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Port 4064 (ice-srouter)

IANA assigns port 4064 to ice-srouter: Ice Firewall Traversal Service (SSL).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ice-srouter TCP Ice Firewall Traversal Service (SSL) Bernard Normier -
ice-srouter UDP Ice Firewall Traversal Service (SSL) Bernard Normier -

Registry dates for this port: registered 2006-12.

Check what is listening on port 4064

Linux: is anything listening on TCP 4064?
sudo ss -tlnp 'sport = :4064'
Linux: UDP 4064
sudo ss -ulnp 'sport = :4064'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4064
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4064 '
Windows (Command Prompt)
netstat -ano | findstr :4064
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4064 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4064
From Windows
Test-NetConnection HOST -Port 4064
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4064

Block port 4064 in the firewall

ufw
sudo ufw deny 4064/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4064 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4064 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4064' -Direction Inbound -Protocol TCP -LocalPort 4064 -Action Block
ufw
sudo ufw deny 4064/udp
iptables
sudo iptables -A INPUT -p udp --dport 4064 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4064 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4064' -Direction Inbound -Protocol UDP -LocalPort 4064 -Action Block

Related ports

4062ice-slocation4063ice-router4065avanti-cdp, avanti_cdp4066pmas

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