We pick a.root-servers.net, one of the 13 root servers (1), and ask it about romcompressor.ro and learn that ro is delegated to six name servers (2), so we ask ns.uu.net where we learn that romcompressor.ro is delegated to four name servers, including ns3.romarg.com (3), so we ask that one and get the following answer:
All of the about a hundred domains that use the primary name server ns1.romarg.com use name server group 1 (example: dvideo.ro, test.ro and bytecity.ro ). Worth noting is that most of the domains that use name server group 1 use the primary name server ns1.romarg.com.
The four name servers ns1, ns2, ns3 and ns4.romarg.com together
There are about a hundred domains that use name server group 1.
The two last resort mail servers aspmx2 and aspmx3.googlemail.com together
Most of the several thousand of domains that use last resort mail server group 1 use the primary mail server aspmx.l.google.com (example: the-lick.com, goalpha.com and antonioferreira.lel.br ). Worth noting is that one quarter of the domains that use the primary mail server aspmx.l.google.com use last resort mail server group 1.
The IPv4 number 89.42.216.154 only
There are more than hundred domains that only use the IPv4 number 89.42.216.154.
One quarter of them use last resort mail server group 1 (example: ifon.se, noisepop.com and mycityjob.com ). Worth noting is that most of the domains that use last resort mail server group 1 use the primary mail server aspmx.l.google.com.
