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// Other services

Port 26133: Symbolic Computation Software Composability Protocol

Port 26133 is assigned by IANA to scscp (Symbolic Computation Software Composability Protocol).

26133

How scscp works

Other services
client:26133scscpresponse client:26133scscpresponse

The client sends a request to port 26133 and the scscp 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 26133 dangerous?

We have no specific security note for port 26133. 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 26133

ServicePortTransportDescriptionReferenceUpdated
scscp 26133 TCP, UDP Symbolic Computation Software Composability Protocol - 2007-11-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 26133, and is it reachable?

Linux

sudo ss -ltnup 'sport = :26133'      # process listening on 26133
sudo lsof -nP -i :26133

macOS

sudo lsof -nP -i :26133

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 26133 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 26133
netstat -ano | findstr :26133

From another machine

nmap -p 26133 -sV <host>
sudo nmap -sU -p 26133 <host>
nc -zv <host> 26133

Block it in the firewall

sudo ufw deny 26133/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 26133" -Direction Inbound -LocalPort 26133 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 26133 used for?

Port 26133 is assigned by IANA to scscp (Symbolic Computation Software Composability Protocol).

Is port 26133 TCP or UDP?

Port 26133 is registered for TCP and UDP.

Is it safe to open port 26133?

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 26133 is open?

On Linux run "ss -ltnup 'sport = :26133'", on macOS "lsof -nP -i :26133", and on Windows "netstat -ano | findstr :26133" to see the local process. From another machine, "nmap -p 26133 <host>" shows whether it is reachable.

05 Related
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