Apparatus

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sensors Mode-S transponder

4CADC1

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-IGO · BOEING 737 MAX 8

Hex
4CADC1
Octal
23126701
Decimal
5,025,217
Country
IE
Tail
EI-IGO
Type
B38M
Broadcasting now · callsign RYR28CC · 22,475 ft
Flights observed
278
Distinct callsigns
20
Country
IE
Last broadcast
5h ago

Current position

4CADC1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CADC1 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
RYR6UR Ryanair 6 2026-05-26
RYR9VB Ryanair 5 2026-05-29
RYR99CN Ryanair 5 2026-05-26
RYR612X - 5 2026-04-17
RYR4TC Ryanair 5 2026-05-26
RYR399Y Ryanair 5 2026-05-26
RYR35VV Ryanair 5 2026-04-17
RYR1KH Ryanair 5 2026-05-29
RYR4UL Ryanair 4 2026-05-29
RYR28CC Ryanair 4 2026-05-29
RYR213T - 4 2026-04-17
RYR98RQ Ryanair 3 2026-05-27
RYR9249 Ryanair 3 2026-04-17
RYR8XR Ryanair 3 2026-04-16
RYR88ZF Ryanair 3 2026-05-27
RYR81WZ Ryanair 3 2026-05-27
RYR68NX Ryanair 3 2026-05-27
RYR5WY - 3 2026-04-15
RYR45MZ Ryanair 3 2026-05-23
RYR42HH - 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 RYR66ZD SCQ → BGY May 29, 21:50 UTCMay 29, 22:55 UTC1h 5m
2026-05-29 RYR9749 CPH → WMI May 29, 20:15 UTCMay 29, 21:10 UTC55m
2026-05-29 RYR6ZE BLQ → CPH May 29, 17:35 UTCMay 29, 19:30 UTC1h 55m
2026-05-29 RYR9BJ CPH → BLQ May 29, 14:45 UTCMay 29, 16:25 UTC1h 40m
2026-05-29 RYR9VB AGP → TRF May 29, 12:05 UTCMay 29, 13:40 UTC1h 35m
2026-05-29 RYR1KH TFS → BHX May 29, 09:50 UTCMay 29, 11:15 UTC1h 25m
2026-05-29 RYR4UL NRN → AOI May 29, 07:15 UTCMay 29, 09:00 UTC1h 45m
2026-05-29 RYR28CC CPH → BGY May 29, 04:40 UTCMay 29, 06:20 UTC1h 40m
2026-05-28 RYR99WT STN → CPH May 28, 21:35 UTCMay 28, 22:50 UTC1h 15m
2026-05-28 RYR57MU CPH → STN May 28, 19:10 UTCMay 28, 20:35 UTC1h 25m
2026-05-28 RYR51KK STN → CPH May 28, 17:05 UTCMay 28, 18:20 UTC1h 15m
2026-05-28 RYR7NT RIX → CGN May 28, 14:30 UTCMay 28, 16:00 UTC1h 30m
2026-05-28 RYR605 CRL → MAD May 28, 11:50 UTCMay 28, 13:30 UTC1h 40m
2026-05-28 RYR22ZE CPH → BUD May 28, 08:45 UTCMay 28, 10:10 UTC1h 25m
2026-05-28 RYR9266 BVA → CPH May 28, 06:30 UTCMay 28, 07:55 UTC1h 25m
2026-05-28 RYR9267 CPH → BVA May 28, 04:10 UTCMay 28, 05:35 UTC1h 25m
2026-05-27 RYR81WZ PSA → CPH May 27, 19:50 UTCMay 27, 21:45 UTC1h 55m
2026-05-27 RYR88ZF CPH → PSA May 27, 16:20 UTCMay 27, 18:15 UTC1h 55m
2026-05-27 RYR58UE STN → CPH May 27, 14:15 UTCMay 27, 15:30 UTC1h 15m
2026-05-27 RYR7JU CPH → STN May 27, 11:50 UTCMay 27, 13:20 UTC1h 30m
2026-05-27 RYR68NX FCO → CPH May 27, 08:30 UTCMay 27, 10:35 UTC2h 5m
