: Can multiple subdomains affect SEO results? The question is there is one site named: www.example.com. But the issue with site is it can open after entering whatever instead of www. e.g.: xxx.example.com

@Megan663

Setting up DNS to allow any subdomain is known as wildcard subdomains. Allowing any subdomain through this mechanism is fine for SEO as long as they redirect. My domains are all set up this way.

Since you say you have a redirect in place that will take users to the canonical www subdomain, there will be no SEO problems. It would be an SEO problem to duplicate the same site on every subdomain such that Googlebot would then find multiple copies of the site and lots of duplicate content.

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@Berryessa370

Yes, it may affect if the sub-domains point to same content pages. All you need to do is use 301 re-direct and canonical here is the link: When to use canonical? Prepaid products of different values

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