build blogs across a few different Class-C IP Addresses???

All it really means is different IP addresses (server based).

Host an account at several different hosts and you'll achieve this
or host all sites under one host and buy different IP addresses and
attach each unique IP address to each site.

Jason

Personally, I've only used hostgator or wiredtree other than
having my own servers.

Jason

Alright Thanks Jason!

This has become less important to Google if you're hosting with one of the major hosting companies where there are 1000's of domains on the same class C thanks to advanced server clustering. Given the numbers involved having a small number (less than 50 or so) interlinked won't make any difference to Google in most cases. However, Yahoo and MSN Live do seem to take Class C into account like Google did 6 years or so ago.

I wrote about this recently here: Multiple Class C Hosting | Midas Marketing - Success Tips For Marketers


In reality - there is no such thing as 'class c'.

This is a misconception based on very old IP classifications.

About 10 years ago we went over to CIDR (classless Inter Domain Routing) and the class system stopped.

It was originally started when we were so naive that we thought the IP addresses wouldn't run out - now we know better.

The theory of all this in relation to hosting is that the search engines are too clever for us to fool by putting different sites on one host and linking them for SERPS juice, so if you put them on different IP addresses they won't realise they're all yours and will give you credit for the links.

The 'class' bit goes back to the old days when different companies all had groups of IP addresses, so in general a different class of IP should mean it's a different company.

The other incorrect information about this is that the 3rd number is what defines it as Class C - That's incorrect too.

The ONLY thing that governs the class is the first number - 1-126 is Class A, 129-191 is Class B, 192-223 is Class C, and 224-239 is Class D (Multicasting). (the missing ones are reserved for special uses)

The reason people talk about Class C being the 3rd number is because of a thing called subnet masks. These are what decides which numbers are identifying your network and which ones your computers on that network.

If you setup a PC and put the first digit of your IP address as between 192 and 223 - it will apply a default subnet mask of 255.255.255.0 - This means the last numbers all identify computers - Thus if the 3rd number is different it must belong to a different network.

In the case of SEO people are assuming that this difference will translate into Google (or other search engines) not realising it's your site.

This is also why ebeard mentioned public registrations - Google could easily see that you registered both sites whatever IP addresses they're on.

So in short - it's a techy thing which some of us do just to make sure that the search engines that aren't there yet give us some extra love.

Eventually it won't make any difference as the search engines get better at checking this stuff, and in reality it's not worth worrying about for most people anyway, so don't get too sucked into it.

Andy

If you use a different host you'll almost certainly get a different IP not near your existing ones, but some hosts have more flexibility for this type of thing so just look around.

Unless you're building lots of sites don't worry about it.

There's a few of these "seo" hosts around but you may find it to be more cost effective to buy a few cheap hosting accounts with different providers and then you can do some 3 way linking between the sites.

Andrew