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Port 64 (covia)

IANA assigns port 64 to covia: Communications Integrator (CI).

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
covia TCP Communications Integrator (CI) Dan Smith -
covia UDP Communications Integrator (CI) Dan Smith -

Check what is listening on port 64

Linux: is anything listening on TCP 64?
sudo ss -tlnp 'sport = :64'
Linux: UDP 64
sudo ss -ulnp 'sport = :64'
Linux / macOS: which process owns the port
sudo lsof -nP -i :64
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':64 '
Windows (Command Prompt)
netstat -ano | findstr :64
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 64 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 64
From Windows
Test-NetConnection HOST -Port 64
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 64

Block port 64 in the firewall

ufw
sudo ufw deny 64/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 64 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 64 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 64' -Direction Inbound -Protocol TCP -LocalPort 64 -Action Block
ufw
sudo ufw deny 64/udp
iptables
sudo iptables -A INPUT -p udp --dport 64 -j DROP
nftables
sudo nft add rule inet filter input udp dport 64 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 64' -Direction Inbound -Protocol UDP -LocalPort 64 -Action Block

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