How to remove a sub domain from Google Index!

[anand2010]

Hello, I have a website having many subdomains having same copy of content i think its harming my SEO for that site since abc and xyz sub domains do have same contents.

Thus i require to know i have already deleted required subdomain DNS RECORDS now how to have those pages removed from Google index as  well ?

The DNS Records no more exists for those subdomains already.

[Alex-Harford]

You could 301 redirect those subdomains to your preferred copy of the content. That way, you'll keep the link juice and Google's index will eventually be updated.

Alternatively, are you registered with Google Webmaster Tools? I've never had to remove a URL but I believe you can do it through that.

[anand2010]

Can i do 301 redirect of such sub domain to my www.domain.com  to get link juice to homepage will it be good idea ? Is it good to redirect a subdomain to homepage url if that donot exists anymore?

Will it cause any google issue or it shall be Google friendly ?

[Alex-Harford]

If you have nowhere more appropriate to redirect to I don't see a problem redirecting to the homepage.

[KeriMorgret]

If the site were still up, you could verify it in Google Webmaster Tools, put up a robots.txt for that subdomain that excludes crawlers from crawling anything, then go into GWT and request the entire subdomain be removed.