20
RYR39ED Ryanair 4 2026-06-02
RYR32KG Ryanair 4 2026-07-26
RYR322N - 4 2026-07-03
RYR17JX - 4 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR32KG TLS → LIS Jul 26, 21:05 UTCJul 26, 22:00 UTC55m
2026-07-26 RYR693D LIS → TLS Jul 26, 18:25 UTCJul 26, 19:55 UTC1h 30m
2026-07-26 RYR384 FNC → LIS Jul 26, 15:20 UTCJul 26, 16:40 UTC1h 20m
2026-07-26 RYR385 LIS → FNC Jul 26, 14:15 UTCJul 26, 14:30 UTC15m
2026-07-26 RYR385 LIS → FNC Jul 26, 13:00 UTCJul 26, 13:40 UTC40m
2026-07-26 RYR7GJ DBV → DUB Jul 26, 08:30 UTCJul 26, 10:40 UTC2h 10m
2026-07-26 RYR22UT LIS → DUB Jul 26, 05:05 UTCJul 26, 07:25 UTC2h 21m
2026-07-25 RYR384 FNC → LIS Jul 25, 21:10 UTCJul 25, 22:25 UTC1h 15m
2026-07-25 RYR385 LIS → FNC Jul 25, 18:20 UTCJul 25, 19:45 UTC1h 25m
2026-07-25 RYR55AR - Jul 25, 14:15 UTCJul 25, 16:20 UTC2h 5m
2026-07-25 RYR72ZY EMA → ALC Jul 25, 11:25 UTCJul 25, 13:25 UTC2h 0m
2026-07-25 RYR3WD EDI → GDN Jul 25, 09:00 UTCJul 25, 10:25 UTC1h 25m
2026-07-25 RYR088 EMA → CFU Jul 25, 08:00 UTCJul 25, 08:15 UTC15m
2026-07-25 RYR088 EMA → CFU Jul 25, 06:40 UTCJul 25, 07:25 UTC45m
2026-07-24 RYR3WD EDI → GDN Jul 24, 19:25 UTCJul 24, 20:50 UTC1h 25m
2026-07-24 RYR088 EMA → CFU Jul 24, 18:20 UTCJul 24, 18:35 UTC15m
2026-07-24 RYR088 EMA → CFU Jul 24, 17:05 UTCJul 24, 17:50 UTC45m
2026-07-24 RYR5KT - Jul 24, 13:55 UTCJul 24, 16:00 UTC2h 5m
2026-07-24 RYR1LX - Jul 24, 11:10 UTCJul 24, 12:55 UTC1h 45m
2026-07-24 RYR20EE - Jul 24, 08:35 UTCJul 24, 10:05 UTC1h 30m
2026-07-24 RYR2BX JTR → MXP Jul 24, 05:55 UTCJul 24, 07:00 UTC1h 5m
2026-07-23 RYR3RB BLQ → BRI Jul 23, 19:25 UTCJul 23, 22:00 UTC2h 35m
2026-07-23 RYR22RD LIS → CRL Jul 23, 16:20 UTCJul 23, 18:35 UTC2h 15m
2026-07-23 RYR55AR - Jul 23, 13:10 UTCJul 23, 15:15 UTC2h 5m
2026-07-23 RYR72ZY - Jul 23, 10:15 UTCJul 23, 12:10 UTC1h 55m
2026-07-23 RYR3WD EDI → GDN Jul 23, 08:10 UTCJul 23, 09:20 UTC1h 10m
2026-07-23 RYR088 EMA → CFU Jul 23, 07:00 UTCJul 23, 07:15 UTC15m
2026-07-23 RYR088 EMA → CFU Jul 23, 05:40 UTCJul 23, 06:15 UTC35m
2026-07-22 RYR2JL CGN → ALC Jul 22, 16:45 UTCJul 22, 21:00 UTC4h 15m
2026-07-22 RYR617R LIS → WMI Jul 22, 12:30 UTCJul 22, 15:55 UTC3h 25m
2026-07-22 RYR4CB - Jul 22, 05:05 UTCJul 22, 10:25 UTC5h 20m
2026-07-21 RYR16GW - Jul 21, 19:45 UTCJul 21, 22:15 UTC2h 30m
2026-07-21 RYR13QK LIS → LUX Jul 21, 16:20 UTCJul 21, 18:30 UTC2h 10m
2026-07-21 RYR9PX SVQ → LIS Jul 21, 14:45 UTCJul 21, 15:30 UTC45m
2026-07-21 RYR3628 LIS → SVQ Jul 21, 13:15 UTCJul 21, 13:55 UTC40m
2026-07-21 RYR12VQ - Jul 21, 09:05 UTCJul 21, 11:20 UTC2h 15m
2026-07-21 RYR7389 LIS → DUB Jul 21, 05:40 UTCJul 21, 07:55 UTC2h 15m
2026-07-20 RYR56BR - Jul 20, 16:30 UTCJul 20, 19:30 UTC3h 0m
2026-07-20 RYR51DR BRI → ZAD Jul 20, 13:25 UTCJul 20, 15:35 UTC2h 10m
2026-07-20 RYR7GJ - Jul 20, 09:40 UTCJul 20, 12:05 UTC2h 25m
2026-07-20 RYR22UT LIS → DUB Jul 20, 06:10 UTCJul 20, 08:30 UTC2h 20m
2026-07-19 RYR32KG TLS → LIS Jul 19, 20:50 UTCJul 19, 22:40 UTC1h 50m
2026-07-19 RYR693D LIS → TLS Jul 19, 18:40 UTCJul 19, 20:00 UTC1h 20m
2026-07-19 RYR384 FNC → LIS Jul 19, 15:10 UTCJul 19, 16:25 UTC1h 15m
2026-07-19 RYR385 LIS → FNC Jul 19, 12:50 UTCJul 19, 14:20 UTC1h 30m
2026-07-19 RYR7GJ - Jul 19, 08:10 UTCJul 19, 10:30 UTC2h 20m
2026-07-19 RYR22UT LIS → DUB Jul 19, 05:00 UTCJul 19, 07:15 UTC2h 15m
2026-07-18 RYR384 FNC → LIS Jul 18, 21:00 UTCJul 18, 22:20 UTC1h 20m
2026-07-18 RYR385 LIS → FNC Jul 18, 18:00 UTCJul 18, 19:25 UTC1h 25m
2026-07-18 RYR55AR - Jul 18, 14:20 UTCJul 18, 16:35 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-GSK page for operator, model, and routing details .

Mode-S 4CAFC0 frequently asked

What is Mode-S code 4CAFC0?
4CAFC0 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GSK.
Where is Mode-S 4CAFC0 registered?
Mode-S code 4CAFC0 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFC0 broadcasting right now?
Yes. Mode-S 4CAFC0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFC0, octal 23127700, decimal 5,025,728.
What flights does 4CAFC0 operate?
Mode-S 4CAFC0 has broadcast 20 distinct callsigns, including RYR088, RYR5EJ, RYR80XD, RYR6HL, RYR60PR.