Apparatus

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sensors Mode-S transponder

4CA961

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-RZC · BOEING 737 MAX 8

Hex
4CA961
Octal
23124541
Decimal
5,024,097
Country
IE
Tail
EI-RZC
Type
B38M
Broadcasting now · callsign NOS5008 · 2,150 ft
Flights observed
245
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 20:20 UTC

Current position

4CA961 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CA961 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
NOS1446 - 12 2026-06-29
NOS1350 Neos 12 2026-07-20
NOS3004 - 9 2026-07-01
NOS2542 - 8 2026-06-30
NOS4357 Neos 7 2026-04-30
NOS6876 - 6 2026-07-04
NOS66QQ - 6 2026-07-04
NOS96AR - 5 2026-06-28
NOS6589 - 5 2026-06-27
NOS7179 Neos 4 2026-06-28
NOS7005 Neos 4 2026-06-28
NOS6347 - 4 2026-07-04
NOS60EK Neos 4 2026-06-29
NOS5893 Neos 4 2026-07-03
NOS5002 - 4 2026-07-03
NOS42YV Neos 4 2026-07-03
NOS41AK - 4 2026-07-04
NOS26PY - 4 2026-06-28
NOS14NA - 4 2026-07-03
NOS13BG Neos 4 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NOS23UR BLQ → RMF Jul 26, 17:40 UTCJul 26, 20:20 UTC2h 40m
2026-07-26 NOS7619 RMF → BLQ Jul 26, 06:35 UTCJul 26, 15:30 UTC8h 55m
2026-07-25 NOS16GE RHO → VRN Jul 25, 21:10 UTCJul 25, 23:40 UTC2h 30m
2026-07-25 NOS6357 VRN → RHO Jul 25, 17:35 UTCJul 25, 19:45 UTC2h 10m
2026-07-25 NOS6906 - Jul 25, 13:20 UTCJul 25, 15:20 UTC2h 0m
2026-07-25 NOS45MD SSH → MXP Jul 25, 10:25 UTCJul 25, 12:05 UTC1h 40m
2026-07-25 NOS45MD SSH → MXP Jul 25, 10:00 UTCJul 25, 10:20 UTC20m
2026-07-25 NOS6975 CAG → VRN Jul 25, 07:45 UTCJul 25, 08:40 UTC55m
2026-07-25 NOS33RE VRN → CAG Jul 25, 05:00 UTCJul 25, 05:50 UTC50m
2026-07-24 NOS5500 VRN → RMF Jul 24, 22:30 UTCJul 25, 02:05 UTC3h 35m
2026-07-24 NOS89RJ VRN → RMF Jul 24, 16:15 UTCJul 24, 18:15 UTC2h 0m
2026-07-24 NOS51RP KGS → VRN Jul 24, 12:20 UTCJul 24, 15:00 UTC2h 40m
2026-07-24 NOS5032 VRN → JMK Jul 24, 09:05 UTCJul 24, 11:10 UTC2h 5m
2026-07-24 NOS4611 TLV → VRN Jul 24, 04:00 UTCJul 24, 07:25 UTC3h 25m
2026-07-23 NOS4610 VRN → TLV Jul 23, 22:50 UTCJul 24, 01:50 UTC3h 0m
2026-07-23 NOS4579 MAH → VRN Jul 23, 18:30 UTCJul 23, 19:40 UTC1h 10m
2026-07-23 NOS10VN VRN → MAH Jul 23, 16:05 UTCJul 23, 17:15 UTC1h 10m
2026-07-23 NOS4743 - Jul 23, 12:55 UTCJul 23, 14:15 UTC1h 20m
2026-07-23 NOS36RT VRN → PMI Jul 23, 10:05 UTCJul 23, 11:25 UTC1h 20m
2026-07-23 NOS3917 TLV → VRN Jul 23, 02:15 UTCJul 23, 05:45 UTC3h 30m
2026-07-22 NOS3916 VRN → TLV Jul 22, 21:40 UTCJul 23, 00:40 UTC3h 0m
