We pick b.root-servers.net, one of the 13 root servers (1), and ask it about fra07s07-in-f141.1e100.net and learn that net is delegated to 13 name servers (2), so we ask d.gtld-servers.net where we learn that 1e100.net is delegated to four name servers, including ns1.google.com (3), so we ask that one and get the following answer:
There are four host names that point to the IP number 209.85.148.141. All of those point only to that ip number and all of them use only the IPv4 number 209.85.148.141.