Apparatus

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sensors Mode-S transponder

4CAE91

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-IKC · BOEING 737 MAX 8

Hex
4CAE91
Octal
23127221
Decimal
5,025,425
Country
IE
Tail
EI-IKC
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
538
Distinct callsigns
20
Country
IE
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4CAE91.

Country allocation

The ICAO 24-bit address 4CAE91 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
RYR985X - 6 2026-07-06
RYR89XA - 6 2026-07-07
RYR87YR - 6 2026-07-12
RYR5TP - 6 2026-07-07
RYR3NG - 6 2026-07-06
RYR29XE Ryanair 5 2026-04-21
RYR9UA Ryanair 4 2026-04-17
RYR97ZH - 4 2026-06-17
RYR6CN Ryanair 4 2026-05-16
RYR6049 Ryanair 4 2026-07-13
RYR533D Ryanair 4 2026-06-17
RYR43JZ - 4 2026-07-12
RYR367 Ryanair 4 2026-06-07
RYR32UX - 4 2026-04-16
RYR272A Ryanair 4 2026-06-07
RYR25UK - 4 2026-07-12
RYR15ZZ - 4 2026-07-10
RYR9MP Ryanair 3 2026-06-10
RYR94GZ - 3 2026-07-11
RYR89DJ Ryanair 3 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RYR6049 OPO → FNC Jul 13, 23:25 UTCJul 13, 23:35 UTC10m
2026-07-13 RYR6049 OPO → FNC Jul 13, 21:50 UTCJul 13, 22:55 UTC1h 5m
2026-07-13 RYR12LF FNC → OPO Jul 13, 19:20 UTCJul 13, 20:50 UTC1h 30m
2026-07-13 RYR385 LIS → FNC Jul 13, 16:30 UTCJul 13, 17:55 UTC1h 25m
2026-07-13 RYR384 - Jul 13, 14:05 UTCJul 13, 15:25 UTC1h 20m
2026-07-13 RYR088 LIS → FNC Jul 13, 09:15 UTCJul 13, 10:40 UTC1h 25m
2026-07-13 RYR3WD - Jul 13, 07:01 UTCJul 13, 07:50 UTC50m
2026-07-12 RYR87YR - Jul 12, 18:10 UTCJul 12, 21:10 UTC3h 0m
2026-07-12 RYR43JZ - Jul 12, 09:15 UTCJul 12, 17:05 UTC7h 50m
2026-07-12 RYR25UK - Jul 12, 05:45 UTCJul 12, 08:05 UTC2h 20m
2026-07-11 RYR4QT EDI → FNC Jul 11, 18:35 UTCJul 11, 22:15 UTC3h 40m
2026-07-11 RYR6673 FNC → EDI Jul 11, 14:05 UTCJul 11, 17:40 UTC3h 35m
2026-07-11 RYR91EQ STN → FNC Jul 11, 09:25 UTCJul 11, 12:45 UTC3h 20m
2026-07-11 RYR94GZ FNC → STN Jul 11, 05:15 UTCJul 11, 08:25 UTC3h 10m
2026-07-10 RYR15ZZ - Jul 10, 21:05 UTCJul 10, 21:15 UTC10m
2026-07-10 RYR15ZZ - Jul 10, 17:55 UTCJul 10, 20:30 UTC2h 35m
2026-07-10 RYR4JL CHQ → DUB Jul 10, 12:45 UTCJul 10, 16:55 UTC4h 10m
2026-07-10 RYR86FK DUB → CHQ Jul 10, 07:45 UTCJul 10, 11:35 UTC3h 50m
2026-07-09 RYR1BY - Jul 9, 20:15 UTCJul 9, 22:15 UTC2h 0m
2026-07-09 RYR77EU DUB → REU Jul 9, 17:00 UTCJul 9, 19:20 UTC2h 20m
