Apparatus

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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
No current signal · last broadcast 1d ago
Flights observed
73
Distinct callsigns
6
Country
IE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4CAC66.

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
ABR468 ASL Airlines Ireland 4 2026-05-22
ABR426 ASL Airlines Ireland 3 2026-05-28
ABR425 ASL Airlines Ireland 3 2026-05-28
ABR469 ASL Airlines Ireland 2 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-05-27 ABR426 LGG → MXP May 27, 11:55 UTCMay 27, 12:55 UTC1h 0m
2026-05-27 ABR425 MXP → LGG May 27, 09:05 UTCMay 27, 10:10 UTC1h 5m
2026-05-26 ABR426 LGG → MXP May 26, 12:05 UTCMay 26, 13:15 UTC1h 10m
2026-05-26 ABR425 MXP → LGG May 26, 09:09 UTCMay 26, 10:20 UTC1h 10m
2026-05-22 ABR468 LEJ → MXP May 22, 15:35 UTCMay 22, 16:55 UTC1h 20m
2026-05-22 ABR402 MAD → LEJ May 22, 03:45 UTCMay 22, 06:10 UTC2h 25m
2026-05-21 ABR403 LEJ → MAD May 21, 23:00 UTCMay 22, 01:20 UTC2h 20m
2026-05-21 ABR402 MAD → LEJ May 21, 03:50 UTCMay 21, 06:10 UTC2h 20m
2026-05-20 ABR403 LEJ → MAD May 20, 23:05 UTCMay 21, 01:25 UTC2h 20m
2026-05-20 ABR402 MAD → LEJ May 20, 04:10 UTCMay 20, 06:30 UTC2h 21m
2026-05-19 ABR403 LEJ → MAD May 19, 22:55 UTCMay 20, 01:20 UTC2h 25m
2026-05-19 ABR402 MAD → LEJ May 19, 03:50 UTCMay 19, 06:10 UTC2h 20m
2026-05-18 ABR403 LEJ → MAD May 18, 23:00 UTCMay 19, 01:30 UTC2h 30m
2026-05-18 ABR402 MAD → LEJ May 18, 03:40 UTCMay 18, 06:01 UTC2h 20m
2026-05-17 ABR403 LEJ → MAD May 17, 23:00 UTCMay 18, 01:35 UTC2h 35m
2026-05-17 ABR402 MAD → LEJ May 17, 03:55 UTCMay 17, 06:15 UTC2h 20m
2026-05-16 ABR403 LEJ → MAD May 16, 23:05 UTCMay 17, 01:35 UTC2h 30m
2026-05-15 ABR469 MXP → LEJ May 15, 11:20 UTCMay 15, 12:30 UTC1h 10m
2026-05-12 ABR468 LEJ → MXP May 12, 15:40 UTCMay 12, 16:55 UTC1h 15m
2026-05-12 ABR402 MAD → LEJ May 12, 04:10 UTCMay 12, 06:40 UTC2h 30m
2026-05-11 ABR402 MAD → LEJ May 11, 04:30 UTCMay 11, 06:45 UTC2h 15m
2026-05-10 ABR403 LEJ → MAD May 10, 23:09 UTCMay 11, 01:45 UTC2h 35m
2026-05-10 ABR402 MAD → LEJ May 10, 03:55 UTCMay 10, 06:04 UTC2h 10m
2026-05-09 ABR403 LEJ → MAD May 9, 23:00 UTCMay 10, 01:30 UTC2h 30m
2026-05-08 ABR402 MAD → LEJ May 8, 03:44 UTCMay 8, 05:59 UTC2h 15m
2026-05-07 ABR403 LEJ → MAD May 7, 23:05 UTCMay 8, 01:35 UTC2h 30m
2026-05-07 ABR402 MAD → LEJ May 7, 03:50 UTCMay 7, 06:10 UTC2h 20m
2026-05-06 ABR403 LEJ → MAD May 6, 23:20 UTCMay 7, 01:45 UTC2h 25m
2026-05-06 ABR402 MAD → LEJ May 6, 03:55 UTCMay 6, 06:10 UTC2h 15m
2026-05-05 ABR403 LEJ → MAD May 5, 23:05 UTCMay 6, 01:35 UTC2h 30m
2026-05-05 ABR402 MAD → LEJ May 5, 03:45 UTCMay 5, 06:00 UTC2h 15m
2026-05-04 ABR403 LEJ → MAD May 4, 23:15 UTCMay 5, 01:45 UTC2h 30m
2026-05-03 ABR402 MAD → LEJ May 3, 04:20 UTCMay 3, 06:25 UTC2h 5m
2026-05-02 ABR403 LEJ → MAD May 2, 23:00 UTCMay 3, 01:40 UTC2h 40m
2026-04-29 ABR402 MAD → LEJ Apr 29, 03:40 UTCApr 29, 05:55 UTC2h 15m
2026-04-28 ABR403 LEJ → MAD Apr 28, 23:14 UTCApr 29, 01:50 UTC2h 35m
2026-04-28 ABR402 MAD → LEJ Apr 28, 04:10 UTCApr 28, 06:25 UTC2h 15m
2026-04-27 ABR403 LEJ → MAD Apr 27, 23:10 UTCApr 28, 01:35 UTC2h 25m
2026-04-27 ABR402 MAD → LEJ Apr 27, 03:50 UTCApr 27, 06:10 UTC2h 20m
2026-04-26 ABR403 LEJ → MAD Apr 26, 23:10 UTCApr 27, 01:35 UTC2h 25m
2026-04-26 ABR402 MAD → LEJ Apr 26, 04:05 UTCApr 26, 06:25 UTC2h 20m
2026-04-25 ABR403 LEJ → MAD Apr 25, 23:15 UTCApr 26, 01:45 UTC2h 30m
2026-04-24 ABR402 MAD → LEJ Apr 24, 04:05 UTCApr 24, 06:30 UTC2h 25m
2026-04-23 ABR403 LEJ → MAD Apr 23, 23:20 UTCApr 24, 01:40 UTC2h 20m
2026-04-23 ABR402 MAD → LEJ Apr 23, 03:55 UTCApr 23, 06:20 UTC2h 25m
2026-04-22 ABR403 LEJ → MAD Apr 22, 23:15 UTCApr 23, 01:40 UTC2h 25m
2026-04-22 ABR402 MAD → LEJ Apr 22, 03:55 UTCApr 22, 06:15 UTC2h 20m
2026-04-21 ABR403 LEJ → MAD Apr 21, 23:15 UTCApr 22, 01:40 UTC2h 25m

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?
No active broadcast right now. Last signal was 1d ago.
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, ABR468, ABR426, ABR425.