301 redirect question

I want to redirect (301) all subdomains (including non-existing ones) to www.mydomain.com

I couldn't find which command I should add to my htaccess.

I can 301 redirect non-www to www. But that is not enough.

 

redirect 301 /old.htm http://www. you.com/new.htm

 

First of all, you cannot redirect requests for non-existent subdomains because those requests will never make it to your server. Without a DNS entry for the non-existent domain, a browser will have no way of getting such a request to your web server. If the request never makes it to your server, you'll have no way of returning a 301.

In regard to your existing subdomains, do you want to redirect requests for old URLs on the subdomains to the same page name on the www URL? For example, are you wanting to redirect

http://subdomain1.example.com/folder/page1.html
http://subdomain1.example.com/folder/
http://subdomain1.example.com/

to

http://www.example.com/folder/page1.html
http://www.example.com/folder/
http://www.example.com/

respectively? If so and the root folders for the subdomains are different from the root folder for the www domain then placing the following in the .htaccess files in the root of each of the subdomains should work:

RewriteRule (.*) http://www.example.com/$1 [R=301,L]

Or do you simply want to redirect the requests for URLs in the sub-domain to the root of the www domain? If so and the root folders for the subdomains are different from the root folder for the www domain then placing the following in the .htaccess files in the root of each of the subdomains should work:

RewriteRule (.*) http://www.example.com/ [R=301,L]

 

Just a note that the htaccess is very very sensitive. If you place a space in the wrong place you possible will shut down your entire site.

 

I just tried to avoid making a link.

 

Sorry but this is not related to what I am asking. This is about how to redirect an internal page.

I would like to know how I can redirect all possible subdomains to www.example.com

For example; a.example.com, b.example.com, c.example.com, ..... are redirected to www.example.com

Thanks for your reply. I know that I should add a wilcard (*) as an A record or CNAME to my name server.

Any of the both options (folder to folder or folder to homepage) above is okay for me. However I prefer to redirect folders to folders. Because currently I have the command below on my htaccess:

RewriteEngine On

RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
   RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]

Code (markup):

So, the new additional command to redirect all subdomains to www.example.com/internalpage or www.example.com
must not stop the function of already existing command above.