Apparatus

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sensors Mode-S transponder

4CAC55

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HGR · BOEING 737 MAX 8

Hex
4CAC55
Octal
23126125
Decimal
5,024,853
Country
IE
Tail
EI-HGR
Type
B38M
Broadcasting now · callsign RYR47XV · 11,175 ft
Flights observed
509
Distinct callsigns
20
Country
IE
Last broadcast
8h ago

Current position

4CAC55 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAC55 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
RYR3WD - 8 2026-07-09
RYR088 - 8 2026-07-09
RYR89XA Ryanair 6 2026-05-28
RYR5TP Ryanair 6 2026-05-28
RYR26ZX Ryanair 6 2026-06-07
RYR9DC Ryanair 5 2026-06-04
RYR72ZY - 5 2026-07-09
RYR61ME Ryanair 5 2026-06-06
RYR55AR - 5 2026-07-09
RYR98HW - 4 2026-07-06
RYR97GU - 4 2026-05-15
RYR49JV Ryanair 4 2026-06-06
RYR48UW - 4 2026-04-18
RYR43JZ Ryanair 4 2026-05-15
RYR3MC Ryanair 4 2026-06-06
RYR25UK Ryanair 4 2026-05-15
RYR1AA Ryanair 4 2026-05-05
RYR10AM Ryanair 4 2026-06-04
RYR103K - 4 2026-07-06
RYR985X Ryanair 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RYR1KW - Jul 13, 20:25 UTCJul 13, 22:20 UTC1h 55m
2026-07-13 RYR14AU - Jul 13, 17:35 UTCJul 13, 19:15 UTC1h 40m
2026-07-13 RYR9ZM - Jul 13, 14:45 UTCJul 13, 16:40 UTC1h 55m
2026-07-13 RYR61CT ALC → FCO Jul 13, 11:40 UTCJul 13, 13:10 UTC1h 30m
2026-07-13 RYR1LP DUB → ALC Jul 13, 07:50 UTCJul 13, 10:15 UTC2h 25m
2026-07-13 RYR79GF ALC → DUB Jul 13, 04:05 UTCJul 13, 06:25 UTC2h 20m
2026-07-12 RYR284 TRN → ALC Jul 12, 20:55 UTCJul 12, 22:40 UTC1h 45m
2026-07-12 RYR483Z - Jul 12, 18:10 UTCJul 12, 19:45 UTC1h 35m
2026-07-12 RYR3XA BOH → ALC Jul 12, 14:15 UTCJul 12, 16:20 UTC2h 5m
2026-07-12 RYR2XN ALC → BOH Jul 12, 11:20 UTCJul 12, 13:20 UTC2h 0m
2026-07-12 RYR84YM - Jul 12, 07:40 UTCJul 12, 09:50 UTC2h 10m
2026-07-12 RYR469 - Jul 12, 04:45 UTCJul 12, 06:45 UTC2h 0m
2026-07-11 RYR7R SVQ → ALC Jul 11, 20:35 UTCJul 11, 21:30 UTC55m
2026-07-11 RYR39AN - Jul 11, 18:55 UTCJul 11, 19:45 UTC50m
2026-07-11 RYR122L NOC → ALC Jul 11, 15:25 UTCJul 11, 17:55 UTC2h 30m
2026-07-11 RYR89WB - Jul 11, 12:05 UTCJul 11, 14:30 UTC2h 25m
2026-07-11 RYR9085 EMA → ALC Jul 11, 07:35 UTCJul 11, 09:45 UTC2h 10m
2026-07-10 RYR38WH - Jul 10, 22:35 UTCJul 11, 00:20 UTC1h 45m
2026-07-10 RYR8958 ARN → MLA Jul 10, 20:05 UTCJul 10, 21:45 UTC1h 40m
2026-07-10 RYR378Z DUB → EMA Jul 10, 18:25 UTCJul 10, 19:00 UTC35m
2026-07-10 RYR3LC - Jul 10, 15:50 UTCJul 10, 16:45 UTC55m
