Apparatus

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sensors Mode-S transponder

4CAD39

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HEY · BOEING 737 MAX 8

Hex
4CAD39
Octal
23126471
Decimal
5,025,081
Country
IE
Tail
EI-HEY
Type
B38M
No current signal · last broadcast 6h ago
Flights observed
569
Distinct callsigns
20
Country
IE
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 4CAD39.

Country allocation

The ICAO 24-bit address 4CAD39 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
RYR367 - 7 2026-07-13
RYR272A - 7 2026-07-13
RYR19YB Ryanair 7 2026-05-10
RYR7ZX Ryanair 6 2026-05-10
RYR68ZY Ryanair 6 2026-06-18
RYR2XD - 6 2026-07-13
RYR19QB Ryanair 6 2026-06-18
RYR9TN Ryanair 5 2026-05-12
RYR973Z Ryanair 5 2026-05-10
RYR54RK Ryanair 5 2026-05-10
RYR46JB Ryanair 5 2026-05-08
RYR20NM - 5 2026-05-12
RYR9ZH Ryanair 4 2026-06-18
RYR84LH - 4 2026-07-10
RYR7R Ryanair 4 2026-06-08
RYR7048 - 4 2026-07-10
RYR55RV - 4 2026-07-13
RYR41LT - 4 2026-07-10
RYR373D Ryanair 4 2026-06-18
RYR31QC - 4 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RYR4531 - Jul 14, 18:10 UTCJul 14, 20:20 UTC2h 10m
2026-07-14 RYR2ZK - Jul 14, 15:30 UTCJul 14, 17:05 UTC1h 35m
2026-07-14 RYR94XU - Jul 14, 11:30 UTCJul 14, 13:45 UTC2h 15m
2026-07-14 RYR12AB - Jul 14, 08:45 UTCJul 14, 10:35 UTC1h 50m
2026-07-14 RYR21NF - Jul 14, 06:45 UTCJul 14, 07:55 UTC1h 10m
2026-07-13 RYR2HP MLA → DUB Jul 13, 20:50 UTCJul 14, 00:20 UTC3h 30m
2026-07-13 RYR272A - Jul 13, 18:40 UTCJul 13, 19:05 UTC25m
2026-07-13 RYR367 - Jul 13, 17:10 UTCJul 13, 17:35 UTC25m
2026-07-13 RYR55RV - Jul 13, 14:00 UTCJul 13, 16:20 UTC2h 20m
2026-07-13 RYR2XD MLA → CRL Jul 13, 10:35 UTCJul 13, 13:15 UTC2h 40m
2026-07-13 RYR9AW VIE → MLA Jul 13, 07:35 UTCJul 13, 09:20 UTC1h 45m
2026-07-13 RYR6YZ MLA → VIE Jul 13, 04:45 UTCJul 13, 06:45 UTC2h 0m
2026-07-12 RYR1V - Jul 12, 20:55 UTCJul 12, 21:40 UTC45m
2026-07-12 RYR184R MLA → NAP Jul 12, 18:40 UTCJul 12, 19:30 UTC50m
2026-07-12 RYR3T - Jul 12, 17:05 UTCJul 12, 17:25 UTC20m
2026-07-12 RYR395 - Jul 12, 15:10 UTCJul 12, 15:40 UTC30m
2026-07-12 RYR12ZY ARN → WMI Jul 12, 13:05 UTCJul 12, 14:01 UTC55m
2026-07-12 RYR13QJ - Jul 12, 10:40 UTCJul 12, 11:45 UTC1h 5m
2026-07-12 RYR28TH LUX → MLA Jul 12, 07:45 UTCJul 12, 09:50 UTC2h 5m
2026-07-12 RYR3RM MLA → LUX Jul 12, 04:10 UTCJul 12, 06:45 UTC2h 35m
2026-07-11 RYR55RV - Jul 11, 20:15 UTCJul 11, 22:40 UTC2h 25m
