Edit: This question probably doesn't make much sense, in light of the consensus of answers over in this question.


My best understanding (which isn't great) is that most search engines will treat subdomains as separate from one another and from the raw domain. So links to pages on aaa.example.com do not help the page rank of pages on bbb.example.com or on example.com. That makes sense for (say) blogspot, where the subdomains are for completely different, unrelated blogs.

Is there a way to tell the engines that the subdomains are related and should be lumped together? Some meta tag, for instance, telling the engine that pages from aaa.example.com and bbb.example.com really are part of example.com? (That specific mechanism would be open to abuse and so I assume it hasn't been implemented or at least not without there being more to it — it's just an illustration.)

  • Can you explain what you mean when you say "lumped together"? Are you trying to affect the way in which the search engine displays your site in a search results page / list, or something else? Hugo Rodger-Brown over 6 years ago
  • @Hugo: The basic goal is not to have the site's overall reputation (for lack of a better word) harmed by splitting the content across subdomains. It may be a very stupid question, depending partially on the answer to my other question here: http://doctype.com/surprisingly-basic-seo-question T.J. Crowder over 6 years ago

2 answers

seo 0
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see canonical urls and seo moz on canonical urls

Answered over 6 years ago by seo
  • Thanks. That's for duplicated content, though, isn't it? Not related, non-duplicate content. T.J. Crowder over 6 years ago
Ste4lth 28
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I'd assume not, since it would be open to abuse. Search engines rank pages based on content, as well as several other factors, so subdomains are treated as another raw page.

Answered over 6 years ago by Ste4lth
  • A well-designed system wouldn't necessarily be open to abuse, I wouldn't think. For instance, if `aaa` had a record pointing to the raw domain *and vice-versa*, then it's clear that the owners of both consider them..."combined" for lack of a better term. T.J. Crowder over 6 years ago