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Documentazione di Ubuntu » Guida Ubuntu Desktop » Rete, web, email e chat » Keeping safe on the internet »

# Commonly-used network ports

This is a list of network ports commonly used by applications that provide network services, like file sharing or remote desktop viewing. You can change your system's firewall to block or allow access to these applications. There are thousands of ports in use, so this table isn't complete.

Port | Name | Description
5353/udp | mDNS, Avahi | Allows systems to find each other, and describe which services they offer, without you having to specify the details manually.
631/udp | Printing | Allows you to send print jobs to a printer over the network.
631/tcp | Printing | Allows you to share your printer with other people over the network.
5298/tcp | Presence | Allows you to advertise your instant messaging status to other people on the network, such as "online" or "busy".
5900/tcp | Remote desktop | Allows you to share your desktop so other people can view it or provide remote assistance.
3689/tcp | Music sharing (DAAP) | Allows you to share your music library with others on your network.

## More Information

- Keeping safe on the internet — Antivirus software, basic firewalls...

## Confronta anche

- Enable or block firewall access — You can control which programs can access the network. This helps to keep your computer secure.