Apparatus

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sensors Mode-S transponder

4CAFC1

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GSJ · BOEING 737-800

Hex
4CAFC1
Octal
23127701
Decimal
5,025,729
Country
IE
Tail
EI-GSJ
Type
B738
Broadcasting now · callsign RYR26TR · 35,000 ft
Flights observed
80
Distinct callsigns
20
Country
IE
Last broadcast
31m ago

Current position

4CAFC1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAFC1 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
RYR5GG Ryanair 3 2026-05-25
RYR34DV Ryanair 3 2026-05-25
RYR9GR Ryanair 2 2026-05-26
RYR941 Ryanair 2 2026-04-17
RYR92XY - 2 2026-04-14
RYR91SU - 2 2026-04-14
RYR8AU - 2 2026-04-14
RYR84RP - 2 2026-04-15
RYR81SD - 2 2026-04-15
RYR7ZN Ryanair 2 2026-04-16
RYR6SM Ryanair 2 2026-04-16
RYR4MM - 2 2026-04-14
RYR2NR Ryanair 2 2026-05-26
RYR2LF - 2 2026-04-16
RYR2JY Ryanair 2 2026-04-16
RYR1JG Ryanair 2 2026-04-15
RYR9YF Ryanair 1 2026-05-25
RYR95AT Ryanair 1 2026-05-29
RYR91EJ Ryanair 1 2026-05-27
RYR908N Ryanair 1 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 RYR26TR VCE → CTA May 30, 04:05 UTCMay 30, 04:15 UTC10m
2026-05-29 RYR11TG SUF → VCE May 29, 20:40 UTCMay 29, 21:55 UTC1h 15m
2026-05-29 RYR5AZ STN → ACE May 29, 18:50 UTCMay 29, 19:55 UTC1h 5m
2026-05-29 RYR5ZL BRI → VCE May 29, 16:50 UTCMay 29, 17:50 UTC1h 0m
2026-05-29 RYR95AT DUB → LPA May 29, 14:40 UTCMay 29, 15:35 UTC55m
2026-05-29 RYR6WA BUD → BRS May 29, 11:35 UTCMay 29, 13:40 UTC2h 5m
2026-05-29 RYR908N BLQ → MAD May 29, 07:20 UTCMay 29, 09:10 UTC1h 50m
2026-05-29 RYR88NB MAD → BLQ May 29, 04:45 UTCMay 29, 06:30 UTC1h 45m
2026-05-28 RYR3UU ALC → MAN May 28, 22:00 UTCMay 28, 23:35 UTC1h 35m
2026-05-28 RYR3DM LTN → AGP May 28, 18:30 UTCMay 28, 20:00 UTC1h 30m
2026-05-28 RYR65DV BLQ → KBP May 28, 14:05 UTCMay 28, 16:10 UTC2h 5m
2026-05-28 RYR7GR OTP → VIE May 28, 11:30 UTCMay 28, 12:15 UTC45m
2026-05-28 RYR1KZ BUD → EDI May 28, 07:20 UTCMay 28, 09:55 UTC2h 35m
2026-05-28 RYR26LR CHQ → SKG May 28, 05:15 UTCMay 28, 06:10 UTC55m
2026-05-28 RYR4982 SKG → CHQ May 28, 03:30 UTCMay 28, 04:20 UTC50m
2026-05-27 RYR2171 BTS → SKG May 27, 21:00 UTCMay 27, 22:15 UTC1h 15m
2026-05-27 RYR773T SKG → BTS May 27, 18:40 UTCMay 27, 20:05 UTC1h 25m
2026-05-27 RYR1KY WRO → MLA May 27, 16:15 UTCMay 27, 17:55 UTC1h 40m
2026-05-27 RYR91EJ CAG → BGY May 27, 13:30 UTCMay 27, 14:35 UTC1h 5m
2026-05-27 RYR6AQ BHX → GNB May 27, 11:25 UTCMay 27, 12:25 UTC1h 0m
2026-05-26 RYR52TC PMO → FMM May 26, 21:20 UTCMay 26, 22:54 UTC1h 35m
