Apparatus

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sensors Mode-S transponder

4CAC63

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-AZB · BOEING 737-800

Hex
4CAC63
Octal
23126143
Decimal
5,024,867
Country
IE
Tail
EI-AZB
Type
B738
No current signal · last broadcast Jul 22, 20:55 UTC
Flights observed
264
Distinct callsigns
9
Country
IE
Last broadcast
Jul 22, 20:55 UTC

Last known position

Most recent position reported by Mode-S 4CAC63.

Country allocation

The ICAO 24-bit address 4CAC63 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 9 distinct

Callsign Airline Flights Last seen
ABR294 - 67 2026-07-22
ABR291 - 67 2026-07-22
ABR421 - 63 2026-07-22
ABR420 - 59 2026-07-20
ABR403 ASL Airlines Ireland 2 2026-06-01
ABR402 ASL Airlines Ireland 2 2026-06-01
ABR426 ASL Airlines Ireland 1 2026-04-15
ABR425 ASL Airlines Ireland 1 2026-04-15
ABR2201 - 1 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 ABR421 BCN → MXP Jul 22, 19:40 UTCJul 22, 20:50 UTC1h 10m
2026-07-22 ABR294 LEJ → BCN Jul 22, 13:55 UTCJul 22, 15:50 UTC1h 55m
2026-07-22 ABR291 - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-21 ABR294 LEJ → BCN Jul 21, 14:00 UTCJul 21, 16:05 UTC2h 5m
2026-07-21 ABR291 - Jul 21, 10:05 UTCJul 21, 12:00 UTC1h 55m
2026-07-20 - - Jul 20, 19:25 UTCJul 20, 19:50 UTC25m
2026-07-20 ABR294 LEJ → BCN Jul 20, 15:35 UTCJul 20, 18:00 UTC2h 25m
2026-07-20 ABR291 - Jul 20, 09:30 UTCJul 20, 11:30 UTC2h 0m
2026-07-20 ABR420 MXP → BCN Jul 20, 00:05 UTCJul 20, 01:15 UTC1h 10m
2026-07-19 ABR421 BCN → MXP Jul 19, 19:15 UTCJul 19, 20:15 UTC1h 0m
2026-07-19 ABR294 LEJ → BCN Jul 19, 14:10 UTCJul 19, 16:15 UTC2h 5m
2026-07-19 ABR291 - Jul 19, 10:05 UTCJul 19, 12:05 UTC2h 0m
2026-07-17 ABR420 MXP → BCN Jul 17, 23:45 UTCJul 18, 00:55 UTC1h 10m
2026-07-17 ABR421 BCN → MXP Jul 17, 18:55 UTCJul 17, 20:10 UTC1h 15m
2026-07-17 ABR294 LEJ → BCN Jul 17, 15:29 UTCJul 17, 17:35 UTC2h 5m
2026-07-17 ABR291 BCN → LEJ Jul 17, 09:55 UTCJul 17, 11:50 UTC1h 55m
2026-07-17 ABR420 MXP → BCN Jul 17, 00:14 UTCJul 17, 01:29 UTC1h 15m
2026-07-16 ABR421 BCN → MXP Jul 16, 18:10 UTCJul 16, 19:25 UTC1h 15m
2026-07-16 ABR294 LEJ → BCN Jul 16, 13:54 UTCJul 16, 16:25 UTC2h 30m
2026-07-16 ABR291 BCN → LEJ Jul 16, 09:20 UTCJul 16, 11:10 UTC1h 50m
2026-07-16 ABR420 MXP → BCN Jul 16, 00:35 UTCJul 16, 01:50 UTC1h 15m
2026-07-15 ABR421 BCN → MXP Jul 15, 20:50 UTCJul 15, 22:00 UTC1h 10m
