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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 6h ago
Flights observed
707
Distinct callsigns
20
Country
IE
Last broadcast
6h ago

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 - 19 2026-07-11
EAI23C - 19 2026-07-08
EAI54VJ - 18 2026-07-11
EAI55SK - 16 2026-07-11
EAI22MW - 16 2026-07-08
EAI21HA - 15 2026-07-08
EAI48D Elite Air 14 2026-07-10
EAI43D - 14 2026-07-10
EAI31F - 14 2026-07-06
EAI42D Elite Air 13 2026-07-10
EAI2GL - 13 2026-07-08
EAI17N Elite Air 13 2026-07-10
EAI16M Elite Air 13 2026-07-10
EAI75B - 12 2026-07-11
EAI74G Elite Air 12 2026-07-11
EAI3HP - 12 2026-07-06
EAI73N - 11 2026-06-17
EAI37E - 11 2026-06-17
EAI8C Elite Air 10 2026-07-14
EAI84U Elite Air 10 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 EAI09U SOU → DUB Jul 14, 19:25 UTCJul 14, 20:35 UTC1h 10m
2026-07-14 EAI8C DUB → SOU Jul 14, 17:25 UTCJul 14, 18:40 UTC1h 15m
2026-07-14 EAI31Q EXT → DUB Jul 14, 15:35 UTCJul 14, 16:35 UTC1h 0m
2026-07-14 EAI33S DUB → EXT Jul 14, 13:50 UTCJul 14, 14:50 UTC1h 0m
2026-07-14 EAI38D MAN → DUB Jul 14, 12:00 UTCJul 14, 12:45 UTC45m
2026-07-14 EAI69M DUB → MAN Jul 14, 10:20 UTCJul 14, 11:10 UTC50m
2026-07-14 EAI91M LBA → DUB Jul 14, 08:05 UTCJul 14, 09:10 UTC1h 5m
2026-07-14 EAI9L DUB → LBA Jul 14, 06:20 UTCJul 14, 07:15 UTC55m
2026-07-13 EAI79BX - Jul 13, 18:55 UTCJul 13, 19:55 UTC1h 0m
2026-07-13 EAI78BX - Jul 13, 17:20 UTCJul 13, 18:15 UTC55m
2026-07-13 EAI31Q EXT → DUB Jul 13, 15:30 UTCJul 13, 16:30 UTC1h 0m
2026-07-13 EAI33S DUB → EXT Jul 13, 13:50 UTCJul 13, 14:55 UTC1h 5m
2026-07-13 EAI13U - Jul 13, 12:15 UTCJul 13, 12:50 UTC35m
2026-07-13 EAI12B - Jul 13, 11:00 UTCJul 13, 11:25 UTC25m
2026-07-13 EAI17W - Jul 13, 08:45 UTCJul 13, 09:55 UTC1h 10m
2026-07-13 EAI32V DUB → MAN Jul 13, 06:50 UTCJul 13, 07:45 UTC55m
2026-07-12 EAI89DF BRS → DUB Jul 12, 19:35 UTCJul 12, 20:35 UTC1h 0m
2026-07-12 EAI17C ORK → BRS Jul 12, 17:25 UTCJul 12, 18:35 UTC1h 10m
2026-07-12 EAI18K BRS → ORK Jul 12, 15:45 UTCJul 12, 16:50 UTC1h 5m
2026-07-12 EAI86W DUB → BRS Jul 12, 14:05 UTCJul 12, 15:01 UTC55m
2026-07-12 EAI39V - Jul 12, 12:25 UTCJul 12, 13:10 UTC45m
2026-07-12 EAI19L - Jul 12, 11:01 UTCJul 12, 11:40 UTC40m
2026-07-12 EAI34N - Jul 12, 08:45 UTCJul 12, 10:05 UTC1h 20m
2026-07-12 EAI42A - Jul 12, 06:55 UTCJul 12, 08:05 UTC1h 10m
2026-07-11 EAI75B - Jul 11, 18:00 UTCJul 11, 19:00 UTC1h 0m
2026-07-11 EAI74G DUB → BHX Jul 11, 16:25 UTCJul 11, 17:10 UTC45m
2026-07-11 EAI71G NQY → DUB Jul 11, 14:35 UTCJul 11, 15:35 UTC1h 0m
2026-07-11 EAI62N - Jul 11, 12:55 UTCJul 11, 13:50 UTC55m
2026-07-11 EAI55SK EDI → DUB Jul 11, 10:50 UTCJul 11, 12:00 UTC1h 10m
2026-07-11 EAI54VJ - Jul 11, 08:45 UTCJul 11, 09:45 UTC1h 0m
2026-07-11 EAI41D CFN → DUB Jul 11, 07:00 UTCJul 11, 07:40 UTC40m
2026-07-10 EAI48D DUB → CFN Jul 10, 18:00 UTCJul 10, 18:35 UTC35m
2026-07-10 EAI17N IOM → DUB Jul 10, 16:35 UTCJul 10, 17:10 UTC35m
2026-07-10 EAI16M DUB → IOM Jul 10, 15:20 UTCJul 10, 15:45 UTC25m
2026-07-10 EAI43D CFN → DUB Jul 10, 13:30 UTCJul 10, 14:10 UTC40m
2026-07-10 EAI42D DUB → CFN Jul 10, 12:20 UTCJul 10, 12:55 UTC35m
2026-07-10 EAI17W MAN → DUB Jul 10, 10:25 UTCJul 10, 11:15 UTC50m
2026-07-10 EAI32V DUB → MAN Jul 10, 07:25 UTCJul 10, 08:50 UTC1h 25m
2026-07-09 EAI29GA - Jul 9, 20:40 UTCJul 9, 21:30 UTC50m
2026-07-09 EAI38JL ORK → GLA Jul 9, 18:45 UTCJul 9, 20:05 UTC1h 20m
2026-07-09 EAI43S - Jul 9, 16:40 UTCJul 9, 18:00 UTC1h 20m
2026-07-09 EAI28QB DUB → GLA Jul 9, 14:55 UTCJul 9, 15:45 UTC50m
2026-07-09 EAI55YA - Jul 9, 13:05 UTCJul 9, 14:10 UTC1h 5m
2026-07-09 EAI4WD DUB → EDI Jul 9, 11:05 UTCJul 9, 12:00 UTC55m
2026-07-09 EAI31M SOU → DUB Jul 9, 08:30 UTCJul 9, 09:55 UTC1h 25m
2026-07-09 EAI7S DUB → SOU Jul 9, 06:20 UTCJul 9, 07:30 UTC1h 10m
2026-07-08 EAI09U SOU → DUB Jul 8, 19:10 UTCJul 8, 20:25 UTC1h 15m
2026-07-08 EAI8C DUB → SOU Jul 8, 17:15 UTCJul 8, 18:30 UTC1h 15m
2026-07-08 EAI31Q EXT → DUB Jul 8, 15:05 UTCJul 8, 16:05 UTC1h 0m
2026-07-08 EAI33S DUB → EXT Jul 8, 13:20 UTCJul 8, 14:20 UTC1h 0m

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 6h ago.
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, EAI23C, EAI54VJ, EAI55SK, EAI22MW.