Is there a way to recognize an application which is not in the Cisco NBAR2 dictionary ?

On Top of Cisco IWAN dictionary, eye.lo can recognize traffic based on IP, port, HTTP hostname, SSL (HTTPS) server name. The workflow is the following:

• Does the flow match an embedded eye.lo customer specific application ?
• If no match, does it belong to the Nbar2 dictionary?
• If no match, does it match with a IANA service based on well-known ports?

If no match then the flow is classified as unknown