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IPCATV4-DC - Datacenter IPv4 space
Nick Galbreath's IP categorization list. This is a list of IPv4 address that correspond to datacenters, co-location centers, shared and virtual webhosting providers. In other words, ip addresses that end web consumers should not be using.
A connection made from any of these IP addresses can happen not very often and it could mean that the connection is not made by a human but a computer hosted in a datacenter. Hence, it could point to a potential abuser.