Ok, I have misunderstanding with SEO hosting, what it is?

Did it depends from IP class?
Or this is one more trick with marketing?

It's not necessarily trick marketing, but depending how it's done it can be bundled into blackhat seo.

Basically you are using multiple IPs from various Class C's. You're USUALLY using different servers in different Classes, and then linking those back to a single site (or multiple sites).

Does this work? Yes.

There has been discussions on this and I have seen information that multiple IP addresses not only violate ARIN terms but also prove ineffective for major search engine ranks.

I don't know about ARIN terms, there's no actual requirement AFAIK other than to actually use the IPs you get (or a big chunk of them anyway).

As for the effectiveness of the technique, I doubt that interlinking say 1000 sites is all that hard for an algorithm to notice, with or without different IPs being used.

It really is all about the scale of things.

There's nothing that I've found in ARIN documentation reporting this as a violation. Please post the section of the terms that it violates.

You are using the IP numbers for a site (shared or dedicated IPs). The more links from outside of your network that point back to your site, the more "clout" you have. This is standard link ranking. You should of course build up those other sites so that you have a higher Alexa ranking and then rank them back to you. The higher the rank, the more weight is thrown to your page by the search engines.

The key on all of this is ONE WAY LINKS. You want links pointing TO your site, and very few (if any) pointing OUT.

OK, I understood now. Thanks

Justification isn't defined in negative terms . . . just because they don't have an exhaustive list of everything you SHOULD'NT be using extra ip's for (it would be impossible to compile that list) doesn't mean that everything not listed is a valid form of justification.

That's why you have to justify your allocations in the first place. If there's no good reason why you need the extra ip's for your site to function, you shouldn't be getting extra ip's . . . period.

That's mean a hosting company that offer seo service

I means a hosting company that offer your various Class C's IPs and also give you SEO services. Usually, SEO hosting is quite expensive.

SEO hosting, that mean the web host provider provide SEO services for your web, to increase the traffic on page search engine.

SEO hosting assures you with the Good SEO for your site with the help of different class c IP address, this is a good technique for marketing and SEO

That is why I have sites hosted with 3 different hosting companies that don't even share the same A block of the IP! That way, when I build my main site I can build two supporting sites on other hosting servers and point links to it. One way and no C class IP links... sweet juice!

Justification *IS* needed on dedicated IPs, however that's not what I'm talking about. If you have multiple sites on muliple Class C's you can accomplish this without any problem. You don't necessarily put the different Class C's on the same machine, you have multiple machines or multiple hosting companies that you are involved with.

We currently host on 30 different Class C's. All are justified as we have hundreds of dedicated servers. We can then sell SEO hosting to any number of people as they would have a "mini" site on several different servers using multiple shared accounts on several Class C's.

To the other users regarding expense, it depends on what you call expensive. If $30 is expensive, then maybe it is But if you're concerned about $30, then you're likely not involved in SEO.

It is simply Web hosting with SEO services included in the package.

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Thanks