Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4CAA54

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GPO · ATR-72-600

Hex
4CAA54
Octal
23125124
Decimal
5,024,340
Country
IE
Tail
EI-GPO
Type
AT76
No current signal · last broadcast Jul 26, 21:20 UTC
Flights observed
781
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S 4CAA54.

Country allocation

The ICAO 24-bit address 4CAA54 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
EAI41D - 23 2026-07-20
EAI54VJ Elite Air 21 2026-07-20
EAI23C - 20 2026-07-22
EAI55SK - 19 2026-07-20
EAI48D Elite Air 17 2026-07-19
EAI43D - 17 2026-07-19
EAI31F - 17 2026-07-19
EAI22MW - 16 2026-07-08
EAI17N Elite Air 16 2026-07-19
EAI16M Elite Air 16 2026-07-19
EAI42D Elite Air 15 2026-07-17
EAI3HP Elite Air 15 2026-07-19
EAI21HA - 15 2026-07-08
EAI75B - 14 2026-07-20
EAI74G Elite Air 14 2026-07-20
EAI33S Elite Air 13 2026-07-25
EAI2GL - 13 2026-07-08
EAI8C Elite Air 12 2026-07-26
EAI84U Elite Air 12 2026-07-20
EAI09U Elite Air 12 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EAI09U SOU → DUB Jul 26, 19:50 UTCJul 26, 21:15 UTC1h 25m
2026-07-26 EAI8C DUB → SOU Jul 26, 17:55 UTCJul 26, 19:05 UTC1h 10m
2026-07-26 EAI89W NCL → DUB Jul 26, 16:00 UTCJul 26, 17:00 UTC1h 0m
2026-07-26 EAI79D DUB → NCL Jul 26, 13:45 UTCJul 26, 14:50 UTC1h 5m
2026-07-26 EAI81A BRS → DUB Jul 26, 07:45 UTCJul 26, 08:50 UTC1h 5m
2026-07-26 EAI8BR DUB → BRS Jul 26, 05:55 UTCJul 26, 06:45 UTC51m
2026-07-25 EAI29GA GLA → DUB Jul 25, 20:25 UTCJul 25, 21:10 UTC45m
2026-07-25 EAI28QB DUB → GLA Jul 25, 18:30 UTCJul 25, 19:25 UTC55m
2026-07-25 EAI31Q EXT → DUB Jul 25, 16:35 UTCJul 25, 17:35 UTC1h 0m
2026-07-25 EAI33S DUB → EXT Jul 25, 14:55 UTCJul 25, 15:50 UTC55m
2026-07-25 EAI33S DUB → EXT Jul 25, 14:40 UTCJul 25, 14:45 UTC5m
2026-07-25 EAI55YA EDI → DUB Jul 25, 12:45 UTCJul 25, 13:50 UTC1h 5m
2026-07-25 EAI4WD DUB → NCL Jul 25, 11:00 UTCJul 25, 11:55 UTC55m
2026-07-25 EAI34N ABZ → DUB Jul 25, 08:50 UTCJul 25, 10:10 UTC1h 20m
2026-07-25 EAI42A DUB → ABZ Jul 25, 07:00 UTCJul 25, 08:10 UTC1h 10m
2026-07-24 EAI46Z LPL → DUB Jul 24, 20:15 UTCJul 24, 20:55 UTC40m
2026-07-24 EAI36W - Jul 24, 18:35 UTCJul 24, 19:20 UTC45m
2026-07-24 EAI2A SOU → DUB Jul 24, 16:40 UTCJul 24, 18:00 UTC1h 20m
2026-07-24 EAI4HS - Jul 24, 14:35 UTCJul 24, 15:50 UTC1h 15m
2026-07-24 EAI2DM GLA → DUB Jul 24, 12:30 UTCJul 24, 13:25 UTC55m
2026-07-24 EAI26K - Jul 24, 11:00 UTCJul 24, 11:50 UTC50m
