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// Other services

Port 3257: Compaq RPM Server Port

Port 3257 is assigned by IANA to cpqrpm-server (Compaq RPM Server Port).

3257

How cpqrpm-server works

Other services
client:3257cpqrpm-serverresponse client:3257cpqrpm-serverresponse

The client sends a request to port 3257 and the cpqrpm-server 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 3257 dangerous?

We have no specific security note for port 3257. 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 3257

ServicePortTransportDescriptionReferenceUpdated
cpqrpm-server 3257 TCP, UDP Compaq RPM Server Port - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3257, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3257'      # process listening on 3257
sudo lsof -nP -i :3257

macOS

sudo lsof -nP -i :3257

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3257 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3257
netstat -ano | findstr :3257

From another machine

nmap -p 3257 -sV <host>
sudo nmap -sU -p 3257 <host>
nc -zv <host> 3257

Block it in the firewall

sudo ufw deny 3257/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3257" -Direction Inbound -LocalPort 3257 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3257 used for?

Port 3257 is assigned by IANA to cpqrpm-server (Compaq RPM Server Port).

Is port 3257 TCP or UDP?

Port 3257 is registered for TCP and UDP.

Is it safe to open port 3257?

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 3257 is open?

On Linux run "ss -ltnup 'sport = :3257'", on macOS "lsof -nP -i :3257", and on Windows "netstat -ano | findstr :3257" to see the local process. From another machine, "nmap -p 3257 <host>" shows whether it is reachable.

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