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Port 4664 (ems)

IANA assigns port 4664 to ems: Rimage Messaging Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ems TCP Rimage Messaging Server David V Raskin -
ems UDP Rimage Messaging Server David V Raskin -

Registry dates for this port: registered 2006-02.

Check what is listening on port 4664

Linux: is anything listening on TCP 4664?
sudo ss -tlnp 'sport = :4664'
Linux: UDP 4664
sudo ss -ulnp 'sport = :4664'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4664
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4664 '
Windows (Command Prompt)
netstat -ano | findstr :4664
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4664 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4664
From Windows
Test-NetConnection HOST -Port 4664
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4664

Block port 4664 in the firewall

ufw
sudo ufw deny 4664/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4664 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4664 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4664' -Direction Inbound -Protocol TCP -LocalPort 4664 -Action Block
ufw
sudo ufw deny 4664/udp
iptables
sudo iptables -A INPUT -p udp --dport 4664 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4664 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4664' -Direction Inbound -Protocol UDP -LocalPort 4664 -Action Block

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