Broadband provider Zen Internet is reported to have joined up as a member of the Internet Watch Foundation (IWF).
The independent broadband firm had previously been heralded for being a large UK internet provider that chose to remain separate from the foundation, however Zen Internet's name now appears on the public list of members on its website.
The IWF was established in 1996 and is an independent self-regulatory body which partners with police and government to combat child sexual abuse content online.
Its work recently expanded to include online content which could be seen to incite racial hatred.
It is believed Zen Internet's change of heart about joining the foundation had been an "ongoing project" rather than a sudden move.
Recent research by the IWF found that 27 per cent of internet users class freedom of information online as vitally important, while 65 per cent said it was "at least very important".