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IP addresses (C class)
IP addresses are the numerical addresses of computers connected tot he internet. For ease of reading they are broken down into four parts, each called an octet as they contain 8 bits of data
when written in binary form. An example my be 209.85.76.114. in this example the C class is 76 (and everything up to it), so if you have several sites hosted on this IP they would all have identical IP addresses.
If each had a unique IP address that started 209.85.76. then they all share the same C-class IP address. As the allocation of IP addresses within a server environment is usually configured so that each server has it's own C-class; this means that a search engine knows hat all sites on the same C-class IP address are all located on the same server
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