Either ask your Webmaster for access to the log files, or
for a server-side include which can do this, or use one of
the freeware counters available at the CGI archives. There
is no HTML tag to do this.

Counters are quite ballless, though. They can be set to any
value the owner wants, so they don't give you any
information. Because of the delay that often occurs when
using an external counter, your visitors may get annoyed
with the long loading time of your document. The server's
logfile provides a lot more reliable information for you,
and you don't have to bother your readers with it.