Apparatus

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sensors Mode-S transponder

4CA781

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-LID · AGUSTA AW-169

Hex
4CA781
Octal
23123601
Decimal
5,023,617
Country
IE
Tail
EI-LID
Type
A169
No current signal · last broadcast 12h ago
Flights observed
113
Distinct callsigns
1
Country
IE
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 4CA781.

Country allocation

The ICAO 24-bit address 4CA781 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
HEMS - 113 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 HEMS - Jul 11, 15:50 UTCJul 11, 16:00 UTC10m
2026-07-11 HEMS - Jul 11, 09:55 UTCJul 11, 10:15 UTC20m
2026-07-11 HEMS - Jul 11, 07:20 UTCJul 11, 07:30 UTC10m
2026-07-10 HEMS - Jul 10, 21:20 UTCJul 10, 21:30 UTC10m
2026-07-10 HEMS - Jul 10, 17:15 UTCJul 10, 17:30 UTC15m
2026-07-10 HEMS - Jul 10, 10:20 UTCJul 10, 10:30 UTC10m
2026-07-09 HEMS - Jul 9, 05:20 UTCJul 9, 05:30 UTC10m
2026-07-09 HEMS - Jul 9, 04:15 UTCJul 9, 04:25 UTC10m
2026-07-08 HEMS - Jul 8, 23:40 UTCJul 9, 00:50 UTC1h 10m
2026-07-08 HEMS - Jul 8, 19:25 UTCJul 8, 20:00 UTC35m
2026-07-08 HEMS - Jul 8, 18:30 UTCJul 8, 19:00 UTC30m
2026-07-08 HEMS - Jul 8, 16:10 UTCJul 8, 16:20 UTC10m
2026-07-08 HEMS - Jul 8, 07:25 UTCJul 8, 07:35 UTC10m
2026-07-06 HEMS - Jul 6, 23:55 UTCJul 7, 00:05 UTC10m
2026-07-06 HEMS - Jul 6, 21:30 UTCJul 6, 21:50 UTC20m
2026-07-06 HEMS - Jul 6, 19:05 UTCJul 6, 20:05 UTC1h 0m
2026-07-05 HEMS - Jul 5, 14:05 UTCJul 5, 14:15 UTC10m
2026-07-04 HEMS - Jul 4, 22:15 UTCJul 4, 22:30 UTC15m
2026-07-04 HEMS - Jul 4, 20:55 UTCJul 4, 21:05 UTC10m
2026-07-04 HEMS - Jul 4, 13:30 UTCJul 4, 13:40 UTC10m
2026-07-04 HEMS - Jul 4, 10:40 UTCJul 4, 11:05 UTC25m
2026-07-04 HEMS - Jul 4, 10:00 UTCJul 4, 10:10 UTC10m
2026-07-03 HEMS - Jul 3, 22:35 UTCJul 3, 22:55 UTC20m
2026-07-03 HEMS - Jul 3, 20:45 UTCJul 3, 21:05 UTC20m
2026-07-02 HEMS - Jul 2, 20:20 UTCJul 2, 20:50 UTC30m
2026-07-01 HEMS - Jul 1, 13:10 UTCJul 1, 13:20 UTC10m
2026-07-01 HEMS - Jul 1, 11:55 UTCJul 1, 12:10 UTC15m
2026-06-30 HEMS - Jun 30, 21:10 UTCJun 30, 21:20 UTC10m
2026-06-30 HEMS - Jun 30, 03:45 UTCJun 30, 04:10 UTC25m
2026-06-29 HEMS - Jun 29, 16:35 UTCJun 29, 17:45 UTC1h 10m
2026-06-29 HEMS - Jun 29, 13:39 UTCJun 29, 13:49 UTC10m
2026-06-29 HEMS - Jun 29, 09:20 UTCJun 29, 09:34 UTC15m
2026-06-29 HEMS - Jun 29, 07:55 UTCJun 29, 08:04 UTC10m
2026-06-29 HEMS - Jun 29, 04:45 UTCJun 29, 05:00 UTC15m
2026-06-29 HEMS - Jun 29, 03:54 UTCJun 29, 04:09 UTC15m
2026-06-29 HEMS - Jun 29, 01:34 UTCJun 29, 01:44 UTC10m
2026-06-29 HEMS - Jun 29, 00:29 UTCJun 29, 00:39 UTC10m
2026-06-28 HEMS - Jun 28, 21:04 UTCJun 28, 21:14 UTC10m
2026-06-28 HEMS - Jun 28, 13:10 UTCJun 28, 13:19 UTC10m
2026-06-27 HEMS - Jun 27, 19:55 UTCJun 27, 20:44 UTC50m
2026-06-27 HEMS - Jun 27, 11:00 UTCJun 27, 11:09 UTC10m
2026-06-27 HEMS - Jun 27, 10:00 UTCJun 27, 10:14 UTC15m
2026-06-26 HEMS - Jun 26, 19:14 UTCJun 26, 19:35 UTC20m
2026-06-26 HEMS - Jun 26, 15:54 UTCJun 26, 16:05 UTC10m
2026-06-26 HEMS - Jun 26, 07:35 UTCJun 26, 08:00 UTC25m
2026-06-26 HEMS - Jun 26, 06:35 UTCJun 26, 06:54 UTC20m
2026-06-26 HEMS - Jun 26, 03:45 UTCJun 26, 03:50 UTC5m
2026-06-25 HEMS - Jun 25, 16:20 UTCJun 25, 17:30 UTC1h 10m
2026-06-23 HEMS - Jun 23, 18:25 UTCJun 23, 18:34 UTC10m
2026-06-23 HEMS - Jun 23, 16:54 UTCJun 23, 17:44 UTC50m

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

Mode-S 4CA781 frequently asked

What is Mode-S code 4CA781?
4CA781 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-LID.
Where is Mode-S 4CA781 registered?
Mode-S code 4CA781 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA781 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA781, octal 23123601, decimal 5,023,617.
What flights does 4CA781 operate?
Mode-S 4CA781 has broadcast 1 distinct callsign, including HEMS.