If you host your forum DNS on CloudFlare it’s possible to firewall block or JavaScript challenge those rogue bots. CF allows blocking by AS Number such as AS18978 Enzu and AS55268 Crap Shack.
This site is good to lookup IP information. When i notice a hit on my server the offenders are booted at CF before they waste my server resources.
Just a hobbyist.. I’ve learned a lot over the years. The sucks site keeps me on my toes as it’s constantly under an attack of some sort. Corporate scumbags never give up.. 
Their latest trick was using bots with spoofed smartphone ip’s to post comments on a popular vehicle fraud awareness article. That stunt resulted is bogus keywords getting indexed into Google. The damage is being reversed.
Just another day in paradise.. 
Thanks FidoSysop 😉
I can follow what you say and I have Cloudfare available to activate on my blog, but I don’t think they are bots, this is what was already been reasoned before…
But I will look better into Cloudflare, 😉
Giovnna, this plugin is good to see who is hitting your site and often shows referrer links. Requires geo location database installed that Mike has on his site.
It may not show repetitive ip’s in a block but often those kind of attackers use ip’s from multiple countries. A good tool for identifying and blocking attackers.
An example screenshot just taken.
ok thanks! At the moment the SP captcha plugin seems to work, no weird subscription for a few days! Let’s hope it’s solved or I will look into Cloudfare, thanks a lots!
Glad it is working for you. We find the captcha does the trick. And now, I am about to leave on a visit to your beautiful country… and some warmer weather I hope!
Ohhh niceee, weather is very good in the south, in Sicily 32° the other day! But maybe you won’t go that far… Enjoy! 😀
I am from Napoli! Which restaurant did you go to? 😀 I envy you, I could murder a real pizza 😀
Giovanna said
I am from Napoli! Which restaurant did you go to? 😀 I envy you, I could murder a real pizza 😀
Pizza Hut works for me.. 
Just an airport hotel as we got in so late. We are actually staying at Sorrento for a few days.