Apparatus

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sensors Mode-S transponder

4CAC54

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HGP · BOEING 737 MAX 8

Hex
4CAC54
Octal
23126124
Decimal
5,024,852
Country
IE
Tail
EI-HGP
Type
B38M
Broadcasting now · callsign RYR73HD · 37,000 ft
Flights observed
273
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Current position

4CAC54 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAC54 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
RYR94GZ Ryanair 3 2026-04-13
RYR63XT Ryanair 3 2026-05-26
RYR5FG - 3 2026-04-14
RYR57MU - 3 2026-04-13
RYR36NY Ryanair 3 2026-05-16
RYR2YM Ryanair 3 2026-04-18
RYR1SJ Ryanair 3 2026-05-26
RYR9JW Ryanair 2 2026-05-23
RYR98FB Ryanair 2 2026-04-17
RYR97WV Ryanair 2 2026-05-12
RYR96EU Ryanair 2 2026-05-12
RYR9654 Ryanair 2 2026-04-21
RYR94PB Ryanair 2 2026-04-17
RYR8SQ Ryanair 2 2026-05-12
RYR8DZ Ryanair 2 2026-05-20
RYR88AA - 2 2026-04-21
RYR85UA Ryanair 2 2026-04-14
RYR85QU Ryanair 2 2026-04-15
RYR83LD Ryanair 2 2026-05-27
RYR76UD - 2 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 RYR9AQ KTW → DUB May 30, 10:00 UTCMay 30, 12:00 UTC2h 0m
2026-05-30 RYR2KD CTA → MRS May 30, 08:05 UTCMay 30, 09:00 UTC55m
2026-05-30 RYR44JG OPO → SVQ May 30, 06:15 UTCMay 30, 07:10 UTC55m
2026-05-29 RYR61AP BRU → OPO May 29, 19:05 UTCMay 29, 21:20 UTC2h 15m
2026-05-29 RYR78FL OPO → BRU May 29, 16:20 UTCMay 29, 18:15 UTC1h 55m
2026-05-29 RYR4JM VCE → STN May 29, 13:55 UTCMay 29, 15:10 UTC1h 15m
2026-05-29 RYR526B OPO → TLS May 29, 11:50 UTCMay 29, 13:05 UTC1h 15m
2026-05-29 RYR11LH STN → OPO May 29, 08:45 UTCMay 29, 10:45 UTC2h 0m
2026-05-28 RYR3GX FEZ → EIN May 28, 22:05 UTCMay 28, 23:35 UTC1h 30m
2026-05-28 RYR59DR TSF → MLA May 28, 19:50 UTCMay 28, 21:15 UTC1h 25m
2026-05-28 RYR39FX AAR → STN May 28, 17:40 UTCMay 28, 18:55 UTC1h 15m
2026-05-28 RYR9SE STN → AAR May 28, 15:40 UTCMay 28, 16:50 UTC1h 10m
2026-05-28 RYR37SU OTP → STN May 28, 11:35 UTCMay 28, 14:30 UTC2h 55m
2026-05-28 RYR69TW STN → OTP May 28, 08:00 UTCMay 28, 10:35 UTC2h 35m
2026-05-28 RYR4UU AGA → FEZ May 28, 04:15 UTCMay 28, 06:40 UTC2h 25m
2026-05-27 RYR83LD CPH → AGP May 27, 16:45 UTCMay 27, 20:00 UTC3h 15m
2026-05-27 RYR26RY AGP → CPH May 27, 12:45 UTCMay 27, 15:50 UTC3h 5m
2026-05-27 RYR30FY EDI → IBZ May 27, 08:50 UTCMay 27, 11:20 UTC2h 30m
2026-05-27 RYR25ZE AGP → BRU May 27, 05:29 UTCMay 27, 07:45 UTC2h 15m
2026-05-26 RYR1SJ EIN → AGP May 26, 18:24 UTCMay 26, 22:35 UTC4h 10m
2026-05-26 RYR63XT AGP → ARN May 26, 13:45 UTCMay 26, 17:25 UTC3h 40m
