Kiwi Farms, a far-right hate site whose members viciously target and harass people online, was taken offline earlier this month.
The Daily Stormer, a neo-Nazi site, was also inaccessible on Friday morning.
"We just blocked Kiwifarms," CEO and co-founder of Cloudflare said in a tweet on Saturday.
The company has faced mounting pressure to stop providing security services to Kiwi Farms, whose users regularly dox and stalk trans people.
The attacks on streamer Keffals have renewed pressure on the internet infrastructure company to stop service to the forum.
DreamHost has allegedly asked the website best known for trolls and targeted harassment to find a new home.
Over several weeks of reporting, I came to know a person of immense talent who was also in constant, undeniable pain at the hands of the internet.