In the era of spam, many webmasters started creating multiple website on  same server and linked each other to increase the sites backlink and  ranking. Search Engines 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 when Search Engine see that you’ve a link coming from same C  Class IP on which your website is located, the backlink will not have  any importance.
Please note you’ll not get penalized if you’ve link  coming from same C class IP, but you’ll not get any advantage either. So  if you are doing the link exchange especially if you don’t have your  own server, do check if the person you are linking to has a different C  class ip than yours.
For More Info: Please Read the below mentioned page of Our Brainpulse
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