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// Other services

Port 9281: SofaWare transport port 1

Port 9281 is assigned by IANA to swtp-port1 (SofaWare transport port 1).

9281

How swtp-port1 works

Other services
client:9281swtp-port1response client:9281swtp-port1response

The client sends a request to port 9281 and the swtp-port1 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 9281 dangerous?

We have no specific security note for port 9281. 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 9281

ServicePortTransportDescriptionReferenceUpdated
swtp-port1 9281 TCP, UDP SofaWare transport port 1 - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 9281, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9281'      # process listening on 9281
sudo lsof -nP -i :9281

macOS

sudo lsof -nP -i :9281

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9281 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9281
netstat -ano | findstr :9281

From another machine

nmap -p 9281 -sV <host>
sudo nmap -sU -p 9281 <host>
nc -zv <host> 9281

Block it in the firewall

sudo ufw deny 9281/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9281" -Direction Inbound -LocalPort 9281 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9281 used for?

Port 9281 is assigned by IANA to swtp-port1 (SofaWare transport port 1).

Is port 9281 TCP or UDP?

Port 9281 is registered for TCP and UDP.

Is it safe to open port 9281?

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 9281 is open?

On Linux run "ss -ltnup 'sport = :9281'", on macOS "lsof -nP -i :9281", and on Windows "netstat -ano | findstr :9281" to see the local process. From another machine, "nmap -p 9281 <host>" shows whether it is reachable.

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