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// Other services

Port 3256: Compaq RPM Agent Port

Port 3256 is assigned by IANA to cpqrpm-agent (Compaq RPM Agent Port).

3256

How cpqrpm-agent works

Other services
client:3256cpqrpm-agentresponse client:3256cpqrpm-agentresponse

The client sends a request to port 3256 and the cpqrpm-agent service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3256 dangerous?

We have no specific security note for port 3256. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3256

ServicePortTransportDescriptionReferenceUpdated
cpqrpm-agent 3256 TCP, UDP Compaq RPM Agent Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3256, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3256'      # process listening on 3256
sudo lsof -nP -i :3256

macOS

sudo lsof -nP -i :3256

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3256 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3256
netstat -ano | findstr :3256

From another machine

nmap -p 3256 -sV <host>
sudo nmap -sU -p 3256 <host>
nc -zv <host> 3256

Block it in the firewall

sudo ufw deny 3256/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3256" -Direction Inbound -LocalPort 3256 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3256 used for?

Port 3256 is assigned by IANA to cpqrpm-agent (Compaq RPM Agent Port).

Is port 3256 TCP or UDP?

Port 3256 is registered for TCP and UDP.

Is it safe to open port 3256?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 3256 is open?

On Linux run "ss -ltnup 'sport = :3256'", on macOS "lsof -nP -i :3256", and on Windows "netstat -ano | findstr :3256" to see the local process. From another machine, "nmap -p 3256 <host>" shows whether it is reachable.

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