Apparatus

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sensors Mode-S transponder

4CAE21

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-LDA · AIRBUS A-300-600

Hex
4CAE21
Octal
23127041
Decimal
5,025,313
Country
IE
Tail
EI-LDA
Type
A306
No current signal · last broadcast 6h ago
Flights observed
136
Distinct callsigns
20
Country
IE
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 4CAE21.

Country allocation

The ICAO 24-bit address 4CAE21 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
BCS50Q - 12 2026-07-03
BCS13J - 12 2026-07-03
BCS7YL - 11 2026-06-26
BCS7078 - 11 2026-06-26
BCS3612 European Air Transport 10 2026-06-03
BCS8EL European Air Transport 9 2026-06-03
BCS6VC - 7 2026-07-06
BCS4214 - 7 2026-07-05
BCS9CG - 6 2026-07-01
BCS7993 European Air Transport 6 2026-05-28
BCS4VA - 6 2026-07-01
BCS76K - 5 2026-07-14
BCS59X - 5 2026-07-09
BCS24J - 5 2026-07-09
BCS6WA European Air Transport 4 2026-05-28
BCS3XV - 4 2026-07-08
BCS33G European Air Transport 3 2026-06-08
BCS5572 - 2 2026-07-10
BCS5571 - 2 2026-07-10
BCS26N European Air Transport 2 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 BCS76K LEJ → BUD Jul 14, 03:30 UTCJul 14, 04:25 UTC55m
2026-07-10 BCS1YM BRQ → LEJ Jul 10, 20:15 UTCJul 10, 21:00 UTC45m
2026-07-10 BCS5571 - Jul 10, 04:45 UTCJul 10, 05:05 UTC20m
2026-07-10 BCS5572 LEJ → OSR Jul 10, 02:55 UTCJul 10, 03:40 UTC45m
2026-07-09 BCS59X - Jul 9, 20:40 UTCJul 9, 22:00 UTC1h 20m
2026-07-09 BCS24J - Jul 9, 02:35 UTCJul 9, 03:45 UTC1h 10m
2026-07-08 BCS3XV BUD → LEJ Jul 8, 19:55 UTCJul 8, 20:55 UTC1h 0m
2026-07-08 BCS76K - Jul 8, 03:30 UTCJul 8, 04:30 UTC1h 0m
2026-07-07 BCS59X - Jul 7, 20:45 UTCJul 7, 22:10 UTC1h 25m
2026-07-07 BCS24J - Jul 7, 02:30 UTCJul 7, 03:35 UTC1h 5m
2026-07-06 BCS6VC STR → LEJ Jul 6, 20:10 UTCJul 6, 20:55 UTC45m
2026-07-05 BCS4214 LEJ → STR Jul 5, 19:35 UTCJul 5, 20:15 UTC40m
2026-07-03 BCS13J BTS → LEJ Jul 3, 20:20 UTCJul 3, 21:15 UTC55m
2026-07-03 BCS50Q LEJ → BTS Jul 3, 02:45 UTCJul 3, 03:35 UTC50m
2026-07-02 BCS13J BTS → LEJ Jul 2, 20:20 UTCJul 2, 21:15 UTC55m
2026-07-02 BCS50Q LEJ → BTS Jul 2, 02:50 UTCJul 2, 03:45 UTC55m
2026-07-01 BCS4VA ARN → LEJ Jul 1, 19:35 UTCJul 1, 21:10 UTC1h 35m
2026-07-01 BCS9CG LEJ → ARN Jul 1, 03:15 UTCJul 1, 04:30 UTC1h 15m
2026-06-30 BCS4VA - Jun 30, 19:35 UTCJun 30, 21:10 UTC1h 35m
2026-06-30 BCS9CG LEJ → ARN Jun 30, 03:00 UTCJun 30, 04:15 UTC1h 15m
2026-06-29 BCS4VA ARN → LEJ Jun 29, 19:29 UTCJun 29, 21:05 UTC1h 35m
