Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 1h ago
Flights observed
236
Distinct callsigns
9
Country
IE
Last broadcast
1h ago

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 - 59 2026-07-13
ABR291 - 59 2026-07-13
ABR421 - 57 2026-07-13
ABR420 - 54 2026-07-14
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
2026-07-14 ABR420 - Jul 14, 00:10 UTCJul 14, 00:45 UTC35m
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
2026-07-07 ABR294 LEJ → BCN Jul 7, 13:50 UTCJul 7, 15:45 UTC1h 55m
2026-07-07 ABR291 BCN → LEJ Jul 7, 09:30 UTCJul 7, 11:35 UTC2h 5m
2026-07-06 ABR294 LEJ → BCN Jul 6, 14:25 UTCJul 6, 16:15 UTC1h 50m
2026-07-06 ABR291 BCN → LEJ Jul 6, 10:50 UTCJul 6, 13:00 UTC2h 10m
2026-07-05 ABR294 LEJ → BCN Jul 5, 14:30 UTCJul 5, 16:20 UTC1h 50m
2026-07-05 ABR291 BCN → LEJ Jul 5, 10:45 UTCJul 5, 13:05 UTC2h 20m
2026-07-03 ABR420 MXP → BCN Jul 3, 23:50 UTCJul 4, 01:00 UTC1h 10m
2026-07-03 ABR421 BCN → MXP Jul 3, 18:20 UTCJul 3, 19:45 UTC1h 25m
2026-07-03 ABR294 LEJ → BCN Jul 3, 13:40 UTCJul 3, 15:35 UTC1h 55m
2026-07-03 ABR291 BCN → LEJ Jul 3, 09:00 UTCJul 3, 11:05 UTC2h 5m
2026-07-02 ABR420 MXP → BCN Jul 2, 23:45 UTCJul 3, 00:50 UTC1h 5m
2026-07-02 ABR421 BCN → MXP Jul 2, 18:35 UTCJul 2, 20:00 UTC1h 25m
2026-07-02 ABR294 LEJ → BCN Jul 2, 14:55 UTCJul 2, 16:50 UTC1h 55m
2026-07-02 ABR291 - Jul 2, 10:50 UTCJul 2, 13:00 UTC2h 10m
2026-07-01 ABR420 - Jul 1, 23:45 UTCJul 2, 00:45 UTC1h 0m
2026-07-01 ABR421 BCN → MXP Jul 1, 19:15 UTCJul 1, 20:35 UTC1h 20m
2026-07-01 ABR294 LEJ → BCN Jul 1, 14:35 UTCJul 1, 16:40 UTC2h 5m
2026-07-01 ABR291 - Jul 1, 10:00 UTCJul 1, 12:00 UTC2h 0m
2026-06-30 ABR420 MXP → BCN Jun 30, 23:45 UTCJul 1, 00:55 UTC1h 10m
2026-06-30 ABR421 BCN → MXP Jun 30, 18:25 UTCJun 30, 19:40 UTC1h 15m
2026-06-30 ABR294 - Jun 30, 14:15 UTCJun 30, 16:15 UTC2h 0m
2026-06-30 ABR291 BCN → LEJ Jun 30, 09:25 UTCJun 30, 11:25 UTC2h 0m
2026-06-29 ABR420 MXP → BCN Jun 29, 23:29 UTCJun 30, 00:30 UTC1h 0m
2026-06-29 ABR421 BCN → MXP Jun 29, 20:24 UTCJun 29, 21:44 UTC1h 20m
2026-06-29 ABR294 LEJ → BCN Jun 29, 16:44 UTCJun 29, 18:49 UTC2h 5m
2026-06-29 ABR291 BCN → LEJ Jun 29, 09:50 UTCJun 29, 11:45 UTC1h 55m
2026-06-28 ABR420 MXP → BCN Jun 28, 23:50 UTCJun 29, 00:54 UTC1h 5m
2026-06-28 ABR421 BCN → MXP Jun 28, 18:40 UTCJun 28, 19:55 UTC1h 15m

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 1h ago.
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.