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What is Class-C IP? A group of IP addresses where the first three numbers remain the same and the last one can vary.

Why is it important to know about Class-C IP? Because links from same class-C IP range sites aren’t likely to give same benefit linking to your site, as they would have, if they were on different Class-C IP range.

Here is a cool tool to know if 2 sites have same Class-C IP.