I know this service used to be available at whois.sc, nowadays you need to subscribe for $15/month in order to use this service. Is there any free alternative service our there that allows me to know the websites hosted with the same IP?
He's trying to find out:
if another domain shares the same IP he/his client is using
if so, what domain(s) are sharing the same IP
whois.sc is the only one I know that does this kind of service; and personally, I don't find it to be that useful... Its how many sites (and maybe what sites) are hosted on the same server that counts...