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Port 3950 (namemunge)

IANA assigns port 3950 to namemunge: Name Munging.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
namemunge TCP Name Munging John C Klensin -
namemunge UDP Name Munging John C Klensin -

Registry dates for this port: registered 2004-07.

Check what is listening on port 3950

Linux: is anything listening on TCP 3950?
sudo ss -tlnp 'sport = :3950'
Linux: UDP 3950
sudo ss -ulnp 'sport = :3950'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3950
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3950 '
Windows (Command Prompt)
netstat -ano | findstr :3950
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3950 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3950
From Windows
Test-NetConnection HOST -Port 3950
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3950

Block port 3950 in the firewall

ufw
sudo ufw deny 3950/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3950 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3950 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3950' -Direction Inbound -Protocol TCP -LocalPort 3950 -Action Block
ufw
sudo ufw deny 3950/udp
iptables
sudo iptables -A INPUT -p udp --dport 3950 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3950 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3950' -Direction Inbound -Protocol UDP -LocalPort 3950 -Action Block

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