[sam_lowry_]

I should have filtered IP addresses, leaving only ranges before posting. Mea culpa.

IP addresses are blocked in a different context but land on the same list.

Still, to answer your question, dynamic IP addresses can be sticky. Where I operate, some ISPs lease the same IP address for each IP lease renewal. The only way to get an IP address is to wait until the lease expires by e.g. switching off the router.