2026-05-26 RYR3SG BER → BRU May 26, 18:50 UTCMay 26, 20:24 UTC1h 35m
2026-05-26 RYR9GR BDS → BGY May 26, 16:35 UTCMay 26, 17:44 UTC1h 10m
2026-05-26 RYR2NR BGY → BDS May 26, 14:30 UTCMay 26, 15:49 UTC1h 20m
2026-05-26 RYR3YU FAO → BER May 26, 11:34 UTCMay 26, 13:24 UTC1h 50m
2026-05-26 RYR2WZ WMI → LIS May 26, 08:54 UTCMay 26, 10:44 UTC1h 50m
2026-05-26 RYR33FG CTA → BGY May 26, 06:34 UTCMay 26, 07:59 UTC1h 25m
2026-05-26 RYR2261 BGY → CTA May 26, 04:10 UTCMay 26, 05:34 UTC1h 25m
2026-05-25 RYR9YF VLC → BGY May 25, 20:24 UTCMay 25, 22:00 UTC1h 35m
2026-05-25 RYR13GH BGY → VLC May 25, 17:50 UTCMay 25, 19:20 UTC1h 30m
2026-05-25 RYR75ZH CTA → BGY May 25, 15:30 UTCMay 25, 16:50 UTC1h 20m
2026-05-25 RYR7EK CIA → LIS May 25, 13:00 UTCMay 25, 14:25 UTC1h 25m
2026-05-25 RYR5GG AGP → EIN May 25, 08:40 UTCMay 25, 11:20 UTC2h 40m
2026-05-25 RYR34DV BGY → RAK May 25, 04:25 UTCMay 25, 07:05 UTC2h 40m
2026-05-24 RYR4786 BGY → QSR May 24, 20:00 UTCMay 24, 21:00 UTC1h 0m
2026-05-24 RYR34FU VLC → WRO May 24, 18:00 UTCMay 24, 19:15 UTC1h 15m
2026-05-24 RYR1AP STN → VIE May 24, 15:50 UTCMay 24, 16:55 UTC1h 5m
2026-05-24 RYR9GR BDS → BGY May 24, 13:45 UTCMay 24, 14:55 UTC1h 10m
2026-05-24 RYR2NR BGY → BDS May 24, 11:30 UTCMay 24, 12:50 UTC1h 20m
2026-05-24 RYR104M - May 24, 06:20 UTCMay 24, 07:35 UTC1h 15m
2026-04-17 ACETEST BUD → BUD Apr 17, 10:20 UTCApr 17, 10:40 UTC20m
2026-04-17 RYR941 SNN → VIE Apr 17, 07:20 UTCApr 17, 07:25 UTC5m
2026-04-17 RYR941 SNN → VIE Apr 17, 06:50 UTCApr 17, 07:15 UTC25m
2026-04-16 RYR2JY OTP → DUB Apr 16, 23:20 UTCApr 17, 00:00 UTC40m
2026-04-16 RYR2JY OTP → DUB Apr 16, 21:20 UTCApr 16, 23:10 UTC1h 50m
2026-04-16 RYR2LF - Apr 16, 19:15 UTCApr 16, 20:10 UTC55m
2026-04-16 RYR2LF - Apr 16, 17:40 UTCApr 16, 19:10 UTC1h 30m
2026-04-16 RYR2324 GRO → LBA Apr 16, 15:50 UTCApr 16, 16:35 UTC45m
2026-04-16 RYR7ZN EIN → DUB Apr 16, 13:15 UTCApr 16, 14:40 UTC1h 25m
2026-04-16 RYR7ZN EIN → DUB Apr 16, 12:19 UTCApr 16, 13:05 UTC45m

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

Mode-S 4CAFC1 frequently asked

What is Mode-S code 4CAFC1?
4CAFC1 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GSJ.
Where is Mode-S 4CAFC1 registered?
Mode-S code 4CAFC1 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAFC1 broadcasting right now?
Yes. Mode-S 4CAFC1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAFC1, octal 23127701, decimal 5,025,729.
What flights does 4CAFC1 operate?
Mode-S 4CAFC1 has broadcast 20 distinct callsigns, including RYR5GG, RYR34DV, RYR9GR, RYR941, RYR92XY.