Thanks for this very useful information.

At least you are happy now they do not disturb you.

I'd recommend installing GASP http://wordpress.org/plugins/growmap-anti-spambot-plugin/ rather than trying to blacklist a range of IP addresses. GASP adds a checkbox next to the submit button which only a human can tick so stopping robot spam, then Akismet https://my.wealthyaffiliate.com/training/protect-your-site-from-spam-use-akismet will deal with the human spammers afterwards. :) Rich.

I had a similar problem on one of my sites. Everyday, I would have to go into my admin posts section and delete users and their associated posts by up to the hundreds. Luckily, they never made it to the published site as I had mew posts set to be 'uncategorized' and I had to approve them. Nothing on the site itself referred to any 'uncategorized' post so they never showed up. I desperately sought some sort of protection. Ended up finding 'All In One WP Security'. It approaches all aspects of site security from limiting # of login attempts for brute force security, and you can set how long before another attempt can be made, simple math captchas for admin login with redirect, many more. Set once and forget. It surely saved me.
These attacks can be relentless and I thoroughly understand your frustration. Very happy for you that you found something strong enough to allow you to stay in control.

I have had a lot of traffic in Japanese leaving comments, and and attempted hack also. We need to stay current on what helps protect us.

Good to know...thanks!

Cheers. Really important that we can protect our babies!

Thank you! Appreciated...

Thanks!

Thanks
John