go
s.dns.it has one IP number , but the reverse is it1.dnsnode.net. it1.dnsnode.net point to the same IP. it use this as a nameserver. dns.it is a domain controlled by four nameservers. Two of them are on the same IP network. Incoming mail for dns.it is handled by one mailserver at nic.it. s.dns.it is hosted on a server in Sweden even though the hostname implies Italy.

s.dns.it
a records
 
+ 194.146.106.30 194.146.106.0/24 AS8674 it1.dnsnode.net
+ --- it1.dnsnode.net

dns.it
ns-soa records
dns.nic.it
+ 192.12.192.5 192.12.192.0/24 AS2597 -
+ --- -
ns records
dns.nic.it
+ 192.12.192.5 192.12.192.0/24 AS2597 -
+ --- -
m.dns.it
+ 217.29.76.4 217.29.72.0/21 AS16004 -
c.dns.it
+ 194.0.1.22 194.0.1.0/24 AS42909 -
ns2.nic.it
+ 192.12.192.3 192.12.192.0/24 AS2597 -
mx records
relay.nic.it
+ 193.205.245.244 193.205.245.0/24 AS5602 mail.nic.it
+ --- mail.nic.it
ip numbers of host
194.146.106.30
ptrs of ip numbers
it1.dnsnode.net
hostnames sharing ip with a-records
it1.dnsnode.net
domains using this as nameserver
it