Apparatus

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sensors Mode-S transponder

4CA61C

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-DWO · BOEING 737-800

Hex
4CA61C
Octal
23123034
Decimal
5,023,260
Country
IE
Tail
EI-DWO
Type
B738
Broadcasting now · callsign RYR2MM · 35,000 ft
Flights observed
201
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Current position

4CA61C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CA61C 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
RYR5TY Ryanair 3 2026-04-26
RYR27ST Ryanair 3 2026-05-07
RYR99ZG - 2 2026-04-14
RYR89XQ Ryanair 2 2026-04-15
RYR80JJ - 2 2026-04-14
RYR7LU Ryanair 2 2026-05-12
RYR768F Ryanair 2 2026-04-16
RYR72NK Ryanair 2 2026-05-24
RYR65CV Ryanair 2 2026-05-25
RYR63UE Ryanair 2 2026-05-10
RYR5448 Ryanair 2 2026-04-16
RYR4ZF - 2 2026-04-14
RYR4GC - 2 2026-04-13
RYR499W - 2 2026-04-15
RYR47UF Ryanair 2 2026-05-25
RYR45WG Ryanair 2 2026-05-16
RYR42DN - 2 2026-04-16
RYR40MM - 2 2026-04-13
RYR3TN - 2 2026-04-13
RYR2TT Ryanair 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 RYR7CH BHX → TLS May 30, 15:45 UTCMay 30, 18:50 UTC3h 5m
2026-05-29 RYR8YT EDI → FUE May 29, 18:05 UTCMay 29, 19:05 UTC1h 0m
2026-05-29 RYR2DG MAD → VIE May 29, 14:45 UTCMay 29, 17:05 UTC2h 20m
2026-05-29 RYR88PX PMI → CRL May 29, 11:50 UTCMay 29, 13:40 UTC1h 50m
2026-05-29 RYR8XC LUX → STN May 29, 08:50 UTCMay 29, 10:30 UTC1h 40m
2026-05-29 RYR9SU MAH → MAD May 29, 06:45 UTCMay 29, 08:05 UTC1h 20m
2026-05-29 RYR9N DRS → STN May 29, 04:50 UTCMay 29, 06:05 UTC1h 15m
2026-05-28 RYR1CU BGY → RJK May 28, 17:35 UTCMay 28, 20:10 UTC2h 35m
2026-05-28 RYR13UV BHX → BCN May 28, 14:20 UTCMay 28, 16:30 UTC2h 10m
2026-05-28 RYR760R BZR → CRL May 28, 11:35 UTCMay 28, 12:55 UTC1h 20m
2026-05-28 RYR86DZ CRL → BZR May 28, 09:25 UTCMay 28, 10:40 UTC1h 15m
2026-05-28 RYR838P PSA → CRL May 28, 07:15 UTCMay 28, 08:40 UTC1h 25m
2026-05-28 RYR98XK CRL → PSA May 28, 05:00 UTCMay 28, 06:15 UTC1h 15m
2026-05-27 RYR2AK BVA → NAP May 27, 14:45 UTCMay 27, 17:15 UTC2h 30m
2026-05-27 RYR4EY CRL → OUD May 27, 11:05 UTCMay 27, 13:45 UTC2h 40m
2026-05-27 RYR27MD FSC → CRL May 27, 07:55 UTCMay 27, 09:40 UTC1h 45m
2026-05-27 RYR7FM STN → MXP May 27, 05:14 UTCMay 27, 06:44 UTC1h 30m
2026-05-26 RYR26LU TLS → CRL May 26, 19:45 UTCMay 26, 21:00 UTC1h 15m
2026-05-26 RYR34HL CRL → TLS May 26, 17:39 UTCMay 26, 18:55 UTC1h 15m
2026-05-26 RYR34XP BCN → CRL May 26, 15:20 UTCMay 26, 16:55 UTC1h 35m
2026-05-26 RYR96RZ OPO → BCN May 26, 12:30 UTCMay 26, 13:50 UTC1h 20m
2026-05-26 RYR30UJ BCN → OPO May 26, 09:59 UTCMay 26, 11:20 UTC1h 20m
