How do I block certain networks

[BodyAthletics]

Getting a lot of spam traffic from one internet network. How can I block this network from the site?

 

[artizhay]

These should be good starting points for you:
http://www.javascriptkit.com/howto/htaccess5.shtml
http://incredibill.me/htaccess-block-country-ips
http://www.webmasterworld.com/forum92/6459.htm

Just deny access to the IP block of the network in the root .htaccess file.

 

[konthelion]

Getting a lot of spam traffic from one internet network. How can I block this network from the site?

You can block them using .htdeny or iptables from Ip2location's country blocker. See Ip2location free firewall list for generating the IP list.