SharePoint 2013 Host Named Site Collection Alias
 To add Alias to SharePoint 2013 Host Named Site Collection:   $site = Get-SPSite "http://x.com"  Set-SPSiteURL -Identity $site -Url "http://x1.com"  -Zone Default     and you can add up to 5 aliases and zone can be: Default, Intranet, Internet, Extranet and Custom     Reference:  http://technet.microsoft.com/en-us/library/jj219633(v=office.15).aspx