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Port 4115 (cds)

IANA assigns port 4115 to cds: CDS Transfer Agent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cds TCP CDS Transfer Agent Neil Coggins -
cds UDP CDS Transfer Agent Neil Coggins -

Registry dates for this port: registered 2006-07.

Check what is listening on port 4115

Linux: is anything listening on TCP 4115?
sudo ss -tlnp 'sport = :4115'
Linux: UDP 4115
sudo ss -ulnp 'sport = :4115'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4115
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4115 '
Windows (Command Prompt)
netstat -ano | findstr :4115
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4115 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4115
From Windows
Test-NetConnection HOST -Port 4115
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4115

Block port 4115 in the firewall

ufw
sudo ufw deny 4115/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4115 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4115 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4115' -Direction Inbound -Protocol TCP -LocalPort 4115 -Action Block
ufw
sudo ufw deny 4115/udp
iptables
sudo iptables -A INPUT -p udp --dport 4115 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4115 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4115' -Direction Inbound -Protocol UDP -LocalPort 4115 -Action Block

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