Port is a String property that represents the port to use for the identifer specified in URI. For example, a URI with the value "http://www.nevrona.com:80/indy/index.html" would result in Port property containing the value "80". 

Often the Port property is not used because most URI's use a default port which is indicated by the protocol, as in "http://www.nevrona.com/indy/index.html". The HTTP protocol uses port 80 by default. 

However, this value should be checked since port can be overridden by a port specified in the URI.

Host 

Document 

Path 

Protocol 

URI