You are almost certainly using your ISP's DNS. I use OpenDNS for the filtering. I've got four kids and dozens of devices scattered through the house. OpenDNS k

You are almost certainly using your ISP's DNS. I use OpenDNS for the filtering. I've got four kids and dozens of devices scattered through the house. OpenDNS keeps most of the crud that I'd rather they not see out of my network and it requires zero administration when a friend comes over or a new device shows up. The other benefit of using a provider like OpenDNS is a (supposed) reduction in the time it takes to do a DNS lookup. Given how many DNS lookups I do in a day, this could add up to real time (but I've never actually tested whether it is faster or not).