UDP 9

Looking for information on Protocol UDP 9? This page will attempt to provide you with as much port information as possible on UDP Port 9.

UDP Port 9 may use a defined protocol to communicate depending on the application. A protocol is a set of formalized rules that explains how data is communicated over a network. Think of it as the language spoken between computers to help them communicate more efficiently.

Protocol HTTP for example defines the format for communication between internet browsers and web sites. Another example is the IMAP protocol that defines the communication between IMAP email servers and clients or finally, the SSL protocol which states the format to use for encrypted communications.

UDP Port 9

Here is what we know about protocol UDP Port 9. If you have information on UDP port 9 that is not reflected on this page, simply leave a comment and we’ll update our information.

PORT 9 – Information

• Port Number: 9
• TCP / UDP: UDP
• Delivery: No
• Protocol / Name: discard
• Port Description: Discard. Port equiv to /dev/null. Reads pkts, then discards them. Allows knowledge the host is alive and processing pkts. Used while trouble-shooting local stack’s transmit ability (telnet to discard on remote host, knowing all transmitted keystrokes will just be discarded. no worry of corrupting host processes). No threat, but block on hosts and perimeter network devices as general rule.
• Virus / Trojan: No

  Tip! Use our free Digital Footprint and Firewall Test to help verify you are not infected.

Side note: UDP port 9 uses the Datagram Protocol, a communications protocol for the Internet network layer, transport layer, and session layer. This protocol when used over PORT 9 makes possible the transmission of a datagram message from one computer to an application running in another computer. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) but unlike TCP on Port 9, UDP Port 9 is connectionless and does not guarantee reliable communication; it’s up to the application that received the message on Port 9 to process any errors and verify correct delivery.

Because protocol UDP port 9 was flagged as a virus (colored red) does not mean that a virus is using port 9, but that a Trojan or Virus has used this port in the past to communicate.

UDP 9 – Disclaimer

We do our best to provide you with accurate information on PORT 9 and work hard to keep our database up to date. This is a free service and accuracy is not guaranteed. We do our best to correct any errors and welcome feedback!