whatportis.com

Port 31282 services

2 entries are registered on port 3128. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.

entries
2

services registered on this number

transport
tcp

1 transport in use

in transit
0/2

entries encrypted on the wire

worst risk
4/10

0 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:3128Tatsoft Default HTTP Proxycaution
:3128Squid Proxy HTTPcaution

01Tatsoft Default HTTP Proxytcp · unofficial · risk 4/10

Port 3128 is commonly associated with HTTP proxy services, such as those configured as default client connections in industrial automation platforms like Tatsoft. It serves as an intermediary port facilitating client communication, content filtering, or network access control, enabling efficient data transfer and protocol management for connected client applications. This port is frequently used by transparent and explicit proxy servers in enterprise or industrial environments.

port 3128 as Tatsoft Default HTTP Proxy →

02Squid Proxy HTTPtcp · unofficial · risk 4/10

Port 3128 is commonly used by proxy servers, notably Squid, for handling HTTP web caching and proxy services. It enables improved web performance by caching frequently accessed content and provides anonymity and filtering capabilities for clients accessing the internet through the proxy.

port 3128 as Squid Proxy HTTP →
filed underWeb ServicesNetwork ServicesSecurity

Which one is on your host

ask the machine, not the registry

The registry says what 3128 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.

linux
ss -ltnp | grep ':3128\b'
macos
lsof -nP -iTCP:3128 -sTCP:LISTEN
windows
netstat -ano | findstr :3128

On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.

A port number is not a service. Anything may listen on 3128 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.

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