A static IP is one that will never change. A dynamic IP is exactly that, dynamic. It could change frequently, or not change for more than 1 year. It really depends on how the DHCP server that’s assigns the IPs is set up.
Read more: http://www.whatismyip.com/faq/difference-between-static-ip-address-and-dynamic-ip-address.asp#ixzz3qGecUjlI