2026-06-29 BCS9CG LEJ → ARN Jun 29, 02:50 UTCJun 29, 04:14 UTC1h 25m
2026-06-26 BCS7YL - Jun 26, 19:45 UTCJun 26, 21:24 UTC1h 40m
2026-06-26 BCS7078 LEJ → CIA Jun 26, 03:54 UTCJun 26, 05:19 UTC1h 25m
2026-06-25 BCS59X LYS → LEJ Jun 25, 20:45 UTCJun 25, 22:10 UTC1h 25m
2026-06-25 BCS24J LEJ → LYS Jun 25, 02:45 UTCJun 25, 03:54 UTC1h 10m
2026-06-24 BCS13J BTS → LEJ Jun 24, 20:30 UTCJun 24, 21:24 UTC55m
2026-06-24 BCS50Q LEJ → BTS Jun 24, 02:54 UTCJun 24, 03:44 UTC50m
2026-06-23 BCS4VA ARN → LEJ Jun 23, 19:19 UTCJun 23, 20:40 UTC1h 20m
2026-06-23 BCS9CG LEJ → ARN Jun 23, 02:55 UTCJun 23, 04:25 UTC1h 30m
2026-06-22 BCS7YL - Jun 22, 19:44 UTCJun 22, 21:19 UTC1h 35m
2026-06-21 BCS7078 LEJ → CIA Jun 21, 18:29 UTCJun 21, 20:00 UTC1h 30m
2026-06-19 BCS7YL - Jun 19, 20:09 UTCJun 19, 21:39 UTC1h 30m
2026-06-19 BCS7078 LEJ → CIA Jun 19, 03:39 UTCJun 19, 05:09 UTC1h 30m
2026-06-18 BCS7YL - Jun 18, 19:45 UTCJun 18, 21:20 UTC1h 35m
2026-06-18 BCS7078 LEJ → CIA Jun 18, 03:40 UTCJun 18, 05:00 UTC1h 20m
2026-06-17 BCS3XV BUD → LEJ Jun 17, 19:45 UTCJun 17, 20:50 UTC1h 5m
2026-06-17 BCS76K LEJ → BUD Jun 17, 03:55 UTCJun 17, 04:50 UTC55m
2026-06-16 BCS13J BTS → LEJ Jun 16, 20:20 UTCJun 16, 21:10 UTC50m
2026-06-16 BCS50Q LEJ → BTS Jun 16, 02:54 UTCJun 16, 03:45 UTC50m
2026-06-15 BCS4VA ARN → LEJ Jun 15, 19:20 UTCJun 15, 20:40 UTC1h 20m
2026-06-15 BCS9CG LEJ → LEJ Jun 15, 01:20 UTCJun 15, 02:55 UTC1h 35m
2026-06-12 BCS6VC STR → LEJ Jun 12, 20:20 UTCJun 12, 21:10 UTC50m
2026-06-12 BCS4214 LEJ → STR Jun 12, 03:45 UTCJun 12, 04:25 UTC40m
2026-06-11 BCS7YL LEJ → CIA Jun 11, 19:45 UTCJun 11, 21:30 UTC1h 45m
2026-06-11 BCS7078 LEJ → CIA Jun 11, 03:35 UTCJun 11, 05:10 UTC1h 35m
2026-06-10 BCS13J BTS → LEJ Jun 10, 20:20 UTCJun 10, 21:10 UTC50m
2026-06-10 BCS50Q LEJ → BTS Jun 10, 02:40 UTCJun 10, 03:30 UTC50m
2026-06-09 BCS13J BTS → LEJ Jun 9, 20:30 UTCJun 9, 21:05 UTC35m
2026-06-09 BCS50Q LEJ → BTS Jun 9, 03:05 UTCJun 9, 03:55 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-LDA page for operator, model, and routing details .

Mode-S 4CAE21 frequently asked

What is Mode-S code 4CAE21?
4CAE21 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-LDA.
Where is Mode-S 4CAE21 registered?
Mode-S code 4CAE21 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAE21 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 4CAE21, octal 23127041, decimal 5,025,313.
What flights does 4CAE21 operate?
Mode-S 4CAE21 has broadcast 20 distinct callsigns, including BCS50Q, BCS13J, BCS7YL, BCS7078, BCS3612.