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Port 11967 (sysinfo-sp)

IANA assigns port 11967 to sysinfo-sp: SysInfo Service Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sysinfo-sp TCP SysInfo Service Protocol Mike Cooper -
sysinfo-sp UDP SysInfo Service Protocol Mike Cooper -

Registry dates for this port: registered 2003-03.

Check what is listening on port 11967

Linux: is anything listening on TCP 11967?
sudo ss -tlnp 'sport = :11967'
Linux: UDP 11967
sudo ss -ulnp 'sport = :11967'
Linux / macOS: which process owns the port
sudo lsof -nP -i :11967
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':11967 '
Windows (Command Prompt)
netstat -ano | findstr :11967
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 11967 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 11967
From Windows
Test-NetConnection HOST -Port 11967
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 11967

Block port 11967 in the firewall

ufw
sudo ufw deny 11967/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 11967 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 11967 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 11967' -Direction Inbound -Protocol TCP -LocalPort 11967 -Action Block
ufw
sudo ufw deny 11967/udp
iptables
sudo iptables -A INPUT -p udp --dport 11967 -j DROP
nftables
sudo nft add rule inet filter input udp dport 11967 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 11967' -Direction Inbound -Protocol UDP -LocalPort 11967 -Action Block

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