is there any possible way to know hosting company of a site, previously there was some name that I forgot, please post some
Usually I just go through whois sites and various other domain tool sites to retrace the name servers and stuff back to a host or datacenter
You can use this to search for the hosting company for the website http://whois.domaintools.com/vior.name
You can check the nameserver records of the domain. In general, nameserver records are including domain name of the hosting companies, may be sometimes with different extension. You can also check the IP address of the website in whois and can check it as to in which data center the website is hosted.
"What's that site running" application from Netcraft is a good tool providing Web Server, OS, IP, and Netblock Owner's information. www . netcraft . com/whats