Apparatus

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sensors Mode-S transponder

4CA623

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-DWW · BOEING 737-800

Hex
4CA623
Octal
23123043
Decimal
5,023,267
Country
IE
Tail
EI-DWW
Type
B738
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
686
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 4CA623.

Country allocation

The ICAO 24-bit address 4CA623 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
RYR86LD Ryanair 6 2026-07-21
RYR688B Ryanair 6 2026-07-21
RYR58BW Ryanair 6 2026-07-23
RYR52MH Ryanair 6 2026-07-23
RYR5CD Ryanair 5 2026-05-18
RYR1U Ryanair 5 2026-05-18
RYR100T - 5 2026-05-21
RYR94MC Ryanair 4 2026-07-21
RYR720F Ryanair 4 2026-05-10
RYR6MB Ryanair 4 2026-05-13
RYR5LZ Ryanair 4 2026-05-15
RYR448 Ryanair 4 2026-05-14
RYR3SD - 4 2026-07-21
RYR32AE Ryanair 4 2026-05-14
RYR29WR Ryanair 4 2026-05-15
RYR26TR - 4 2026-07-05
RYR1AA Ryanair 4 2026-05-13
RYR95AT Ryanair 3 2026-07-25
RYR93GH Ryanair 3 2026-05-18
RYR92BL Ryanair 3 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR4074 AHO → BRI Jul 26, 22:15 UTCJul 26, 22:45 UTC30m
2026-07-26 RYR4073 BRI → AHO Jul 26, 20:15 UTCJul 26, 21:20 UTC1h 5m
2026-07-26 RYR83BZ CRL → BRI Jul 26, 17:35 UTCJul 26, 19:20 UTC1h 45m
2026-07-26 RYR6FC STN → BER Jul 26, 14:40 UTCJul 26, 16:40 UTC2h 0m
2026-07-26 RYR73ZU BVA → BRI Jul 26, 11:35 UTCJul 26, 13:25 UTC1h 50m
2026-07-26 RYR86QR BRI → BVA Jul 26, 08:35 UTCJul 26, 10:45 UTC2h 10m
2026-07-26 RYR442N BGY → BRI Jul 26, 06:05 UTCJul 26, 07:10 UTC1h 6m
2026-07-26 RYR372Y BRI → BGY Jul 26, 04:00 UTCJul 26, 05:15 UTC1h 15m
2026-07-25 RYR241F - Jul 25, 22:55 UTCJul 25, 23:40 UTC45m
2026-07-25 RYR408P - Jul 25, 20:40 UTCJul 25, 21:30 UTC50m
2026-07-25 RYR95AT DUB → LPA Jul 25, 19:00 UTCJul 25, 19:55 UTC55m
2026-07-25 RYR5ZL BRI → VCE Jul 25, 16:55 UTCJul 25, 17:50 UTC55m
2026-07-25 RYR2PK - Jul 25, 11:55 UTCJul 25, 13:15 UTC1h 20m
2026-07-25 RYR10ZJ BRI → NUE Jul 25, 09:30 UTCJul 25, 11:05 UTC1h 35m
2026-07-25 RYR9693 TIA → BRI Jul 25, 07:00 UTCJul 25, 07:25 UTC25m
2026-07-25 RYR5RT EIN → BCN Jul 25, 05:45 UTCJul 25, 06:00 UTC15m
2026-07-24 RYR3DE KUN → LTN Jul 24, 22:15 UTCJul 24, 23:10 UTC55m
2026-07-24 RYR28ZB BRI → VRN Jul 24, 20:20 UTCJul 24, 21:20 UTC1h 0m
2026-07-24 RYR9536 BBU → BRI Jul 24, 18:20 UTCJul 24, 19:30 UTC1h 10m
2026-07-24 RYR5KA - Jul 24, 16:10 UTCJul 24, 17:25 UTC1h 15m
2026-07-24 RYR91AC TPS → BRI Jul 24, 14:25 UTCJul 24, 15:15 UTC50m
