Apparatus

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sensors Mode-S transponder

4CAF1B

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-KFI · AIRBUS A-320neo

Hex
4CAF1B
Octal
23127433
Decimal
5,025,563
Country
IE
Tail
EI-KFI
Type
A20N
No current signal · last broadcast 29d ago
Flights observed
78
Distinct callsigns
20
Country
IE
Last broadcast
29d ago

Last known position

Most recent position reported by Mode-S 4CAF1B.

Country allocation

The ICAO 24-bit address 4CAF1B 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
AYN7475 - 7 2026-07-09
AYN7111 - 7 2026-06-27
AYN7077 - 7 2026-07-22
AYN7817 - 6 2026-07-10
AYN7078 - 6 2026-07-23
AYN7476 - 5 2026-07-02
AYN7818 - 4 2026-07-10
AYN7112 - 4 2026-06-27
AYN7951 - 3 2026-05-25
AYN7819 - 3 2026-07-01
AYN7173 - 3 2026-07-19
AYN7153 - 3 2026-07-22
AYN7952 - 2 2026-05-25
AYN7820 - 2 2026-07-01
AYN7605 - 2 2026-07-08
AYN7993 - 1 2026-06-02
AYN7906 - 1 2026-05-23
AYN7905 - 1 2026-05-23
AYN7730 - 1 2026-07-11
AYN7676 - 1 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 AYN7078 - Jul 23, 06:45 UTCJul 23, 07:25 UTC40m
2026-07-22 AYN7077 PLX → KUT Jul 22, 13:15 UTCJul 23, 05:40 UTC16h 25m
2026-07-22 AYN7153 - Jul 22, 12:05 UTCJul 22, 12:25 UTC20m
2026-07-20 AYN7078 - Jul 20, 10:50 UTCJul 20, 11:30 UTC40m
2026-07-20 AYN7077 - Jul 20, 08:55 UTCJul 20, 09:45 UTC50m
2026-07-19 AYN7077 - Jul 19, 14:15 UTCJul 20, 09:45 UTC19h 30m
2026-07-19 AYN7153 - Jul 19, 08:20 UTCJul 19, 13:30 UTC5h 10m
2026-07-19 AYN7173 - Jul 19, 06:50 UTCJul 19, 07:15 UTC25m
2026-07-18 AYN7173 - Jul 18, 10:50 UTCJul 19, 07:15 UTC20h 25m
2026-07-18 AYN7078 - Jul 18, 10:15 UTCJul 19, 07:15 UTC21h 0m
2026-07-18 AYN7077 - Jul 18, 08:15 UTCJul 18, 09:05 UTC50m
2026-07-16 AYN7078 - Jul 16, 06:40 UTCJul 16, 07:25 UTC45m
2026-07-16 AYN7077 - Jul 16, 04:55 UTCJul 16, 05:45 UTC50m
2026-07-14 AYN7172 - Jul 14, 05:40 UTCJul 14, 06:10 UTC30m
2026-07-13 AYN7154 - Jul 13, 16:20 UTCJul 14, 04:40 UTC12h 20m
2026-07-13 AYN7153 - Jul 13, 15:00 UTCJul 13, 15:30 UTC30m
2026-07-11 AYN7730 - Jul 11, 08:30 UTCJul 11, 09:20 UTC50m
2026-07-10 AYN7818 - Jul 10, 10:10 UTCJul 10, 12:00 UTC1h 50m
2026-07-10 AYN7817 - Jul 10, 06:10 UTCJul 10, 08:50 UTC2h 40m
2026-07-09 AYN7817 - Jul 9, 10:50 UTCJul 10, 08:50 UTC22h 0m
2026-07-09 AYN7817 - Jul 9, 10:30 UTCJul 10, 08:45 UTC22h 15m
2026-07-09 AYN7475 - Jul 9, 06:55 UTCJul 9, 09:10 UTC2h 15m
2026-07-08 AYN7475 - Jul 8, 09:20 UTCJul 9, 08:45 UTC23h 25m
2026-07-08 AYN7605 - Jul 8, 08:05 UTCJul 8, 08:20 UTC15m
2026-07-07 AYN7662 - Jul 7, 18:05 UTCJul 7, 22:30 UTC4h 25m
2026-07-06 AYN7818 - Jul 6, 09:20 UTCJul 6, 11:10 UTC1h 50m
2026-07-06 AYN7817 - Jul 6, 05:40 UTCJul 6, 08:05 UTC2h 25m
2026-07-02 AYN7476 - Jul 2, 10:35 UTCJul 2, 12:25 UTC1h 50m
2026-07-02 AYN7475 - Jul 2, 06:55 UTCJul 2, 09:25 UTC2h 30m
2026-07-01 AYN7475 - Jul 1, 10:50 UTCJul 2, 09:25 UTC22h 35m
2026-07-01 AYN7820 - Jul 1, 09:20 UTCJul 2, 08:20 UTC23h 0m
2026-07-01 AYN7819 - Jul 1, 05:35 UTCJul 1, 08:00 UTC2h 25m
2026-06-27 AYN7112 - Jun 27, 12:09 UTCJun 27, 13:55 UTC1h 45m
2026-06-27 AYN7111 - Jun 27, 10:25 UTCJun 27, 10:50 UTC25m
2026-06-27 AYN7111 - Jun 27, 08:20 UTCJun 27, 09:44 UTC1h 25m
2026-06-22 AYN7176 - Jun 22, 19:24 UTCJun 22, 19:34 UTC10m
2026-06-22 AYN7078 - Jun 22, 10:00 UTCJun 22, 10:40 UTC40m
2026-06-22 AYN7077 - Jun 22, 08:15 UTCJun 22, 09:04 UTC50m
2026-06-21 AYN7174 - Jun 21, 08:15 UTCJun 21, 08:40 UTC25m
2026-06-21 AYN7173 - Jun 21, 06:55 UTCJun 21, 07:14 UTC20m
2026-06-17 AYN7112 - Jun 17, 12:05 UTCJun 17, 13:45 UTC1h 40m
2026-06-17 AYN7111 - Jun 17, 10:10 UTCJun 17, 10:25 UTC15m
2026-06-17 AYN7111 - Jun 17, 08:10 UTCJun 17, 09:35 UTC1h 25m
2026-06-16 AYN7111 - Jun 16, 08:49 UTCJun 17, 08:45 UTC23h 56m
2026-06-16 AYN7152 - Jun 16, 08:35 UTCJun 16, 09:00 UTC25m
2026-06-16 AYN7151 - Jun 16, 07:25 UTCJun 16, 07:50 UTC25m
2026-06-13 AYN7112 - Jun 13, 12:00 UTCJun 13, 13:45 UTC1h 45m
2026-06-13 AYN7111 - Jun 13, 08:20 UTCJun 13, 10:30 UTC2h 10m
2026-06-08 AYN7818 - Jun 8, 09:20 UTCJun 8, 12:10 UTC2h 50m
2026-06-07 AYN7817 - Jun 7, 13:50 UTCJun 8, 08:00 UTC18h 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-KFI page for operator, model, and routing details .

Mode-S 4CAF1B frequently asked

What is Mode-S code 4CAF1B?
4CAF1B is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KFI.
Where is Mode-S 4CAF1B registered?
Mode-S code 4CAF1B is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAF1B broadcasting right now?
No active broadcast right now. Last signal was 29d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAF1B, octal 23127433, decimal 5,025,563.
What flights does 4CAF1B operate?
Mode-S 4CAF1B has broadcast 20 distinct callsigns, including AYN7475, AYN7111, AYN7077, AYN7817, AYN7078.