2026-07-09 RYR7901 - Jul 9, 15:15 UTCJul 9, 16:00 UTC45m
2026-07-09 RYR5151 - Jul 9, 13:30 UTCJul 9, 14:10 UTC40m
2026-07-09 RYR76JC - Jul 9, 11:40 UTCJul 9, 12:30 UTC50m
2026-07-09 RYR9HC DUB → STN Jul 9, 09:40 UTCJul 9, 10:30 UTC50m
2026-07-09 RYR58HP - Jul 9, 07:50 UTCJul 9, 08:45 UTC55m
2026-07-09 RYR2DC DUB → STN Jul 9, 06:00 UTCJul 9, 06:55 UTC55m
2026-07-08 RYR5243 - Jul 8, 19:35 UTCJul 8, 23:50 UTC4h 15m
2026-07-08 RYR3KL - Jul 8, 14:20 UTCJul 8, 18:15 UTC3h 55m
2026-07-08 RYR9583 - Jul 8, 10:05 UTCJul 8, 13:30 UTC3h 25m
2026-07-08 RYR9CT - Jul 8, 05:35 UTCJul 8, 08:15 UTC2h 40m
2026-07-07 RYR40ND - Jul 7, 20:45 UTCJul 7, 21:55 UTC1h 10m
2026-07-07 RYR50DA - Jul 7, 18:50 UTCJul 7, 20:00 UTC1h 10m
2026-07-07 RYR16YG LGW → DUB Jul 7, 17:15 UTCJul 7, 18:05 UTC50m
2026-07-07 RYR4JT - Jul 7, 15:05 UTCJul 7, 16:00 UTC55m
2026-07-07 RYR5TP - Jul 7, 10:05 UTCJul 7, 13:55 UTC3h 50m
2026-07-07 RYR89XA - Jul 7, 05:10 UTCJul 7, 08:55 UTC3h 45m
2026-07-06 RYR863 RZE → DUB Jul 6, 20:45 UTCJul 6, 23:35 UTC2h 50m
2026-07-06 RYR62EQ DUB → RZE Jul 6, 17:35 UTCJul 6, 19:55 UTC2h 20m
2026-07-06 RYR3NG - Jul 6, 12:50 UTCJul 6, 16:20 UTC3h 30m
2026-07-06 RYR985X - Jul 6, 07:40 UTCJul 6, 11:20 UTC3h 40m
2026-07-05 RYR99TH LIS → DUB Jul 5, 21:45 UTCJul 6, 00:00 UTC2h 15m
2026-07-05 RYR4XW - Jul 5, 18:20 UTCJul 5, 20:40 UTC2h 20m
2026-07-05 RYR6FH - Jul 5, 16:50 UTCJul 5, 17:30 UTC40m
2026-07-05 RYR69KF - Jul 5, 15:35 UTCJul 5, 16:05 UTC30m
2026-07-05 RYR3NG - Jul 5, 10:15 UTCJul 5, 14:05 UTC3h 50m
2026-07-05 RYR985X - Jul 5, 05:00 UTCJul 5, 08:40 UTC3h 40m
2026-07-04 RYR13KJ - Jul 4, 21:30 UTCJul 4, 22:10 UTC40m
2026-07-04 RYR2PX - Jul 4, 18:30 UTCJul 4, 20:45 UTC2h 15m
2026-07-04 RYR5YZ BRS → KRK Jul 4, 15:30 UTCJul 4, 17:35 UTC2h 5m
2026-07-04 RYR354T CWL → DUB Jul 4, 10:50 UTCJul 4, 14:15 UTC3h 25m

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

Mode-S 4CAE91 frequently asked

What is Mode-S code 4CAE91?
4CAE91 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-IKC.
Where is Mode-S 4CAE91 registered?
Mode-S code 4CAE91 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAE91 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAE91, octal 23127221, decimal 5,025,425.
What flights does 4CAE91 operate?
Mode-S 4CAE91 has broadcast 20 distinct callsigns, including RYR985X, RYR89XA, RYR87YR, RYR5TP, RYR3NG.