C class IPs - very important for back links

Let's start out with the basics.

IP address are classified into 3 class's (groups) depending on the decimal equivalent of the 1st octet in the address as below:
0-255.***.***.*** = all address's
Class A
Intended for a small number of networks that had a large number of computers (hosts) attached. Class A IP Address have a value in the range 1...126 as the first octet. The values 0 and 127 are not available because they have special uses. Class A addresses use the first octet to identify the network which means that 126 addresses are usable, each of which can support 16,777,216 computers (hosts).
Class B
Intended for some networks that had an intermediate number of computers (hosts) attached. Class B IP Addresses have a value in the range 128...191 as the first octet. Class B addresses use the first two octets to identify the network which means that 16,320 addresses are usable, each of which can support 65,536 computers (hosts).

Class C
Intended for a large number of networks that would have a small (relatively) number of computers (hosts) attached. Class C IP Addresses have a value in the range 192...223 as the first octet. Class C addresses use the first three octets to identify the network which means that 2,080,800 addresses (networks) are possible, each of which can support 254 computers (hosts).
Whats the importance of C class IP in SEO?
Search engines don't prefer back links from the same IP addresses .Many new smaller novice hosts firms only mange one single or very few C-classes and therefore makes it difficult to get multiple IPs in different C-classes if you host all your sites the same place. Larger hosts have many C-classes (I believe some even have almost full B-classes but unless you specifically request your various sites to be on different C-class IPs you still could end up on the same. It's usually not something hosts care about (in relation to SEO and linking).Many webmasters started creating hundreds of website on same server and linked each other to increase the sites backlink and google page ranking.
Latest Search Engines like google identified this issue and started avoiding links coming from similar IPs - given its easy to get different D class ips on same server, Search Engines also started avoiding Links from same C Class IP. So whenever any good search engine see that youve a link coming from same C Class IP on which your website is located, the backlink will not have any importance or little importance. Keep in mind that youll not get penalized if youve link coming from same C class IP, but youll not get any advantage either.But Search Engine filters penalize your website if they are:

    *  Hosting websites on I.P addresses in the same C Class
    *  Similar nameservers for websites
    *  Similar WhoIs information for websites
    *  Similar DNS domain for websites

So if you are doing the link exchange specially if you dont have your own server, do check if the person you are linking to has a different C class ip than yours.Multiple C Class IP hosting gives a better backlinking solution. SEO Hosting a new idea ; is all about providing different class C IP address and enable webmasters to host their websites and blogs from separate nameserver on separate class C IP addresses. Multiple class C IPs can really push SEO score of a website to a large extent. Class C IP technique works great enough that there is no scope of its failure. Many good reputable hosting firms have now come up with the new concept of SEO Hosting Plans which do offer a set of Class C IP's to host your
websites and blogs. If your website or portal is hosted on such a SEO Plan then what you need to do is just host a website or a blog like word press on each of unique Class C IP and post good article on regular basis in these blogs with links linking to your target site but all this should not look like spam, articles must be unique with keyword density of up to 10 percent and not more than two links in a post of 250 words.
To make you under stand better the idea of C class ips ,here is an example of same C class IP address for two different webmasters
202.312.168.306
202.312.168.104
Now an example of different C class IP addresses.
292.167.111.243
292.192.222.306