Port 6640 (ovsdb)

IANA assigns port 6640 to ovsdb: Open vSwitch Database protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

ovsdb TCP Open vSwitch Database protocol Bruce Davie 2 RFC 7047

Registry dates for this port: registered 2013-07-31.

Linux: is anything listening on TCP 6640?

sudo ss -tlnp 'sport = :6640'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6640

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6640 '

Windows (Command Prompt)

netstat -ano | findstr :6640

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6640 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 6640

From Windows

Test-NetConnection HOST -Port 6640

ufw

sudo ufw deny 6640/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6640 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6640 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6640' -Direction Inbound -Protocol TCP -LocalPort 6640 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.