Apparatus

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sensors Mode-S transponder

4CAA61

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-EXF · BOEING 737-800

Hex
4CAA61
Octal
23125141
Decimal
5,024,353
Country
IE
Tail
EI-EXF
Type
B738
Broadcasting now · callsign RYR499 · 37,000 ft
Flights observed
271
Distinct callsigns
20
Country
IE
Last broadcast
43m ago

Current position

4CAA61 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAA61 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
RYR47GL Ryanair 6 2026-06-10
RYR18PG Ryanair 6 2026-06-10
RYR95WE Ryanair 5 2026-06-09
RYR926T Ryanair 5 2026-06-07
RYR15EC Ryanair 5 2026-06-09
RYR9957 Ryanair 4 2026-06-09
RYR95LU Ryanair 4 2026-05-29
RYR95JY Ryanair 4 2026-06-07
RYR732U Ryanair 4 2026-05-29
RYR5VJ Ryanair 4 2026-06-08
RYR5GE Ryanair 4 2026-05-30
RYR48MU Ryanair 4 2026-06-08
RYR2CP Ryanair 4 2026-06-09
RYR1DA Ryanair 4 2026-05-30
RYR9WD Ryanair 3 2026-06-05
RYR9209 Ryanair 3 2026-06-09
RYR88SA Ryanair 3 2026-06-08
RYR83XQ Ryanair 3 2026-06-10
RYR39WL Ryanair 3 2026-06-08
RYR2H Ryanair 3 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-15 RYR499 DUB → PSA Jun 15, 15:45 UTCJun 15, 16:15 UTC30m
2026-06-15 RYR17VM BVA → FCO Jun 15, 12:49 UTCJun 15, 14:30 UTC1h 40m
2026-06-15 RYR8DN FCO → BVA Jun 15, 10:05 UTCJun 15, 11:54 UTC1h 50m
2026-06-15 RYR9GH ALC → MAN Jun 15, 07:05 UTCJun 15, 08:29 UTC1h 25m
2026-06-15 RYR87PG FCO → EFL Jun 15, 05:00 UTCJun 15, 06:15 UTC1h 15m
2026-06-14 RYR3NB GDN → FCO Jun 14, 20:25 UTCJun 14, 22:25 UTC2h 0m
2026-06-14 RYR67JG FCO → GDN Jun 14, 17:20 UTCJun 14, 19:20 UTC2h 0m
2026-06-14 RYR96AH FAO → FCO Jun 14, 13:40 UTCJun 14, 16:00 UTC2h 20m
2026-06-14 RYR5A CPH → BUD Jun 14, 10:10 UTCJun 14, 12:45 UTC2h 35m
2026-06-14 RYR3JU FAO → EIN Jun 14, 06:10 UTCJun 14, 08:50 UTC2h 40m
2026-06-13 RYR96CQ LBA → FAO Jun 13, 18:45 UTCJun 13, 21:20 UTC2h 35m
2026-06-13 RYR9452 DUB → TSF Jun 13, 15:25 UTCJun 13, 17:55 UTC2h 30m
2026-06-13 RYR76PN EDI → MLA Jun 13, 11:00 UTCJun 13, 13:35 UTC2h 35m
2026-06-13 RYR45YU FAO → STN Jun 13, 07:25 UTCJun 13, 09:50 UTC2h 25m
2026-06-12 RYR10QM CRL → FAO Jun 12, 19:35 UTCJun 12, 22:00 UTC2h 25m
2026-06-12 RYR40HP FAO → CRL Jun 12, 16:25 UTCJun 12, 18:45 UTC2h 20m
2026-06-12 RYR5486 OPO → FAO Jun 12, 14:55 UTCJun 12, 15:45 UTC50m
2026-06-12 RYR73HD LUX → OPO Jun 12, 10:45 UTCJun 12, 12:50 UTC2h 5m
2026-06-12 RYR9AQ KTW → DUB Jun 12, 06:05 UTCJun 12, 08:15 UTC2h 10m
2026-06-11 RYR11LH STN → OPO Jun 11, 19:40 UTCJun 11, 21:35 UTC1h 55m
2026-06-11 RYR3EY AGP → DUB Jun 11, 16:20 UTCJun 11, 18:20 UTC2h 0m
