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Port 3318 (ssrip)

IANA assigns port 3318 to ssrip: Swith to Swith Routing Information Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ssrip TCP Swith to Swith Routing Information Protocol Baba Hidekazu -
ssrip UDP Swith to Swith Routing Information Protocol Baba Hidekazu -

Check what is listening on port 3318

Linux: is anything listening on TCP 3318?
sudo ss -tlnp 'sport = :3318'
Linux: UDP 3318
sudo ss -ulnp 'sport = :3318'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3318
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3318 '
Windows (Command Prompt)
netstat -ano | findstr :3318
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3318 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3318
From Windows
Test-NetConnection HOST -Port 3318
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3318

Block port 3318 in the firewall

ufw
sudo ufw deny 3318/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3318 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3318 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3318' -Direction Inbound -Protocol TCP -LocalPort 3318 -Action Block
ufw
sudo ufw deny 3318/udp
iptables
sudo iptables -A INPUT -p udp --dport 3318 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3318 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3318' -Direction Inbound -Protocol UDP -LocalPort 3318 -Action Block

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