Apparatus

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sensors Mode-S transponder

4CA243

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-DCM · BOEING 737-800

Hex
4CA243
Octal
23121103
Decimal
5,022,275
Country
IE
Tail
EI-DCM
Type
B738
Broadcasting now · callsign RYR40SX · 38,000 ft
Flights observed
303
Distinct callsigns
20
Country
IE
Last broadcast
39m ago

Current position

4CA243 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CA243 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
RYR100T - 6 2026-05-28
RYR6VV Ryanair 3 2026-04-19
RYR64VL Ryanair 3 2026-04-19
RYR54MX - 3 2026-04-26
RYR5495 Ryanair 3 2026-04-26
RYR3029 Ryanair 3 2026-05-30
RYR3028 Ryanair 3 2026-05-30
RYR22PG - 3 2026-04-14
RYR9KG Ryanair 2 2026-05-15
RYR9EA Ryanair 2 2026-04-26
RYR994L Ryanair 2 2026-04-27
RYR8LE Ryanair 2 2026-04-16
RYR89HZ Ryanair 2 2026-05-17
RYR8137 Ryanair 2 2026-05-17
RYR80GB Ryanair 2 2026-05-03
RYR7PC Ryanair 2 2026-05-09
RYR7GR Ryanair 2 2026-05-09
RYR7EM Ryanair 2 2026-05-15
RYR7DM - 2 2026-04-14
RYR76VT Ryanair 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 RYR40SX MAN → OPO May 30, 07:50 UTCMay 30, 08:45 UTC55m
2026-05-30 RYR3029 IBZ → BCN May 30, 06:05 UTCMay 30, 06:40 UTC35m
2026-05-30 RYR3028 BCN → IBZ May 30, 03:55 UTCMay 30, 04:40 UTC45m
2026-05-29 RYR12EV OPO → BCN May 29, 22:40 UTCMay 30, 00:05 UTC1h 25m
2026-05-29 RYR4LJ BCN → OPO May 29, 20:35 UTCMay 29, 21:55 UTC1h 20m
2026-05-29 RYR2NW FEZ → CRL May 29, 18:05 UTCMay 29, 19:25 UTC1h 20m
2026-05-29 RYR57ZZ BCN → NDR May 29, 15:55 UTCMay 29, 17:15 UTC1h 20m
2026-05-29 RYR3184 RBA → BCN May 29, 12:00 UTCMay 29, 13:45 UTC1h 45m
2026-05-29 RYR3185 BCN → RBA May 29, 09:20 UTCMay 29, 10:45 UTC1h 25m
2026-05-29 RYR59RR BCN → DUB May 29, 06:35 UTCMay 29, 07:55 UTC1h 20m
2026-05-29 RYR93HA BCN → BGY May 29, 04:25 UTCMay 29, 05:40 UTC1h 15m
2026-05-28 RYR9392 EMA → BCN May 28, 20:45 UTCMay 28, 22:35 UTC1h 50m
2026-05-28 RYR103 EMA → EMA May 28, 12:45 UTCMay 28, 18:35 UTC5h 50m
2026-05-28 RYR100T - May 28, 09:40 UTCMay 28, 10:30 UTC50m
2026-05-28 RYR100T - May 28, 08:30 UTCMay 28, 09:25 UTC55m
2026-05-28 RYR100T EMA → EMA May 28, 07:20 UTCMay 28, 08:15 UTC55m
2026-05-27 RYR8115 VIE → OPO May 27, 23:25 UTCMay 28, 00:05 UTC40m
2026-05-27 RYR669 BHX → DUB May 27, 21:05 UTCMay 27, 21:55 UTC50m
2026-05-27 RYR68BJ DUB → BHX May 27, 19:45 UTCMay 27, 20:25 UTC40m
2026-05-27 RYR19WT BCN → DUB May 27, 16:50 UTCMay 27, 18:55 UTC2h 5m
2026-05-27 RYR4WK DUB → BCN May 27, 12:55 UTCMay 27, 15:05 UTC2h 10m
