We pick m.root-servers.net, one of the 13 root servers (1), and ask it about holmblad.org and learn that org is delegated to six name servers (2), so we ask d0.org.afilias-nst.org where we learn that holmblad.org is delegated to two name servers, including dyndns2.space2u.com (3), so we ask that one and get the following answer:
The two name servers dyndns1 and dyndns2.space2u.com together
More than one in eight of the more than two hundred domains that use name server group 2 point only to the IP number 62.20.1.171 (example: akademiks.se, babyphat.se and carhart.se ).