We pick m.root-servers.net, one of the 13 root servers (1), and ask it about wallis-fashion.com and learn that com is delegated to 13 name servers (2), so we ask m.gtld-servers.net where we learn that wallis-fashion.com is delegated to two name servers, including udns1.ultradns.net (3), so we ask that one and get the following answer:
The three primary mail servers smtp141, smtp240 and smtp241.caraway.co.uk together
All of the eleven domains that use primary mail server group 1 use the last resort mail server smtp140.caraway.co.uk (example: evans.co.uk, arcadia.co.uk and bhs.co.uk ). Worth noting is that all of the domains that use the last resort mail server smtp140.caraway.co.uk use primary mail server group 1.
The last resort mail server smtp140.caraway.co.uk only
All of the eleven domains that use the last resort mail server smtp140.caraway.co.uk use primary mail server group 1. Worth noting is that all of the domains that use primary mail server group 1 use the last resort mail server smtp140.caraway.co.uk.
The two name servers udns1 and udns2.ultradns.net together
There are several thousand of domains that use name server group 1.
The four mail servers smtp140, smtp141, smtp240 and smtp241.caraway.co.uk together
There are about fourty domains that use the four mail servers smtp140, smtp141, smtp240 and smtp241.caraway.co.uk together, hereafter referred to as "mail server group 1".
Three quarter of those use name server group 1 (example: topshop.co.uk, dorothyperkins.co.uk and caraway.co.uk ). Worth noting is that at least one of the domains that use name server group 1 use mail server group 1.
Half of them use only the IPv4 number 204.74.99.100 (example: bhsmenswear.co.uk ). Worth noting is that at least one of the domains that only use the IPv4 number 204.74.99.100 use mail server group 1.
Half of them point only to the IP number 204.74.99.100.
The IPv4 number 204.74.99.100 only
There are several thousand of domains that only use the IPv4 number 204.74.99.100.