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// Other services

Port 195: DNSIX Network Level Module Audit

Port 195 is assigned by IANA to dn6-nlm-aud (DNSIX Network Level Module Audit).

195

How dn6-nlm-aud works

Other services
client:195dn6-nlm-audresponse client:195dn6-nlm-audresponse

The client sends a request to port 195 and the dn6-nlm-aud 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 195 dangerous?

We have no specific security note for port 195. 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 195

ServicePortTransportDescriptionReferenceUpdated
dn6-nlm-aud 195 TCP, UDP DNSIX Network Level Module Audit - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 195, and is it reachable?

Linux

sudo ss -ltnup 'sport = :195'      # process listening on 195
sudo lsof -nP -i :195

macOS

sudo lsof -nP -i :195

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 195 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 195
netstat -ano | findstr :195

From another machine

nmap -p 195 -sV <host>
sudo nmap -sU -p 195 <host>
nc -zv <host> 195

Block it in the firewall

sudo ufw deny 195/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 195" -Direction Inbound -LocalPort 195 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 195 used for?

Port 195 is assigned by IANA to dn6-nlm-aud (DNSIX Network Level Module Audit).

Is port 195 TCP or UDP?

Port 195 is registered for TCP and UDP.

Is it safe to open port 195?

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 195 is open?

On Linux run "ss -ltnup 'sport = :195'", on macOS "lsof -nP -i :195", and on Windows "netstat -ano | findstr :195" to see the local process. From another machine, "nmap -p 195 <host>" shows whether it is reachable.

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