It depends. If your ISP needs the address for another customer and you're offline they'll give your old IP to them. If however, they have plenty of addresses in the pool you're likely to get the same address back.
There's also the cases where you're assigned an internal address(10.x.x.x or 172.16.x.x) for example, those are usually regionally assigned or city assigned if the ISP is small and can't afford to buy large numbers of IPv4 or IPv6 addresses, and in turn use NAT. So you could have 250 or 300 people or more on a single IP address and the NAT device routes the traffic - this was very common here in the west in the early days of the net too. But still very common in very poor or remote places.
It depends. If your ISP needs the address for another customer and you're offline they'll give your old IP to them. If however, they have plenty of addresses in the pool you're likely to get the same address back.
There's also the cases where you're assigned an internal address(10.x.x.x or 172.16.x.x) for example, those are usually regionally assigned or city assigned if the ISP is small and can't afford to buy large numbers of IPv4 or IPv6 addresses, and in turn use NAT. So you could have 250 or 300 people or more on a single IP address and the NAT device routes the traffic - this was very common here in the west in the early days of the net too. But still very common in very poor or remote places.