Hardware Firewall to block Traffic to IP Addresses of Porn Websites

Hello,

Ive been tasked to set up our FIREWALL to block based off IP Address ports. (DNS, Open DNS, Norton DNS) is not applicable, because the goal is to block to IP Addresses of Porn Websites of our users.

I noticed the Open Dns, nor Norton provide a copy of the IP Address list to download so that you can block via those, so Im thinking I have to do:

nslookup pornwebsite1.com

nslookup pornwebsite2.com

and so forth on every porn website in order to build a list of IP Addresses.

Does anyone know if there is a IP Address Listing (NOT Domain Name nor DNS listing, but rather RAW IP Addresses) for all porn websites? This is a tough scenario, but the only way I know is to do name server lookups for every single ip address in the porn.

Ideas?

The only crappy Idea I can think of is:

1. Download the Badhosts list of porn from: http://www.hostsfile.org/hosts.html (Actually the best safest Host File list which includes i-porn, is this one: https://n0where.net/the-ultimate-hosts-blacklist ).
2. Nslookup each domain name of the webserver list in that file
3. Save and block each ip address manually as a firewall rule

Help?