There's nothing stopping you from adding multiple A records for a domain. In fact, that's what a lot of people do: dig a www.google.com www.google.com.

There's nothing stopping you from adding multiple A records for a domain. In fact, that's what a lot of people do: dig a www.google.com www.google.com. 300 IN A 74.125.237.178 www.google.com. 300 IN A 74.125.237.177 www.google.com. 300 IN A 74.125.237.176 www.google.com. 300 IN A 74.125.237.179 www.google.com. 300 IN A 74.125.237.180 Browsers these days will resolve and try each one, on a first-come-first-served basis. If one fails, it will try the request on the next server.