Is it possible that a website that is opening with using www and with out www can have different page rank..?

[Khusabu]

For ex
http://www.example.com
and
example.com

[Jake]

Yes it's possible, the www is really treated like a subdomain, the same as Blog.example.com

Search ranking divided between the 2 versions dilutes the ranking, by all means make use only one of the 2 forms consistently.

To encourage people to crate bookmarks and backlinks for your preferred form, force the preferred format to be displayed, some web hosting control panels have settings to switch the www as needed, otherwise an .htaccess file script can do the job.

That is with such scripting someone accessing example.com would see http://www.example.com in the address bar (or visa versa if you choose)

[Richard]

Yes. While Google is trying its best to improve their metrics, they made it clear that a www and non www version of your site may be treated differently. In fact, having two separate version means you link potentials(or authority) is also split into two (not necessarily split equally). This is why the principle of canonicalization should be followed where you specify the URL you prefer.

There are many ways to notify Google of you preferred URL so that a single version enjoys all the link juice. For a start, you can use a 301 redirect in your htaccess file, simply add the following code:

Redirect non-www to www

Copy this code to .htaccess file.

[css]

# Always use www in the domain
# Replace ‘domain.com’ with your domain name
RewriteEngine on
RewriteCond %{HTTP_HOST} ^([a-z.]+)?domain\.com$ [NC]
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule .? http://www.%1domain.com%{REQUEST_URI} [R=301,L]

[/css]

Replace domain.com with your domain name.

Redirect www to non-www:

Copy this code to .htaccess file.

[css]

# Never use www in the domain
# Replace ‘domain.com’ with your domain name
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.(([a-z0-9_]+\.)?domain\.com)$ [NC]
RewriteRule .? http://%1%{REQUEST_URI} [R=301,L]

[/css]

In Google webmaster tools, you can set the preferred URL. but there is a trick: you need to claim and verify both the www and non www version as if they are 2 different sites.. Then choose what you prefer on the settings area.

Finally, when promoting or doing SEO, stick to just one version.

[Dorothy]

No it is not possible that a website that is opening with using www and with out www can have different page rank.

[Charles Williams]

no it's not possible, both are the same.

[Smita]

Yes it is possible as from Google point of view these are two different pages thats why canonical issue is not good as SEO perspective.

[Snehal]

no never...