I am really interested in this too, however I could not find any indication of it in "man 5 resolver" :( You can do this with dnsmasq by using the --server opt

I am really interested in this too, however I could not find any indication of it in "man 5 resolver" :( You can do this with dnsmasq by using the --server option where you can pass individual upstream servers for different domains (in addition to the default ones read from /etc/resolv.conf): --server=/google.com/1.2.3.4 --server=/www.google.com/2.3.4.5 will send queries for *.google.com to 1.2.3.4, except *www.google.com, which will go to 2.3.4.5