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Port 164 (cmip-agent)

IANA assigns port 164 to cmip-agent: CMIP/TCP Agent.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
cmip-agent TCP CMIP/TCP Agent Amatzia Ben Artzi -
cmip-agent UDP CMIP/TCP Agent Amatzia Ben Artzi -

Check what is listening on port 164

Linux: is anything listening on TCP 164?
sudo ss -tlnp 'sport = :164'
Linux: UDP 164
sudo ss -ulnp 'sport = :164'
Linux / macOS: which process owns the port
sudo lsof -nP -i :164
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':164 '
Windows (Command Prompt)
netstat -ano | findstr :164
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 164 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 164
From Windows
Test-NetConnection HOST -Port 164
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 164

Block port 164 in the firewall

ufw
sudo ufw deny 164/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 164 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 164 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 164' -Direction Inbound -Protocol TCP -LocalPort 164 -Action Block
ufw
sudo ufw deny 164/udp
iptables
sudo iptables -A INPUT -p udp --dport 164 -j DROP
nftables
sudo nft add rule inet filter input udp dport 164 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 164' -Direction Inbound -Protocol UDP -LocalPort 164 -Action Block

Related ports

162SNMP trap163cmip-man165xns-courier166s-net

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