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Every device on an IP network needs a unique address. You most likely have a private address at home; reserved IP space not routed externally. Simply, your linksys hides the IP's of your lan behind it's external interface address.
This address can be public or private, it's assigned by your ISP. In some cases your ISP gives your router a private address, so there is NAT happening twice.
Also, your ISP can give you a dynamic (changes) or static (fixed) address. So, when you connect to Pelican Parts to buy car parts you could be coming from the same source or not, depends on how your ISP assigns addresses.
On the back end, IP's can be blocked one at a time or in ranges. It's possible to block an entire ISP's space, but then you are limiting your sales.
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