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Port 2164 (ddns-v3)

IANA assigns port 2164 to ddns-v3: Dynamic DNS Version 3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ddns-v3 TCP Dynamic DNS Version 3 Alan Yates -
ddns-v3 UDP Dynamic DNS Version 3 Alan Yates -

Check what is listening on port 2164

Linux: is anything listening on TCP 2164?
sudo ss -tlnp 'sport = :2164'
Linux: UDP 2164
sudo ss -ulnp 'sport = :2164'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2164
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2164 '
Windows (Command Prompt)
netstat -ano | findstr :2164
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2164 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2164
From Windows
Test-NetConnection HOST -Port 2164
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2164

Block port 2164 in the firewall

ufw
sudo ufw deny 2164/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2164 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2164 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2164' -Direction Inbound -Protocol TCP -LocalPort 2164 -Action Block
ufw
sudo ufw deny 2164/udp
iptables
sudo iptables -A INPUT -p udp --dport 2164 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2164 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2164' -Direction Inbound -Protocol UDP -LocalPort 2164 -Action Block

Related ports

2162navisphere2163navisphere-sec2165x-bone-api2166iwserver

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