sensors Mode-S transponder

4CADC9

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HJR · AIRBUS A-330-900

Hex
4CADC9
Octal
23126711
Decimal
5,025,225
Country
IE
Tail
EI-HJR
Type
A339
Broadcasting now · callsign ITY621 · 35,000 ft
Flights observed
10
Distinct callsigns
3
Country
IE
Last broadcast
12h ago

Current position

4CADC9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CADC9 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 3 distinct

Callsign Airline Flights Last seen
ITY759 ITA Airways 7 2026-04-13
ITY620 ITA Airways 2 2026-04-14
ITY758 - 1 2026-04-12

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-14 ITY620 FCO → LAX Apr 14, 09:10 UTCApr 14, 10:50 UTC1h 40m
2026-04-14 ITY620 FCO → LAX Apr 14, 07:50 UTCApr 14, 09:05 UTC1h 15m
2026-04-13 ITY759 BKK → FCO Apr 13, 16:15 UTCApr 13, 17:35 UTC1h 20m
2026-04-13 ITY759 BKK → FCO Apr 13, 15:50 UTCApr 13, 17:35 UTC1h 45m
2026-04-13 ITY759 BKK → FCO Apr 13, 13:45 UTCApr 13, 16:15 UTC2h 30m
2026-04-13 ITY759 BKK → FCO Apr 13, 08:20 UTCApr 13, 10:10 UTC1h 50m
2026-04-13 ITY759 BKK → FCO Apr 13, 07:55 UTCApr 13, 10:10 UTC2h 15m
2026-04-13 ITY759 BKK → FCO Apr 13, 07:15 UTCApr 13, 08:15 UTC1h 0m
2026-04-13 ITY759 BKK → FCO Apr 13, 05:50 UTCApr 13, 06:00 UTC11m
2026-04-12 ITY758 - Apr 12, 23:55 UTCApr 13, 00:10 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-HJR page for operator, model, and routing details .

Mode-S 4CADC9 frequently asked

What is Mode-S code 4CADC9?
4CADC9 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HJR.
Where is Mode-S 4CADC9 registered?
Mode-S code 4CADC9 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CADC9 broadcasting right now?
Yes. Mode-S 4CADC9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CADC9, octal 23126711, decimal 5,025,225.
What flights does 4CADC9 operate?
Mode-S 4CADC9 has broadcast 3 distinct callsigns, including ITY759, ITY620, ITY758.