2026-07-24 RYR5PR FCO → TPS Jul 24, 12:55 UTCJul 24, 13:35 UTC40m
2026-07-24 RYR6DY XCR → RAK Jul 24, 10:20 UTCJul 24, 11:15 UTC55m
2026-07-24 RYR7PJ KRK → SKG Jul 24, 07:20 UTCJul 24, 09:20 UTC2h 0m
2026-07-24 RYR25QH TPS → NRN Jul 24, 04:10 UTCJul 24, 06:35 UTC2h 25m
2026-07-23 RYR58BW BGY → TPS Jul 23, 20:10 UTCJul 23, 21:15 UTC1h 5m
2026-07-23 RYR52MH TPS → BGY Jul 23, 18:00 UTCJul 23, 19:20 UTC1h 20m
2026-07-23 RYR24RD BLQ → TPS Jul 23, 16:10 UTCJul 23, 17:15 UTC1h 5m
2026-07-23 RYR636E TPS → BLQ Jul 23, 14:05 UTCJul 23, 15:15 UTC1h 10m
2026-07-23 RYR9MW HHN → CFU Jul 23, 10:40 UTCJul 23, 11:55 UTC1h 15m
2026-07-23 RYR90EJ TPS → BGY Jul 23, 08:20 UTCJul 23, 09:40 UTC1h 20m
2026-07-23 RYR5PR FCO → TPS Jul 23, 06:50 UTCJul 23, 07:35 UTC45m
2026-07-23 RYR6DY XCR → RAK Jul 23, 04:45 UTCJul 23, 05:40 UTC55m
2026-07-22 RYR58BW BGY → TPS Jul 22, 22:00 UTCJul 22, 22:55 UTC55m
2026-07-22 RYR52MH TPS → BGY Jul 22, 18:50 UTCJul 22, 20:05 UTC1h 15m
2026-07-22 RYR23ML TRN → TPS Jul 22, 16:45 UTCJul 22, 17:40 UTC55m
2026-07-22 RYR82XC TPS → TRN Jul 22, 14:45 UTCJul 22, 15:55 UTC1h 10m
2026-07-22 RYR1YY - Jul 22, 11:10 UTCJul 22, 13:05 UTC1h 55m
2026-07-22 RYR43PX MAN → BGY Jul 22, 03:55 UTCJul 22, 05:15 UTC1h 20m
2026-07-21 RYR688B BLQ → TPS Jul 21, 20:00 UTCJul 21, 21:20 UTC1h 20m
2026-07-21 RYR86LD TPS → BLQ Jul 21, 18:00 UTCJul 21, 19:00 UTC1h 0m
2026-07-21 RYR3SD - Jul 21, 16:10 UTCJul 21, 16:55 UTC45m
2026-07-21 RYR94MC TPS → PSA Jul 21, 14:25 UTCJul 21, 15:15 UTC50m
2026-07-21 RYR66WD - Jul 21, 10:50 UTCJul 21, 12:30 UTC1h 40m
2026-07-21 RYR88WF - Jul 21, 08:30 UTCJul 21, 10:05 UTC1h 35m
2026-07-21 RYR58BW BGY → TPS Jul 21, 06:25 UTCJul 21, 07:25 UTC1h 0m
2026-07-21 RYR52MH TPS → BGY Jul 21, 04:00 UTCJul 21, 05:20 UTC1h 20m
2026-07-20 RYR4KF - Jul 20, 20:20 UTCJul 20, 21:20 UTC1h 0m
2026-07-20 RYR8XX DUB → STN Jul 20, 18:25 UTCJul 20, 19:30 UTC1h 5m
2026-07-20 RYR58BW BGY → TPS Jul 20, 16:20 UTCJul 20, 17:35 UTC1h 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-DWW page for operator, model, and routing details .

Mode-S 4CA623 frequently asked

What is Mode-S code 4CA623?
4CA623 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-DWW.
Where is Mode-S 4CA623 registered?
Mode-S code 4CA623 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA623 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA623, octal 23123043, decimal 5,023,267.
What flights does 4CA623 operate?
Mode-S 4CA623 has broadcast 20 distinct callsigns, including RYR86LD, RYR688B, RYR58BW, RYR52MH, RYR5CD.