If you have information on TCP port 53 that is not reflected on this page, simply leave a comment and we’ll update our information. Here is what we know about protocol TCP Port 53. 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. Protocol HTTP for example defines the format for communication between internet browsers and web sites. Think of it as the language spoken between computers to help them communicate more efficiently. A protocol is a set of formalized rules that explains how data is communicated over a network. TCP Port 53 may use a defined protocol to communicate depending on the application. Looking for information on Protocol TCP 53? This page will attempt to provide you with as much port information as possible on TCP Port 53.