Reverse IP Lookup also known as Reverse DNS Lookup, with it, you can view all domain names hosted on an IP Address.
There are many websites offer paid Reverse IP service, you can goolge it to get the one you want.
Bing.com is another search engine offered by Microsoft(MS) that finds and organizes the answers you need so you can make faster, more informed decisions, and it also offers Reverse IP search service, for example, if you want to find how many domain names hosted on the same IP with WPDig.com, first get the IP of it,
ping wpdig.com
and you get
75.119.217.15
then you can search the item ip:75.119.217.15 to get all the domain names.
P.S.
DomainTools can tell you how many domain names on the same IP, and you can view 3 domain names for free and pay for all domain names.