2026-07-15 ABR294 - Jul 15, 14:55 UTCJul 15, 17:10 UTC2h 15m
2026-07-15 ABR291 BCN → LEJ Jul 15, 10:30 UTCJul 15, 12:30 UTC2h 0m
2026-07-15 ABR420 MXP → BCN Jul 15, 00:00 UTCJul 15, 01:10 UTC1h 10m
2026-07-14 ABR421 BCN → MXP Jul 14, 20:10 UTCJul 14, 21:20 UTC1h 10m
2026-07-14 ABR294 - Jul 14, 14:45 UTCJul 14, 16:50 UTC2h 5m
2026-07-14 ABR291 BCN → LEJ Jul 14, 09:20 UTCJul 14, 11:10 UTC1h 50m
2026-07-14 ABR420 MXP → BCN Jul 14, 00:10 UTCJul 14, 01:20 UTC1h 10m
2026-07-13 ABR421 BCN → MXP Jul 13, 18:35 UTCJul 13, 20:00 UTC1h 25m
2026-07-13 ABR294 LEJ → BCN Jul 13, 13:50 UTCJul 13, 16:00 UTC2h 10m
2026-07-13 ABR291 BCN → LEJ Jul 13, 09:25 UTCJul 13, 11:15 UTC1h 50m
2026-07-12 ABR420 MXP → BCN Jul 12, 23:45 UTCJul 13, 01:01 UTC1h 15m
2026-07-12 ABR421 BCN → MXP Jul 12, 18:35 UTCJul 12, 19:45 UTC1h 10m
2026-07-12 ABR294 LEJ → BCN Jul 12, 13:55 UTCJul 12, 16:01 UTC2h 5m
2026-07-12 ABR291 BCN → LEJ Jul 12, 09:30 UTCJul 12, 11:30 UTC2h 0m
2026-07-11 ABR420 MXP → BCN Jul 11, 01:05 UTCJul 11, 02:15 UTC1h 10m
2026-07-10 ABR421 BCN → MXP Jul 10, 18:50 UTCJul 10, 20:15 UTC1h 25m
2026-07-10 ABR294 LEJ → BCN Jul 10, 14:00 UTCJul 10, 15:55 UTC1h 55m
2026-07-10 ABR291 - Jul 10, 09:35 UTCJul 10, 11:35 UTC2h 0m
2026-07-10 ABR420 MXP → BCN Jul 10, 00:05 UTCJul 10, 01:10 UTC1h 5m
2026-07-09 ABR421 BCN → MXP Jul 9, 18:20 UTCJul 9, 19:30 UTC1h 10m
2026-07-09 ABR294 LEJ → BCN Jul 9, 14:05 UTCJul 9, 15:55 UTC1h 50m
2026-07-09 ABR291 BCN → LEJ Jul 9, 09:15 UTCJul 9, 11:25 UTC2h 10m
2026-07-08 ABR420 MXP → BCN Jul 8, 23:50 UTCJul 9, 00:50 UTC1h 0m
2026-07-08 ABR421 BCN → MXP Jul 8, 18:15 UTCJul 8, 19:30 UTC1h 15m
2026-07-08 ABR294 LEJ → BCN Jul 8, 14:25 UTCJul 8, 16:20 UTC1h 55m
2026-07-08 ABR291 BCN → LEJ Jul 8, 09:20 UTCJul 8, 11:25 UTC2h 5m
2026-07-08 ABR420 - Jul 8, 00:00 UTCJul 8, 01:05 UTC1h 5m
2026-07-07 ABR421 BCN → MXP Jul 7, 18:20 UTCJul 7, 19:40 UTC1h 20m

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-AZB page for operator, model, and routing details .

Mode-S 4CAC63 frequently asked

What is Mode-S code 4CAC63?
4CAC63 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-AZB.
Where is Mode-S 4CAC63 registered?
Mode-S code 4CAC63 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC63 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC63, octal 23126143, decimal 5,024,867.
What flights does 4CAC63 operate?
Mode-S 4CAC63 has broadcast 9 distinct callsigns, including ABR294, ABR291, ABR421, ABR420, ABR403.