AAISP don't block any ports on the Internet services we provide, we do suggest that customers use FireWalls to protect their networks.
Filtering Web Pages
We support the IWFs efforts to take down websites at source.
There is lots of software and hardware solutions available for people to filter their web browsing at their side of the network - eg hardware firewalls with content filters, or software installed on individual computers, or even using third-party services to filter your DNS requests for you.
Here are some suggestions for filtering web pages on your own network: