We pick f.root-servers.net, one of the 13 root servers (1), and ask it about www.liw.fr and learn that fr is delegated to five name servers (2), so we ask f.ext.nic.fr where we learn that liw.fr is delegated to two name servers, including ns2.parkingcrew.net (3), so we ask that one and get the following answer:
The two name servers ns1 and ns2.parkingcrew.net together
Most of the more than hundred domains that use name server group 1 point only to the IP number 62.116.181.27 (example: datingpenpals.com, fluar.com and gt-bikes.com ). Worth noting is that all of the host names that point only to the IP number 62.116.181.27 use name server group 1.