2026-06-11 RYR4JM VCE → STN Jun 11, 14:00 UTCJun 11, 15:15 UTC1h 15m
2026-06-11 RYR526B OPO → TLS Jun 11, 11:45 UTCJun 11, 13:15 UTC1h 30m
2026-06-11 RYR4GK CRL → MAN Jun 11, 09:20 UTCJun 11, 10:55 UTC1h 35m
2026-06-11 RYR1873 OPO → FNI Jun 11, 06:45 UTCJun 11, 08:20 UTC1h 35m
2026-06-10 RYR75MA CAG → OPO Jun 10, 20:35 UTCJun 10, 22:40 UTC2h 5m
2026-06-10 RYR96SX FKB → CAG Jun 10, 17:50 UTCJun 10, 19:10 UTC1h 20m
2026-06-10 RYR27HU TPS → FKB Jun 10, 15:30 UTCJun 10, 17:15 UTC1h 45m
2026-06-10 RYR83XQ FKB → TPS Jun 10, 12:00 UTCJun 10, 13:35 UTC1h 35m
2026-06-10 RYR47GL FEZ → FKB Jun 10, 08:25 UTCJun 10, 11:00 UTC2h 35m
2026-06-10 RYR18PG FKB → FEZ Jun 10, 04:15 UTCJun 10, 06:55 UTC2h 40m
2026-06-09 RYR2CP CRL → ALC Jun 9, 17:40 UTCJun 9, 19:45 UTC2h 5m
2026-06-09 RYR9957 FKB → SKG Jun 9, 14:55 UTCJun 9, 15:50 UTC55m
2026-06-09 RYR15EC PMI → FKB Jun 9, 12:20 UTCJun 9, 14:00 UTC1h 40m
2026-06-09 RYR95WE FKB → PMI Jun 9, 09:35 UTCJun 9, 11:20 UTC1h 45m
2026-06-09 RYR9209 GRO → FKB Jun 9, 07:15 UTCJun 9, 08:30 UTC1h 15m
2026-06-09 RYR2H NCL → WMI Jun 9, 04:30 UTCJun 9, 05:50 UTC1h 20m
2026-06-08 RYR48MU VLC → FKB Jun 8, 19:05 UTCJun 8, 20:50 UTC1h 45m
2026-06-08 RYR5VJ BOD → OPO Jun 8, 16:05 UTCJun 8, 18:00 UTC1h 55m
2026-06-08 RYR5076 SUF → FKB Jun 8, 13:00 UTCJun 8, 14:55 UTC1h 55m
2026-06-08 RYR38JR TPS → STN Jun 8, 10:05 UTCJun 8, 11:50 UTC1h 45m
2026-06-08 RYR39WL ALC → FKB Jun 8, 07:20 UTCJun 8, 09:25 UTC2h 5m
2026-06-08 RYR88SA FKB → ALC Jun 8, 04:10 UTCJun 8, 06:05 UTC1h 55m
2026-06-07 RYR48BF TNG → FKB Jun 7, 17:55 UTCJun 7, 20:35 UTC2h 40m
2026-06-07 RYR97VJ TRF → BGY Jun 7, 14:30 UTCJun 7, 17:00 UTC2h 30m
2026-06-07 RYR2CP CRL → ALC Jun 7, 11:15 UTCJun 7, 13:30 UTC2h 15m
2026-06-07 RYR9957 FKB → SKG Jun 7, 08:40 UTCJun 7, 10:30 UTC1h 50m
2026-06-07 RYR926T STN → FKB Jun 7, 06:45 UTCJun 7, 07:40 UTC55m
2026-06-07 RYR95JY FKB → STN Jun 7, 04:45 UTCJun 7, 05:50 UTC1h 5m
2026-06-06 RYR926T STN → FKB Jun 6, 20:10 UTCJun 6, 21:04 UTC55m

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

Mode-S 4CAA61 frequently asked

What is Mode-S code 4CAA61?
4CAA61 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-EXF.
Where is Mode-S 4CAA61 registered?
Mode-S code 4CAA61 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAA61 broadcasting right now?
Yes. Mode-S 4CAA61 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAA61, octal 23125141, decimal 5,024,353.
What flights does 4CAA61 operate?
Mode-S 4CAA61 has broadcast 20 distinct callsigns, including RYR47GL, RYR18PG, RYR95WE, RYR926T, RYR15EC.