Apparatus

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sensors Mode-S transponder

4CA9A1

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-RZB · BOEING 737 MAX 8

Hex
4CA9A1
Octal
23124641
Decimal
5,024,161
Country
IE
Tail
EI-RZB
Type
B38M
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
285
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S 4CA9A1.

Country allocation

The ICAO 24-bit address 4CA9A1 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
NOS1521 Neos 11 2026-05-25
NOS7929 - 8 2026-06-28
NOS4723 - 8 2026-06-25
NOS1520 Neos 7 2026-05-25
NOS7321 - 6 2026-06-28
NOS3865 Neos 6 2026-06-03
NOS3004 - 6 2026-07-15
NOS6023 Neos 5 2026-06-13
NOS29HP Neos 5 2026-05-08
NOS1350 - 5 2026-06-29
NOS89RJ Neos 4 2026-07-03
NOS7420 Neos 4 2026-05-25
NOS69SQ Neos 4 2026-05-04
NOS5500 - 4 2026-07-03
NOS51RP Neos 4 2026-07-03
NOS5032 - 4 2026-07-03
NOS3917 Neos 4 2026-07-02
NOS3916 - 4 2026-07-01
NOS1446 - 4 2026-07-13
NOS98AT Neos 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NOS7622 CIY → VRN Jul 26, 21:20 UTCJul 26, 22:15 UTC55m
2026-07-26 NOS26PZ VRN → CIY Jul 26, 18:50 UTCJul 26, 20:15 UTC1h 25m
2026-07-26 NOS18SA PMI → VRN Jul 26, 16:20 UTCJul 26, 17:40 UTC1h 20m
2026-07-26 NOS7874 MXP → PMI Jul 26, 13:20 UTCJul 26, 15:10 UTC1h 50m
2026-07-26 NOS7061 CAG → MXP Jul 26, 08:35 UTCJul 26, 09:40 UTC1h 5m
2026-07-26 NOS63TF MXP → CAG Jul 26, 06:00 UTCJul 26, 06:55 UTC56m
2026-07-25 NOS9521 GLA → MXP Jul 25, 18:40 UTCJul 25, 20:35 UTC1h 55m
2026-07-25 NOS8521 BGY → MXP Jul 25, 15:05 UTCJul 25, 17:15 UTC2h 10m
2026-07-25 NOS36WH HAM → MXP Jul 25, 12:35 UTCJul 25, 13:55 UTC1h 20m
2026-07-25 NOS76CV MXP → HAM Jul 25, 09:50 UTCJul 25, 11:05 UTC1h 15m
2026-07-24 LAV911P TLV → MAD Jul 24, 21:00 UTCJul 24, 22:00 UTC1h 0m
2026-07-24 LAV1073 LGW → MRS Jul 24, 18:25 UTCJul 24, 20:25 UTC2h 0m
2026-07-24 LAV910P MXP → VLC Jul 24, 15:30 UTCJul 24, 17:20 UTC1h 50m
2026-07-24 NOS43LK HAM → MXP Jul 24, 12:30 UTCJul 24, 13:50 UTC1h 20m
2026-07-24 NOS564 MXP → HAM Jul 24, 09:15 UTCJul 24, 10:40 UTC1h 25m
2026-07-24 AIZ337 TLV → MXP Jul 24, 03:25 UTCJul 24, 07:10 UTC3h 45m
2026-07-23 AIZ1338 MXP → TLV Jul 23, 22:15 UTCJul 24, 01:20 UTC3h 5m
2026-07-23 NOS4538 MXP → CAI Jul 23, 13:50 UTCJul 23, 17:45 UTC3h 55m
2026-07-23 NOS4538 MXP → CAI Jul 23, 07:10 UTCJul 23, 09:55 UTC2h 45m
2026-07-22 NOS3812 SID → MXP Jul 22, 10:20 UTCJul 22, 22:50 UTC12h 30m
2026-07-21 TFL3TH RHO → AMS Jul 21, 22:20 UTCJul 22, 02:15 UTC3h 55m
