I entered a domain here and I see that they checked the host's netblocks size. What is a netblocks size?
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They are referring to how many IP addresses are in use by the domain. Here is a chart.. https://www.ripe.net/about-us/press-centre/IPv4CIDRChart_2015.pdf
So a /24 block has 255 IP addresses, 253 of those can be assigned to a computer. The remaining 2 are used by gateway and broadcast addresses