We pick h.root-servers.net, one of the 13 root servers (1), and ask it about tripadvisor.lk and learn that lk is delegated to nine name servers (2), so we ask l.nic.lk where we learn that tripadvisor.lk is delegated to two name servers, including ns3.srinetwork.com (3), so we ask that one and get the following answer:
All of the three domains that use the primary name server ns3.srinetwork.com use name server group 1. Worth noting is that three of the domains that use name server group 1 use the primary name server ns3.srinetwork.com.
The two name servers ns3 and ns4.srinetwork.com together
There are five domains that use name server group 1.
Four of those are under the tld "com".
Three of them use the primary name server ns3.srinetwork.com. Worth noting is that all of the domains that use the primary name server ns3.srinetwork.com use name server group 1.
Three of them use the primary mail server mail8.srinetwork.com and the last resort mail server.
The IPv4 number 96.125.181.175 only
There are several hundred of domains that only use the IPv4 number 96.125.181.175.