2026-05-26 RYR22XB MAN → AGP May 26, 07:34 UTCMay 26, 10:05 UTC2h 30m
2026-05-26 RYR12ZM AGP → MAN May 26, 04:00 UTCMay 26, 06:25 UTC2h 25m
2026-05-25 RYR34FK AMS → AGP May 25, 17:50 UTCMay 25, 20:19 UTC2h 30m
2026-05-25 RYR847E AGP → AMS May 25, 14:05 UTCMay 25, 16:30 UTC2h 25m
2026-05-25 RYR1SJ EIN → AGP May 25, 08:45 UTCMay 25, 12:45 UTC4h 0m
2026-05-25 RYR63XT AGP → ARN May 25, 04:00 UTCMay 25, 07:45 UTC3h 45m
2026-05-24 RYR29WR LPL → AGP May 24, 17:50 UTCMay 24, 20:15 UTC2h 25m
2026-05-24 RYR5LZ ORK → STN May 24, 14:30 UTCMay 24, 16:55 UTC2h 25m
2026-05-24 RYR46QC WAW → AGP May 24, 09:55 UTCMay 24, 13:15 UTC3h 20m
2026-05-24 RYR35XL AGP → WAW May 24, 05:20 UTCMay 24, 09:00 UTC3h 40m
2026-05-23 RYR1SJ EIN → AGP May 23, 18:05 UTCMay 23, 22:00 UTC3h 56m
2026-05-23 RYR63XT AGP → ARN May 23, 13:20 UTCMay 23, 17:15 UTC3h 55m
2026-05-23 RYR9JW LPL → ALC May 23, 09:35 UTCMay 23, 12:05 UTC2h 30m
2026-05-23 RYR4KR AGP → EIN May 23, 06:00 UTCMay 23, 08:25 UTC2h 25m
2026-05-22 RYR83LD CPH → AGP May 22, 19:00 UTCMay 22, 22:20 UTC3h 20m
2026-05-22 RYR26RY AGP → CPH May 22, 14:45 UTCMay 22, 18:00 UTC3h 15m
2026-05-22 RYR7HY GOT → EDI May 22, 10:15 UTCMay 22, 13:05 UTC2h 50m
2026-05-22 RYR8RV BOH → RMU May 22, 06:30 UTCMay 22, 09:05 UTC2h 35m
2026-05-21 RYR33PK KRK → AGP May 21, 19:45 UTCMay 21, 22:45 UTC3h 0m
2026-05-21 RYR17MN AGP → KRK May 21, 15:25 UTCMay 21, 18:50 UTC3h 25m
2026-05-21 RYR73AH GLA → AGP May 21, 09:15 UTCMay 21, 12:15 UTC3h 0m
2026-05-21 RYR8AB NCL → BCN May 21, 05:25 UTCMay 21, 08:10 UTC2h 45m
2026-05-20 RYR8DZ PIK → LPA May 20, 18:25 UTCMay 20, 21:00 UTC2h 35m
2026-05-20 RYR34KB AGP → MAN May 20, 14:50 UTCMay 20, 17:30 UTC2h 40m
2026-05-20 RYR30FY EDI → IBZ May 20, 08:50 UTCMay 20, 11:15 UTC2h 25m
2026-05-20 RYR25ZE AGP → BRU May 20, 05:25 UTCMay 20, 07:50 UTC2h 25m
2026-05-19 RYR144G OPO → AGP May 19, 22:15 UTCMay 19, 23:05 UTC50m
2026-05-19 RYR7635 AGP → OPO May 19, 20:20 UTCMay 19, 21:25 UTC1h 5m
2026-05-19 RYR51MW PAD → AGP May 19, 16:15 UTCMay 19, 19:00 UTC2h 45m

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

Mode-S 4CAC54 frequently asked

What is Mode-S code 4CAC54?
4CAC54 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HGP.
Where is Mode-S 4CAC54 registered?
Mode-S code 4CAC54 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC54 broadcasting right now?
Yes. Mode-S 4CAC54 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC54, octal 23126124, decimal 5,024,852.
What flights does 4CAC54 operate?
Mode-S 4CAC54 has broadcast 20 distinct callsigns, including RYR94GZ, RYR63XT, RYR5FG, RYR57MU, RYR36NY.