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 RYR6NL · 23,725 ft
Flights observed
639
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 21:15 UTC

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
RYR76CW - 4 2026-07-06
RYR1RH - 4 2026-07-06
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
RYR8RB - 2 2026-07-06
RYR8LE Ryanair 2 2026-04-16
RYR89NK - 2 2026-07-15
RYR89HZ Ryanair 2 2026-05-17
RYR84LQ - 2 2026-06-29
RYR8137 Ryanair 2 2026-05-17
RYR80GB Ryanair 2 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR6YK LIS → BHX Jul 26, 19:00 UTCJul 26, 21:15 UTC2h 15m
2026-07-26 RYR36JX BHX → LIS Jul 26, 14:30 UTCJul 26, 16:35 UTC2h 5m
2026-07-26 RYR92CF FCO → BHX Jul 26, 09:40 UTCJul 26, 11:50 UTC2h 10m
2026-07-26 RYR2FU ARN → TLL Jul 26, 05:25 UTCJul 26, 07:25 UTC2h 1m
2026-07-25 RYR7TK GDN → BRS Jul 25, 18:10 UTCJul 25, 20:00 UTC1h 50m
2026-07-25 RYR17CG BHX → TSF Jul 25, 15:30 UTCJul 25, 17:15 UTC1h 45m
2026-07-25 RYR6PG AGP → RAK Jul 25, 11:05 UTCJul 25, 13:00 UTC1h 55m
2026-07-25 RYR38MR BHX → BCN Jul 25, 08:00 UTCJul 25, 09:55 UTC1h 55m
2026-07-24 RYR85KR - Jul 24, 21:50 UTCJul 25, 00:05 UTC2h 15m
2026-07-24 RYR6RN MAN → FAO Jul 24, 13:30 UTCJul 24, 13:55 UTC25m
2026-07-24 RYR4539 AGP → TTU Jul 24, 12:25 UTCJul 24, 12:45 UTC20m
2026-07-24 RYR5WL PSA → ARN Jul 24, 08:40 UTCJul 24, 11:20 UTC2h 40m
2026-07-24 RYR80DH AGP → EMA Jul 24, 05:15 UTCJul 24, 07:35 UTC2h 20m
2026-07-23 RYR225 KLU → ALC Jul 23, 19:40 UTCJul 23, 21:20 UTC1h 40m
2026-07-23 RYR224 BHX → ALC Jul 23, 17:30 UTCJul 23, 18:55 UTC1h 25m
2026-07-23 RYR305R MRS → AGP Jul 23, 13:50 UTCJul 23, 15:30 UTC1h 40m
2026-07-23 RYR34SQ - Jul 23, 11:30 UTCJul 23, 13:00 UTC1h 30m
2026-07-23 RYR22XB - Jul 23, 07:25 UTCJul 23, 10:00 UTC2h 35m
2026-07-23 RYR12ZM AGP → MAN Jul 23, 03:50 UTCJul 23, 06:25 UTC2h 35m
2026-07-22 RYR2NL GLA → WRO Jul 22, 21:55 UTCJul 22, 22:55 UTC1h 0m
2026-07-22 RYR2PR FAO → LUX Jul 22, 20:05 UTCJul 22, 20:45 UTC40m
2026-07-22 RYR9JW LPL → ALC Jul 22, 16:30 UTCJul 22, 19:00 UTC2h 30m
2026-07-22 RYR4KR AGP → EIN Jul 22, 13:05 UTCJul 22, 15:35 UTC2h 30m
2026-07-22 RYR4GZ STN → PSR Jul 22, 10:20 UTCJul 22, 11:40 UTC1h 20m
2026-07-21 RYR34FK AMS → AGP Jul 21, 19:40 UTCJul 21, 22:20 UTC2h 40m
2026-07-21 RYR847E AGP → AMS Jul 21, 16:05 UTCJul 21, 18:35 UTC2h 30m
2026-07-21 RYR3SE AGP → ACE Jul 21, 10:40 UTCJul 21, 15:05 UTC4h 25m
2026-07-21 RYR34SW - Jul 21, 07:10 UTCJul 21, 09:25 UTC2h 15m
2026-07-21 RYR8GM SNN → MRS Jul 21, 04:00 UTCJul 21, 05:55 UTC1h 55m
2026-07-20 RYR4SZ - Jul 20, 22:10 UTCJul 20, 22:55 UTC45m
2026-07-20 RYR4RL - Jul 20, 20:30 UTCJul 20, 21:25 UTC55m
2026-07-20 RYR7865 HHN → AGP Jul 20, 16:25 UTCJul 20, 19:10 UTC2h 45m
2026-07-20 RYR9WF STN → VLC Jul 20, 12:45 UTCJul 20, 15:05 UTC2h 20m
2026-07-20 RYR209L - Jul 20, 10:15 UTCJul 20, 11:15 UTC1h 0m
2026-07-20 RYR3909 - Jul 20, 07:45 UTCJul 20, 08:30 UTC45m
2026-07-20 RYR644 VLC → AGP Jul 20, 05:40 UTCJul 20, 06:30 UTC50m
2026-07-20 RYR7RA - Jul 20, 03:55 UTCJul 20, 04:40 UTC45m
2026-07-19 RYR1JN ALC → PIK Jul 19, 20:45 UTCJul 19, 22:10 UTC1h 25m
2026-07-19 RYR209J AGP → MAH Jul 19, 18:40 UTCJul 19, 19:50 UTC1h 10m
2026-07-19 RYR2AU SJJ → GOT Jul 19, 15:10 UTCJul 19, 17:35 UTC2h 25m
2026-07-19 RYR4NH - Jul 19, 12:00 UTCJul 19, 13:55 UTC1h 55m
2026-07-19 RYR49KF NRN → AGP Jul 19, 07:30 UTCJul 19, 10:10 UTC2h 40m
2026-07-19 RYR4TL BHX → PMI Jul 19, 04:20 UTCJul 19, 06:45 UTC2h 25m
2026-07-18 RYR6HV - Jul 18, 20:25 UTCJul 18, 23:00 UTC2h 35m
2026-07-18 RYR57MU CPH → STN Jul 18, 10:20 UTCJul 18, 11:45 UTC1h 25m
2026-07-18 RYR99WT STN → CPH Jul 18, 07:45 UTCJul 18, 09:05 UTC1h 20m
2026-07-17 RYR1FE OPO → NUE Jul 17, 19:30 UTCJul 17, 20:15 UTC45m
2026-07-17 RYR4XC BOD → SVQ Jul 17, 18:00 UTCJul 17, 18:44 UTC45m
2026-07-17 RYR6NG FCO → BRI Jul 17, 15:10 UTCJul 17, 17:09 UTC2h 0m
2026-07-17 RYR5NQ - Jul 17, 12:04 UTCJul 17, 14:15 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, RYR76CW, RYR1RH, RYR6VV, RYR64VL.