2026-07-24 EAI31M SOU → DUB Jul 24, 08:35 UTCJul 24, 09:50 UTC1h 15m
2026-07-24 EAI7S DUB → SOU Jul 24, 06:35 UTCJul 24, 07:55 UTC1h 20m
2026-07-22 EAI31Q EXT → DUB Jul 22, 14:55 UTCJul 22, 16:05 UTC1h 10m
2026-07-22 EAI33S DUB → EXT Jul 22, 13:20 UTCJul 22, 14:05 UTC45m
2026-07-22 EAI23C - Jul 22, 11:10 UTCJul 22, 11:55 UTC45m
2026-07-21 EAI09U SOU → DUB Jul 21, 19:00 UTCJul 21, 20:15 UTC1h 15m
2026-07-21 EAI8C DUB → SOU Jul 21, 17:10 UTCJul 21, 18:20 UTC1h 10m
2026-07-21 EAI25LG GLA → DUB Jul 21, 15:05 UTCJul 21, 15:55 UTC50m
2026-07-21 EAI24CE DUB → GLA Jul 21, 13:30 UTCJul 21, 14:20 UTC50m
2026-07-21 EAI38D MAN → DUB Jul 21, 11:35 UTCJul 21, 12:20 UTC45m
2026-07-21 EAI69M - Jul 21, 09:50 UTCJul 21, 10:35 UTC45m
2026-07-21 EAI91M LBA → DUB Jul 21, 08:05 UTCJul 21, 08:55 UTC50m
2026-07-21 EAI9L DUB → LBA Jul 21, 06:15 UTCJul 21, 07:05 UTC50m
2026-07-20 EAI75B - Jul 20, 18:00 UTCJul 20, 18:55 UTC55m
2026-07-20 EAI74G DUB → BHX Jul 20, 16:20 UTCJul 20, 17:15 UTC55m
2026-07-20 EAI85Y BRS → BRS Jul 20, 14:20 UTCJul 20, 15:15 UTC55m
2026-07-20 EAI84U DUB → BRS Jul 20, 12:25 UTCJul 20, 13:20 UTC55m
2026-07-20 EAI55SK EDI → DUB Jul 20, 10:40 UTCJul 20, 11:30 UTC50m
2026-07-20 EAI54VJ DUB → EDI Jul 20, 08:40 UTCJul 20, 09:45 UTC1h 5m
2026-07-20 EAI41D - Jul 20, 07:05 UTCJul 20, 07:45 UTC40m
2026-07-19 EAI48D DUB → CFN Jul 19, 17:55 UTCJul 19, 18:35 UTC40m
2026-07-19 EAI17N IOM → DUB Jul 19, 16:25 UTCJul 19, 16:55 UTC30m
2026-07-19 EAI16M DUB → IOM Jul 19, 15:20 UTCJul 19, 15:40 UTC20m
2026-07-19 EAI43D - Jul 19, 13:50 UTCJul 19, 14:30 UTC40m
2026-07-19 EAI41D - Jul 19, 12:35 UTCJul 19, 13:10 UTC35m
2026-07-19 EAI31F - Jul 19, 09:00 UTCJul 19, 10:10 UTC1h 10m
2026-07-19 EAI3HP DUB → EDI Jul 19, 07:15 UTCJul 19, 08:10 UTC55m
2026-07-18 EAI57K EDI → DUB Jul 18, 14:50 UTCJul 18, 15:45 UTC55m
2026-07-18 EAI3256 DUB → EDI Jul 18, 12:55 UTCJul 18, 13:50 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-GPO page for operator, model, and routing details .

Mode-S 4CAA54 frequently asked

What is Mode-S code 4CAA54?
4CAA54 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GPO.
Where is Mode-S 4CAA54 registered?
Mode-S code 4CAA54 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAA54 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAA54, octal 23125124, decimal 5,024,340.
What flights does 4CAA54 operate?
Mode-S 4CAA54 has broadcast 20 distinct callsigns, including EAI41D, EAI54VJ, EAI23C, EAI55SK, EAI48D.