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// Other services

Port 3393: D2K Tapestry Client to Server

Port 3393 is assigned by IANA to d2k-tapestry1 (D2K Tapestry Client to Server).

3393

How d2k-tapestry1 works

Other services
client:3393d2k-tapestry1response client:3393d2k-tapestry1response

The client sends a request to port 3393 and the d2k-tapestry1 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 3393 dangerous?

We have no specific security note for port 3393. 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 3393

ServicePortTransportDescriptionReferenceUpdated
d2k-tapestry1 3393 TCP, UDP D2K Tapestry Client to Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3393, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3393'      # process listening on 3393
sudo lsof -nP -i :3393

macOS

sudo lsof -nP -i :3393

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3393 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3393
netstat -ano | findstr :3393

From another machine

nmap -p 3393 -sV <host>
sudo nmap -sU -p 3393 <host>
nc -zv <host> 3393

Block it in the firewall

sudo ufw deny 3393/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3393" -Direction Inbound -LocalPort 3393 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3393 used for?

Port 3393 is assigned by IANA to d2k-tapestry1 (D2K Tapestry Client to Server).

Is port 3393 TCP or UDP?

Port 3393 is registered for TCP and UDP.

Is it safe to open port 3393?

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 3393 is open?

On Linux run "ss -ltnup 'sport = :3393'", on macOS "lsof -nP -i :3393", and on Windows "netstat -ano | findstr :3393" to see the local process. From another machine, "nmap -p 3393 <host>" shows whether it is reachable.

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