Method : All domain.se + http://www.domain.se were resolved and mapped into corresponding AS number and then counted.
ns1.loopia.se has the most .SE (Sweden) domain names pointed to it (over 220000).
The single most “crowded” (hosts pointing to that IP) IP according to our index is 18.104.22.168 which belongs to GoDaddy. There are 2679693 hosts (*.domain.tld) that points to that single IP. It is surely used as shared hosting and acts as a load balancer for *several* webservers.
Visit DNSDigger.com for reverse IP/host/Adsense index.