seperate C IP BLOCKS what does this mean???

[bewisebets]

i read on one of the posts in this forum that hosting multiple sites with seperate C IP BLOCKS and then interlinking them can help improve your page rank if the sites are all related. Problem is im not sure what a seperate C IP BLOCKS is, can someone help me please?

Also if i had 3 sites hosted on one webhost and payed a little extra for a unique ip, would that work or would i need each site hosted on a seperate web host for this to work?

Also could anybody recommend any good value web hosts in the us as i am from the uk?

Many thanks

[I, Brian]

It's more that Google mentions on a couple of papers, such as Hilltop and LocalRank, about devaluing links that originate within the same C class IP range - which is more properly known these days as a /24 block.

Cross-linking between sites on completely different IP ranges is no guarrantee for ranking purposes, though - Google are well ahead on this, and could potentially use things such as WHOIS registration details and AdSense publisher ID to look for where there is shared ownership of links and therefore devalue them.

[BrianR2]

Hi,

I'm trying to figure out what the definition of a C Class IP range is and, surprisingly, I'm having trouble finding a consistent definition.

One SEO tool at http://www.webrankinfo.com/english/tools/class-c-checker.php?tab_url=foreverfavors.com%0D%0Achococh eer.com that I found for checking C Class IP ranges of domains gives the following results:

URL: chococheer.com / IP Address: 66.235.193.158
URL: foreverfavors.com / IP Address: 66.235.193.158
Class C: 66.235.193

Implying that the C class is the first 3 number blocks of the IP address like A.B.C.D

While, another SEO tool at http://www.webmaster-toolkit.com/class-c-checker.shtml?address1=foreverfavors.com&address2=foreverfavors.com
gives the following results:

The 2 domains are NOT hosted on the same Class C IP range.
foreverfavors.com is hosted on Class A IP 66.235.193.158
foreverfavors.com is hosted on Class A IP 66.235.193.158

According to sites that focus on the syntax of IP addresses outside of an SEO context, the C class has an IP range of 192.0.1.1 to 223.255.254.254. (see: http://www.computerhope.com/jargon/i/ip.htm)

This leaves me wondering: are there 2 different definitions of class C ip ranges and which one is relevant to SEOs? My guess is that the first example is most relevant to SEOs since it involves sites that may be on the same server.

Thanks,
Brian.

[Marcia]

The 2 domains are NOT hosted on the same Class C IP range.
foreverfavors.com is hosted on Class A IP 66.235.193.158
foreverfavors.com is hosted on Class A IP 66.235.193.158Well, it's only one site. Not only is it the same Class C - it's the identical IP number because it's both for the same site.

66.235.193.158
66.235.193.159

Are different IP numbers, same Class C.

[BrianR2]

Yes, I realize that it's the same IP address but I used that as an extreme example to show that, according to the definition of C class IP ranges from some sites, even the same site may not be on the same C class range of IPs as itself because the C class range of IPs is from 192.0.1.1 to 223.255.254.254. Any IP address outside of that range is not on the C class range of IPs at all.

My question more had to do with what the proper definition of a C class IP range is.

[Marcia]

The response that they aren't on the same C class is incorrect. Even if it were 2 different sites on the same IP number - they would still be on the same C class - because they ARE.

That response is confusing and misleading.

[BrianR2]

It's confusing to me too. That's why I asked the question. Turns out some SEO tools are using the old definition of c-class ips making things a little confusing. See http://forums.digitalpoint.com/showthread.php?t=41757 for more clarification. I didn't make this stuff up to confuse people. I got it from other sites and I'm trying to get to the bottom of it for the program that I'm writing to filter out bad links.