IP address ranges were allocated to various organizations that can declare routes for them onto their own networks, or sell to other parties. This is most comm

IP address ranges were allocated to various organizations that can declare routes for them onto their own networks, or sell to other parties. This is most commonly seen with large clouds like AWS buying millions of IPs from owners that weren't using them. You can use "whowas" to track the ownership shifts, but I don't know of a global index-- each NIC has their own implementation and restrictions. https://www.apnic.net/static/whowas-ui/#1.1.1.1 https://www.apnic.net/static/whowas-ui/#1.1.1.1