List Courtesy of DNSServerList.org
DNSServerList.org health server, each server is tested for loading and is updated as the preferred server ie server1 server2 server3 by a rolling 24 hour load period. Using the JavaScript will allow your site to be dynamically updated with the current servers. We include three servers as some routers (esp Linksys) will pull a third server from the WAN DHCP settings which can poision the DNS cache on the router. In other words if you can provide three DNS slots then fill them all.