CyberHunter
Local dataset, no network
// Other services

Port 11967: SysInfo Service Protocol

Port 11967 is assigned by IANA to sysinfo-sp (SysInfo Service Protocol).

11967

How sysinfo-sp works

Other services
client:11967sysinfo-spresponse client:11967sysinfo-spresponse

The client sends a request to port 11967 and the sysinfo-sp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 11967 dangerous?

We have no specific security note for port 11967. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 11967

ServicePortTransportDescriptionReferenceUpdated
sysinfo-sp 11967 TCP, UDP SysInfo Service Protocol - 2003-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 11967, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11967'      # process listening on 11967
sudo lsof -nP -i :11967

macOS

sudo lsof -nP -i :11967

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11967 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11967
netstat -ano | findstr :11967

From another machine

nmap -p 11967 -sV <host>
sudo nmap -sU -p 11967 <host>
nc -zv <host> 11967

Block it in the firewall

sudo ufw deny 11967/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11967" -Direction Inbound -LocalPort 11967 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11967 used for?

Port 11967 is assigned by IANA to sysinfo-sp (SysInfo Service Protocol).

Is port 11967 TCP or UDP?

Port 11967 is registered for TCP and UDP.

Is it safe to open port 11967?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 11967 is open?

On Linux run "ss -ltnup 'sport = :11967'", on macOS "lsof -nP -i :11967", and on Windows "netstat -ano | findstr :11967" to see the local process. From another machine, "nmap -p 11967 <host>" shows whether it is reachable.

05 Related
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