Static proxy mean that the outgoing address ( the address you reach the website with ) fixed and don’t change .as an example proxy 188.8.131.52:1111 , when connect to ip 184.108.40.206 port 1111 the external ip address is 220.127.116.11 .
So if access the website now or after some time , the external ip address is same (18.104.22.168) don’t change .
Rotated proxy usually named as (BC) or Back Connect proxies . like you connect to main Gateway ip and main port like 22.214.171.124:2222 , when the client connect to this proxy and try to access a certian website . the external ip address is not same as the ip address that connected to .
As an example Back connect 126.96.36.199:2222 for 1st request made go outside address 188.8.131.52 , 2nd request 184.108.40.206 , 3rd request 220.127.116.11 and so on . so as you see Back connect proxies has like dynamic pool addresses such as each client make a request , the external is changed .
So based on example above you can consider the Back-connect proxy 18.104.22.168:2222 has a pool of ( 22.214.171.124 , 126.96.36.199 , 188.8.131.52 , ….etc).