2026-07-11 RYR2XD MLA → CRL Jul 11, 16:50 UTCJul 11, 19:20 UTC2h 30m
2026-07-11 RYR272A - Jul 11, 15:30 UTCJul 11, 15:50 UTC20m
2026-07-11 RYR367 - Jul 11, 14:05 UTCJul 11, 14:30 UTC25m
2026-07-11 RYR878Q - Jul 11, 11:00 UTCJul 11, 12:30 UTC1h 30m
2026-07-11 RYR3871 - Jul 11, 08:35 UTCJul 11, 10:10 UTC1h 35m
2026-07-11 RYR6RG - Jul 11, 06:10 UTCJul 11, 07:45 UTC1h 35m
2026-07-11 RYR196A - Jul 11, 03:50 UTCJul 11, 05:05 UTC1h 15m
2026-07-10 RYR6YN - Jul 10, 23:05 UTCJul 11, 00:00 UTC55m
2026-07-10 RYR7048 - Jul 10, 21:25 UTCJul 10, 22:20 UTC55m
2026-07-10 RYR84LH MAD → MLA Jul 10, 18:15 UTCJul 10, 20:30 UTC2h 15m
2026-07-10 RYR41LT - Jul 10, 14:30 UTCJul 10, 16:55 UTC2h 25m
2026-07-10 RYR16UW MLA → MLA Jul 10, 09:00 UTCJul 10, 13:20 UTC4h 20m
2026-07-10 RYR85JL - Jul 10, 06:40 UTCJul 10, 07:40 UTC1h 0m
2026-07-10 RYR5UP - Jul 10, 04:05 UTCJul 10, 05:20 UTC1h 15m
2026-07-09 RYR6JX - Jul 9, 21:50 UTCJul 9, 23:10 UTC1h 20m
2026-07-09 RYR31QC - Jul 9, 19:25 UTCJul 9, 20:50 UTC1h 25m
2026-07-09 RYR822J - Jul 9, 17:10 UTCJul 9, 18:35 UTC1h 25m
2026-07-09 RYR6EW MLA → BLQ Jul 9, 14:10 UTCJul 9, 15:40 UTC1h 30m
2026-07-09 RYR28EF - Jul 9, 10:50 UTCJul 9, 13:20 UTC2h 30m
2026-07-09 RYR2JG - Jul 9, 07:15 UTCJul 9, 09:50 UTC2h 35m
2026-07-09 RYR272A - Jul 9, 06:00 UTCJul 9, 06:25 UTC25m
2026-07-09 RYR367 - Jul 9, 03:55 UTCJul 9, 04:20 UTC25m
2026-07-09 - - Jul 9, 00:55 UTCJul 9, 01:05 UTC10m
2026-07-08 RYR9245 LDE → MLA Jul 8, 20:45 UTCJul 8, 22:50 UTC2h 5m
2026-07-08 RYR71YQ - Jul 8, 17:50 UTCJul 8, 19:40 UTC1h 50m
2026-07-08 RYR74DF SVQ → MLA Jul 8, 13:45 UTCJul 8, 16:20 UTC2h 35m
2026-07-08 RYR31AZ MLA → SVQ Jul 8, 10:30 UTCJul 8, 13:00 UTC2h 30m
2026-07-08 RYR94PB STN → MLA Jul 8, 06:35 UTCJul 8, 09:30 UTC2h 55m
2026-07-07 RYR10ZF - Jul 7, 21:20 UTCJul 8, 00:35 UTC3h 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-HEY page for operator, model, and routing details .

Mode-S 4CAD39 frequently asked

What is Mode-S code 4CAD39?
4CAD39 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HEY.
Where is Mode-S 4CAD39 registered?
Mode-S code 4CAD39 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAD39 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAD39, octal 23126471, decimal 5,025,081.
What flights does 4CAD39 operate?
Mode-S 4CAD39 has broadcast 20 distinct callsigns, including RYR367, RYR272A, RYR19YB, RYR7ZX, RYR68ZY.