We had to block the whole range of IPs of this dangerous network from France, using .htaccess. We were gettings hundreds of spam and hack attempts from them daily. We wrote about this French “network” here.
Here is what to add (or merge the “deny” only IPs) in your .htaccess …
Checking our logs from 2016 (and now of 2017 and 2018), we see thousands of hacking attempts from OVH SAS (Yes France again. What is going on with French Hosting providers, i wonder ….). They mainly target WordPress sites, searching for plugin vulnerabilities or trying to create spam accounts.
The last months i had thousands of hacking attempts to login to my WordPress admin account. Half of them were from Russia and Ukraine, some from USA, some from UK and MOSTLY from a specific IPs from Germany, belonging to Leaseweb.com.