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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 Jul 26, 18:45 UTC
Flights observed
148
Distinct callsigns
3
Country
IE
Last broadcast
Jul 26, 18:45 UTC

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 3 distinct

Callsign Airline Flights Last seen
HEMS - 129 2026-07-18
LID641 - 17 2026-07-26
LID701 - 2 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 LID641 - Jul 26, 18:35 UTCJul 26, 18:40 UTC5m
2026-07-26 LID641 - Jul 26, 17:05 UTCJul 26, 17:15 UTC10m
2026-07-26 LID641 - Jul 26, 10:15 UTCJul 26, 10:35 UTC20m
2026-07-24 LID641 - Jul 24, 23:20 UTCJul 24, 23:30 UTC10m
2026-07-24 LID641 - Jul 24, 21:30 UTCJul 24, 21:45 UTC15m
2026-07-24 LID641 - Jul 24, 17:05 UTCJul 24, 17:25 UTC20m
2026-07-24 LID641 - Jul 24, 15:35 UTCJul 24, 16:25 UTC50m
2026-07-24 LID641 - Jul 24, 12:45 UTCJul 24, 13:15 UTC30m
2026-07-23 LID641 - Jul 23, 17:10 UTCJul 23, 17:25 UTC15m
2026-07-23 LID641 - Jul 23, 16:25 UTCJul 23, 16:40 UTC15m
2026-07-23 LID641 - Jul 23, 09:35 UTCJul 23, 10:15 UTC40m
2026-07-21 LID641 - Jul 21, 09:20 UTCJul 21, 09:30 UTC10m
2026-07-21 LID641 - Jul 21, 08:10 UTCJul 21, 08:20 UTC10m
2026-07-21 LID641 - Jul 21, 05:45 UTCJul 21, 06:00 UTC15m
2026-07-21 LID641 - Jul 21, 03:35 UTCJul 21, 04:15 UTC40m
2026-07-20 LID641 - Jul 20, 23:30 UTCJul 21, 00:50 UTC1h 19m
2026-07-20 LID641 - Jul 20, 22:40 UTCJul 20, 22:50 UTC10m
2026-07-20 LID701 - Jul 20, 16:10 UTCJul 20, 16:30 UTC20m
2026-07-20 LID701 - Jul 20, 14:35 UTCJul 20, 15:05 UTC30m
2026-07-18 HEMS - Jul 18, 19:25 UTCJul 18, 19:45 UTC20m
2026-07-18 HEMS - Jul 18, 18:00 UTCJul 18, 18:20 UTC20m
2026-07-18 HEMS - Jul 18, 15:45 UTCJul 18, 15:55 UTC10m
2026-07-18 HEMS - Jul 18, 14:05 UTCJul 18, 14:30 UTC25m
2026-07-17 HEMS - Jul 17, 15:05 UTCJul 17, 15:44 UTC40m
2026-07-17 HEMS - Jul 17, 05:20 UTCJul 17, 05:35 UTC15m
2026-07-17 HEMS - Jul 17, 04:14 UTCJul 17, 04:25 UTC10m
2026-07-17 HEMS - Jul 17, 02:25 UTCJul 17, 02:45 UTC20m
2026-07-16 HEMS - Jul 16, 03:40 UTCJul 16, 03:50 UTC10m
2026-07-16 HEMS - Jul 16, 02:05 UTCJul 16, 02:15 UTC10m
2026-07-15 HEMS - Jul 15, 08:00 UTCJul 15, 08:10 UTC10m
2026-07-14 HEMS - Jul 14, 19:25 UTCJul 14, 20:00 UTC35m
2026-07-14 HEMS - Jul 14, 16:30 UTCJul 14, 17:35 UTC1h 5m
2026-07-14 HEMS - Jul 14, 09:55 UTCJul 14, 10:05 UTC10m
2026-07-14 HEMS - Jul 14, 08:00 UTCJul 14, 08:10 UTC10m
2026-07-12 HEMS - Jul 12, 06:40 UTCJul 12, 07:05 UTC25m
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

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 Jul 26, 18:45 UTC.
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 3 distinct callsigns, including HEMS, LID641, LID701.