Apparatus

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sensors Mode-S transponder

4CAED4

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-HRD · BOEING 737-800

Hex
4CAED4
Octal
23127324
Decimal
5,025,492
Country
IE
Tail
EI-HRD
Type
B738
Broadcasting now · callsign BCS204 · 24,000 ft
Flights observed
171
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Current position

4CAED4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAED4 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
BCS5917 - 27 2026-06-30
BCS5916 - 24 2026-06-30
BCS5914 - 18 2026-06-30
BCS3AL - 16 2026-07-01
BCS5868 - 9 2026-06-08
BCS5867 European Air Transport 9 2026-06-08
BCS4PK - 6 2026-07-15
BCS2960 - 6 2026-07-14
BCS95W European Air Transport 5 2026-04-24
BCS21Q European Air Transport 5 2026-04-24
BCS5302 European Air Transport 4 2026-05-05
BCS406 European Air Transport 4 2026-05-05
BCS32B European Air Transport 4 2026-04-23
BCS1TQ - 4 2026-07-14
BCS2200 - 3 2026-07-09
BCS2135 European Air Transport 3 2026-06-29
BCS2134 European Air Transport 3 2026-06-29
BCS204 - 3 2026-07-09
BCS167 - 2 2026-07-10
ABR771 - 2 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 BCS4PK - Jul 15, 02:30 UTCJul 15, 03:00 UTC30m
2026-07-14 BCS1TQ - Jul 14, 19:05 UTCJul 14, 21:10 UTC2h 5m
2026-07-14 BCS2960 - Jul 14, 02:50 UTCJul 14, 04:55 UTC2h 5m
2026-07-13 BCS2215 - Jul 13, 21:45 UTCJul 13, 22:55 UTC1h 10m
2026-07-12 BCS8PA LEJ → STN Jul 12, 19:10 UTCJul 12, 20:35 UTC1h 25m
2026-07-10 BCS167 CGN → LEJ Jul 10, 21:05 UTCJul 10, 21:40 UTC35m
2026-07-10 BCS4PK LEJ → CGN Jul 10, 02:25 UTCJul 10, 03:00 UTC35m
2026-07-09 BCS2200 - Jul 9, 23:45 UTCJul 10, 00:45 UTC1h 0m
2026-07-09 BCS204 CGN → BRU Jul 9, 21:30 UTCJul 9, 21:55 UTC25m
2026-07-09 BCS4PK LEJ → CGN Jul 9, 02:25 UTCJul 9, 03:05 UTC40m
2026-07-08 BCS2200 - Jul 8, 23:40 UTCJul 9, 00:40 UTC1h 0m
2026-07-08 BCS204 CGN → BRU Jul 8, 21:35 UTCJul 8, 22:00 UTC25m
2026-07-08 BCS4PK LEJ → CGN Jul 8, 02:50 UTCJul 8, 03:35 UTC45m
2026-07-07 BCS2200 - Jul 7, 23:40 UTCJul 8, 00:35 UTC55m
2026-07-07 BCS204 CGN → BRU Jul 7, 04:15 UTCJul 7, 04:45 UTC30m
2026-07-07 BCS4PK LEJ → CGN Jul 7, 02:20 UTCJul 7, 03:05 UTC45m
2026-07-06 ABR771 LEJ → LEJ Jul 6, 15:25 UTCJul 6, 16:45 UTC1h 20m
2026-07-01 BCS3AL - Jul 1, 00:55 UTCJul 1, 01:50 UTC55m
2026-06-30 BCS5914 - Jun 30, 23:00 UTCJun 30, 23:45 UTC45m
2026-06-30 BCS5917 - Jun 30, 20:00 UTCJun 30, 20:55 UTC55m
