Apparatus

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sensors Mode-S transponder

4CACDF

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GJS · BOEING 737-800

Hex
4CACDF
Octal
23126337
Decimal
5,024,991
Country
IE
Tail
EI-GJS
Type
B738
No current signal · last broadcast 4h ago
Flights observed
350
Distinct callsigns
20
Country
IE
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 4CACDF.

Country allocation

The ICAO 24-bit address 4CACDF 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
RYR86XQ Ryanair 5 2026-04-18
RYR5QY Ryanair 4 2026-05-21
RYR4RA Ryanair 4 2026-05-21
RYR2T - 4 2026-04-14
RYR87AY Ryanair 3 2026-05-21
RYR81PR Ryanair 3 2026-04-18
RYR734J - 3 2026-04-13
RYR6GH Ryanair 3 2026-05-21
RYR6DD Ryanair 3 2026-04-13
RYR100T - 3 2026-04-14
RYR9XH Ryanair 2 2026-05-05
RYR9JP Ryanair 2 2026-05-22
RYR9CU Ryanair 2 2026-05-30
RYR9BV Ryanair 2 2026-05-26
RYR99NC Ryanair 2 2026-05-21
RYR90RC Ryanair 2 2026-05-10
RYR8LX Ryanair 2 2026-04-17
RYR8GU Ryanair 2 2026-04-15
RYR89PT Ryanair 2 2026-05-26
RYR89EQ Ryanair 2 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 RYR3CF PMO → VIE May 30, 22:50 UTCMay 30, 23:20 UTC30m
2026-05-30 RYR3788 PMO → AHO May 30, 21:30 UTCMay 30, 22:10 UTC40m
2026-05-30 RYR55NA TRN → PMO May 30, 19:05 UTCMay 30, 20:10 UTC1h 5m
2026-05-30 RYR4916 PMO → TRN May 30, 17:05 UTCMay 30, 18:20 UTC1h 15m
2026-05-30 RYR2DV OTP → PSR May 30, 15:05 UTCMay 30, 16:05 UTC1h 0m
2026-05-30 RYR6VE BGY → BVA May 30, 13:30 UTCMay 30, 14:30 UTC1h 0m
2026-05-30 RYR9CU MRS → PFO May 30, 10:30 UTCMay 30, 12:25 UTC1h 55m
2026-05-30 RYR57AX - May 30, 07:10 UTCMay 30, 09:10 UTC2h 0m
2026-05-29 RYR1TD SUF → FKB May 29, 21:10 UTCMay 29, 22:05 UTC55m
2026-05-29 RYR79KT GDN → ZAD May 29, 19:25 UTCMay 29, 20:25 UTC1h 0m
2026-05-29 RYR81UZ TRN → PMO May 29, 17:20 UTCMay 29, 18:25 UTC1h 5m
2026-05-29 RYR64QD TSF → TFS May 29, 15:20 UTCMay 29, 16:40 UTC1h 20m
2026-05-29 RYR1PJ MLA → ATH May 29, 13:20 UTCMay 29, 13:50 UTC30m
2026-05-29 RYR34MP PMO → FCO May 29, 11:15 UTCMay 29, 12:05 UTC50m
2026-05-29 RYR4057 AGP → HAM May 29, 08:00 UTCMay 29, 10:00 UTC2h 0m
2026-05-29 RYR47TK PMO → WMI May 29, 05:00 UTCMay 29, 07:20 UTC2h 20m
2026-05-28 RYR33RN STN → PMO May 28, 20:15 UTCMay 28, 22:35 UTC2h 20m
2026-05-28 RYR6CB SNN → LPA May 28, 16:55 UTCMay 28, 19:25 UTC2h 30m
2026-05-28 RYR1PJ MLA → ATH May 28, 15:00 UTCMay 28, 15:40 UTC40m
2026-05-28 RYR34MP PMO → FCO May 28, 13:10 UTCMay 28, 13:55 UTC45m
2026-05-28 RYR650D FMM → PMO May 28, 10:20 UTCMay 28, 11:50 UTC1h 30m