2026-05-26 RYR8TP MXP → STN May 26, 06:54 UTCMay 26, 08:15 UTC1h 20m
2026-05-26 RYR35PE BCN → VCE May 26, 04:30 UTCMay 26, 05:54 UTC1h 25m
2026-05-25 RYR6JW BUD → STN May 25, 21:24 UTCMay 25, 22:44 UTC1h 20m
2026-05-25 RYR274F BCN → FEZ May 25, 19:00 UTCMay 25, 20:30 UTC1h 29m
2026-05-25 RYR65CV BHX → BCN May 25, 15:55 UTCMay 25, 17:50 UTC1h 55m
2026-05-25 RYR47UF BCN → BHX May 25, 13:00 UTCMay 25, 14:55 UTC1h 55m
2026-05-25 RYR84AV CRL → BCN May 25, 10:05 UTCMay 25, 11:40 UTC1h 35m
2026-05-25 RYR5UM ALC → HEL May 25, 07:30 UTCMay 25, 09:10 UTC1h 40m
2026-05-25 RYR6882 MAH → BCN May 25, 05:50 UTCMay 25, 06:25 UTC35m
2026-05-25 RYR1SR CRL → TRN May 25, 04:15 UTCMay 25, 04:55 UTC40m
2026-05-24 RYR7EM DUB → CLJ May 24, 17:30 UTCMay 24, 19:05 UTC1h 35m
2026-05-24 RYR9KG EGC → STN May 24, 14:55 UTCMay 24, 16:30 UTC1h 35m
2026-05-24 RYR17KF NAP → BCN May 24, 11:35 UTCMay 24, 13:00 UTC1h 25m
2026-05-24 RYR84TT CRL → PUY May 24, 08:50 UTCMay 24, 10:25 UTC1h 35m
2026-05-24 RYR72NK ABZ → ALC May 24, 06:05 UTCMay 24, 07:10 UTC1h 5m
2026-05-24 RYR161N BCN → MXP May 24, 03:55 UTCMay 24, 05:05 UTC1h 10m
2026-05-23 RYR8AG BER → AGP May 23, 20:45 UTCMay 23, 22:45 UTC2h 0m
2026-05-23 RYR45ER MLA → BFS May 23, 17:45 UTCMay 23, 19:50 UTC2h 5m
2026-05-23 RYR44WJ VCE → BCN May 23, 14:45 UTCMay 23, 16:05 UTC1h 20m
2026-05-23 RYR12SK LIS → VLC May 23, 12:20 UTCMay 23, 13:45 UTC1h 25m
2026-05-23 RYR6188 BLQ → BER May 23, 09:15 UTCMay 23, 10:55 UTC1h 40m
2026-05-23 RYR6189 BER → BLQ May 23, 06:25 UTCMay 23, 08:15 UTC1h 50m
2026-05-17 RYR72NK ABZ → ALC May 17, 06:15 UTCMay 17, 07:30 UTC1h 15m
2026-05-17 RYR161N BCN → MXP May 17, 03:55 UTCMay 17, 05:00 UTC1h 5m
2026-05-16 RYR119T PED → ALC May 16, 21:40 UTCMay 16, 23:00 UTC1h 20m
2026-05-16 RYR55BJ GDN → ARN May 16, 19:20 UTCMay 16, 20:30 UTC1h 10m
2026-05-16 RYR45WG NCL → BCN May 16, 15:40 UTCMay 16, 17:50 UTC2h 10m
2026-05-16 RYR2TT BLL → SVQ May 16, 12:25 UTCMay 16, 14:41 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-DWO page for operator, model, and routing details .

Mode-S 4CA61C frequently asked

What is Mode-S code 4CA61C?
4CA61C is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-DWO.
Where is Mode-S 4CA61C registered?
Mode-S code 4CA61C is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA61C broadcasting right now?
Yes. Mode-S 4CA61C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA61C, octal 23123034, decimal 5,023,260.
What flights does 4CA61C operate?
Mode-S 4CA61C has broadcast 20 distinct callsigns, including RYR5TY, RYR27ST, RYR99ZG, RYR89XQ, RYR80JJ.