www versus non www

Is there any pros and cons for standardizing the website URL links to be www versus non www?
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Julian HansenCommented:
It is not that simple. When you setup a domain you have to setup various DNS records for that domain. These records help to route traffic to the correct destination so you might have


Each of the above might have a different IP address assigned to it.

It is a possibility that for a given domain domain.com does not point to the same place as www.domain.com - in which case standardising on one or the other could have undesirable effects.

The best practice is to use whatever is displayed in the URL bar after you browse to the site.
Alexandre SimõesManager / Technology SpecialistCommented:
From your tags, I believe you're concerned about SEO.
As far as I know, no search engine crawler cares if you're using www, a custom subdomain or even nothing at all.
Most of the ranking scores are linked to how your data is organised and how other sites relate/reference your site.
grnowAuthor Commented:
thanks for the comments..  so there isn't much differences on using either domainA.com or www.domainA.com ? if the website is setup as domainA.com, we can still access the website using www.domainA.com, thus not very sure what differences impact it has between the two.
Alexandre SimõesManager / Technology SpecialistCommented:
Between those two is purely a matter of DNS configuration.
Although most of the times domain.com points to the same as www.domain.com, that is not an imposed configuration.
Actually you can have them pointing to different websites.
I've seen, for instance, people using www.domain.com to point to the website and domain.com to point to the backoffice.
I personally don't do this and prefer to use explicit subdomains but is just a way to show that it's possible.

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