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// Other services

Port 266: SCSI on ST

Port 266 is assigned by IANA to sst (SCSI on ST).

266

How sst works

Other services
client:266sstresponse client:266sstresponse

The client sends a request to port 266 and the sst 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 266 dangerous?

We have no specific security note for port 266. 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 266

ServicePortTransportDescriptionReferenceUpdated
sst 266 TCP, UDP SCSI on ST - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 266, and is it reachable?

Linux

sudo ss -ltnup 'sport = :266'      # process listening on 266
sudo lsof -nP -i :266

macOS

sudo lsof -nP -i :266

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 266 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 266
netstat -ano | findstr :266

From another machine

nmap -p 266 -sV <host>
sudo nmap -sU -p 266 <host>
nc -zv <host> 266

Block it in the firewall

sudo ufw deny 266/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 266" -Direction Inbound -LocalPort 266 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 266 used for?

Port 266 is assigned by IANA to sst (SCSI on ST).

Is port 266 TCP or UDP?

Port 266 is registered for TCP and UDP.

Is it safe to open port 266?

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 266 is open?

On Linux run "ss -ltnup 'sport = :266'", on macOS "lsof -nP -i :266", and on Windows "netstat -ano | findstr :266" to see the local process. From another machine, "nmap -p 266 <host>" shows whether it is reachable.

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