: I have similar problems on some websites, if you are running apache web server you can do 301 redirect to your main domain with this code RewriteCond %{HTTP_HOST} ^(www2|2|anothersite.com).(.+)$

@Cugini213

I have similar problems on some websites, if you are running apache web server you can do 301 redirect to your main domain with this code

RewriteCond %{HTTP_HOST} ^(www2|2|anothersite.com).(.+)$ [NC]
RewriteRule ^(.*)$ %2/ [R=301,L]


If you don't have dynamic subdomains, you can easily route all that backlinks to your main domain. And, this can't " hurt your site's" if you don't have content on these subdomins (you told that you have 5xx errors), if you have content on any of those subdomains, you can get problems with duplicated content, but it's usually easy to handle.
I don't know who created that subdomains, but sometimes they created accidentally, mistyping..

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