Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4CA1F9

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HRS · CESSNA 172 Skyhawk

Hex
4CA1F9
Octal
23120771
Decimal
5,022,201
Country
IE
Tail
EI-HRS
Type
C172
No current signal · last broadcast 3h ago
Flights observed
97
Distinct callsigns
1
Country
IE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4CA1F9.

Country allocation

The ICAO 24-bit address 4CA1F9 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 1 distinct

Callsign Airline Flights Last seen
AFZ51T - 96 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-20 AFZ51T - Jun 20, 13:19 UTCJun 20, 14:09 UTC50m
2026-06-20 AFZ51T - Jun 20, 10:29 UTCJun 20, 11:09 UTC40m
2026-06-17 AFZ51T - Jun 17, 14:20 UTCJun 17, 15:05 UTC45m
2026-06-17 AFZ51T - Jun 17, 13:15 UTCJun 17, 13:50 UTC35m
2026-06-17 AFZ51T - Jun 17, 10:25 UTCJun 17, 10:45 UTC20m
2026-06-17 AFZ51T - Jun 17, 08:50 UTCJun 17, 09:55 UTC1h 5m
2026-06-16 AFZ51T - Jun 16, 18:55 UTCJun 16, 19:30 UTC35m
2026-06-16 AFZ51T - Jun 16, 13:00 UTCJun 16, 13:44 UTC45m
2026-06-16 AFZ51T - Jun 16, 12:05 UTCJun 16, 12:25 UTC20m
2026-06-10 AFZ51T - Jun 10, 09:15 UTCJun 10, 09:35 UTC20m
2026-06-10 AFZ51T - Jun 10, 07:50 UTCJun 10, 08:35 UTC45m
2026-06-09 AFZ51T - Jun 9, 15:00 UTCJun 9, 15:35 UTC35m
2026-06-08 AFZ51T - Jun 8, 07:50 UTCJun 8, 11:55 UTC4h 5m
2026-05-31 AFZ51T - May 31, 13:30 UTCMay 31, 13:40 UTC10m
2026-05-29 AFZ51T - May 29, 16:40 UTCMay 29, 18:05 UTC1h 25m
2026-05-27 AFZ51T SNN → WAT May 27, 08:50 UTCMay 27, 10:40 UTC1h 50m
2026-05-27 AFZ51T - May 27, 07:10 UTCMay 27, 08:10 UTC1h 0m
2026-05-26 AFZ51T - May 26, 18:24 UTCMay 26, 18:40 UTC15m
2026-05-26 AFZ51T - May 26, 17:09 UTCMay 26, 17:44 UTC35m
2026-05-26 AFZ51T - May 26, 15:20 UTCMay 26, 15:45 UTC25m
2026-05-26 AFZ51T - May 26, 13:10 UTCMay 26, 14:14 UTC1h 5m
2026-05-26 AFZ51T - May 26, 12:05 UTCMay 26, 12:14 UTC10m
2026-05-26 AFZ51T WAT → WAT May 26, 10:44 UTCMay 26, 11:15 UTC30m
2026-05-26 AFZ51T - May 26, 09:09 UTCMay 26, 09:49 UTC40m
2026-05-26 AFZ51T - May 26, 07:29 UTCMay 26, 07:45 UTC15m
2026-05-25 AFZ51T WAT → WAT May 25, 18:35 UTCMay 25, 19:44 UTC1h 9m
2026-05-25 AFZ51T - May 25, 15:00 UTCMay 25, 16:30 UTC1h 30m
2026-05-25 AFZ51T - May 25, 14:00 UTCMay 25, 14:15 UTC15m
2026-05-25 AFZ51T WAT → WAT May 25, 11:15 UTCMay 25, 13:00 UTC1h 45m
2026-05-25 AFZ51T - May 25, 09:20 UTCMay 25, 10:05 UTC45m
2026-05-25 AFZ51T - May 25, 08:20 UTCMay 25, 08:35 UTC15m
2026-05-25 AFZ51T - May 25, 07:35 UTCMay 25, 07:45 UTC10m
2026-05-24 AFZ51T WAT → WAT May 24, 18:40 UTCMay 24, 19:40 UTC1h 0m
2026-05-24 AFZ51T - May 24, 16:40 UTCMay 24, 17:25 UTC45m
2026-05-24 AFZ51T - May 24, 14:15 UTCMay 24, 15:35 UTC1h 20m
2026-05-24 AFZ51T - May 24, 13:20 UTCMay 24, 13:30 UTC10m
2026-05-24 AFZ51T - May 24, 10:40 UTCMay 24, 11:55 UTC1h 15m
2026-05-24 AFZ51T - May 24, 08:50 UTCMay 24, 10:10 UTC1h 20m
2026-05-23 AFZ51T - May 23, 16:40 UTCMay 23, 17:00 UTC20m
2026-05-23 AFZ51T - May 23, 14:35 UTCMay 23, 15:05 UTC30m
2026-05-23 AFZ51T WAT → WAT May 23, 10:50 UTCMay 23, 14:00 UTC3h 10m
2026-05-23 AFZ51T WAT → WAT May 23, 08:30 UTCMay 23, 09:35 UTC1h 5m
2026-05-18 AFZ51T - May 18, 08:15 UTCMay 18, 09:05 UTC50m
2026-05-16 AFZ51T - May 16, 19:05 UTCMay 16, 19:40 UTC35m
2026-05-16 AFZ51T - May 16, 15:10 UTCMay 16, 15:50 UTC40m
2026-05-16 AFZ51T - May 16, 13:51 UTCMay 16, 14:31 UTC40m
2026-05-15 AFZ51T ORK → ORK May 15, 17:15 UTCMay 15, 18:05 UTC50m
2026-05-15 AFZ51T ORK → ORK May 15, 15:35 UTCMay 15, 16:15 UTC40m
2026-05-15 AFZ51T ORK → ORK May 15, 14:00 UTCMay 15, 14:40 UTC40m
2026-05-15 AFZ51T - May 15, 12:15 UTCMay 15, 13:10 UTC55m

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

Mode-S 4CA1F9 frequently asked

What is Mode-S code 4CA1F9?
4CA1F9 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HRS.
Where is Mode-S 4CA1F9 registered?
Mode-S code 4CA1F9 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA1F9 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA1F9, octal 23120771, decimal 5,022,201.
What flights does 4CA1F9 operate?
Mode-S 4CA1F9 has broadcast 1 distinct callsign, including AFZ51T.