2026-06-30 BCS5916 - Jun 30, 03:40 UTCJun 30, 04:30 UTC50m
2026-06-29 BCS2135 EDI → LEJ Jun 29, 20:00 UTCJun 29, 21:39 UTC1h 40m
2026-06-29 BCS2134 LEJ → EDI Jun 29, 02:59 UTCJun 29, 04:50 UTC1h 50m
2026-06-26 BCS5917 - Jun 26, 19:55 UTCJun 26, 20:44 UTC50m
2026-06-26 BCS5916 - Jun 26, 03:45 UTCJun 26, 04:39 UTC55m
2026-06-25 BCS5917 - Jun 25, 20:05 UTCJun 25, 20:54 UTC50m
2026-06-25 BCS5916 - Jun 25, 03:54 UTCJun 25, 04:54 UTC1h 0m
2026-06-25 BCS3AL - Jun 25, 00:44 UTCJun 25, 01:35 UTC50m
2026-06-24 BCS5914 - Jun 24, 22:49 UTCJun 24, 23:40 UTC50m
2026-06-24 BCS5917 - Jun 24, 19:55 UTCJun 24, 20:44 UTC50m
2026-06-24 BCS5916 - Jun 24, 03:50 UTCJun 24, 04:44 UTC55m
2026-06-24 BCS3AL - Jun 24, 00:59 UTCJun 24, 01:49 UTC50m
2026-06-23 BCS5914 - Jun 23, 22:44 UTCJun 23, 23:39 UTC55m
2026-06-23 BCS5917 - Jun 23, 20:04 UTCJun 23, 20:54 UTC50m
2026-06-23 BCS5916 - Jun 23, 04:09 UTCJun 23, 05:00 UTC50m
2026-06-22 BCS2135 EDI → LEJ Jun 22, 19:34 UTCJun 22, 21:10 UTC1h 35m
2026-06-22 BCS2134 LEJ → EDI Jun 22, 03:10 UTCJun 22, 04:59 UTC1h 50m
2026-06-19 BCS5917 - Jun 19, 19:54 UTCJun 19, 20:44 UTC50m
2026-06-19 BCS5916 - Jun 19, 03:44 UTCJun 19, 04:39 UTC55m
2026-06-19 BCS3AL KTW → LEJ Jun 19, 00:49 UTCJun 19, 01:34 UTC45m
2026-06-18 BCS5914 - Jun 18, 22:45 UTCJun 18, 23:35 UTC50m
2026-06-18 BCS5917 - Jun 18, 20:00 UTCJun 18, 20:55 UTC55m
2026-06-18 BCS5916 - Jun 18, 03:45 UTCJun 18, 04:35 UTC50m
2026-06-17 BCS5917 - Jun 17, 21:55 UTCJun 17, 22:45 UTC50m
2026-06-17 BCS5916 - Jun 17, 03:55 UTCJun 17, 04:45 UTC50m
2026-06-17 BCS3AL KTW → LEJ Jun 17, 01:15 UTCJun 17, 02:10 UTC55m
2026-06-16 BCS5914 - Jun 16, 23:00 UTCJun 16, 23:55 UTC55m
2026-06-16 BCS5917 - Jun 16, 19:55 UTCJun 16, 20:50 UTC55m
2026-06-16 BCS5916 LEJ → KTW Jun 16, 03:50 UTCJun 16, 04:45 UTC55m
2026-06-16 BCS3AL KTW → LEJ Jun 16, 01:00 UTCJun 16, 01:55 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-HRD page for operator, model, and routing details .

Mode-S 4CAED4 frequently asked

What is Mode-S code 4CAED4?
4CAED4 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-HRD.
Where is Mode-S 4CAED4 registered?
Mode-S code 4CAED4 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAED4 broadcasting right now?
Yes. Mode-S 4CAED4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAED4, octal 23127324, decimal 5,025,492.
What flights does 4CAED4 operate?
Mode-S 4CAED4 has broadcast 20 distinct callsigns, including BCS5917, BCS5916, BCS5914, BCS3AL, BCS5868.