2026-05-28 RYR62GK PMO → FMM May 28, 08:00 UTCMay 28, 09:30 UTC1h 30m
2026-05-28 RYR738U NAP → PMO May 28, 06:25 UTCMay 28, 06:55 UTC30m
2026-05-28 RYR6FR ALC → BRS May 28, 04:55 UTCMay 28, 05:25 UTC30m
2026-05-27 RYR3FZ MAD → STN May 27, 20:50 UTCMay 27, 21:50 UTC1h 0m
2026-05-27 RYR55PN PMO → PMF May 27, 19:00 UTCMay 27, 20:00 UTC1h 0m
2026-05-27 RYR2DV OTP → PSR May 27, 16:10 UTCMay 27, 17:05 UTC55m
2026-05-27 RYR6VE BGY → BVA May 27, 14:25 UTCMay 27, 15:30 UTC1h 5m
2026-05-27 RYR9CU MRS → PFO May 27, 11:35 UTCMay 27, 13:30 UTC1h 55m
2026-05-27 RYR57AX - May 27, 08:35 UTCMay 27, 10:40 UTC2h 5m
2026-05-27 RYR605H BGY → PMO May 27, 06:25 UTCMay 27, 07:35 UTC1h 10m
2026-05-27 RYR27QC ARN → BVA May 27, 04:14 UTCMay 27, 05:24 UTC1h 10m
2026-05-26 RYR89PT FCO → PMO May 26, 21:00 UTCMay 26, 21:40 UTC40m
2026-05-26 RYR21GU PMO → FCO May 26, 19:05 UTCMay 26, 19:45 UTC40m
2026-05-26 RYR650D FMM → PMO May 26, 16:40 UTCMay 26, 18:05 UTC1h 25m
2026-05-26 RYR62GK PMO → FMM May 26, 14:20 UTCMay 26, 15:54 UTC1h 35m
2026-05-26 RYR4373 POZ → PMO May 26, 10:50 UTCMay 26, 12:50 UTC2h 0m
2026-05-26 RYR2CM WMI → EIN May 26, 07:59 UTCMay 26, 10:10 UTC2h 10m
2026-05-26 RYR73GR BLQ → PMO May 26, 06:04 UTCMay 26, 07:10 UTC1h 5m
2026-05-26 RYR9BV MAN → TFS May 26, 04:15 UTCMay 26, 05:15 UTC1h 0m
2026-05-25 RYR8FP PMO → VRN May 25, 21:24 UTCMay 25, 22:34 UTC1h 10m
2026-05-25 RYR142H PMO → VRN May 25, 19:25 UTCMay 25, 20:30 UTC1h 5m
2026-05-25 RYR89PT FCO → PMO May 25, 18:00 UTCMay 25, 18:30 UTC30m
2026-05-25 RYR21GU PMO → FCO May 25, 16:10 UTCMay 25, 16:55 UTC45m
2026-05-25 RYR3ZE GDN → PRG May 25, 12:40 UTCMay 25, 15:00 UTC2h 20m
2026-05-25 RYR70GE PMO → STN May 25, 09:00 UTCMay 25, 11:25 UTC2h 25m
2026-05-25 RYR7ME STN → PMI May 25, 06:50 UTCMay 25, 07:35 UTC45m
2026-05-25 RYR8TH STN → CTA May 25, 05:00 UTCMay 25, 05:55 UTC55m
2026-05-24 RYR3FZ MAD → STN May 24, 20:00 UTCMay 24, 20:55 UTC55m
2026-05-24 RYR55PN PMO → PMF May 24, 18:10 UTCMay 24, 19:15 UTC1h 5m

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

Mode-S 4CACDF frequently asked

What is Mode-S code 4CACDF?
4CACDF is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GJS.
Where is Mode-S 4CACDF registered?
Mode-S code 4CACDF is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CACDF broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CACDF, octal 23126337, decimal 5,024,991.
What flights does 4CACDF operate?
Mode-S 4CACDF has broadcast 20 distinct callsigns, including RYR86XQ, RYR5QY, RYR4RA, RYR2T, RYR87AY.