Being from country with lot of IPs for operators. I did some packet sniffing on DHCP broadcast traffic seen by my router(ISP should filter that...) and I saw at

Being from country with lot of IPs for operators. I did some packet sniffing on DHCP broadcast traffic seen by my router(ISP should filter that...) and I saw at least 3 non-continuous public IP blocks... And that was just day or less of monitoring this traffic... So if the same connection(plug in wall) can end up with IPs from different blocks, well, trying to do anything sensible with this is too complicated.