2026-07-21 TFL6PV AMS → RHO Jul 21, 17:40 UTCJul 21, 20:45 UTC3h 5m
2026-07-21 TFL8WL BDS → AMS Jul 21, 10:25 UTCJul 21, 12:50 UTC2h 25m
2026-07-21 TFL9LN AMS → BDS Jul 21, 07:10 UTCJul 21, 09:20 UTC2h 10m
2026-07-20 TFL1074 HER → AMS Jul 20, 20:50 UTCJul 21, 00:05 UTC3h 15m
2026-07-20 TFL1073 - Jul 20, 16:20 UTCJul 20, 19:10 UTC2h 50m
2026-07-20 TFL094P BRU → AMS Jul 20, 14:35 UTCJul 20, 15:05 UTC30m
2026-07-20 TFL094P BRU → AMS Jul 20, 13:05 UTCJul 20, 14:30 UTC1h 25m
2026-07-19 NOS7547 - Jul 19, 16:35 UTCJul 19, 20:15 UTC3h 40m
2026-07-19 NOS97UR MXP → SSH Jul 19, 11:25 UTCJul 19, 14:40 UTC3h 15m
2026-07-19 NOS7979 CIY → MXP Jul 19, 07:25 UTCJul 19, 08:55 UTC1h 30m
2026-07-19 NOS74LA MXP → CIY Jul 19, 04:15 UTCJul 19, 05:45 UTC1h 30m
2026-07-18 NOS6391 MXP → MAH Jul 18, 21:20 UTCJul 18, 22:40 UTC1h 20m
2026-07-18 NOS6391 MXP → MAH Jul 18, 18:50 UTCJul 18, 19:10 UTC20m
2026-07-18 NOS6391 MXP → MAH Jul 18, 16:40 UTCJul 18, 17:50 UTC1h 10m
2026-07-18 NOS36WH HAM → MXP Jul 18, 12:30 UTCJul 18, 13:55 UTC1h 25m
2026-07-18 NOS76CV MXP → HAM Jul 18, 10:00 UTCJul 18, 11:20 UTC1h 20m
2026-07-17 NOS5893 AOK → MXP Jul 17, 09:55 UTCJul 17, 12:35 UTC2h 40m
2026-07-17 NOS14NA - Jul 17, 06:15 UTCJul 17, 08:10 UTC1h 55m
2026-07-15 NOS3004 RHO → BLQ Jul 15, 13:15 UTCJul 15, 15:40 UTC2h 25m
2026-07-15 NOS3004 - Jul 15, 11:35 UTCJul 15, 12:00 UTC25m
2026-07-15 NOS3004 - Jul 15, 07:25 UTCJul 15, 09:15 UTC1h 50m
2026-07-14 NOS2542 - Jul 14, 13:20 UTCJul 14, 16:55 UTC3h 35m
2026-07-14 NOS2542 - Jul 14, 06:15 UTCJul 14, 08:10 UTC1h 55m
2026-07-13 NOS1446 - Jul 13, 13:05 UTCJul 13, 23:30 UTC10h 25m
2026-07-13 NOS13BG - Jul 13, 09:15 UTCJul 13, 10:50 UTC1h 35m
2026-07-13 NOS60EK - Jul 13, 05:15 UTCJul 13, 06:40 UTC1h 25m
2026-07-12 NOS7005 HER → BLQ Jul 12, 15:15 UTCJul 12, 17:20 UTC2h 5m
2026-07-12 NOS26PY - Jul 12, 12:01 UTCJul 12, 13:55 UTC1h 55m
2026-07-12 NOS7179 RHO → BLQ Jul 12, 07:45 UTCJul 12, 10:05 UTC2h 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-RZB page for operator, model, and routing details .

Mode-S 4CA9A1 frequently asked

What is Mode-S code 4CA9A1?
4CA9A1 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-RZB.
Where is Mode-S 4CA9A1 registered?
Mode-S code 4CA9A1 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA9A1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA9A1, octal 23124641, decimal 5,024,161.
What flights does 4CA9A1 operate?
Mode-S 4CA9A1 has broadcast 20 distinct callsigns, including NOS1521, NOS7929, NOS4723, NOS1520, NOS7321.