CloudFlare makes software which prevents denial of service attacks, which are Anonymous’ weapon of choice to take down websites.
The startup site serves more than four million customers, helping to defend against cyber-attacks and speeding up website loading times.
But a recent Anonymous has accused CloudFlare of protecting up to 40 websites linked to terrorism.
Posting on Twitter, Anonymous wrote: ‘Once again, @CloudFlare have been found to be providing services to pro #IslamicState websites. Shameful #OpISIS #Daesh #Anonymous.
Matthew Prince, CloudFlare CEO and founder, has since dismissed the claims as ‘armchair analysis’ and added that Anonymous uses it for some of its sites, despite pressure from some quarters for it to take Anonymous sites online.
Prince added that he would fully co-operate with any federal authorities who may wish to pursue the claims made by Anonymous.
“Even if we were hosting sites for ISIS, it wouldn’t be of any use to us. I should imagine those kinds of people pay with stolen credit cards and so that’s a negative for us.”
In 2013, the site faced similar accusations when they were accused of protecting a website linked to Al-Qaeda.
At the time Prince said CloudFlare was ‘protecting free speech’.
“A website is speech. It is not a bomb. There is no imminent danger it creates and no provider has an affirmative obligation to monitor and make determinations about the theoretically harmful nature of speech a site may contain”, he said.
‘If we were to receive a valid court order that compelled us to not provide service to a customer then we would comply with that court order.’