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Port 694 (ha-cluster)

IANA assigns port 694 to ha-cluster.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ha-cluster TCP ha-cluster Alan Robertson -
ha-cluster UDP ha-cluster Alan Robertson -

Check what is listening on port 694

Linux: is anything listening on TCP 694?
sudo ss -tlnp 'sport = :694'
Linux: UDP 694
sudo ss -ulnp 'sport = :694'
Linux / macOS: which process owns the port
sudo lsof -nP -i :694
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':694 '
Windows (Command Prompt)
netstat -ano | findstr :694
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 694 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 694
From Windows
Test-NetConnection HOST -Port 694
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 694

Block port 694 in the firewall

ufw
sudo ufw deny 694/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 694 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 694 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 694' -Direction Inbound -Protocol TCP -LocalPort 694 -Action Block
ufw
sudo ufw deny 694/udp
iptables
sudo iptables -A INPUT -p udp --dport 694 -j DROP
nftables
sudo nft add rule inet filter input udp dport 694 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 694' -Direction Inbound -Protocol UDP -LocalPort 694 -Action Block

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