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// Other services

Port 3291: S A Holditch & Associates - LM

Port 3291 is assigned by IANA to sah-lm (S A Holditch & Associates - LM).

3291

How sah-lm works

Other services
client:3291sah-lmresponse client:3291sah-lmresponse

The client sends a request to port 3291 and the sah-lm 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 3291 dangerous?

We have no specific security note for port 3291. 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 3291

ServicePortTransportDescriptionReferenceUpdated
sah-lm 3291 TCP, UDP S A Holditch & Associates - LM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3291, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3291'      # process listening on 3291
sudo lsof -nP -i :3291

macOS

sudo lsof -nP -i :3291

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3291 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3291
netstat -ano | findstr :3291

From another machine

nmap -p 3291 -sV <host>
sudo nmap -sU -p 3291 <host>
nc -zv <host> 3291

Block it in the firewall

sudo ufw deny 3291/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3291" -Direction Inbound -LocalPort 3291 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3291 used for?

Port 3291 is assigned by IANA to sah-lm (S A Holditch & Associates - LM).

Is port 3291 TCP or UDP?

Port 3291 is registered for TCP and UDP.

Is it safe to open port 3291?

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 3291 is open?

On Linux run "ss -ltnup 'sport = :3291'", on macOS "lsof -nP -i :3291", and on Windows "netstat -ano | findstr :3291" to see the local process. From another machine, "nmap -p 3291 <host>" shows whether it is reachable.

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