Ca (the tld of Canada) is a domain controlled by nine domain name servers at isc-sns.net, isc.org and ca-servers.ca having a total of 13 IP numbers. All 13 of them are on different IP networks.
Org.nr, uiowa.net, net.sb, resource.org, castafile.com and at least 97 other hosts share name servers with this domain. Ac.cr, crnet.cr, fi.cr, nic.cr, go.cr and at least five other hosts share name servers under another name with this domain. Michaelbull.ca, ripefruit.ca, citenissan.ca, hosetech.ca, cityofcompton.ca and at least 95 other hosts are hosts under this domain. Ca.pn, ca.tv, ca.co, ca.gov, ca.gs and at least 145 other hosts are similar domain names.
Also check www.ca.
Seven of the eleven domains that use the name server tld.isc-sns.net use the six name servers tld.isc-sns.com, dns.nic.cr, secundario.nic.cr, tld.isc-sns.info, tld.isc-sns.net and cr.cctld.authdns.ripe.net together (example: sa.cr, ed.cr and or.cr ).
There are several hundred of domains that use the name server sns-pb.isc.org.
ns3.nic.fr, sec1.apnic.net, sec3.apnic.net, tinnie.arin.net, sns-pb.isc.org and pri.authdns.ripe.net together (example: 1.0.193.in-addr.arpa, 217.in-addr.arpa and 213.in-addr.arpa ).sns-pb.isc.org and ns1.media.org together (example: 15nanoseconds.net, 246.62.204.in-addr.arpa and invisible.net ).dns.bsdhost.net and sns-pb.isc.org together (example: kaslist.com, wittylink.com and kasmail.com ).