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sensors Mode-S transponder

4CAC66

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-AZE · BOEING 737-800

Hex
4CAC66
Octal
23126146
Decimal
5,024,870
Country
IE
Tail
EI-AZE
Type
B738
Broadcasting now · callsign ABR425 · 20,025 ft
Flights observed
121
Distinct callsigns
6
Country
IE
Last broadcast
3d ago

Current position

4CAC66 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CAC66 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 6 distinct

Callsign Airline Flights Last seen
ABR403 ASL Airlines Ireland 31 2026-05-21
ABR402 ASL Airlines Ireland 30 2026-05-22
ABR426 ASL Airlines Ireland 26 2026-07-10
ABR425 - 26 2026-07-10
ABR468 ASL Airlines Ireland 5 2026-07-01
ABR469 - 3 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 ABR426 LGG → MXP Jul 10, 12:00 UTCJul 10, 13:10 UTC1h 10m
2026-07-10 ABR425 - Jul 10, 09:00 UTCJul 10, 10:05 UTC1h 5m
2026-07-08 ABR426 LGG → MXP Jul 8, 11:55 UTCJul 8, 13:00 UTC1h 5m
2026-07-08 ABR425 - Jul 8, 09:05 UTCJul 8, 10:15 UTC1h 10m
2026-07-07 ABR426 LGG → MXP Jul 7, 11:55 UTCJul 7, 13:00 UTC1h 5m
2026-07-07 ABR425 - Jul 7, 09:10 UTCJul 7, 10:20 UTC1h 10m
2026-07-06 ABR426 LGG → MXP Jul 6, 12:05 UTCJul 6, 13:15 UTC1h 10m
2026-07-06 ABR425 - Jul 6, 09:05 UTCJul 6, 10:10 UTC1h 5m
2026-07-01 ABR468 LEJ → MXP Jul 1, 16:15 UTCJul 1, 17:35 UTC1h 20m
2026-07-01 ABR469 MXP → HAJ Jul 1, 12:15 UTCJul 1, 13:25 UTC1h 10m
2026-06-30 ABR426 LGG → MXP Jun 30, 12:15 UTCJun 30, 13:20 UTC1h 5m
2026-06-30 ABR425 - Jun 30, 09:05 UTCJun 30, 10:20 UTC1h 15m
2026-06-29 ABR426 LGG → MXP Jun 29, 12:05 UTCJun 29, 13:14 UTC1h 10m
2026-06-29 ABR425 - Jun 29, 09:14 UTCJun 29, 10:20 UTC1h 5m
2026-06-28 ABR426 LGG → MXP Jun 28, 12:44 UTCJun 28, 13:49 UTC1h 5m
2026-06-28 ABR425 - Jun 28, 09:05 UTCJun 28, 10:04 UTC1h 0m
2026-06-26 ABR426 LGG → MXP Jun 26, 12:19 UTCJun 26, 13:24 UTC1h 5m
2026-06-26 ABR425 - Jun 26, 08:54 UTCJun 26, 09:59 UTC1h 5m
2026-06-25 ABR426 LGG → MXP Jun 25, 11:50 UTCJun 25, 12:50 UTC1h 0m
2026-06-25 ABR425 - Jun 25, 08:55 UTCJun 25, 09:55 UTC1h 0m
2026-06-24 ABR426 LGG → MXP Jun 24, 11:59 UTCJun 24, 13:00 UTC1h 0m
2026-06-24 ABR425 - Jun 24, 09:00 UTCJun 24, 10:14 UTC1h 15m
2026-06-22 ABR426 LGG → MXP Jun 22, 12:05 UTCJun 22, 13:10 UTC1h 5m
2026-06-22 ABR425 - Jun 22, 09:04 UTCJun 22, 10:15 UTC1h 10m
2026-06-21 ABR426 LGG → MXP Jun 21, 12:04 UTCJun 21, 13:09 UTC1h 5m
2026-06-21 ABR425 - Jun 21, 08:54 UTCJun 21, 09:59 UTC1h 5m
2026-06-19 ABR426 LGG → MXP Jun 19, 12:04 UTCJun 19, 13:09 UTC1h 5m
2026-06-19 ABR425 - Jun 19, 09:09 UTCJun 19, 10:09 UTC1h 0m
2026-06-18 ABR426 LGG → MXP Jun 18, 12:05 UTCJun 18, 13:05 UTC1h 0m
2026-06-18 ABR425 - Jun 18, 09:05 UTCJun 18, 10:10 UTC1h 5m
2026-06-17 ABR426 LGG → MXP Jun 17, 12:10 UTCJun 17, 13:15 UTC1h 5m
2026-06-17 ABR425 - Jun 17, 09:05 UTCJun 17, 10:20 UTC1h 15m
2026-06-16 ABR426 LGG → MXP Jun 16, 12:14 UTCJun 16, 13:09 UTC55m
2026-06-16 ABR425 - Jun 16, 10:04 UTCJun 16, 11:10 UTC1h 5m
2026-06-15 ABR426 LGG → MXP Jun 15, 12:25 UTCJun 15, 13:25 UTC1h 0m
2026-06-15 ABR425 - Jun 15, 09:35 UTCJun 15, 10:45 UTC1h 10m
2026-06-14 ABR426 LGG → MXP Jun 14, 12:05 UTCJun 14, 13:10 UTC1h 5m
2026-06-14 ABR425 - Jun 14, 09:00 UTCJun 14, 10:10 UTC1h 10m
2026-06-11 ABR426 LGG → MXP Jun 11, 12:10 UTCJun 11, 13:15 UTC1h 5m
2026-06-11 ABR425 MXP → LGG Jun 11, 08:55 UTCJun 11, 10:10 UTC1h 15m
2026-06-10 ABR426 LGG → MXP Jun 10, 12:05 UTCJun 10, 13:20 UTC1h 15m
2026-06-10 ABR425 MXP → LGG Jun 10, 09:05 UTCJun 10, 10:10 UTC1h 5m
2026-06-09 ABR426 LGG → MXP Jun 9, 12:00 UTCJun 9, 13:05 UTC1h 5m
2026-06-09 ABR425 MXP → LGG Jun 9, 09:25 UTCJun 9, 10:35 UTC1h 10m
2026-06-08 ABR426 LGG → MXP Jun 8, 12:20 UTCJun 8, 13:25 UTC1h 5m
2026-06-08 ABR425 MXP → LGG Jun 8, 09:05 UTCJun 8, 10:10 UTC1h 5m
2026-05-31 ABR426 LGG → MXP May 31, 12:50 UTCMay 31, 13:55 UTC1h 5m
2026-05-31 ABR425 MXP → LGG May 31, 10:10 UTCMay 31, 11:20 UTC1h 10m
2026-05-28 ABR426 LGG → MXP May 28, 11:55 UTCMay 28, 13:00 UTC1h 5m
2026-05-28 ABR425 MXP → LGG May 28, 09:00 UTCMay 28, 10:05 UTC1h 5m

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

Mode-S 4CAC66 frequently asked

What is Mode-S code 4CAC66?
4CAC66 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-AZE.
Where is Mode-S 4CAC66 registered?
Mode-S code 4CAC66 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC66 broadcasting right now?
Yes. Mode-S 4CAC66 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC66, octal 23126146, decimal 5,024,870.
What flights does 4CAC66 operate?
Mode-S 4CAC66 has broadcast 6 distinct callsigns, including ABR403, ABR402, ABR426, ABR425, ABR468.