2026-07-10 RYR4RZ TLS → STN Jul 10, 13:10 UTCJul 10, 14:40 UTC1h 30m
2026-07-10 RYR73LC TLS → TLS Jul 10, 05:55 UTCJul 10, 11:40 UTC5h 45m
2026-07-09 RYR9EN - Jul 9, 21:15 UTCJul 9, 22:05 UTC50m
2026-07-09 RYR4239 - Jul 9, 19:30 UTCJul 9, 20:15 UTC45m
2026-07-09 RYR693D LIS → TLS Jul 9, 17:15 UTCJul 9, 18:40 UTC1h 25m
2026-07-09 RYR55AR - Jul 9, 13:35 UTCJul 9, 15:40 UTC2h 5m
2026-07-09 RYR72ZY - Jul 9, 10:20 UTCJul 9, 12:15 UTC1h 55m
2026-07-09 RYR3WD FNC → LIS Jul 9, 08:00 UTCJul 9, 09:15 UTC1h 15m
2026-07-09 RYR088 LIS → FNC Jul 9, 05:40 UTCJul 9, 07:10 UTC1h 30m
2026-07-08 RYR6GN - Jul 8, 19:40 UTCJul 8, 22:00 UTC2h 20m
2026-07-08 RYR1887 LIS → STN Jul 8, 16:30 UTCJul 8, 18:40 UTC2h 10m
2026-07-08 RYR76WW - Jul 8, 12:45 UTCJul 8, 15:10 UTC2h 25m
2026-07-08 RYR85QU VNO → STN Jul 8, 09:00 UTCJul 8, 11:20 UTC2h 20m
2026-07-08 RYR1KL - Jul 8, 05:50 UTCJul 8, 08:00 UTC2h 10m
2026-07-07 RYR151M - Jul 7, 21:00 UTCJul 7, 23:35 UTC2h 35m
2026-07-07 RYR29RB - Jul 7, 17:35 UTCJul 7, 19:55 UTC2h 20m
2026-07-07 RYR3YW BER → STN Jul 7, 15:00 UTCJul 7, 16:25 UTC1h 25m
2026-07-07 RYR7QZ - Jul 7, 12:45 UTCJul 7, 14:00 UTC1h 15m
2026-07-07 RYR67XW PLQ → STN Jul 7, 09:45 UTCJul 7, 11:50 UTC2h 5m
2026-07-07 RYR95DF - Jul 7, 06:55 UTCJul 7, 08:50 UTC1h 55m
2026-07-06 RYR4CB LIS → STN Jul 6, 17:55 UTCJul 6, 20:10 UTC2h 15m
2026-07-06 RYR98HW BER → LIS Jul 6, 12:55 UTCJul 6, 16:10 UTC3h 15m
2026-07-06 RYR103K LIS → BER Jul 6, 08:45 UTCJul 6, 11:45 UTC3h 0m
2026-07-05 RYR3WD FNC → LIS Jul 5, 08:00 UTCJul 5, 09:15 UTC1h 15m
2026-07-05 RYR088 LIS → FNC Jul 5, 05:45 UTCJul 5, 07:10 UTC1h 25m
2026-07-04 RYR85MR VIE → LIS Jul 4, 16:30 UTCJul 4, 20:00 UTC3h 30m
2026-07-04 RYR5DQ LIS → VIE Jul 4, 12:35 UTCJul 4, 15:40 UTC3h 5m
2026-07-04 RYR29TL - Jul 4, 08:40 UTCJul 4, 11:10 UTC2h 30m
2026-07-04 RYR498R LIS → CRL Jul 4, 05:25 UTCJul 4, 07:40 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-HGR page for operator, model, and routing details .

Mode-S 4CAC55 frequently asked

What is Mode-S code 4CAC55?
4CAC55 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HGR.
Where is Mode-S 4CAC55 registered?
Mode-S code 4CAC55 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC55 broadcasting right now?
Yes. Mode-S 4CAC55 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC55, octal 23126125, decimal 5,024,853.
What flights does 4CAC55 operate?
Mode-S 4CAC55 has broadcast 20 distinct callsigns, including RYR3WD, RYR088, RYR89XA, RYR5TP, RYR26ZX.