Dynamic IP ban of ESThost
I would advise anyone running dynamic IP services to ban the entire IP block assigned to ESThost from Atrivo/Intercage:
69.50.160.0 - 69.50.191.255
At the very least ban anyone from pointing subdomains to any IP number in that range from now on.
There’s very little legitimate content on dyndns subdomains from that IP range. Maybe nothing. It’s possible some sites haven’t been spamvertized, or was spamvertized so long ago it’s fallen out of Google. It’s also possible some were not spamvertized, but has links from other sites that have been spamvertized. Either way, the content is bound to be spammy, ie: Porn, pills, gambling, search.
Any subdomain provider who’s willing to do this, will have significantly less spammy subdomains. It’s not going to stop spam, but will at least harm the bottom line for spammers, for a while.