Creating new HOST NAME BASED SITECOLLECTION In SharePoint 2010
Step1:
New-SPSite -url http://contoso.customer1.com -HostHeaderWebApplication http://webapplicationname/ -Name "TestingDemoApp" -Template
sts#0 -OwnerAlias Domain Name \UserName
New-SPSite -url
http://contoso.customer2.com -HostHeaderWebApplication http://webapplicationname/ -Name "Testing Demo App 2 "
-Template sts#0 -OwnerAlias Domain Name\UserName
Step2:
Include the newly created Site Collection details in the Bindings section of IIS.
That's Now you can able to access the newly created Host Name Based Site collections.