2026-05-27 RYR98RQ CPH → FCO May 27, 05:09 UTCMay 27, 07:10 UTC2h 0m
2026-05-26 RYR4BN KIR → HHN May 26, 20:29 UTCMay 26, 21:59 UTC1h 30m
2026-05-26 RYR23VX CPH → BGY May 26, 17:50 UTCMay 26, 19:34 UTC1h 45m
2026-05-26 RYR9VB AGP → TRF May 26, 15:24 UTCMay 26, 16:59 UTC1h 35m
2026-05-26 RYR1KH TFS → BHX May 26, 13:04 UTCMay 26, 14:24 UTC1h 20m
2026-05-26 RYR6UR BRS → DUB May 26, 10:50 UTCMay 26, 11:54 UTC1h 5m
2026-05-26 RYR4TC CPH → PRG May 26, 08:30 UTCMay 26, 09:29 UTC1h 0m
2026-05-26 RYR99CN KRK → CPH May 26, 06:14 UTCMay 26, 07:29 UTC1h 15m
2026-05-26 RYR399Y CPH → KRK May 26, 04:20 UTCMay 26, 05:25 UTC1h 5m
2026-05-25 RYR87SQ PMO → PMF May 25, 20:19 UTCMay 25, 23:19 UTC3h 0m
2026-05-25 RYR220U CPH → OPO May 25, 16:15 UTCMay 25, 19:20 UTC3h 5m
2026-05-25 RYR81WZ PSA → CPH May 25, 13:05 UTCMay 25, 15:00 UTC1h 55m
2026-05-25 RYR88ZF CPH → PSA May 25, 09:35 UTCMay 25, 11:30 UTC1h 55m
2026-05-25 RYR58UE STN → CPH May 25, 07:25 UTCMay 25, 08:40 UTC1h 15m
2026-05-25 RYR7JU CPH → STN May 25, 04:55 UTCMay 25, 06:20 UTC1h 25m
2026-05-24 RYR4BN KIR → HHN May 24, 20:10 UTCMay 24, 21:50 UTC1h 40m
2026-05-24 RYR23VX CPH → BGY May 24, 17:30 UTCMay 24, 19:15 UTC1h 45m
2026-05-24 RYR81WZ PSA → CPH May 24, 14:45 UTCMay 24, 16:40 UTC1h 55m
2026-05-24 RYR88ZF CPH → PSA May 24, 11:55 UTCMay 24, 13:50 UTC1h 55m
2026-05-24 RYR68NX FCO → CPH May 24, 08:45 UTCMay 24, 10:55 UTC2h 10m
2026-05-24 RYR98RQ CPH → FCO May 24, 05:35 UTCMay 24, 07:30 UTC1h 55m
2026-05-23 RYR9266 BVA → CPH May 23, 20:25 UTCMay 23, 21:55 UTC1h 30m
2026-05-23 RYR9267 CPH → BVA May 23, 18:20 UTCMay 23, 19:35 UTC1h 15m
2026-05-23 RYR45MZ BGY → CPH May 23, 15:50 UTCMay 23, 17:35 UTC1h 45m
2026-05-23 RYR40QM CPH → BGY May 23, 13:10 UTCMay 23, 14:50 UTC1h 40m
2026-05-23 RYR87SQ PMO → PMF May 23, 09:25 UTCMay 23, 12:15 UTC2h 50m
2026-05-23 RYR220U CPH → OPO May 23, 05:20 UTCMay 23, 08:30 UTC3h 10m
2026-05-22 RYR7621 KUN → CPH May 22, 20:55 UTCMay 22, 22:05 UTC1h 10m
2026-05-22 RYR871 BRS → TRN May 22, 19:10 UTCMay 22, 20:20 UTC1h 10m

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

Mode-S 4CADC1 frequently asked

What is Mode-S code 4CADC1?
4CADC1 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-IGO.
Where is Mode-S 4CADC1 registered?
Mode-S code 4CADC1 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CADC1 broadcasting right now?
Yes. Mode-S 4CADC1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CADC1, octal 23126701, decimal 5,025,217.
What flights does 4CADC1 operate?
Mode-S 4CADC1 has broadcast 20 distinct callsigns, including RYR6UR, RYR9VB, RYR99CN, RYR612X, RYR4TC.