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Port 31016 (ka-sddp, ka-kdp)

IANA assigns port 31016 to ka-sddp, ka-kdp: Kollective Agent Secure Distributed Delivery Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ka-sddp TCP Kollective Agent Secure Distributed Delivery Protocol Kollective Technology Inc -
ka-kdp UDP Kollective Agent Kollective Delivery Protocol Kollective Technology Inc -

Registry dates for this port: registered 2016-12-11.

Check what is listening on port 31016

Linux: is anything listening on TCP 31016?
sudo ss -tlnp 'sport = :31016'
Linux: UDP 31016
sudo ss -ulnp 'sport = :31016'
Linux / macOS: which process owns the port
sudo lsof -nP -i :31016
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':31016 '
Windows (Command Prompt)
netstat -ano | findstr :31016
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 31016 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 31016
From Windows
Test-NetConnection HOST -Port 31016
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 31016

Block port 31016 in the firewall

ufw
sudo ufw deny 31016/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 31016 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 31016 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 31016' -Direction Inbound -Protocol TCP -LocalPort 31016 -Action Block
ufw
sudo ufw deny 31016/udp
iptables
sudo iptables -A INPUT -p udp --dport 31016 -j DROP
nftables
sudo nft add rule inet filter input udp dport 31016 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 31016' -Direction Inbound -Protocol UDP -LocalPort 31016 -Action Block

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