Apparatus

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sensors Mode-S transponder

4CAEC9

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-KFF · AIRBUS A-320

Hex
4CAEC9
Octal
23127311
Decimal
5,025,481
Country
IE
Tail
EI-KFF
Type
A320
No current signal · last broadcast 6d ago
Flights observed
86
Distinct callsigns
20
Country
IE
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S 4CAEC9.

Country allocation

The ICAO 24-bit address 4CAEC9 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
AYN7352 - 8 2026-07-21
AYN7351 - 8 2026-07-21
AYN7372 - 5 2026-07-24
AYN7371 - 5 2026-07-08
AYN7994 - 4 2026-07-05
AYN7906 - 4 2026-07-20
AYN7905 - 4 2026-07-19
AYN7875 - 4 2026-07-04
AYN7993 - 3 2026-06-30
AYN7962 - 3 2026-07-23
AYN7819 - 3 2026-07-03
AYN7342 - 3 2026-05-19
AYN7876 - 2 2026-07-04
AYN7606 - 2 2026-06-29
AYN7605 - 2 2026-06-29
AYN7353 - 2 2026-07-25
AYN7341 - 2 2026-05-19
AYN7142 - 2 2026-05-05
AYN7078 - 2 2026-05-21
AYN7077 - 2 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 AYN7354 - Jul 25, 02:05 UTCJul 25, 02:25 UTC20m
2026-07-25 AYN7353 - Jul 25, 00:55 UTCJul 25, 01:15 UTC20m
2026-07-24 AYN7372 - Jul 24, 14:00 UTCJul 24, 14:30 UTC30m
2026-07-23 AYN7962 - Jul 23, 20:25 UTCJul 24, 12:55 UTC16h 30m
2026-07-23 AYN7962 - Jul 23, 16:20 UTCJul 24, 12:55 UTC20h 35m
2026-07-23 AYN7962 - Jul 23, 16:10 UTCJul 24, 12:55 UTC20h 45m
2026-07-23 AYN7952 - Jul 23, 08:50 UTCJul 23, 20:45 UTC11h 55m
2026-07-23 AYN7951 - Jul 23, 05:20 UTCJul 23, 07:40 UTC2h 20m
2026-07-21 AYN7352 - Jul 21, 11:30 UTCJul 21, 11:45 UTC15m
2026-07-21 AYN7351 - Jul 21, 10:25 UTCJul 21, 10:40 UTC15m
2026-07-20 AYN7906 - Jul 20, 08:20 UTCJul 20, 09:00 UTC40m
2026-07-19 AYN7905 PLX → KUT Jul 19, 18:45 UTCJul 20, 07:10 UTC12h 25m
2026-07-19 AYN7353 - Jul 19, 17:40 UTCJul 19, 18:00 UTC20m
2026-07-12 AYN7352 - Jul 12, 11:30 UTCJul 12, 11:50 UTC20m
2026-07-12 AYN7351 - Jul 12, 10:15 UTCJul 12, 10:35 UTC20m
2026-07-09 AYN7352 - Jul 9, 11:20 UTCJul 9, 11:40 UTC20m
2026-07-09 AYN7351 - Jul 9, 10:15 UTCJul 9, 10:30 UTC15m
2026-07-08 AYN7372 - Jul 8, 13:45 UTCJul 8, 14:10 UTC25m
2026-07-08 AYN7371 - Jul 8, 12:15 UTCJul 8, 12:40 UTC25m
2026-07-05 AYN7994 - Jul 5, 08:50 UTCJul 5, 09:30 UTC40m
2026-07-04 AYN7994 KUT → KUT Jul 4, 15:20 UTCJul 5, 07:50 UTC16h 30m
2026-07-04 AYN7876 - Jul 4, 08:20 UTCJul 4, 14:20 UTC6h 0m
2026-07-04 AYN7875 - Jul 4, 06:45 UTCJul 4, 07:10 UTC25m
2026-07-03 AYN7875 - Jul 3, 10:20 UTCJul 4, 06:00 UTC19h 40m
2026-07-03 AYN7820 - Jul 3, 10:00 UTCJul 4, 06:00 UTC20h 0m
2026-07-03 AYN7819 - Jul 3, 08:15 UTCJul 3, 08:35 UTC20m
2026-07-03 AYN7819 - Jul 3, 06:10 UTCJul 3, 07:35 UTC1h 25m
2026-07-02 AYN7819 - Jul 2, 08:20 UTCJul 3, 07:35 UTC23h 15m
2026-07-02 AYN7876 - Jul 2, 08:10 UTCJul 3, 06:15 UTC22h 5m
2026-07-02 AYN7875 - Jul 2, 06:15 UTCJul 2, 06:51 UTC36m
2026-07-02 AYN7875 - Jul 2, 04:15 UTCJul 2, 05:30 UTC1h 15m
2026-06-30 AYN7994 - Jun 30, 12:35 UTCJun 30, 13:20 UTC45m
2026-06-30 AYN7993 - Jun 30, 10:45 UTCJun 30, 11:35 UTC50m
2026-06-29 AYN7606 - Jun 29, 10:24 UTCJun 29, 11:04 UTC40m
2026-06-29 AYN7605 - Jun 29, 08:24 UTCJun 29, 09:25 UTC1h 0m
2026-06-24 AYN7154 - Jun 24, 12:54 UTCJun 24, 13:20 UTC25m
2026-06-24 AYN7153 - Jun 24, 11:45 UTCJun 24, 12:09 UTC25m
2026-06-18 AYN7372 - Jun 18, 15:30 UTCJun 18, 16:00 UTC30m
2026-06-18 AYN7371 - Jun 18, 13:50 UTCJun 18, 14:10 UTC20m
2026-06-17 AYN7906 - Jun 17, 07:25 UTCJun 17, 08:05 UTC40m
2026-06-17 AYN7905 - Jun 17, 04:50 UTCJun 17, 05:40 UTC50m
2026-06-15 AYN7906 - Jun 15, 08:15 UTCJun 15, 09:00 UTC45m
2026-06-15 AYN7905 - Jun 15, 06:24 UTCJun 15, 07:05 UTC40m
2026-06-13 AYN7475 - Jun 13, 07:35 UTCJun 13, 14:15 UTC6h 40m
2026-06-11 AYN7176 - Jun 11, 18:50 UTCJun 11, 19:05 UTC15m
2026-06-11 AYN7275 - Jun 11, 16:45 UTCJun 11, 17:15 UTC30m
2026-06-11 AYN7994 - Jun 11, 13:50 UTCJun 11, 15:10 UTC1h 20m
2026-06-11 AYN7993 - Jun 11, 12:25 UTCJun 11, 12:45 UTC20m
2026-06-11 AYN7993 - Jun 11, 11:05 UTCJun 11, 11:35 UTC30m
2026-06-11 AYN7276 - Jun 11, 09:10 UTCJun 11, 09:25 UTC15m

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

Mode-S 4CAEC9 frequently asked

What is Mode-S code 4CAEC9?
4CAEC9 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KFF.
Where is Mode-S 4CAEC9 registered?
Mode-S code 4CAEC9 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAEC9 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAEC9, octal 23127311, decimal 5,025,481.
What flights does 4CAEC9 operate?
Mode-S 4CAEC9 has broadcast 20 distinct callsigns, including AYN7352, AYN7351, AYN7372, AYN7371, AYN7994.