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Port 672 (vpps-qua)

IANA assigns port 672 to vpps-qua: VPPS-QUA.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
vpps-qua TCP VPPS-QUA - -
vpps-qua UDP VPPS-QUA - -

Check what is listening on port 672

Linux: is anything listening on TCP 672?
sudo ss -tlnp 'sport = :672'
Linux: UDP 672
sudo ss -ulnp 'sport = :672'
Linux / macOS: which process owns the port
sudo lsof -nP -i :672
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':672 '
Windows (Command Prompt)
netstat -ano | findstr :672
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 672 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 672
From Windows
Test-NetConnection HOST -Port 672
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 672

Block port 672 in the firewall

ufw
sudo ufw deny 672/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 672 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 672 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 672' -Direction Inbound -Protocol TCP -LocalPort 672 -Action Block
ufw
sudo ufw deny 672/udp
iptables
sudo iptables -A INPUT -p udp --dport 672 -j DROP
nftables
sudo nft add rule inet filter input udp dport 672 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 672' -Direction Inbound -Protocol UDP -LocalPort 672 -Action Block

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