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 Jul 25, 09:35 UTC
Flights observed
156
Distinct callsigns
20
Country
IE
Last broadcast
Jul 25, 09:35 UTC

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
BCS7YL European Air Transport 14 2026-07-24
BCS7078 European Air Transport 14 2026-07-24
BCS50Q - 13 2026-07-15
BCS13J - 13 2026-07-15
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
BCS76K - 6 2026-07-17
BCS4VA - 6 2026-07-01
BCS3XV - 6 2026-07-17
BCS59X - 5 2026-07-09
BCS24J - 5 2026-07-09
BCS6WA European Air Transport 4 2026-05-28
BCS1YM - 4 2026-07-21
BCS5572 - 3 2026-07-21
BCS5571 European Air Transport 3 2026-07-21
BCS33G European Air Transport 3 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 BCS3317 OSL → CPH Jul 25, 08:00 UTCJul 25, 09:30 UTC1h 30m
2026-07-25 BCS63H LEJ → OSL Jul 25, 04:25 UTCJul 25, 05:50 UTC1h 25m
2026-07-24 BCS7YL LEJ → CIA Jul 24, 19:45 UTCJul 24, 21:25 UTC1h 40m
2026-07-24 BCS7078 LEJ → CIA Jul 24, 03:50 UTCJul 24, 05:05 UTC1h 15m
2026-07-23 BCS7YL LEJ → CIA Jul 23, 19:55 UTCJul 23, 21:40 UTC1h 45m
2026-07-23 BCS7078 LEJ → CIA Jul 23, 03:45 UTCJul 23, 05:10 UTC1h 25m
2026-07-22 BCS7YL LEJ → CIA Jul 22, 19:50 UTCJul 22, 21:30 UTC1h 40m
2026-07-22 BCS7078 LEJ → CIA Jul 22, 03:50 UTCJul 22, 05:15 UTC1h 25m
2026-07-21 BCS1YM BRQ → LEJ Jul 21, 20:25 UTCJul 21, 21:10 UTC45m
2026-07-21 BCS5571 OSR → LEJ Jul 21, 04:55 UTCJul 21, 05:15 UTC20m
2026-07-21 BCS5572 - Jul 21, 03:05 UTCJul 21, 03:50 UTC45m
2026-07-20 BCS1YM - Jul 20, 20:20 UTCJul 20, 21:00 UTC40m
2026-07-20 BCS2KK LEJ → BRQ Jul 20, 01:40 UTCJul 20, 02:25 UTC45m
2026-07-17 BCS3XV - Jul 17, 20:20 UTCJul 17, 21:20 UTC1h 0m
2026-07-17 BCS76K - Jul 17, 05:25 UTCJul 17, 06:25 UTC1h 0m
2026-07-16 BCS44C CPH → LEJ Jul 16, 21:19 UTCJul 16, 22:15 UTC55m
2026-07-16 BCS20A LEJ → CPH Jul 16, 02:05 UTCJul 16, 02:50 UTC45m
2026-07-15 BCS13J BTS → LEJ Jul 15, 20:25 UTCJul 15, 21:20 UTC55m
2026-07-15 BCS50Q LEJ → BTS Jul 15, 02:45 UTCJul 15, 03:35 UTC50m
2026-07-14 BCS3XV - Jul 14, 19:55 UTCJul 14, 21:10 UTC1h 15m
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

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 Jul 25, 09:35 UTC.
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 BCS7YL, BCS7078, BCS50Q, BCS13J, BCS3612.