January 24th, 2009 | 
Author: Multiple Domain Name Penalty
If you own a web site AND you have multiple domain names registered you might want to read this with your full attention. There are a great many web sites out there which by inappropriate use of multiple domain names effectively cripple their search engine rankings by blatantly breaching search engine guidelines!
Site owners often register more than one domain and there are sound reasons for doing this including; 8211; The main URL includes a keyword phrase but istoo long to type quickly so a shorter cryptic one is utilised and maybe is also used on business cards and letter heads. 8211; You take various versions of domains to prevent competitors from grabbing them 8211; dot.com dot.co.nz dot.biz dot.info etc and point them all to the “main” site. 8211; You take various country versions 8211; dot.co.nz dot.com.au dot.co.uk because you are going to expand into those markets 8211; but in the interim you point them all to the “main” site.
There are also misguided reasons for doing this including; 8211; Having multiple domains pointing to the same location in the hope that the search engines will be duped into indexing ALL of them as different content giving you lots of top rankings under different domains.
Search engines hate duplicated content with a passion8230; but their automated spiders and bots cannot determine which category YOU fall into 8211; uninformed and innocent of intent or deliberately and knowingly manipulative. So all sites who transgress can expect to be treated equally. And yes you can be banned from the SE indexes for getting it wrong!
The search engines do not give out many guidelines 8211; in fact they are all very coy about giving too information much away. However when they do make a statement by way of guidelines regardless of how politely it is worded you had best sit up and take notice because they are really really serious about it!
Google Guidelines on Multiple Domains
In the case of Google their Webmaster Guidelines are unambiguous! E.g. on this page; http://www.google.com/support/webmasters/bin/answer.py?answer=35769 Google are quite clear on this;
Quality Guidelines 8211; Specific Guidelines 8211; Don’t employ cloaking or sneaky redirects. 8211; Don’t create multiple pages subdomains or domains with substantially duplicate content
What This Means to You
There is a clear and present danger in having multiple sites pointing to the same locationif they load exactly the SAME content this is a SERIOUS breach of Google’s Webmaster Guidelines and is expressly FORBIDDEN because the search engines can only interpret this as a blatant attempt to generate duplicate content under different URL’s.Regardless of your actual intentions in this its likely to result in a BAN from search engine indexes. : Not a good start to an online presence right?
Ignorance of The Law is No Excuse
Ignorance of search engine guidelines is not a valid excuse either! Unfortunately many webdesigners and hosting companies are blissfully unaware of thecorrect way to implement multiple domain names. The result is that many web site owners unknowingly jeopardise their site’s inclusion in the search engine rankings.
My advice is that if you have more than one domain name you check how its been set up. If your have two domains; www.domainno1.com and www.domainno2.com and BOTH load the same pages but with the different domains showing then you have a problem. If you can also load the sites as http://domainno1.com and http://domainno2.com then totals 4 different ways of indexing the SAME content!
The Right Way to Do It
That said it IS permitted to have multiple domains pointing to the same content BUT it may only be donevia the use of a Permanent 301 Redirect being applied to the secondary domains e.g. typing inthe URL for any of the secondary domains will redirect you to the main site. This change can easily be implemented at no cost other than a few of minutes of time.
In this example www.domainno2.com is redirected to www.domainno1.com and and neither visitors nor SE spiders ever “see” content under the secondary domain name. The same logic should also be applied to the nonwww versions of both domain names to complete the process and to prevent potential conflicts with the search engines.
About the writer:nbsp;nbsp;Isaac Chu is Project Director of Evinco Solutions Limited. Evinco provides innovative business software include emarketing web solutions email marketing software ecatalog publishing software invoicing software and electronic cheque writer. Visit: http://www.evinco.com.hk
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