2026-05-27 RYR28UM ALC → DUB May 27, 09:05 UTCMay 27, 11:30 UTC2h 25m
2026-05-27 RYR1EB ORK → STN May 27, 05:35 UTCMay 27, 07:55 UTC2h 20m
2026-05-26 RYR93SC PEG → STN May 26, 20:20 UTCMay 26, 21:09 UTC50m
2026-05-26 RYR70SV DUB → LGW May 26, 17:59 UTCMay 26, 18:55 UTC55m
2026-05-26 RYR90GK POZ → DUB May 26, 14:30 UTCMay 26, 16:50 UTC2h 20m
2026-05-26 RYR65YP DUB → POZ May 26, 11:34 UTCMay 26, 13:34 UTC2h 0m
2026-05-26 RYR96SR KIR → DUB May 26, 09:40 UTCMay 26, 10:25 UTC45m
2026-05-26 RYR6NY FCO → DUB May 26, 08:24 UTCMay 26, 08:54 UTC30m
2026-05-25 RYR1C CIY → PSA May 25, 21:15 UTCMay 25, 21:45 UTC30m
2026-05-25 RYR82ZE DUB → CWL May 25, 19:59 UTCMay 25, 20:34 UTC35m
2026-05-25 RYR8NN MAN → PMI May 25, 16:50 UTCMay 25, 19:00 UTC2h 10m
2026-05-25 RYR6746 CRL → TLV May 25, 13:00 UTCMay 25, 15:25 UTC2h 25m
2026-05-25 RYR7FE BRU → DUB May 25, 07:50 UTCMay 25, 09:10 UTC1h 20m
2026-05-25 RYR61VB DUB → BRU May 25, 05:35 UTCMay 25, 06:50 UTC1h 15m
2026-05-24 RYR3125 IAS → BGY May 24, 23:00 UTCMay 24, 23:30 UTC30m
2026-05-24 RYR8ZP FCO → DUB May 24, 18:45 UTCMay 24, 21:10 UTC2h 25m
2026-05-24 RYR93SP DUB → FCO May 24, 14:45 UTCMay 24, 17:25 UTC2h 40m
2026-05-24 RYR2XA LBA → DUB May 24, 09:45 UTCMay 24, 12:10 UTC2h 25m
2026-05-24 RYR951 STN → SNN May 24, 08:20 UTCMay 24, 08:55 UTC35m
2026-05-24 RYR61ED LUX → BGY May 24, 06:05 UTCMay 24, 06:55 UTC50m
2026-05-24 RYR6QU MLA → MAD May 24, 04:15 UTCMay 24, 05:15 UTC1h 0m
2026-05-23 RYR1138 STN → STN May 23, 20:45 UTCMay 23, 21:45 UTC1h 0m
2026-05-23 RYR2MK CAG → VIE May 23, 18:05 UTCMay 23, 19:40 UTC1h 36m
2026-05-23 RYR346F VIE → CAG May 23, 15:25 UTCMay 23, 16:45 UTC1h 20m
2026-05-23 RYR582Z HEL → VIE May 23, 12:15 UTCMay 23, 14:05 UTC1h 50m
2026-05-23 RYR9857 VIE → HEL May 23, 08:50 UTCMay 23, 11:05 UTC2h 15m
2026-05-23 RYR4145 - May 23, 05:55 UTCMay 23, 07:40 UTC1h 45m
2026-05-22 RYR22FR OPO → STN May 22, 19:30 UTCMay 22, 21:25 UTC1h 55m
2026-05-22 RYR13SG STN → OPO May 22, 16:25 UTCMay 22, 18:35 UTC2h 10m

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

Mode-S 4CA243 frequently asked

What is Mode-S code 4CA243?
4CA243 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-DCM.
Where is Mode-S 4CA243 registered?
Mode-S code 4CA243 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA243 broadcasting right now?
Yes. Mode-S 4CA243 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA243, octal 23121103, decimal 5,022,275.
What flights does 4CA243 operate?
Mode-S 4CA243 has broadcast 20 distinct callsigns, including RYR100T, RYR6VV, RYR64VL, RYR54MX, RYR5495.