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 11h ago
Flights observed
74
Distinct callsigns
20
Country
IE
Last broadcast
11h 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
BCS3612 European Air Transport 9 2026-05-29
BCS8EL European Air Transport 8 2026-05-29
BCS7YL European Air Transport 6 2026-05-27
BCS7993 European Air Transport 6 2026-05-28
BCS7078 European Air Transport 6 2026-05-27
BCS50Q European Air Transport 6 2026-05-26
BCS13J European Air Transport 6 2026-05-26
BCS6WA European Air Transport 4 2026-05-28
BCS6VC European Air Transport 4 2026-05-12
BCS4214 European Air Transport 4 2026-05-12
BCS59X European Air Transport 2 2026-05-11
BCS33G European Air Transport 2 2026-04-17
BCS24J European Air Transport 2 2026-05-11
BCS8WF European Air Transport 1 2026-05-16
BCS76K European Air Transport 1 2026-05-19
BCS715 European Air Transport 1 2026-05-14
BCS5572 European Air Transport 1 2026-04-24
BCS5571 European Air Transport 1 2026-04-24
BCS451 European Air Transport 1 2026-05-17
BCS3XV European Air Transport 1 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BCS8EL HEL → LEJ May 29, 19:40 UTCMay 29, 21:20 UTC1h 40m
2026-05-29 BCS3612 LEJ → HEL May 29, 02:55 UTCMay 29, 04:45 UTC1h 50m
2026-05-28 BCS7993 VCE → LEJ May 28, 20:45 UTCMay 28, 21:55 UTC1h 10m
2026-05-28 BCS6WA LEJ → VCE May 28, 03:25 UTCMay 28, 04:35 UTC1h 10m
2026-05-27 BCS7YL LEJ → CIA May 27, 19:50 UTCMay 27, 21:30 UTC1h 40m
2026-05-27 BCS7078 LEJ → CIA May 27, 03:45 UTCMay 27, 05:09 UTC1h 25m
2026-05-26 BCS13J BTS → LEJ May 26, 20:15 UTCMay 26, 21:09 UTC55m
2026-05-26 BCS50Q LEJ → BTS May 26, 02:55 UTCMay 26, 03:45 UTC50m
2026-05-25 BCS13J BTS → LEJ May 25, 20:34 UTCMay 25, 21:24 UTC50m
2026-05-24 BCS50Q LEJ → BTS May 24, 23:35 UTCMay 24, 23:46 UTC11m
2026-05-22 BCS7YL LEJ → CIA May 22, 19:55 UTCMay 22, 21:35 UTC1h 40m
2026-05-22 BCS7078 LEJ → CIA May 22, 03:50 UTCMay 22, 05:15 UTC1h 25m
2026-05-21 BCS7993 VCE → LEJ May 21, 20:35 UTCMay 21, 21:45 UTC1h 10m
2026-05-21 BCS6WA LEJ → VCE May 21, 03:55 UTCMay 21, 05:00 UTC1h 5m
2026-05-20 BCS7YL LEJ → CIA May 20, 19:45 UTCMay 20, 21:20 UTC1h 35m
2026-05-20 BCS7078 LEJ → CIA May 20, 03:45 UTCMay 20, 05:15 UTC1h 31m
2026-05-19 BCS3XV BUD → LEJ May 19, 19:40 UTCMay 19, 20:35 UTC55m
2026-05-19 BCS76K LEJ → BUD May 19, 03:35 UTCMay 19, 04:40 UTC1h 5m
2026-05-18 BCS13J BTS → LEJ May 18, 20:30 UTCMay 18, 21:25 UTC55m
2026-05-17 BCS50Q LEJ → BTS May 17, 23:40 UTCMay 18, 00:35 UTC55m
2026-05-17 BCS451 EMA → BRU May 17, 03:50 UTCMay 17, 05:15 UTC1h 25m
2026-05-16 BCS8WF LEJ → EMA May 16, 00:50 UTCMay 16, 02:35 UTC1h 45m
2026-05-15 BCS8EL HEL → LEJ May 15, 19:40 UTCMay 15, 21:30 UTC1h 50m
2026-05-15 BCS3612 LEJ → HEL May 15, 03:20 UTCMay 15, 04:55 UTC1h 35m
2026-05-14 BCS715 SVQ → LEJ May 14, 08:50 UTCMay 14, 10:35 UTC1h 45m
2026-05-14 BCS3612 LEJ → HEL May 14, 02:45 UTCMay 14, 04:25 UTC1h 40m
2026-05-13 BCS8EL HEL → LEJ May 13, 19:40 UTCMay 13, 21:30 UTC1h 50m
2026-05-13 BCS3612 LEJ → HEL May 13, 02:50 UTCMay 13, 04:35 UTC1h 45m
2026-05-12 BCS6VC STR → LEJ May 12, 20:10 UTCMay 12, 20:50 UTC40m
2026-05-12 BCS4214 LEJ → STR May 12, 03:30 UTCMay 12, 04:10 UTC40m
2026-05-11 BCS59X LYS → LEJ May 11, 20:35 UTCMay 11, 21:55 UTC1h 20m
2026-05-11 BCS24J LEJ → LYS May 11, 00:40 UTCMay 11, 02:05 UTC1h 25m
2026-05-08 BCS6VC STR → LEJ May 8, 20:05 UTCMay 8, 20:45 UTC40m
2026-05-08 BCS4214 LEJ → STR May 8, 03:35 UTCMay 8, 04:19 UTC45m
2026-05-07 BCS7993 VCE → LEJ May 7, 20:35 UTCMay 7, 21:35 UTC1h 0m
2026-05-07 BCS6WA LEJ → VCE May 7, 03:25 UTCMay 7, 04:35 UTC1h 10m
2026-05-06 BCS13J BTS → LEJ May 6, 20:20 UTCMay 6, 21:15 UTC55m
2026-05-06 BCS50Q LEJ → BTS May 6, 03:25 UTCMay 6, 04:15 UTC50m
2026-05-05 BCS8EL HEL → LEJ May 5, 19:55 UTCMay 5, 22:05 UTC2h 10m
2026-05-05 BCS3612 LEJ → HEL May 5, 02:50 UTCMay 5, 04:30 UTC1h 40m
2026-05-04 BCS6VC STR → LEJ May 4, 20:15 UTCMay 4, 20:55 UTC40m
2026-05-03 BCS4214 LEJ → STR May 3, 19:34 UTCMay 3, 20:15 UTC40m
2026-04-30 BCS8EL HEL → LEJ Apr 30, 19:35 UTCApr 30, 21:15 UTC1h 40m
2026-04-30 BCS3612 LEJ → HEL Apr 30, 02:50 UTCApr 30, 05:00 UTC2h 10m
2026-04-29 BCS6VC STR → LEJ Apr 29, 20:10 UTCApr 29, 20:55 UTC45m
2026-04-29 BCS4214 LEJ → STR Apr 29, 05:00 UTCApr 29, 05:40 UTC40m
2026-04-28 BCS59X LYS → LEJ Apr 28, 20:40 UTCApr 28, 22:00 UTC1h 20m
2026-04-28 BCS24J LEJ → LYS Apr 28, 02:40 UTCApr 28, 03:55 UTC1h 15m
2026-04-27 BCS13J BTS → LEJ Apr 27, 20:15 UTCApr 27, 21:15 UTC1h 0m
2026-04-26 BCS50Q LEJ → BTS Apr 26, 23:35 UTCApr 27, 00:25 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 11h 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 BCS3612, BCS8EL, BCS7YL, BCS7993, BCS7078.