TCP 13

Looking for information on Protocol TCP 13? This page will attempt to provide you with as much port information as possible on TCP Port 13.

TCP Port 13 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.

TCP Port 13

Here is what we know about protocol TCP Port 13. If you have information on TCP port 13 that is not reflected on this page, simply leave a comment and we’ll update our information.

PORT 13 – Information

• Port Number: 13
• TCP / UDP: TCP
• Delivery: Yes
• Protocol / Name: daytime
• Port Description: Daytime. Returns the time of day in machine language; can return OS version. Provides host time, which can be useful in timing attacks. Also creates a DOS threat when its output is looped echo port (7). Disable this port on all hosts.
• Virus / Trojan: No

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

Side note: TCP port 13 uses the Transmission Control Protocol. TCP is one of the main protocols in TCP/IP networks. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and also guarantees that packets will be delivered on port 13 in the same order in which they were sent. Guaranteed communication over port 13 is the key difference between TCP and UDP. UDP port 13 would not have guaranteed communication in the same way as TCP.

Because protocol TCP port 13 was flagged as a virus (colored red) does not mean that a virus is using port 13, but that a Trojan or Virus has used this port in the past to communicate.

TCP 13 – Disclaimer

We do our best to provide you with accurate information on PORT 13 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!