2026-07-22 NOS8070 - Jul 22, 17:00 UTCJul 22, 18:25 UTC1h 25m
2026-07-22 NOS9050 - Jul 22, 13:20 UTCJul 22, 15:45 UTC2h 25m
2026-07-21 NOS2671 - Jul 21, 14:45 UTCJul 21, 20:55 UTC6h 10m
2026-07-21 NOS2246 VRN → MUH Jul 21, 12:35 UTCJul 21, 13:20 UTC45m
2026-07-21 NOS46JM - Jul 21, 04:45 UTCJul 21, 11:20 UTC6h 35m
2026-07-20 NOS1350 LPA → MXP Jul 20, 07:00 UTCJul 20, 17:20 UTC10h 20m
2026-07-19 NOS7929 SSH → VRN Jul 19, 21:05 UTCJul 20, 00:25 UTC3h 20m
2026-07-19 NOS7321 SSH → NAP Jul 19, 16:50 UTCJul 19, 19:15 UTC2h 25m
2026-07-19 NOS7321 SSH → NAP Jul 19, 15:15 UTCJul 19, 15:40 UTC25m
2026-07-19 NOS80AM VRN → SSH Jul 19, 05:45 UTCJul 19, 13:25 UTC7h 40m
2026-07-18 NOS18JZ SSH → VRN Jul 18, 18:45 UTCJul 18, 22:25 UTC3h 40m
2026-07-18 NOS64HC FCO → SSH Jul 18, 13:35 UTCJul 18, 15:50 UTC2h 15m
2026-07-18 NOS6146 FCO → RHO Jul 18, 09:45 UTCJul 18, 11:30 UTC1h 45m
2026-07-18 NOS6146 FCO → RHO Jul 18, 07:50 UTCJul 18, 08:15 UTC25m
2026-07-18 NOS6146 FCO → RHO Jul 18, 04:25 UTCJul 18, 06:25 UTC2h 0m
2026-07-17 NOS5030 - Jul 17, 19:45 UTCJul 17, 21:44 UTC2h 0m
2026-07-17 NOS5030 - Jul 17, 18:05 UTCJul 17, 18:29 UTC25m
2026-07-17 NOS5030 - Jul 17, 15:25 UTCJul 17, 17:09 UTC1h 45m
2026-07-17 NOS5487 HAM → FCO Jul 17, 11:55 UTCJul 17, 13:40 UTC1h 45m
2026-07-17 NOS40UX FCO → HAM Jul 17, 08:30 UTCJul 17, 10:25 UTC1h 55m
2026-07-16 NOS4864 - Jul 16, 08:50 UTCJul 16, 21:40 UTC12h 50m
2026-07-15 NOS3271 - Jul 15, 17:50 UTCJul 15, 23:00 UTC5h 10m
2026-07-15 NOS3271 - Jul 15, 16:15 UTCJul 15, 16:35 UTC20m
2026-07-15 NOS3271 - Jul 15, 09:30 UTCJul 15, 14:40 UTC5h 10m
2026-07-14 NOS2874 - Jul 14, 12:15 UTCJul 14, 15:30 UTC3h 15m
2026-07-14 NOS2874 - Jul 14, 06:10 UTCJul 14, 07:45 UTC1h 35m
2026-07-13 NOS36PC - Jul 13, 21:40 UTCJul 13, 23:05 UTC1h 25m
2026-07-13 NOS83YG MIR → DJE Jul 13, 20:15 UTCJul 13, 20:40 UTC25m
2026-07-13 NOS43MM FCO → MIR Jul 13, 18:20 UTCJul 13, 19:25 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-RZC page for operator, model, and routing details .

Mode-S 4CA961 frequently asked

What is Mode-S code 4CA961?
4CA961 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-RZC.
Where is Mode-S 4CA961 registered?
Mode-S code 4CA961 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA961 broadcasting right now?
Yes. Mode-S 4CA961 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA961, octal 23124541, decimal 5,024,097.
What flights does 4CA961 operate?
Mode-S 4CA961 has broadcast 20 distinct callsigns, including NOS1446, NOS1350, NOS3004, NOS2542, NOS4357.