Port Usage

For each of the HTML documents in our data set, we extracted the port number used to access the document. We analyzed the distribution of port numbers. While 418 unique ports were observed, six ports accounted for over 98% of the documents. The table below presents the most popular ports.

Port Usage
Category Port % of Docs
Standard 80 93.6%
< 1024 70 0.3%
>= 1024 8000 0.5%
8001 0.5%
8080 0.7%
8888 2.8%

Port Usage
Category	Port	% of Docs
Standard	80	93.6%
< 1024	70	0.3%
>= 1024	8000	0.5%
8001	0.5%
8080	0.7%
8888	2.8%

Port 80, the standard HTTP port, was used for approximately 94% of the documents. Port 70 (the standard Gopher port) was used for approximately 0.3% of the documents (this number is slightly lower than the 1% usage of port 70 observed in our earlier data set). We checked many of the documents being served from port 70; all the ones we examined were in fact HTML documents. Ports 8000, 8001, and 8080, and 8888 accounted for the majority of the remaining documents. The strong preference for ``8'' and ``80'' in the non-standard ports is presumably related to the standard port number ``80''