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Port 195 (dn6-nlm-aud)

IANA assigns port 195 to dn6-nlm-aud: DNSIX Network Level Module Audit.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dn6-nlm-aud TCP DNSIX Network Level Module Audit - -
dn6-nlm-aud UDP DNSIX Network Level Module Audit - -

Check what is listening on port 195

Linux: is anything listening on TCP 195?
sudo ss -tlnp 'sport = :195'
Linux: UDP 195
sudo ss -ulnp 'sport = :195'
Linux / macOS: which process owns the port
sudo lsof -nP -i :195
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':195 '
Windows (Command Prompt)
netstat -ano | findstr :195
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 195 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 195
From Windows
Test-NetConnection HOST -Port 195
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 195

Block port 195 in the firewall

ufw
sudo ufw deny 195/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 195 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 195 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 195' -Direction Inbound -Protocol TCP -LocalPort 195 -Action Block
ufw
sudo ufw deny 195/udp
iptables
sudo iptables -A INPUT -p udp --dport 195 -j DROP
nftables
sudo nft add rule inet filter input udp dport 195 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 195' -Direction Inbound -Protocol UDP -LocalPort 195 -Action Block

Related ports

193srmp194IRC (IANA)196dn6-smm-red197dls

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.