How can I block a specific web site?

Running NIS v 22.9.1.12

 

There's a web site that, starting at the beginning of the month, begins downloading 'something' at about 64mbs for hours on end. I can't figure out where its data goes and it is using up bandwidth. I went from 250G usage the last few months to over 1000G since the first.

 

The site is: deploy.static.akamaitechnologies.com

and I want to prevent it from attaching to my PC for anything. However, I looked through Norton NIS options and can't find where I could block a specific site.

 

Please help, it's using up all my bandwidth.