www.xxx.com has one IP record.
net.www.xxx.com are subdomains to this hostname.
xxx.com is delegated to two nameservers, however both delegated nameservers are missing in the zone and two extra nameservers are listed. Some of them are on the same IP network. Incoming mail for
xxx.com is handled by one mailserver at
xxx.com themselves.
xxx.com has one IP record.